自定义比较器

/// <summary>
/// 自定义比较器 ZhangQC 2016.11.29
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TV"></typeparam>
public class CommonEqualityComparer<T, TV> : IEqualityComparer<T> 
{
private readonly Func<T, TV> _keySelector;

public CommonEqualityComparer(Func<T, TV> keySelector)
{
this._keySelector = keySelector;
} 
public bool Equals(T x, T y)
{
return EqualityComparer<TV>.Default.Equals(_keySelector(x), _keySelector(y)); 
}

public int GetHashCode(T obj)
{
return EqualityComparer<TV>.Default.GetHashCode(_keySelector(obj)); 
}
}