C# 使用 LINQ 在 IList 中查找项目

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时间:2020-08-10 16:16:19  来源:igfitidea点击:

Find item in IList with LINQ

c#.netlinqlist

提问by Frenchi In LA

I have an IList:

我有一个 IList:

IList list = CallMyMethodToGetIList();

that I don't know the type I can get it

我不知道我能得到它的类型

Type entityType = list[0].GetType();`

I would like to search this list with LINQ something like:

我想用 LINQ 搜索这个列表,例如:

var itemFind = list.SingleOrDefault(MyCondition....);

Thank you for any help.

感谢您的任何帮助。

采纳答案by T-moty

Simple:

简单的:

IList list = MyIListMethod();

var item = list
    .Cast<object>()
    .SingleOrDefault(i => i is MyType);

or:

或者:

IList list = MyIListMethod();

var item = list
    .Cast<object>()
    .SingleOrDefault(i => i != null);

hope this help!

希望这有帮助!

回答by Silvermind

As Jakob M?ll?s says you could use dynamic. At least it works in LinqPad:

正如 Jakob M?ll?s 所说,您可以使用动态。至少它适用于 LinqPad:

IList list = new List<string>();
list.Add("TEST");
list.Add("NOT");
Console.WriteLine(list.Cast<dynamic>().FirstOrDefault(l => l== "NOT"));

回答by abatishchev

IList list = ...

// if all items are of given type
IEnumerable<YourType> seq = list.Cast<YourType>().Where(condition);

// if only some of them    
IEnumerable<YourType> seq = list.OfType<YourType>().Where(condition);