如何在ASP.NET页面上注册自定义服务器控件

I have a project and I am trying to register a custom server control (there is no .ascx file) on the page. I am currently using

我有一个项目，我试图在页面上注册自定义服务器控件（没有.ascx文件）。我目前正在使用

Class Declaration

namespace MyApp.Controls{
    public class CustomControl: WebControl{
        public string Text
        {
            get
            {
                String s = (String)ViewState["Text"];
                return ((s == null) ? String.Empty : s);
            }
            set
            {
                ViewState["Text"] = value;
            }
        }        
        protected override void RenderContents(HtmlTextWriter output)
        {
            output.Write(Text);
        }
    }
}

On my page,

在我的页面上，

<%@ Register TagPrefix="myControls" Namespace="MyApp.Controls" %>
<myControls:CustomControl runat="server" Text="What up!" />

I receive a Parser Error, with the message "Unknown server tag 'myControls:CustomControl'."

我收到一个Parser Error，消息“Unknown server tag'myControls：CustomControl'。”

What am I doing wrong?

我究竟做错了什么？

4 个解决方案

#1

Well, if this control is in another class library, or even if it's in the same one, it wouldn't be a bad idea to specify control's assembly in @Register:

好吧，如果这个控件在另一个类库中，或者即使它在同一个库中，那么在@Register中指定控件的程序集也不是一个坏主意：

<%@ Register TagPrefix="myControls" Namespace="MyApp.Controls" Assembly="MyApp" %>
   <myControls:CustomControl runat="server" Text="What's up!" />

Clean and rebuild your solution too in order to verify everything is compiled rightly!

清理并重建您的解决方案，以验证所有内容是否正确编译！

#2

If your control will be reused on several pages, you may want to register it in web.config, as one of system.web/pages/controls subelements instead of copy-pasting the same <@Register tag in all affected pages.

如果您的控件将在多个页面上重用，您可能希望在web.config中注册它，作为system.web / pages / controls子元素之一，而不是在所有受影响的页面中复制粘贴相同的<@Register标记。

web.config:

web.config中：

<system.web>
  <pages ...>
    <controls>
      ...
      <add tagPrefix="myCompany" namespace="MyCompany.Whatever.Controls" assembly="Whatever"/>
    </controls>

thepage.aspx:

thepage.aspx：

<myCompany:ControlClassName ID="TheStuff" runat="server" ... />

#3

You should put your control either under the App_Code folder (in the case if the control not in assembly) or add a reference to assembly where this control is:

您应该将控件放在App_Code文件夹下（如果控件不在程序集中），或者添加对此控件所在的程序集的引用：

<%@ Register TagPrefix="myControls" Namespace="MyApp.Controls"
      Assembly="SomeAssembly" %>

But guessing, your control not under the App_Code folder.

但猜测，你的控件不在App_Code文件夹下。

#4

Add an assembly attribute to your register tag

将程序集属性添加到注册标记

#1