• Avalanche.Core
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    • Avalanche.Accessor
      • Introduction
      • IAccessor
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    • Avalanche.DataType
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        • IDataType
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      • .Net
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      • Introduction
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    • Avalanche.FileSystem
      • Introduction
      • Abstractions
        • IFileSystem
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    • Avalanche.Identity
      • Introduction
      • Identity
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        • Introduction
        • TypeName
    • Avalanche.Localization
      • Introduction
      • Localization
      • LocalizationFile
      • LocalizationFiles
      • LocalizationFileSystem
      • LocalizationFileFormat
      • LocalizationLine
      • LocalizationLines
      • TemplateFormat
      • CultureProvider
      • FallbackCultureProvider
      • ResourceManager
      • LocalizationError
      • Microsoft.Extensions
        • Introduction
        • DependencyInjection
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        • ITextLocalizer
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        • Localization
      • Asp.Net
        • Introduction
        • Supplying localization
        • Inject to pages
        • Culture Assigned
        • Minimalistic Api
        • Diagnostics
      • Pluralization
        • Introduction
        • Multiple plural parameters
        • Custom PluralRules
        • Invariant Culture
        • Unit Prefix
        • IPluralRule
        • IPluralNumber
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        • CLDRs
        • Unicode.CLDR40
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        • Unicode.CLDR42
      • Articles
        • Alphabet localization
        • Benchmarks
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        • Demo
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        • Embedded resources
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        • File localization
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        • Printing templates
    • Avalanche.Message
      • Introduction
      • IMessage
      • IMessageProvider
      • IMessageDescription
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      • MessageLevel
      • Message printing
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      • Microsoft.Extensions
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    • Avalanche.Service
      • Introduction
      • Service
        • Introduction
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        • Introduction
        • IHandler
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        • ExportAttribute
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        • PrintTree
        • Recursion
      • Query
        • Introduction
        • IQuery
        • IQueryCast
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      • Entry
        • Introduction
        • IEntry
        • IEntryCast
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        • IEntryVisitable
        • EntryState
      • Request
        • Introduction
        • IRequest
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        • RequestAttribute
        • ContextParameterAttribute
        • Print Tree
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        • Introduction
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        • NodeCount
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    • Avalanche.StatusCode
      • Introduction
      • HResult
        • Introduction
        • HResult.Facilities
        • BasicMessages
        • RpcMessages
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        • ItfMessages
        • Win32Messages
        • ClrMessages
      • System
        • Introduction
        • AccessControlMessages
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        • StackMessages
        • TaskMessages
        • TextMessages
        • ThreadingMessages
        • TimeZoneMessages
        • TypeMessages
        • XmlMessages
      • HttpStatusCode
      • OpcUaStatusCode
    • 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
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        • ArrayUtilities
      • Comparers
        • IGraphComparer
        • IGraphComparable
        • AlphaNumericComparer
        • EnumerableComparer
        • EnumerableGraphComparer
        • ReferenceComparer
        • KeyValuePairComparer
        • DefaultComparerProvider
        • RecordComparer
      • Cloners
        • ICloner
        • IGraphCloner
        • IGraphCloneable
        • ListCloner
        • DictionaryCloner
        • FieldCloner
        • PassthroughCloner
        • RecordCloner
        • ClonerProvider
      • Dispose
        • IDisposeAttachable
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      • Provider
        • Introduction
        • ProviderBase
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          • RecordCreate
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        • FieldDelegates
          • FieldRead
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          • 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

    ITemplateFormatPrintable

    ITemplateFormatPrintable prints template texts using a format provider.

    /// <summary>Printable template text. Printing assigns arguments to placeholders.</summary>
    public interface ITemplateFormatPrintable : ITemplatePrintableBase
    {
        /// <summary>Print <paramref name="arguments"/> in placeholders using <paramref name="formatProvider"/>.</summary>
        string Print(IFormatProvider? formatProvider, object?[]? arguments = null);
        /// <summary>Append to <paramref name="sb"/>.</summary>
        void AppendTo(StringBuilder sb, IFormatProvider? formatProvider, object?[]? arguments = null);
        /// <summary>Write to <paramref name="textWriter"/>.</summary>
        void WriteTo(TextWriter textWriter, IFormatProvider? formatProvider, object?[]? arguments = null);
        /// <summary>Try print <paramref name="arguments"/> using <paramref name="formatProvider"/> into <paramref name="dst"/>.</summary>
        /// <param name="length">Number of characters written to <paramref name="dst"/>. If failed, the 0 is returned.</param>
        /// <returns>True if text was written, false if write failed.</returns>
        bool TryPrintTo(Span<char> dst, out int length, IFormatProvider? formatProvider, object?[]? arguments = null);
        /// <summary>Try estimate print length</summary>
        bool TryEstimatePrintLength(out int length, IFormatProvider? formatProvider, object?[]? arguments = null);
    }
    
