开发工具与关键技术:VS2015
作者:曾浩源
撰写时间:2019.2.17
List数组去重复
List去重复一般for循环数组,利用contains()判断是否存在,
然后进行删除或者添加进新的list数组
或许有细心的人发现Distinct()去重 但是打上去却没看到效果
接下来举个例子:
例如以下modelList,不区分大小写去重
List<Model> modelList = new List<Model>()
{
new Model() { ID = 1, Title = "a" },
new Model() { ID = 2, Title = "A" },
new Model() { ID = 3, Title = "b" },
new Model() { ID = 4, Title = "B" },
new Model() { ID = 5, Title = "c" }
};
公有成员变量定义
public class Model
{
public int ID { get; set; }
public string Title { get; set; }
}
定义一个类继承IEqualityComparer接口
public class ModelComparer : IEqualityComparer<Model>
{
public bool Equals(Model x, Model y)
{
return x.Title.ToUpper() == y.Title.ToUpper();
}
public int GetHashCode(Model obj)
{
return obj.Title.ToUpper().GetHashCode();
}
}
PS:ToUpper()方法为该字符串的大写形式
GetHashCode()是判断对象是否相等的快速检查
最后利用Distinct()去重
modelList =
modelList.Distinct(new ModelComparer()).ToList();
return Json(modelList, JsonRequestBehavior.AllowGet);