50 lines
1.2 KiB
C#
50 lines
1.2 KiB
C#
using Avalonia.Data.Converters;
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using System.Collections;
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using System.Globalization;
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namespace Cowain.Base.Converters;
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public class ListCountConverter : IValueConverter
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{
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public ListCountConverter()
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{
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}
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public object? Convert(object? value, Type targetType, object? prefix, CultureInfo culture)
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{
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if (value == null)
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return 0;
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// 处理集合类型
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if (value is IEnumerable collection)
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{
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// 优化处理实现了ICollection的集合
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if (collection is ICollection collectionWithCount)
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return collectionWithCount.Count;
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// 否则遍历计数
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int count = 0;
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foreach (var item in collection)
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count++;
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return count;
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}
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// 处理字符串
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if (value is string str)
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return str.Length;
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// 处理数组
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if (value.GetType().IsArray)
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return ((Array)value).Length;
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// 未知类型返回1（表示单个对象）
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return 1;
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}
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public object? ConvertBack(object? value, Type targetType, object? prefix, CultureInfo culture)
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{
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throw new NotSupportedException("ConvertBack is not supported.");
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}
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}
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