yyl
2025-12-09 bddf4df7cbb292011a974b705d6f6d94c0ac6cc1
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using System;
using System.Collections.Generic;
 
public static class CollectionExtensions
{
    public static bool Contains<T>(this T[] source, T value)
    {
        return Array.IndexOf(source, value) != -1;
    }
 
}