• Avalanche
  • Avalanche.Core
  • Lexical

    Show / Hide Table of Contents
    • Avalanche.Accessor
      • Introduction
      • IAccessor
        • IAccessor
        • IListAccessor
        • IMapAccessor
        • IRecordAccessor
        • IContentAccessor
        • IOneOfAccessor
        • IAnyAccessor
      • .Net
        • Introduction
        • IList<T>
        • IDictionary<K,V>
        • FieldInfo
        • OneOfAttribute
        • StructLayoutAttribute
        • Class
      • Protobuf
        • Introduction
      • Articles
        • Dependency Injection
        • AccessorMessages
    • Avalanche.Binding
      • Introduction
    • Avalanche.Core
      • License
      • Order
    • Avalanche.DataType
      • Introduction
      • DataType
        • IDataType
        • IListType
        • IMapType
        • IRecordType
        • IFieldType
        • IOneOfType
        • IAnyType
        • IStringType
        • IValueType
        • IIntegerType
        • IEnumerationType
        • IRealType
      • .Net
        • Introduction
        • IList<T>
        • IDictionary<K,V>
        • FieldInfo
        • Enum
        • OneOfAttribute
        • StructLayoutAttribute
        • Class
      • Protobuf
        • Introduction
      • Articles
        • DataTypeRequest
        • PrintTree
        • DataTypeMessages
    • Avalanche.Emit
      • Introduction
      • TypeBuilder
      • ConstructorBuilder
      • MethodBuilder
      • PropertyBuilder
      • FieldBuilder
      • Emit
      • Utilities
    • Avalanche.FileSystem
      • Introduction
      • Abstractions
        • IFileSystem
          • IFileSystemBrowse
          • IFileSystemCreateDirectory
          • IFileSystemDelete
          • IFileSystemFileAttribute
          • IFileSystemMount
          • IFileSystemMove
          • IFileSystemObserve
          • IFileSystemOpen
        • IEvent
        • IEntry
        • IOption
        • IToken
      • FileSystem
      • VirtualFileSystem
      • MemoryFileSystem
      • EmbeddedFileSystem
      • HttpFileSystem
      • Decoration
      • IFileProvider
      • Events
      • Utilities
        • Dispose
        • File Scanner
        • Visit Tree
        • File Operation
    • Avalanche.Identity
      • Introduction
      • Identity
      • IdentityParts
      • IdentityInterner
      • IdentityComparer
      • Print Tree
      • IdentityAccessors
        • Introduction
        • TypeName
    • Avalanche.Localization
      • Introduction
      • Localization
      • LocalizationFile
      • LocalizationFiles
      • LocalizationFileSystem
      • LocalizationFileFormat
      • LocalizationLine
      • LocalizationLines
      • TemplateFormat
      • CultureProvider
      • FallbackCultureProvider
      • ResourceManager
      • LocalizationError
      • Microsoft.Extensions
        • Introduction
        • DependencyInjection
        • FileProvider
        • Logging
        • ITextLocalizer
        • IFileLocalizer
        • Localization
        • Asp.Net
        • Asp.Net (Min Api)
      • Pluralization
        • Introduction
        • Multiple plural parameters
        • Custom PluralRules
        • Invariant Culture
        • Unit Prefix
        • IPluralRule
        • IPluralNumber
        • IPluralRules
        • CLDRs
        • Unicode.CLDR41
        • Unicode.CLDR40
      • Articles
        • Alphabet localization
        • Benchmarks
        • Caching
        • Class Library
        • Demo
        • Diagnostics
        • Embedded resources
        • Emplacement
        • File localization
        • Text localization
    • Avalanche.Message
      • Introduction
      • IMessage
      • IMessageProvider
      • IMessageDescription
      • IMessageDescriptions
      • MessageLevel
      • Message printing
      • Messages and Exceptions
      • Logging
      • Validation
      • Localization
    • Avalanche.Service
      • Introduction
      • Service
        • Introduction
        • IService
        • IServiceDisposable
        • IServiceDecoration
        • IServiceCast
        • IServiceObservable
        • IServiceContainer
        • Construction
        • Query
        • CancellationToken
        • CachePolicy
        • Scope
      • Handler
        • Introduction
        • IHandler
        • IHandlerCast
        • IHandlerDecoration
        • IHandlerWithOrder
        • CancellationToken
        • Cyclicity
        • Delegates
        • Invokable
        • ExportAttribute
        • OrderAttribute
        • PrintTree
        • Recursion
      • Query
        • Introduction
        • IQuery
        • IQueryCast
        • IQueryDecoration
      • Entry
        • Introduction
        • IEntry
        • IEntryCast
        • IEntryDecoration
        • IEntryObservable
        • IEntryVisitable
        • EntryState
      • Request