    /// <summary>Root interface printable template.</summary>
    public interface ITemplatePrintableBase
    {
        /// <summary>Parameters in order of arguments and correspond to arguments and to <see cref="ITemplateParameterPart.ParameterIndex"/>.</summary>
        string?[] ParameterNames { get; set; }
    }
    

    Printing

    .Print(culture, arguments) prints template string by placing arguments into placeholders.

    // Create text without template format
    ITemplateFormatPrintable printable = new TemplateText("Time is {0}.", TemplateFormat.Brace);
    // Create arguments
    object?[] arguments = { DateTime.Now };
    // Print ok
    string print = printable.Print(CultureInfo.CurrentCulture, arguments);
    // ""
    WriteLine(print);
    

    .Print(culture, argumentMap) prints from a dictionary of arguments.

    // Create text without template format
    ITemplateFormatPrintable printable = new TemplateText("Time is {0}.", TemplateFormat.Brace);
    // Create arguments
    IDictionary<string, object?> argumentMap = new Dictionary<string, object?> { { "0", DateTime.Now } };
    // Print ok
    string print = printable.Print(CultureInfo.CurrentCulture, argumentMap);
    // ""
    WriteLine(print);
    

    Printable doesn't expose its inner template string. The implemenation may actually use different template strings, such as a localized or pluralized versions, depending on provided culture and argument values.

    // "You have no apples."
    printable.Print(CultureInfo.GetCultureInfo("en"), new object?[] { 0 });
    // "You have an apple."
    printable.Print(CultureInfo.GetCultureInfo("en"), new object?[] { 1 });
    // "You have 3 apples."
    printable.Print(CultureInfo.GetCultureInfo("en"), new object?[] { 3 });
    // "Sinulla ei ole omenoita."
    printable.Print(CultureInfo.GetCultureInfo("fi"), new object?[] { 0 });
    // "Sinulla on yksi omena."
    printable.Print(CultureInfo.GetCultureInfo("fi"), new object?[] { 1 });
    // "Sinulla on 3 omenaa."
    printable.Print(CultureInfo.GetCultureInfo("fi"), new object?[] { 3 });
    

    .EstimatePrintLength(culture, arguments) counts the number of characters and .PrintTo(span, culture, arg) writes to span. This is zero heap printing.

    // Create template
    ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
    // Create arguments
    object[] arguments = { 3 };
    // Estimate length
    int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, arguments);
    // Allocate span
    Span<char> span = length < 512 ? stackalloc char[length] : new char[length];
    // Print to span
    length = printable.PrintTo(span, CultureInfo.InvariantCulture, arguments);
    // Print to stdout, zero heap.
    Console.Out.Write(span[..length]);
    

    .EstimatePrintLength(culture, argumentMap) estimates length from a dictionary of arguments.

    // Create template
    ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
    // Create arguments
    IDictionary<string, object?> argumentMap = new Dictionary<string, object?> { { "0", 3 } };
    // Estimate length
    int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, argumentMap);
    // Allocate span
    Span<char> span = length < 512 ? stackalloc char[length] : new char[length];
    // Print to span
    length = printable.PrintTo(span, CultureInfo.InvariantCulture, argumentMap);
    // Print to stdout, zero heap.
    Console.Out.Write(span[..length]);
    

    .TryPrintTo(span, culture, arguments) attempts to print without possibility of throwing InvalidOperationException.

    // Create template
    ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
    // Create arguments
    object[] arguments = { 3 };
    // Estimate length
    int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, arguments);
    // Allocate span
    Span<char> span = length < 512 ? stackalloc char[length] : new char[length];
    // Print to span
    if (printable.TryPrintTo(span, out length, CultureInfo.InvariantCulture, arguments))
        Console.Out.Write(span[..length]);
    

    .TryPrintTo(span, culture, argumentMap) attempts to print from a dictionary of arguments.

    // Create template
    ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
    // Create arguments
    IDictionary<string, object?> argumentMap = new Dictionary<string, object?> { { "0", 3 } };
    // Estimate length
    int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, argumentMap);
    // Allocate span
    Span<char> span = length < 512 ? stackalloc char[length] : new char[length];
    // Print to span
    if (printable.TryPrintTo(span, out length, CultureInfo.InvariantCulture, argumentMap))
        Console.Out.Write(span[..length]);
    

    .AppendTo(stringbuilder, culture, arguments) appends to string builder.

