使用英语阅读

通过

WebPartZoneBase.OnCreateVerbs(WebPartVerbsEventArgs) 方法

定义

命名空间:
System.Web.UI.WebControls.WebParts
程序集:
System.Web.dll

引发 CreateVerbs 事件。

C# 
protected virtual void OnCreateVerbs(System.Web.UI.WebControls.WebParts.WebPartVerbsEventArgs e);

参数

e
WebPartVerbsEventArgs

包含事件数据的 EventArgs。

示例

下面的代码示例演示了一种通过重写 OnCreateVerbs 方法为 CreateVerbs 事件创建处理程序的方法，以便将自定义谓词添加到派WebPartZoneBase生区域。

该代码示例包含两个源文件。 若要运行代码示例，必须编译此源代码。 可以显式编译它，并将生成的程序集放入网站的 Bin 文件夹或全局程序集缓存中。 或者，可以将源代码放入站点的“App_Code”文件夹中，并在运行时动态编译源代码。 此代码示例使用动态编译。 有关演示如何编译的演练，请参阅 演练：开发和使用自定义 Web 服务器控件。

代码示例的第一部分是派生自 类的简单控件的 WebPart 源代码。

C# 
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Security.Permissions;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace Samples.AspNet.CS.Controls
{

    // This code snippet creates a simple Web Part control.
    [AspNetHostingPermission(SecurityAction.Demand,
      Level = AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand,
      Level = AspNetHostingPermissionLevel.Minimal)]
    public class SimpleControl : WebPart
    {

        private String _text = "Simple control text";

        public string Text
        {
            get
            {
                if (_text != null)
                    return _text;
                else
                    return string.Empty;
            }
            set { _text = value; }
        }

        protected override void Render(System.Web.UI.HtmlTextWriter 
      writer)
        {
            writer.Write(this.Text);
        }
    }
}

代码示例的第二部分是派生 WebPartZoneBase 区域的源代码，该代码将替代 OnCreateVerbs 方法以将自定义谓词添加到区域。 该代码还会创建一个自定义谓词，该谓词显示在区域中包含的控件的 WebPart 谓词菜单中，该谓词将创建当前 WebPart 控件的另一个副本。

C# 
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Security.Permissions;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace Samples.AspNet.CS.Controls
{
/* 
This code sample creates a Web Part zone and adds the 
"Copy Web Part" verb to any control in the zone.
*/
[AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
public class ZoneWithAddedVerb : WebPartZone
{

  protected override void OnCreateVerbs(WebPartVerbsEventArgs e)
  {
    List<WebPartVerb> newVerbs = new List<WebPartVerb>();
    newVerbs.Add(new CopyWebPartVerb(CopyWebPartToNewOne));
    e.Verbs = new WebPartVerbCollection(e.Verbs,newVerbs);
    base.OnCreateVerbs(e);
  }

  void CopyWebPartToNewOne(object sender, WebPartEventArgs e)
  {
    WebPartManager wpmgr = 
      WebPartManager.GetCurrentWebPartManager(Page);
    System.Web.UI.WebControls.WebParts.WebPart wp;
    Type tp = e.WebPart.GetType(); 
    wp = (System.Web.UI.WebControls.WebParts.WebPart)Activator.CreateInstance(tp);   
    wpmgr.AddWebPart(wp, e.WebPart.Zone, e.WebPart.ZoneIndex + 1);
  }
}
  [AspNetHostingPermission(SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
  internal class CopyWebPartVerb : WebPartVerb
  {
    private const String _copyWebPartImageUrl = "~/CopyVerb.ico";

    internal CopyWebPartVerb(WebPartEventHandler serverClickHandler) :  
       base("MyVerb", serverClickHandler)
    { }
    public override string Text
    {
      get { return "Copy Web Part"; }
      set { ;}
    }
    public override string Description
    {
      get { return "This verb will copy this web part control " +
        "to a new one below"; }
      set { ; }
    }
    public override bool Enabled
    {
      get { return base.Enabled; }
      set { base.Enabled = value; }
    }
    
    public override string ImageUrl
    {
      get { return _copyWebPartImageUrl; }
      set { ; }
    }
  }
}

代码示例的第三部分是承载派生区域和 WebPart 控件的网页。 页面顶部附近是引用 Register 派生区域组件的指令。 如果在浏览器中加载页面，则 WebPart 控件将显示在区域中。 单击谓词菜单，然后单击 CopyWebPart 谓词，然后创建控件的副本。

ASP.NET (C#) 
<%@ Page Language="C#" %>
<%@ Register TagPrefix="verbsample" 
    namespace="Samples.AspNet.CS.Controls" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:WebPartManager ID="WebPartManager1" runat="server" />
    <verbsample:ZoneWithAddedVerb id="ZoneWithAddedVerb1" 
      HeaderText="Zone with Added Verb" runat="server">
        <ZoneTemplate>
           <verbsample:SimpleControl id="SimpleControl1" 
            title="Simple Control" runat="server" /> 
        </ZoneTemplate>
        </verbsample:ZoneWithAddedVerb>
     </form>
</body>
</html>

注解

可以在派生WebPartZoneBase区域类中重写 OnCreateVerbs 方法，以将其他WebPartVerb对象添加到区域中的标准谓词集合。 可以通过向 属性中的 Verbs 集合添加谓词来执行此操作。

适用于

产品 版本
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1

另请参阅