C# IEqualityComparer 使用方法 Linq Distinct使用方法

public class TipComparer : IEqualityComparer<TipDetails>
{
public bool Equals(TipDetails x, TipDetails y)
{
if (Object.ReferenceEquals(x, y)) return true;

if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))
return false;

return x.tiptitle == y.tiptitle;
}
public int GetHashCode(TipDetails obj)
{
if (obj == null) return 0; return obj.tiptitle.GetHashCode();
}
}

result.tipdetails.Distinct(new TipComparer())