如何在LINQ的where子句中添加in命令

Question

where子句如下:

Where item.field == "value"

如何将LINQ中的语句更改为:

   Where item.field in ("value1","value2","value3")

看起来很简单，但行不通。

Thanks in advance

Answer 1

首先在变量中声明你的"in"值集合:

var collection = new[] { "value1","value2","value3" };

然后在query: 中使用

...
where collection.Contains(item.field)
...

Answer 2

或者在lambda语法中(假设您有一个正在搜索的集合):

var lookup = new[] { "value1","value2","value3" };
var result = collection.Where(x=> lookup.Contains(x)).ToArray();