37 lines
1.1 KiB
C#
37 lines
1.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Data;
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using System.Windows.Markup;
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namespace AntDesign.WPF.Converters;
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/// <summary>
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/// 构造单例的Converter的markup
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/// </summary>
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/// <example>
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/// 示例代码：
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/// <code>
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/// <![CDATA[<TextBlock Text="{Binding Value, Converter={local:GenericConverterExtension Type={x:Type local:MyValueConverter}}}" />]]>
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/// </code>
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/// </example>
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public class GenericConverterExtension : MarkupExtension
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{
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public Type Type { get; set; }
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private static readonly Dictionary<Type, object> _instances = new();
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public override object ProvideValue(IServiceProvider serviceProvider)
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{
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if (Type == null || !typeof(IValueConverter).IsAssignableFrom(Type)|| !typeof(IMultiValueConverter).IsAssignableFrom(Type))
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throw new InvalidOperationException("类型必须是值转换器");
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if (!_instances.TryGetValue(Type, out var instance))
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_instances[Type] = instance = Activator.CreateInstance(Type);
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return instance;
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}
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}
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