        • Introduction
        • IRequest
        • IRequestFor
        • IRequestToBeCached
        • IRequestToBeDisposed
        • RequestAttribute
        • ContextParameterAttribute
        • Print Tree
      • Dependency Injection
        • Introduction
        • Asp.Net
        • ServiceRequest<T>
        • Decorating a service
        • Handler
        • CachePolicy
        • CancellationToken
        • QueryLogger
      • Examples
        • NodeCount
        • Expression
        • Mapper
      • Articles
        • Benchmarks
        • Error Handling
        • ServiceMessages
    • Avalanche.StatusCode
      • Introduction
      • HResult
        • Introduction
        • HResult.Facilities
        • BasicMessages
        • RpcMessages
        • DispatchMessages
        • ItfMessages
        • Win32Messages
        • ClrMessages
      • System
        • Introduction
        • AccessControlMessages
        • AggregateMessages
        • AppDomainMessages
        • ArgumentMessages
        • ArgumentNullMessages
        • ArgumentOutOfRangeMessages
        • ArithmeticMessages
        • ArrayMessages
        • AssemblyMessages
        • BadImageFormatMessages
        • CodeContractMessages
        • CodePageMessages
        • CollectionsMessages
        • CompilerServiceMessages
        • CryptographyMessages
        • CultureMessages
        • DiagnosticsMessages
        • EventSourceMessages
        • ExecutionEngineMessages
        • FormatMessages
        • HostProtectionMessages
        • IOMessages
        • IndexOutOfRangeMessages
        • InteropServiceMessages
        • InvalidCastMessages
        • InvalidOperationMessages
        • IsolatedStorageMessages
        • LazyMessages
        • MarshalerMessages
        • MemoryMessages
        • MiscellaneousMessages
        • NotImplementedMessages
        • NotSupportedMessages
        • ObjectDisposedMessages
        • OperationCanceledMessages
        • OverflowMessages
        • PlatformMessages
        • PolicyMessages
        • PrincipalMessages
        • ProgramMessages
        • ReferenceMessages
        • ReflectionMessages
        • RegionMessages
        • RemotingMessages
        • ResourcesMessages
        • SecurityMessages
        • SerializationMessages
        • StackMessages
        • TaskMessages
        • TextMessages
        • ThreadingMessages
        • TimeZoneMessages
        • TypeMessages
        • XmlMessages
    • Avalanche.Template
      • Introduction
      • TemplateFormats
      • ITemplatePrintable
      • ITemplateFormatPrintable
      • ITemplateText
      • ITemplateBreakdown
      • ITemplateFormat
      • ITemplateFormats
      • Extract Arguments
      • Emplacement
    • Avalanche.Tokenizer
      • Introduction
      • IToken
      • ITokenizer
      • Tokenizers
    • Avalanche.Utilities
      • Introduction
      • Collections
        • Tuples
        • StructList
        • ArrayList
        • BijectionMap
        • LocakableDictionary
        • LockableList
        • MapList
        • Pipe
        • RingQueue
        • EnumerableExtensions
        • TupleUtilities
        • ArrayUtilities
      • Comparers
        • IGraphComparer
        • IGraphComparable
        • AlphaNumericComparer
        • EnumerableComparer
        • EnumerableGraphComparer
        • ReferenceComparer
        • KeyValuePairComparer
        • DefaultComparerProvider
        • RecordComparer
      • Cloners
        • ICloner
        • IGraphCloner
        • IGraphCloneable
        • ListCloner
        • DictionaryCloner
        • FieldCloner
        • PassthroughCloner
        • RecordCloner
        • ClonerProvider
      • Dispose
        • IDisposeAttachable
        • IDisposeBelatable
      • Provider
        • Introduction
        • ProviderBase
        • Delegate
        • Pipe
        • Cache
        • ResultCapture
        • AsReadOnly
        • AsService
        • IProviderEvent
      • Record
        • IRecordDescription
        • IFieldDescription
        • IConstructorDescription
        • IConstructionDescription
        • IParameterDescription
        • IRecordProviders
        • RecordDelegates
          • RecordCreate
          • RecordClone
          • RecordCopy
          • IRecordDelegates
        • FieldDelegates
          • FieldRead
          • FieldWrite
          • RecreateWith
          • IFieldDelegates
      • String
        • IEscaper
        • UnicodeString
      • Miscellaneous
        • IIdGenerator
        • Permutation
        • IReadOnly
        • IUserDataContainer
        • Void
    • Avalanche.Writer
      • Introduction
      • ConstantWriter
      • Context
      • ConvertWriter
      • DefaultConstructor
      • DelegateWriter
      • PassthroughWriter
      • Referer
      • TypeCast
      • Writer
      • WriterPipe
      • WriterMessages

