C# 找不到命名空间名称“Control”的类型（您是否缺少 using 指令或程序集引用？）
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The type of namespace name 'Control' could not be found (are you missing a using directive or assembly reference?)
提问by flavour404
Trying to set up an extension method in .Net 3.0 using generics and I get an error message, details above on the line:
尝试使用泛型在 .Net 3.0 中设置扩展方法，我收到一条错误消息，上面有详细信息：
foreach(Control childControl in parent.Controls)
Am I missing a using directive or assembly reference?
我是否缺少 using 指令或程序集引用？
Thanks
谢谢
What I am trying to do is set this up (below) as an extender function:
我想要做的是将其设置（如下）作为扩展器功能：
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
namespace System.Runtime.CompilerServices
{
public static class ControlHelper
{
public static T FindControl<T>(this Control parent, string controlName) where T : Control
{
T found = parent.FindControl(controlName) as T;
if (found != null)
return found;
foreach (Control childControl in parent.Controls)
{
found = childControl.FindControl(controlName) as T;
if (found != null)
break;
}
return found;
}
}
}
I am missing a reference to the system.core.dll... its driving me nuts!
我缺少对 system.core.dll 的引用……这让我发疯了！
采纳答案by Sam Harwell
Choose the one for the technology you're using:
为您使用的技术选择一种：
Windows Forms:
Windows 窗体：
It's located in System.Windows.Forms.dllin the System.Windows.Formsnamespace.
它位于System.Windows.Forms.dll在System.Windows.Forms命名空间。
WPF:(probably not this one, because there's no relevant Controlsproperty in the WPF classes)
WPF：（可能不是这个，因为ControlsWPF 类中没有相关属性）
It's located PresentationFramework.dllin the System.Windows.Controlsnamespace.
它位于PresentationFramework.dll在System.Windows.Controls命名空间。
Web Controls:
网页控制：
It's located System.Web.dllin the System.Web.UInamespace.
它位于System.Web.dll在System.Web.UI命名空间。
回答by user20492
- Add the System.web.dll to refrence in solution explorer at right side.
- Add the namespace - System.Web.UI.WebControls; at the top of your web page.
- then you can create the web control by the coding itself.
- 将 System.web.dll 添加到右侧解决方案资源管理器中的引用。
- 添加命名空间 - System.Web.UI.WebControls; 在您的网页顶部。
- 然后您可以通过编码本身来创建 Web 控件。
