为什么没有这个LINQ查询工作？ [英] Why doesn't this LINQ Query Work?

问题描述

我试图帮助别人了，写这个查询：

I was attempting to help someone else out and wrote this query:

var foundTab = (from tab in tabControl1.TabPages
                where tab.Name == "tabName"
                select tab).First();

和他们报告说，他们收到此错误：

And they reported that they received this error:

找不到
源类型
System.Windows.Forms.TabControl.TabPageCollection查询模式的实现。
'如果'未找到。考虑明确
指定范围内
变量'标签'的类型。

Could not find an implementation of the query pattern for source type System.Windows.Forms.TabControl.TabPageCollection'. 'Where' not found. Consider explicitly specifying the type of the range variable 'tab'.

我查MSDN和 TabPageCollection 工具的IList ，的ICollection ，的IEnumerable 。那么，这是怎么回事吗？这是什么错误意味着是有另一种方式来查询选项卡控件的的TabPages 属性？

I checked MSDN and TabPageCollection implements IList, ICollection, IEnumerable. So, what's going on here? What does that error mean and is there another way to query the Tab Control's TabPages property?

推荐答案

试试这个：

var tab = (from System.Windows.Forms.TabPage tab in tabControl1.TabPages
           where tab.Name == "tabName"
           select tab).First();

本代码指定的范围变量的类型。

This code specifies the type of the range variable.

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