关于Linq的对List<实体>去掉重复ID的一个小例子！

      注意 下面的代码只要ID相同(即使其他的不相同)都会过滤掉，简单来讲就是过滤掉ID相同的实体，如果ID相同，其他属性取第一个的值

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List<Abc> list = new List<Abc>();             Abc abc1 = new Abc();             abc1.Id = 1;             abc1.Name = "张三";             abc1.Value = "a";             list.Add(abc1);             Abc abc2 = new Abc();             abc2.Id = 1;             abc2.Name = "张三";             abc2.Value = "b";             list.Add(abc2);             Abc abc3 = new Abc();             abc3.Id = 1;             abc3.Name = "张三";             abc3.Value = "a";             list.Add(abc3);             Abc abc4 = new Abc();             abc4.Id = 1;             abc4.Name = "张三";             abc4.Value = "e";             list.Add(abc4);             Abc abc5 = new Abc();             abc5.Id = 1;             abc5.Name = "张三";             abc5.Value = "c";             list.Add(abc5);             list = list.GroupBy(o => o.Id).Select(p => new Abc { Id = p.Key, Name = p.FirstOrDefault().Name, Value = p.FirstOrDefault().Value }).ToList();

 结果 只有   list.count=1  id=1,Name="张三", Value="a"