    FieldInfo

    AccessorRequest<NetField> requests for a field accessor of FieldInfo or PropertyInfo. (Avalanche.Accessor.Net.dll)

    // Create description
    FieldInfo fi = typeof(MyClass).GetField("Id")!;
    // Create request
    AccessorRequest request = new AccessorRequest(new NetField(fi));
    // Create accessor
    IContentAccessor<MyClass, int> idAccessor = Services.Create(NetAccessorHandlers.Instance).GetRequired<IRequest, IContentAccessor<MyClass, int>>(request);
    

    ContentAccessorRequest(IFieldDescription) also request for IContentAccessor<Container, Content>. FieldInfo, PropertyInfo, MethodInfo, ParameterInfo, and IEnumerable<EmitLine> can be used to describe .Reader, .Writer and .Referer.

    // Create description
    FieldInfo fi = typeof(MyClass).GetField("Id")!;
    IFieldDescription fieldDescription =
        new FieldDescription()
        .SetName("Id")
        .SetType(typeof(int))
        .SetReader(fi)
        .SetWriter(fi)
        .SetReferer(fi)
        .SetReadOnly();
    
    // Create request
    ContentAccessorRequest request = new ContentAccessorRequest(new NetField(fieldDescription));
    // Create accessor
    IContentAccessor<MyClass, int> idAccessor =
        Services.Create(NetAccessorHandlers.Instance).GetRequired<ContentAccessorRequest, IContentAccessor<MyClass, int>>(request);
    

    ContentAccessorRequest(target, contentType) requests for specific ContentType.

    // Create container target
    IContainerTarget target = new NetField(typeof(MyClass).GetField("Id")!, typeof(object));
    // Create request
    ContentAccessorRequest request = new ContentAccessorRequest(target);
    // Create accessor
    IContentAccessor<MyClass, object> idAccessor =
        Services.Create(NetAccessorHandlers.Instance).GetRequired<ContentAccessorRequest, IContentAccessor<MyClass, object>>(request);
    

    FieldDescriptionRequest(Target) requests a field description for FieldInfo, PropertyInfo, MethodInfo, ParameterInfo, and IEnumerable<EmitLine>.

    // Get target
    FieldInfo fi = typeof(MyClass).GetField("Id")!;
    // Create description request
    IRequestFor<IFieldDescription> fieldDescriptionRequest = new FieldDescriptionRequest(fi);
    // Create request
    IRequestFor<IContentAccessor> fieldAccessorRequest = new ContentAccessorRequest(new NetField(fieldDescriptionRequest));
    // Create accessor
    IContentAccessor<MyClass, int> idAccessor = Services.Create(NetAccessorHandlers.Instance).GetRequired<IRequestFor<IContentAccessor>, IContentAccessor<MyClass, int>>(fieldAccessorRequest);
    

    Usage

    .Reader reads the value from the field.

    MyClass myRecord = new MyClass(50, "ABC");
    int id = idAccessor.Reader.Read(myRecord);
    

    .Writer writes value to field.

    MyClass myRecord = new MyClass(50, "ABC");
    idAccessor.Writer.Write(10, myRecord);
    

    .Referer gets a pointer to field.

