List去重的实现
[__DynamicallyInvokable]
public static IEnumerable<TSource> Distinct<TSource>(this IEnumerable<TSource> source, IEqualityComparer<TSource> comparer)
{ if (source == null)
{
throw Error.ArgumentNull("source");
}
return DistinctIterator(source, comparer);
}通过实现IEqualityComparer
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace Extensions
{
public delegate bool ComparerDelegate<T>(T x, T y);
/// <summary>
/// list比较
/// </summary>
/// <typeparam name="T"></typeparam>
public class ListCompare<T> : IEqualityComparer<T>
{
private ComparerDelegate<T> _comparer;
public ListCompare(ComparerDelegate<T> @delegate)
{
this._comparer = @delegate;
}
public bool Equals(T x, T y)
{
if (ReferenceEquals(x, y))
{
return true;
}
if (_comparer != null)
{
return this._comparer(x, y);
}
else
{
return false;
}
}
public int GetHashCode(T obj)
{
return obj.ToString().GetHashCode();
}
}
}使用方法：list= List.Distinct(new ListCompare<Path>((x, y) => x.Latitude == y.Latitude && x.Longitude == y.Longitude)).ToList();