    // Create template
    ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
    // Create arguments
    object?[] arguments = { 3 };
    // Create string builder
    StringBuilder sb = new(1024);
    // Append to string builder
    printable.AppendTo(sb, CultureInfo.InvariantCulture, arguments);
    // Print
    WriteLine(sb); // "You have 3 apple(s)."
    

    .AppendTo(stringbuilder, culture, argumentMap) appends from a dictionary of arguments.

    // Create template
    ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
    // Create arguments
    object?[] arguments = { 3 };
    // Create string builder
    StringBuilder sb = new(1024);
    // Append to string builder
    printable.AppendTo(sb, CultureInfo.InvariantCulture, arguments);
    // Print
    WriteLine(sb); // "You have 3 apple(s)."
    

    .WriteTo(textwriter, culture, arguments) writes to text writer.

    // Create template
    ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
    // Create arguments
    object?[] arguments = { 3 };
    // Assign text writer
    TextWriter textWriter = Console.Out;
    // Write to writer
    printable.WriteTo(textWriter, CultureInfo.InvariantCulture, arguments); // "You have 3 apple(s)."
    

    .WriteTo(textwriter, culture, argumentMap) writes from a dictionary of arguments.

    // Create template
    ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
    // Create arguments
    IDictionary<string, object?> argumentMap = new Dictionary<string, object?> { { "0", 3 } };
    // Assign text writer
    TextWriter textWriter = Console.Out;
    // Write to writer
    printable.WriteTo(textWriter, CultureInfo.InvariantCulture, argumentMap); // "You have 3 apple(s)."
    
    Note

    Thanks to C# 10 for Span, stackalloc, ISpanFormattable and MemoryPool which allow zero heap or near zero implementations.

    // Create template
    ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
    // Rent arguments
    object[] arguments = ArrayPool<object>.Shared.Rent(1);
    // Assign argument
    arguments[0] = "3";
    // Estimate length
    int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, arguments);
    // Rent chars
    char[] buffer = ArrayPool<char>.Shared.Rent(length);
    // Print to buffer
    length = printable.PrintTo(buffer.AsSpan(), CultureInfo.InvariantCulture, arguments);
    // Print to stdout, zero heap.
    Console.Out.Write(buffer.AsSpan()[..length]);
    // Return rentals
    ArrayPool<object>.Shared.Return(arguments);
    ArrayPool<char>.Shared.Return(buffer);            
    

    Full Example

    Full example
    using System.Buffers;
    using System.Globalization;
    using System.Text;
    using Avalanche.Template;
    using static System.Console;
    
    public class templateformatprintable
    {
        public static void Run()
        {
            {
                // <03>
                // Create text without template format
                ITemplateFormatPrintable printable = new TemplateText("Time is {0}.", TemplateFormat.Brace);
                // Create arguments
                object?[] arguments = { DateTime.Now };
                // Print ok
                string print = printable.Print(CultureInfo.CurrentCulture, arguments);
                // ""
                WriteLine(print);
                // </03>
            }
            {
                // <03B>
                // Create text without template format
                ITemplateFormatPrintable printable = new TemplateText("Time is {0}.", TemplateFormat.Brace);
                // Create arguments
                IDictionary<string, object?> argumentMap = new Dictionary<string, object?> { { "0", DateTime.Now } };
                // Print ok
                string print = printable.Print(CultureInfo.CurrentCulture, argumentMap);
                // ""
                WriteLine(print);
                // </03B>
            }
            {
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // <04>
                // "You have no apples."
                printable.Print(CultureInfo.GetCultureInfo("en"), new object?[] { 0 });
                // "You have an apple."
                printable.Print(CultureInfo.GetCultureInfo("en"), new object?[] { 1 });
                // "You have 3 apples."
                printable.Print(CultureInfo.GetCultureInfo("en"), new object?[] { 3 });
                // "Sinulla ei ole omenoita."
                printable.Print(CultureInfo.GetCultureInfo("fi"), new object?[] { 0 });
                // "Sinulla on yksi omena."
                printable.Print(CultureInfo.GetCultureInfo("fi"), new object?[] { 1 });
                // "Sinulla on 3 omenaa."
                printable.Print(CultureInfo.GetCultureInfo("fi"), new object?[] { 3 });
                // </04>
            }
    
