CultureContext

Third parameter of IWriter passes execution contextual information as IServiceProvider.

CultureContext is a simple implementation that carries formatString, FormatArgument and IFormatProvider.

// Create parser
IWriterBase<string, DateTime> dateParser = new DateParser();
// Create cultures
CultureInfo fi = new CultureInfo("fi-FI");
CultureInfo en = new CultureInfo("en");
// Create context
IServiceProvider fiContext = new FormatArgument() { FormatProvider = fi };
IServiceProvider enContext = new FormatArgument() { FormatProvider = en };
// Create date
DateTime date = new DateTime(2020, 1, 1, 1, 1, 1);
// Print Date
string date_fi = date.ToString(fi);
string date_en = date.ToString(en);
WriteLine(date_fi); // "1.1.2020 1.01.01"
WriteLine(date_en); // "1/1/2020 1:01:01 AM"
// Parse date
DateTime date_from_fi_string = dateParser.Read(date_fi, fiContext);
DateTime date_from_en_string = dateParser.Read(date_en, enContext);
WriteLine(date_from_fi_string);
WriteLine(date_from_en_string);

public class DateParser : IWriterToRef<string, DateTime>
{
    public bool CanWrite => true;
    public Type FromType => typeof(string);
    public Type ToType => typeof(DateTime);

    public bool TryWrite(string from, ref DateTime to, IServiceProvider? context = null)
    {
        // Get format provider
        IFormatProvider formatProvider =
            context?.GetService(typeof(IFormatProvider)) as IFormatProvider ??
            context?.GetService(typeof(CultureInfo)) as IFormatProvider ??
            CultureInfo.InvariantCulture;
        // 
        DateTimeStyles dateTimeStyles = DateTimeStyles.AllowLeadingWhite | DateTimeStyles.AllowInnerWhite | DateTimeStyles.AllowTrailingWhite;
        // Try parse
        if (!DateTime.TryParse(from, formatProvider, dateTimeStyles, out DateTime dateTime)) return false;
        // Assign result
        to = dateTime;
        // Ok
        return true;
    }

    public bool Accept(IWriterVisitor visitor) => visitor is IWriterVisitor writerVisitor ? writerVisitor.Visit(this) : true;
}

SingleLineServiceProvider(Type, object) offers a single value as service provider.

IServiceProvider fiContext =
    new SingleLineServiceProvider(typeof(CultureInfo), fi);

DictionaryServiceProvider offers a dictionary as service provider.

IServiceProvider fiContext =
    new DictionaryServiceProvider() { { typeof(CultureInfo), fi } };

It can also adapt an existing dictionary to service provider.

// Create dictionary
IDictionary<Type, object> services =
    new Dictionary<Type, object> { { typeof(CultureInfo), fi } };
// Create context
IServiceProvider fiContext =
    new DictionaryServiceProvider(services);

Full Example

Full example

using System;
using System.Collections.Generic;
using System.Globalization;
using Avalanche.Service;
using Avalanche.Utilities;
using Avalanche.Writer;
using static System.Console;