    IReferer<MyClass, int> referer1 = new MyClassIdReferer(); 
    MyClass myRecord = new MyClass(50, "ABC");
    ref int pointer = ref referer1.GetReference(myRecord);
    
    IRefererFromRef<MyStruct, int> referer2 = new MyStructIdReferer();
    MyStruct myStruct = new MyStruct(7, "");
    ref int id2 = ref referer2.GetReference(ref myStruct);
    

    Implementation

    The default implementations work for most cases, however, more specific custom implementations can be crafted.

    Reader

    public class MyClass
    {
        public int Id;
        public string Label;
    
        public MyClass(int id, string label)
        {
            Id = id;
            Label = label;
        }
    }
    
    public struct MyStruct
    {
        public int Id;
        public string Label;
    
        public MyStruct(int id, string label)
        {
            Id = id;
            Label = label;
        }
    }
    

    Reader can be created with delegate.

    var myClassIdReader = DelegateWriter.Reader((MyClass record) => record.Id);
    var myStructIdReader = DelegateWriter.Reader((MyStruct record) => record.Id);
    

    Reader can be created with base class.

    /// <summary></summary>
    public class MyClassIdReader : WriterToRef<MyClass, int>
    {
        /// <summary></summary>
        public override bool TryWrite(MyClass from, ref int to, IServiceProvider? context = null)
        {
            if (from == null) return false;
            to = from.Id;
            return true;
        }
    }
    
    /// <summary></summary>
    public class MyStructIdReader : WriterToRef<MyStruct, int>
    {
        /// <summary></summary>
        public override bool TryWrite(MyStruct from, ref int to, IServiceProvider? context = null)
        {
            to = from.Id;
            return true;
        }
    }
    

    Handler processes ReaderRequest.

    // Create service
    IService service = Services.Create((NetAccessorHandlers.Instance, new MyClassIdReaderBuilder()), CachePolicies.Default);
    // Create field description
    IFieldDescription fieldDescription = new FieldDescription().Read(typeof(MyClass).GetField("Id")!).SetReadOnly();
    // Reader request
    ReaderRequest request = new ReaderRequest(new NetField(fieldDescription));
    // Get reader
    IWriterBase<MyClass, int> myClassIdReader = service.GetRequired<ReaderRequest, IWriterBase<MyClass, int>>(request);
    // Create class
    MyClass myClass = new MyClass(6, "");
    // Read
    int id = myClassIdReader.Read(myClass);
    
    public class MyClassIdReaderBuilder : IHandler<ReaderRequest, IWriterBase>
    {
        [Order(-100)]
        public void Handle(IQuery<ReaderRequest, IWriterBase> query)
        {
            // Already handled
            if (query.Handled()) return;
            // Place here field description
            IFieldDescription fieldDescription;
            // Get field description
            if (query.Request.Target is INetField netFieldType && netFieldType.ContainerType is IFieldDescription fieldDescription1) fieldDescription = fieldDescription1;
            else if (query.Request.Target is INetType netType && netType.ContainerType is IFieldDescription fieldDescription2) fieldDescription = fieldDescription2;
            else if (query.Request.Target is IFieldDescription fieldDescription3) fieldDescription = fieldDescription3;
            else return;
            // Get record type
            Type recordType = fieldDescription.Record?.Type ?? (fieldDescription.Reader as MemberInfo)?.DeclaringType!;
            // This handler only handles "MyClass"
            if (!typeof(MyClass).Equals(recordType)) return;
            //
            if (!"Id".Equals(fieldDescription.Name?.ToString())) return;
            // Create reader
            IWriterBase reader = new MyClassIdReader();
            // Decorate IWriterBase<object, object> support
            reader = WriterAdapter.Create(reader);
            // Assign reader
            query.Response.SetValue(reader);
    
        }
    }
    

    Writer

    Writer can be created with delegate.

    var myClassIdWriter = DelegateWriter.Writer((int value, MyClass record) => record.Id = value);
    var myStructIdWriter = DelegateWriter.Writer((int value, ref MyStruct record) => record.Id = value);
    

    Writer can be created with base class.

