30 lines
1.0 KiB
C#
30 lines
1.0 KiB
C#
namespace MesETL.Shared.Helper;
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public static class DictionaryExtensions
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{
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/// <summary>
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/// 根据指定的键是否存在来添加或是更新字典
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/// </summary>
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/// <param name="this"></param>
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/// <param name="key">指定的键</param>
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/// <param name="addValue">如果指定的键不存在，则向字典添加该值</param>
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/// <param name="updateFactory">如果指定的键存在，则根据该委托的返回值修改字典中对应的值</param>
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/// <typeparam name="TKey"></typeparam>
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/// <typeparam name="TValue"></typeparam>
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/// <returns>添加或是修改后的值</returns>
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public static TValue AddOrUpdate<TKey, TValue>(this IDictionary<TKey, TValue> @this, TKey key, TValue addValue,
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Func<TKey, TValue, TValue> updateFactory)
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{
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if (!@this.TryGetValue(key, out var value))
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{
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@this.Add(key, addValue);
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}
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else
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{
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@this[key] = updateFactory(key, value);
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}
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return @this[key];
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}
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} |