C# 如何将 IQueryable<T> 转换为 List<T>？
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How to convert an IQueryable<T> to a List<T>?
提问by Prabu
Just learning LINQ and i've come to a newbie roadblock in my test project. Can you explain what i'm doing wrong?
刚刚学习 LINQ，我在我的测试项目中遇到了新手障碍。你能解释一下我做错了什么吗？
public List<ToDoListInfo> retrieveLists(int UserID)
{
//Integrate userid specification later - need to add listUser table first
IQueryable<ToDoListInfo> lists =
from l in db.ToDoLists
select new ToDoListInfo {
ListID = l.ListID,
ListName = l.ListName,
Order = l.Order,
Completed = l.Completed
};
return lists.ToList<ToDoListInfo>;
}
I'm getting an error saying the following:
我收到一条错误消息，内容如下：
Cannont convert method group 'ToList' to non-delegate type 'System.Collections.Generic.List' Do you intend to invoke the method?
无法将方法组“ToList”转换为非委托类型“System.Collections.Generic.List”您是否打算调用该方法？
采纳答案by Thomas Danecker
You just need parantheses:
你只需要括号：
lists.ToList<ToDoListInfo>();
lists.ToList<ToDoListInfo>();
Also, you do not have to declare the type parameter, i.e. you could use the following and let the type-system infer the type parameter:
此外，您不必声明类型参数，即您可以使用以下内容并让类型系统推断类型参数：
lists.ToList();
lists.ToList();
回答by Nathan W
You are just missing the closing brackets on ToList, should be:
您只是缺少 ToList 上的右括号，应该是：
ToList();
or
或者
ToList<ToDoListInfo>();