    /// <summary></summary>
    public class MyClassIdWriter : Writer<int, MyClass>
    {
        /// <summary></summary>
        public override bool TryWrite(int value, MyClass to, IServiceProvider? context = null)
        {
            if (to == null) return false;
            to.Id = value;
            return true;
        }
    }
    
    /// <summary></summary>
    public class MyStructIdWriter : WriterToRef<int, MyStruct>
    {
        /// <summary></summary>
        public override bool TryWrite(int value, ref MyStruct to, IServiceProvider? context = null)
        {
            to.Id = value;
            return true;
        }
    }
    

    Handler processes WriterRequest.

    // Create service
    IService service = Services.Create((NetAccessorHandlers.Instance, new MyClassIdWriterBuilder()), CachePolicies.Default);
    // Create field description
    IFieldDescription fieldDescription = new FieldDescription().Read(typeof(MyClass).GetField("Id")!).SetReadOnly();
    // Writer request
    WriterRequest request = new WriterRequest(new NetField(fieldDescription));
    // Get writer
    IWriter<int, MyClass> myClassIdWriter = service.GetRequired<WriterRequest, IWriter<int, MyClass>>(request);
    // Create class
    MyClass myClass = new MyClass(6, "");
    // Write
    myClassIdWriter.Write(2023, myClass);
    
    public class MyClassIdWriterBuilder : IHandler<WriterRequest, IWriterBase>
    {
        [Order(-100)]
        public void Handle(IQuery<WriterRequest, IWriterBase> query)
        {
            // Already handled
            if (query.Handled()) return;
    
            // 
            if (query.Request.Target is not IFieldDescription fieldDescription) return;
            // Get record type
            Type recordType = fieldDescription.Record?.Type ?? (fieldDescription.Writer as MemberInfo)?.DeclaringType!;
            // This handler only handles "MyClass"
            if (!typeof(MyClass).Equals(recordType)) return;
            //
            if (!"Id".Equals(fieldDescription.Name?.ToString())) return;
            // Create writer
            IWriterBase writer = new MyClassIdWriter();
            // Decorate IWriterBase<object, object> support
            writer = WriterAdapter.Create(writer);
            // Assign writer
            query.Response.SetValue(writer);
    
        }
    }
    

    Referer

    Referer can be created with base class.

    /// <summary></summary>
    public class MyClassIdReferer : IReferer<MyClass, int>
    {
        public bool CanRefer => true;
        public Type FromType => typeof(MyClass);
        public Type ToType => typeof(int);
        public ref int GetReference(MyClass record, IServiceProvider? context = null) => ref record.Id;
        public bool Accept(IWriterBaseVisitor visitor) => visitor is not IRefererVisitor v ? true : v.Visit(refererT: this);
    }
    
    /// <summary></summary>
    public class MyStructIdReferer : IRefererFromRef<MyStruct, int>
    {
        public bool CanRefer => true;
        public Type FromType => typeof(MyStruct);
        public Type ToType => typeof(int);
        public ref int GetReference(ref MyStruct record, IServiceProvider? context = null) => ref record.Id;
        public bool Accept(IWriterBaseVisitor visitor) => visitor is not IRefererVisitor v ? true : v.Visit(refererTFR: this);
    }
    

    Handler processes RefererRequest.

    // Create service
    IService service = Services.Create((NetAccessorHandlers.Instance, new MyClassIdRefererBuilder()), CachePolicies.Default);
    // Create field description
    IFieldDescription fieldDescription = new FieldDescription().Read(typeof(MyClass).GetField("Id")!).SetReadOnly();
    // Referer request
    RefererRequest request = new RefererRequest(new NetField(fieldDescription));
    // Get referer
    IReferer<MyClass, int> myClassIdReferer = service.GetRequired<RefererRequest, IReferer<MyClass, int>>(request);
    // Create class
    MyClass myClass = new MyClass(6, "");
    // Read
    ref int id = ref myClassIdReferer.GetReference(myClass);
    
    public class MyClassIdRefererBuilder : IHandler<RefererRequest, IWriterBase>
    {
        [Order(-100)]
        public void Handle(IQuery<RefererRequest, IWriterBase> query)
        {
            // Already handled
            if (query.Handled()) return;
    
