TagPrefixAttribute(String, String) 构造函数

定义

命名空间:

System.Web.UI

程序集:

System.Web.dll

初始化 TagPrefixAttribute 类的新实例。

public:
 TagPrefixAttribute(System::String ^ namespaceName, System::String ^ tagPrefix);

public TagPrefixAttribute (string namespaceName, string tagPrefix);

new System.Web.UI.TagPrefixAttribute : string * string -> System.Web.UI.TagPrefixAttribute

Public Sub New (namespaceName As String, tagPrefix As String)

参数

namespaceName

String

标识自定义控件命名空间的字符串。

tagPrefix

String

标识自定义控件前缀的字符串。

例外

ArgumentException

namespaceName 或 tagPrefix 为 null 或空字符串 ("")。

示例

下面的代码示例演示如何定义程序集级属性，使你可以为自定义控件指定标记前缀别名。 这些工具（如Microsoft Visual Studio）使用此特性在使用自定义控件的网页中自动生成@ Register指令。

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

[assembly:TagPrefix("CustomControls", "custom")]

namespace CustomControls
{

    // Simple custom control
    public class MyCS_Control : Control
      {
            private String message = "Hello";
            
            public virtual String Message
            {
                  get
                  {
                        return message;
                  }
                  set
                  {
                        message = value;
                  }
            }
            
            [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] 
            protected override void Render( HtmlTextWriter writer)
            {
            writer.Write("<span style='background-color:aqua; font:8pt tahoma, verdana;'> "
                        + this.Message + "<br>" + "C# version. The time on the server is " + System.DateTime.Now.ToLongTimeString()
                        + "</span>");
            }
      }
}

Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls

<assembly: TagPrefix("CustomControls", "custom")> _

Namespace CustomControls
   
   ' Simple custom control
   Public Class MyVB_Control 
   Inherits Control
      Private message As String = "Hello"
      
      Public  Property getMessage() As String
         Get
            Return message
         End Get
         Set (ByVal value As String)
            message = value
         End Set
      End Property
      
      <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
      Protected Overrides Sub Render(writer As HtmlTextWriter)
         writer.Write(("<span style='background-color:aqua; font:8pt tahoma, verdana;'> " + Me.getMessage + "<br>" + "VB version. The time on the server is " + System.DateTime.Now.ToLongTimeString() + "</span>"))
      End Sub
   End Class
End Namespace 'CustomControls

注解

在定义自定义控件以及任何代码之前，应调用此类构造函数，如下所示：

[assembly:TagPrefix(namespace, tag)]