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GeezerVison is showing github.com — bytecode-api/BytecodeApi.Wpf/ConverterBase.cs at master · bytecode77/bytecode-api

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using System.Globalization;
using System.Windows;
using System.Windows.Data;
using System.Windows.Markup;
namespace BytecodeApi.Wpf;
/// <summary>
/// Represents the base class that wraps the <see cref="IValueConverter" /> and provides a simplified wrapper method for Convert. ConvertBack always returns <see cref="DependencyProperty.UnsetValue" />. This is an abstract class.
/// </summary>
/// <typeparam name="TValue">The type of the value to convert.</typeparam>
public abstract class ConverterBase<TValue> : MarkupExtension, IValueConverter
{
/// <summary>
/// Specifies a converter that is used to convert the result of this converter. This can be used to apply multiple conversions on a value.
/// </summary>
public IValueConverter? Then { get; set; }
/// <summary>
/// If <see cref="Then" /> is not <see langword="null" />, specifies a converter parameter that is used to convert the result of this converter.
/// </summary>
public object? ThenParameter { get; set; }
/// <summary>
/// Initializes a new instance of the <see cref="ConverterBase{TValue}" /> class.
/// </summary>
protected ConverterBase()
{
}
/// <summary>
/// Converts a value.
/// </summary>
/// <param name="value">The value produced by the binding source.</param>
/// <returns>
/// A converted value. If the method returns <see langword="null" />, the valid null value is used.
/// </returns>
public abstract object? Convert(TValue? value);
object? IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
object? result = Convert(CSharp.CastOrDefault<TValue>(value));
return Then == null ? result : Then.Convert(result, targetType, ThenParameter, culture);
}
object? IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return DependencyProperty.UnsetValue;
}
/// <summary>
/// Returns this instance of <see cref="IValueConverter" />.
/// </summary>
/// <param name="serviceProvider">Object that can provide services for the markup extension.</param>
/// <returns>
/// This instance of <see cref="IValueConverter" />.
/// </returns>
public sealed override object ProvideValue(IServiceProvider serviceProvider)
{
return this;
}
}
/// <summary>
/// Represents the base class that wraps the <see cref="IValueConverter" /> and provides a simplified wrapper method for Convert. ConvertBack always returns <see cref="DependencyProperty.UnsetValue" />. This is an abstract class.
/// </summary>
/// <typeparam name="TValue">The type of the value to convert.</typeparam>
/// <typeparam name="TParameter">The type of the parameter used for conversion.</typeparam>
public abstract class ConverterBase<TValue, TParameter> : MarkupExtension, IValueConverter
{
/// <summary>
/// Specifies a converter that is used to convert the result of this converter. This can be used to apply multiple conversions on a value.
/// </summary>
public IValueConverter? Then { get; set; }
/// <summary>
/// If <see cref="Then" /> is not <see langword="null" />, specifies a converter parameter that is used to convert the result of this converter.
/// </summary>
public object? ThenParameter { get; set; }
/// <summary>
/// Initializes a new instance of the <see cref="ConverterBase{TValue, TParameter}" /> class.
/// </summary>
protected ConverterBase()
{
}
/// <summary>
/// Converts a value.
/// </summary>
/// <param name="value">The value produced by the binding source.</param>
/// <param name="parameter">The converter parameter to use.</param>
/// <returns>
/// A converted value. If the method returns <see langword="null" />, the valid null value is used.
/// </returns>
public abstract object? Convert(TValue? value, TParameter? parameter);
object? IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
object? result = Convert(CSharp.CastOrDefault<TValue>(value), CSharp.CastOrDefault<TParameter>(parameter));
return Then == null ? result : Then.Convert(result, targetType, ThenParameter, culture);
}
object? IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return DependencyProperty.UnsetValue;
}
/// <summary>
/// Returns this instance of <see cref="IValueConverter" />.
/// </summary>
/// <param name="serviceProvider">Object that can provide services for the markup extension.</param>
/// <returns>
/// This instance of <see cref="IValueConverter" />.
/// </returns>
public sealed override object ProvideValue(IServiceProvider serviceProvider)
{
return this;
}
}
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