            // 
            if (query.Request.Target is not IFieldDescription fieldDescription) return;
            // Get record type
            Type recordType = fieldDescription.Record?.Type ?? (fieldDescription.Referer as MemberInfo)?.DeclaringType!;
            // This handler only handles "MyClass"
            if (!typeof(MyClass).Equals(recordType)) return;
            //
            if (!"Id".Equals(fieldDescription.Name?.ToString())) return;
            // Create referer
            IWriterBase referer = new MyClassIdReferer();
            // Assign referer
            query.Response.SetValue(referer);
        }
    }
    

    Full Example

    Full example
    using System;
    using System.Reflection;
    using System.Runtime.Serialization;
    using Avalanche.Accessor;
    using Avalanche.DataType;
    using Avalanche.Service;
    using Avalanche.Utilities;
    using Avalanche.Utilities.Record;
    using Avalanche.Writer;
    
    public class field
    {
        public static void Run()
        {
            {
                // <10>
                // Create description
                FieldInfo fi = typeof(MyClass).GetField("Id")!;
                // Create request
                AccessorRequest request = new AccessorRequest(new NetField(fi));
                // Create accessor
                IContentAccessor<MyClass, int> idAccessor = Services.Create(NetAccessorHandlers.Instance).GetRequired<IRequest, IContentAccessor<MyClass, int>>(request);
                // </10>
            }        
            {
                // <11>
                // Create description
                FieldInfo fi = typeof(MyClass).GetField("Id")!;
                IFieldDescription fieldDescription =
                    new FieldDescription()
                    .SetName("Id")
                    .SetType(typeof(int))
                    .SetReader(fi)
                    .SetWriter(fi)
                    .SetReferer(fi)
                    .SetReadOnly();
    
                // Create request
                ContentAccessorRequest request = new ContentAccessorRequest(new NetField(fieldDescription));
                // Create accessor
                IContentAccessor<MyClass, int> idAccessor =
                    Services.Create(NetAccessorHandlers.Instance).GetRequired<ContentAccessorRequest, IContentAccessor<MyClass, int>>(request);
                // </11>
            }
            {
                // <11B>
                // Create container target
                IContainerTarget target = new NetField(typeof(MyClass).GetField("Id")!, typeof(object));
                // Create request
                ContentAccessorRequest request = new ContentAccessorRequest(target);
                // Create accessor
                IContentAccessor<MyClass, object> idAccessor =
                    Services.Create(NetAccessorHandlers.Instance).GetRequired<ContentAccessorRequest, IContentAccessor<MyClass, object>>(request);
                // </11B>
            }
            {
                // <12>
                // Get target
                FieldInfo fi = typeof(MyClass).GetField("Id")!;
                // Create description request
                IRequestFor<IFieldDescription> fieldDescriptionRequest = new FieldDescriptionRequest(fi);
                // Create request
                IRequestFor<IContentAccessor> fieldAccessorRequest = new ContentAccessorRequest(new NetField(fieldDescriptionRequest));
                // Create accessor
                IContentAccessor<MyClass, int> idAccessor = Services.Create(NetAccessorHandlers.Instance).GetRequired<IRequestFor<IContentAccessor>, IContentAccessor<MyClass, int>>(fieldAccessorRequest);
                // </12>
    
                {
                    // <51>
                    MyClass myRecord = new MyClass(50, "ABC");
                    int id = idAccessor.Reader.Read(myRecord);
                    // </51>
                }
                {
                    // <51E>
                    var myClassIdReader = DelegateWriter.Reader((MyClass record) => record.Id);
                    var myStructIdReader = DelegateWriter.Reader((MyStruct record) => record.Id);
                    // </51E>
                }
                {
                    // <51H>
                    // Create service
                    IService service = Services.Create((NetAccessorHandlers.Instance, new MyClassIdReaderBuilder()), CachePolicies.Default);
                    // Create field description
                    IFieldDescription fieldDescription = new FieldDescription().Read(typeof(MyClass).GetField("Id")!).SetReadOnly();
                    // Reader request
                    ReaderRequest request = new ReaderRequest(new NetField(fieldDescription));
                    // Get reader
                    IWriterBase<MyClass, int> myClassIdReader = service.GetRequired<ReaderRequest, IWriterBase<MyClass, int>>(request);
                    // Create class
                    MyClass myClass = new MyClass(6, "");
                    // Read
                    int id = myClassIdReader.Read(myClass);
                    // </51H>
                }
    