            {
                // <05>
                // Create template
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // Create arguments
                object[] arguments = { 3 };
                // Estimate length
                int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, arguments);
                // Allocate span
                Span<char> span = length < 512 ? stackalloc char[length] : new char[length];
                // Print to span
                length = printable.PrintTo(span, CultureInfo.InvariantCulture, arguments);
                // Print to stdout, zero heap.
                Console.Out.Write(span[..length]);
                // </05>
                WriteLine();
            }
            {
                // <05B>
                // Create template
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // Create arguments
                IDictionary<string, object?> argumentMap = new Dictionary<string, object?> { { "0", 3 } };
                // Estimate length
                int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, argumentMap);
                // Allocate span
                Span<char> span = length < 512 ? stackalloc char[length] : new char[length];
                // Print to span
                length = printable.PrintTo(span, CultureInfo.InvariantCulture, argumentMap);
                // Print to stdout, zero heap.
                Console.Out.Write(span[..length]);
                // </05B>
                WriteLine();
            }
    
            {
                // <06>
                // Create template
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // Create arguments
                object[] arguments = { 3 };
                // Estimate length
                int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, arguments);
                // Allocate span
                Span<char> span = length < 512 ? stackalloc char[length] : new char[length];
                // Print to span
                if (printable.TryPrintTo(span, out length, CultureInfo.InvariantCulture, arguments))
                    Console.Out.Write(span[..length]);
                // </06>
                WriteLine();
            }
            {
                // <06B>
                // Create template
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // Create arguments
                IDictionary<string, object?> argumentMap = new Dictionary<string, object?> { { "0", 3 } };
                // Estimate length
                int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, argumentMap);
                // Allocate span
                Span<char> span = length < 512 ? stackalloc char[length] : new char[length];
                // Print to span
                if (printable.TryPrintTo(span, out length, CultureInfo.InvariantCulture, argumentMap))
                    Console.Out.Write(span[..length]);
                // </06B>
                WriteLine();
            }
    
            {
                // <11>
                // Create template
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // Create arguments
                object?[] arguments = { 3 };
                // Create string builder
                StringBuilder sb = new(1024);
                // Append to string builder
                printable.AppendTo(sb, CultureInfo.InvariantCulture, arguments);
                // Print
                WriteLine(sb); // "You have 3 apple(s)."
                // </11>
            }
            {
                // <11B>
                // Create template
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // Create arguments
                IDictionary<string, object?> argumentMap = new Dictionary<string, object?> { { "0", 3 } };
                // Create string builder
                StringBuilder sb = new(1024);
                // Append to string builder
                printable.AppendTo(sb, CultureInfo.InvariantCulture, argumentMap);
                // Print
                WriteLine(sb); // "You have 3 apple(s)."
                // </11B>
            }
    
            {
                // <13>
                // Create template
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // Create arguments
                object?[] arguments = { 3 };
                // Assign text writer
                TextWriter textWriter = Console.Out;
                // Write to writer
                printable.WriteTo(textWriter, CultureInfo.InvariantCulture, arguments); // "You have 3 apple(s)."
                // </13>
                WriteLine();
            }
            {
                // <13B>
                // Create template
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // Create arguments
                IDictionary<string, object?> argumentMap = new Dictionary<string, object?> { { "0", 3 } };
                // Assign text writer
                TextWriter textWriter = Console.Out;
                // Write to writer
                printable.WriteTo(textWriter, CultureInfo.InvariantCulture, argumentMap); // "You have 3 apple(s)."
                // </13B>
                WriteLine();
            }
    
            {
                // <20>
                // Create template
                ITemplateFormatPrintable printable = new TemplateText("You have {0} apple(s).", TemplateFormat.Brace);
                // Rent arguments
                object[] arguments = ArrayPool<object>.Shared.Rent(1);
                // Assign argument
                arguments[0] = "3";
                // Estimate length
                int length = printable.EstimatePrintLength(CultureInfo.InvariantCulture, arguments);
                // Rent chars
                char[] buffer = ArrayPool<char>.Shared.Rent(length);
                // Print to buffer
                length = printable.PrintTo(buffer.AsSpan(), CultureInfo.InvariantCulture, arguments);
                // Print to stdout, zero heap.
                Console.Out.Write(buffer.AsSpan()[..length]);
                // Return rentals
                ArrayPool<object>.Shared.Return(arguments);
                ArrayPool<char>.Shared.Return(buffer);            
                // </20>
                WriteLine();
            }
        }
    }
    
    
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