class context
{
    public static void Run()
    {
        {
            // <01>
            // Create parser
            IWriterBase<string, DateTime> dateParser = new DateParser();
            // Create cultures
            CultureInfo fi = new CultureInfo("fi-FI");
            CultureInfo en = new CultureInfo("en");
            // Create context
            IServiceProvider fiContext = new FormatArgument() { FormatProvider = fi };
            IServiceProvider enContext = new FormatArgument() { FormatProvider = en };
            // Create date
            DateTime date = new DateTime(2020, 1, 1, 1, 1, 1);
            // Print Date
            string date_fi = date.ToString(fi);
            string date_en = date.ToString(en);
            WriteLine(date_fi); // "1.1.2020 1.01.01"
            WriteLine(date_en); // "1/1/2020 1:01:01 AM"
            // Parse date
            DateTime date_from_fi_string = dateParser.Read(date_fi, fiContext);
            DateTime date_from_en_string = dateParser.Read(date_en, enContext);
            WriteLine(date_from_fi_string);
            WriteLine(date_from_en_string);
            // </01>
        }
        {
            // Create parser
            IWriterBase<string, DateTime> dateParser = new DateParser();
            // Create cultures
            CultureInfo fi = new CultureInfo("fi-FI");
            CultureInfo en = new CultureInfo("en");
            // Create context
            // <02>
            IServiceProvider fiContext =
                new SingleLineServiceProvider(typeof(CultureInfo), fi);
            // </02>
            IServiceProvider enContext = new SingleLineServiceProvider(typeof(CultureInfo), en);
            // Create date
            DateTime date = new DateTime(2020, 1, 1, 1, 1, 1);
            // Print Date
            string date_fi = date.ToString(fi);
            string date_en = date.ToString(en);
            WriteLine(date_fi); // "1.1.2020 1.01.01"
            WriteLine(date_en); // "1/1/2020 1:01:01 AM"
            // Parse date
            DateTime date_from_fi_string = dateParser.Read(date_fi, fiContext);
            DateTime date_from_en_string = dateParser.Read(date_en, enContext);
            WriteLine(date_from_fi_string);
            WriteLine(date_from_en_string);
        }
        {
            // Create parser
            IWriterBase<string, DateTime> dateParser = new DateParser();
            // Create cultures
            CultureInfo fi = new CultureInfo("fi-FI");
            CultureInfo en = new CultureInfo("en");
            // Create context
            // <03>
            IServiceProvider fiContext =
                new DictionaryServiceProvider() { { typeof(CultureInfo), fi } };
            // </03>
            IServiceProvider enContext = new SingleLineServiceProvider(typeof(CultureInfo), en);
            // Create date
            DateTime date = new DateTime(2020, 1, 1, 1, 1, 1);
            // Print Date
            string date_fi = date.ToString(fi);
            string date_en = date.ToString(en);
            WriteLine(date_fi); // "1.1.2020 1.01.01"
            WriteLine(date_en); // "1/1/2020 1:01:01 AM"
            // Parse date
            DateTime date_from_fi_string = dateParser.Read(date_fi, fiContext);
            DateTime date_from_en_string = dateParser.Read(date_en, enContext);
            WriteLine(date_from_fi_string);
            WriteLine(date_from_en_string);
        }
        {
            // Create parser
            IWriterBase<string, DateTime> dateParser = new DateParser();
            // Create cultures
            CultureInfo fi = new CultureInfo("fi-FI");
            CultureInfo en = new CultureInfo("en");
            // <04>
            // Create dictionary
            IDictionary<Type, object> services =
                new Dictionary<Type, object> { { typeof(CultureInfo), fi } };
            // Create context
            IServiceProvider fiContext =
                new DictionaryServiceProvider(services);
            // </04>
            IServiceProvider enContext = new SingleLineServiceProvider(typeof(CultureInfo), en);
            // Create date
            DateTime date = new DateTime(2020, 1, 1, 1, 1, 1);
            // Print Date
            string date_fi = date.ToString(fi);
            string date_en = date.ToString(en);
            WriteLine(date_fi); // "1.1.2020 1.01.01"
            WriteLine(date_en); // "1/1/2020 1:01:01 AM"
            // Parse date
            DateTime date_from_fi_string = dateParser.Read(date_fi, fiContext);
            DateTime date_from_en_string = dateParser.Read(date_en, enContext);
            WriteLine(date_from_fi_string);
            WriteLine(date_from_en_string);
        }
    }

    // <21>
    public class DateParser : IWriterToRef<string, DateTime>
    {
        public bool CanWrite => true;
        public Type FromType => typeof(string);
        public Type ToType => typeof(DateTime);

        public bool TryWrite(string from, ref DateTime to, IServiceProvider? context = null)
        {
            // Get format provider
            IFormatProvider formatProvider =
                context?.GetService(typeof(IFormatProvider)) as IFormatProvider ??
                context?.GetService(typeof(CultureInfo)) as IFormatProvider ??
                CultureInfo.InvariantCulture;
            // 
            DateTimeStyles dateTimeStyles = DateTimeStyles.AllowLeadingWhite | DateTimeStyles.AllowInnerWhite | DateTimeStyles.AllowTrailingWhite;
            // Try parse
            if (!DateTime.TryParse(from, formatProvider, dateTimeStyles, out DateTime dateTime)) return false;
            // Assign result
            to = dateTime;
            // Ok
            return true;
        }

        public bool Accept(IWriterVisitor visitor) => visitor is IWriterVisitor writerVisitor ? writerVisitor.Visit(this) : true;
    }
    // </21>
}