                {
                    // <52>
                    MyClass myRecord = new MyClass(50, "ABC");
                    idAccessor.Writer.Write(10, myRecord);
                    // </52>
                }
                {
                    // <52E>
                    var myClassIdWriter = DelegateWriter.Writer((int value, MyClass record) => record.Id = value);
                    var myStructIdWriter = DelegateWriter.Writer((int value, ref MyStruct record) => record.Id = value);
                    // </52E>
                }
                {
                    // <52H>
                    // Create service
                    IService service = Services.Create((NetAccessorHandlers.Instance, new MyClassIdWriterBuilder()), CachePolicies.Default);
                    // Create field description
                    IFieldDescription fieldDescription = new FieldDescription().Read(typeof(MyClass).GetField("Id")!).SetReadOnly();
                    // Writer request
                    WriterRequest request = new WriterRequest(new NetField(fieldDescription));
                    // Get writer
                    IWriter<int, MyClass> myClassIdWriter = service.GetRequired<WriterRequest, IWriter<int, MyClass>>(request);
                    // Create class
                    MyClass myClass = new MyClass(6, "");
                    // Write
                    myClassIdWriter.Write(2023, myClass);
                    // </52H>
                }
    
    
                {
                    // <53>
                    IReferer<MyClass, int> referer1 = new MyClassIdReferer(); 
                    MyClass myRecord = new MyClass(50, "ABC");
                    ref int pointer = ref referer1.GetReference(myRecord);
    
                    IRefererFromRef<MyStruct, int> referer2 = new MyStructIdReferer();
                    MyStruct myStruct = new MyStruct(7, "");
                    ref int id2 = ref referer2.GetReference(ref myStruct);
                    // </53>
                }
                {
                    // <53H>
                    // Create service
                    IService service = Services.Create((NetAccessorHandlers.Instance, new MyClassIdRefererBuilder()), CachePolicies.Default);
                    // Create field description
                    IFieldDescription fieldDescription = new FieldDescription().Read(typeof(MyClass).GetField("Id")!).SetReadOnly();
                    // Referer request
                    RefererRequest request = new RefererRequest(new NetField(fieldDescription));
                    // Get referer
                    IReferer<MyClass, int> myClassIdReferer = service.GetRequired<RefererRequest, IReferer<MyClass, int>>(request);
                    // Create class
                    MyClass myClass = new MyClass(6, "");
                    // Read
                    ref int id = ref myClassIdReferer.GetReference(myClass);
                    // </53H>
                }
            }
        }
    
        // <100>
        public class MyClass
        {
            public int Id;
            public string Label;
    
            public MyClass(int id, string label)
            {
                Id = id;
                Label = label;
            }
        }
    
        public struct MyStruct
        {
            public int Id;
            public string Label;
    
            public MyStruct(int id, string label)
            {
                Id = id;
                Label = label;
            }
        }
        // </100>
    
        // <51F>
        /// <summary></summary>
        public class MyClassIdReader : WriterToRef<MyClass, int>
        {
            /// <summary></summary>
            public override bool TryWrite(MyClass from, ref int to, IServiceProvider? context = null)
            {
                if (from == null) return false;
                to = from.Id;
                return true;
            }
        }
    
        /// <summary></summary>
        public class MyStructIdReader : WriterToRef<MyStruct, int>
        {
            /// <summary></summary>
            public override bool TryWrite(MyStruct from, ref int to, IServiceProvider? context = null)
            {
                to = from.Id;
                return true;
            }
        }
        // </51F>
        // <51G>
        public class MyClassIdReaderBuilder : IHandler<ReaderRequest, IWriterBase>
        {
            [Order(-100)]
            public void Handle(IQuery<ReaderRequest, IWriterBase> query)
            {
                // Already handled
                if (query.Handled()) return;
                // Place here field description
                IFieldDescription fieldDescription;
                // Get field description
                if (query.Request.Target is INetField netFieldType && netFieldType.ContainerType is IFieldDescription fieldDescription1) fieldDescription = fieldDescription1;
                else if (query.Request.Target is INetType netType && netType.ContainerType is IFieldDescription fieldDescription2) fieldDescription = fieldDescription2;
                else if (query.Request.Target is IFieldDescription fieldDescription3) fieldDescription = fieldDescription3;
                else return;
                // Get record type
                Type recordType = fieldDescription.Record?.Type ?? (fieldDescription.Reader as MemberInfo)?.DeclaringType!;
                // This handler only handles "MyClass"
                if (!typeof(MyClass).Equals(recordType)) return;
                //
                if (!"Id".Equals(fieldDescription.Name?.ToString())) return;
                // Create reader
                IWriterBase reader = new MyClassIdReader();
                // Decorate IWriterBase<object, object> support
                reader = WriterAdapter.Create(reader);
                // Assign reader
                query.Response.SetValue(reader);
    
            }
        }
        // </51G>
    
    
        // <52F>
        /// <summary></summary>
        public class MyClassIdWriter : Writer<int, MyClass>
        {
            /// <summary></summary>
            public override bool TryWrite(int value, MyClass to, IServiceProvider? context = null)
            {
                if (to == null) return false;
                to.Id = value;
                return true;
            }
        }
    
        /// <summary></summary>
        public class MyStructIdWriter : WriterToRef<int, MyStruct>
        {
            /// <summary></summary>
            public override bool TryWrite(int value, ref MyStruct to, IServiceProvider? context = null)
            {
                to.Id = value;
                return true;
            }
        }
        // </52F>
        // <52G>
        public class MyClassIdWriterBuilder : IHandler<WriterRequest, IWriterBase>
        {
            [Order(-100)]
            public void Handle(IQuery<WriterRequest, IWriterBase> query)
            {
                // Already handled
                if (query.Handled()) return;
    
                // 
                if (query.Request.Target is not IFieldDescription fieldDescription) return;
                // Get record type
                Type recordType = fieldDescription.Record?.Type ?? (fieldDescription.Writer as MemberInfo)?.DeclaringType!;
                // This handler only handles "MyClass"
                if (!typeof(MyClass).Equals(recordType)) return;
                //
                if (!"Id".Equals(fieldDescription.Name?.ToString())) return;
                // Create writer
                IWriterBase writer = new MyClassIdWriter();
                // Decorate IWriterBase<object, object> support
                writer = WriterAdapter.Create(writer);
                // Assign writer
                query.Response.SetValue(writer);
    
            }
        }
        // </52G>
    
        // <53F>
        /// <summary></summary>
        public class MyClassIdReferer : IReferer<MyClass, int>
        {
            public bool CanRefer => true;
            public Type FromType => typeof(MyClass);
            public Type ToType => typeof(int);
            public ref int GetReference(MyClass record, IServiceProvider? context = null) => ref record.Id;
            public bool Accept(IWriterBaseVisitor visitor) => visitor is not IRefererVisitor v ? true : v.Visit(refererT: this);
        }
    
        /// <summary></summary>
        public class MyStructIdReferer : IRefererFromRef<MyStruct, int>
        {
            public bool CanRefer => true;
            public Type FromType => typeof(MyStruct);
            public Type ToType => typeof(int);
            public ref int GetReference(ref MyStruct record, IServiceProvider? context = null) => ref record.Id;
            public bool Accept(IWriterBaseVisitor visitor) => visitor is not IRefererVisitor v ? true : v.Visit(refererTFR: this);
        }
        // </53F>
        // <53G>
        public class MyClassIdRefererBuilder : IHandler<RefererRequest, IWriterBase>
        {
            [Order(-100)]
            public void Handle(IQuery<RefererRequest, IWriterBase> query)
            {
                // Already handled
                if (query.Handled()) return;
    
                // 
                if (query.Request.Target is not IFieldDescription fieldDescription) return;
                // Get record type
                Type recordType = fieldDescription.Record?.Type ?? (fieldDescription.Referer as MemberInfo)?.DeclaringType!;
                // This handler only handles "MyClass"
                if (!typeof(MyClass).Equals(recordType)) return;
                //
                if (!"Id".Equals(fieldDescription.Name?.ToString())) return;
                // Create referer
                IWriterBase referer = new MyClassIdReferer();
                // Assign referer
                query.Response.SetValue(referer);
            }
        }
        // </53G>
    
    }
    
    Back to top Copyright © 2022 Toni Kalajainen, contact@avalanche.fi