WebPartManager.AddWebPart Method (WebPart, WebPartZoneBase, Int32)

 

Provides the standard programmatic method for adding WebPart controls to a Web page.

Namespace:   System.Web.UI.WebControls.WebParts
Assembly:  System.Web (in System.Web.dll)

public WebPart AddWebPart(
	WebPart webPart,
	WebPartZoneBase zone,
	int zoneIndex
)

Parameters

webPart
Type: System.Web.UI.WebControls.WebParts.WebPart

The WebPart (or server or user control) to be added to a Web page or opened on a page.

zone
Type: System.Web.UI.WebControls.WebParts.WebPartZoneBase

The WebPartZoneBase that webPart is being added to.

zoneIndex
Type: System.Int32

An integer that represents the ordinal position that webPart occupies in zone, relative to other controls in zone.

Return Value

Type: System.Web.UI.WebControls.WebParts.WebPart

A WebPart control that was added to the page.

Exception Condition
ArgumentNullException

webPart is null.

- or -

zone is null.

ArgumentException

zone is not registered in the WebPartManager control's collection of zones.

- or -

webPart is already in zone.

ArgumentOutOfRangeException

The value of zoneIndex is less than zero.

The AddWebPart method is used both to add new dynamic WebPart controls to a page, and to reopen static or dynamic controls that have previously been closed on a page. When the method is called to add a new control, it actually creates a copy of the control referenced in the webPart parameter. A new ID is generated for the copy of the control, so developers should reference the WebPart control returned from the method to get the new ID value. When the method is called to reopen a previously closed control, it returns a direct reference to the control referenced by the webPart parameter.

System_CAPS_importantImportant

You should always use the AddWebPart method, rather than the Add method of the collection of controls referenced by the WebPartManager.Controls property, to add WebPart controls programmatically to the page, because using the Add method throws an exception. To add a control that is not a WebPart control (in other words, a server control that will be wrapped with a GenericWebPart control at run time), you should first call the CreateWebPart method to create the control, and then call the AddWebPart method to add the control. For a demonstration of this approach, see the Example section.

The following code example demonstrates use of the AddWebPart method to add a server control programmatically to a page. The page markup contains an empty <asp:webpartzone> element, and an <asp:webpartmanager> element. The first time the Add Calendar button is clicked, the code in the event handler creates a Calendar control, and adds it to a zone as a GenericWebPart object, calling the AddWebPart method.

<%@ Page Language="C#" %>

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

  protected void Button2_Click(object sender, EventArgs e)
  {
    WebPartManager mgr = WebPartManager1;
    Calendar cal = new Calendar();
    cal.ID = "cal1";
    GenericWebPart calWebPart = mgr.CreateWebPart(cal);
    mgr.AddWebPart(calWebPart, WebPartZone1, 1);
  }

  protected void Button1_Click(object sender, EventArgs e)
  {
    if (WebPartZone1.WebParts.Count > 1)
    {
      WebPart cal = WebPartZone1.WebParts[1];
      if (cal.Controls[0].GetType().Name == "Calendar" 
        && cal != null)
        WebPartManager1.DeleteWebPart(cal);
    }

  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Adding a Server Control</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:WebPartManager ID="WebPartManager1" 
        runat="server" />
      <asp:WebPartZone ID="WebPartZone1" runat="server">
        <ZoneTemplate>
          <asp:BulletedList  
            DisplayMode="HyperLink" 
            ID="BulletedList1" 
            runat="server"
            Title="My Links">
            <asp:ListItem Value="http://www.microsoft.com">
            Microsoft
            </asp:ListItem>
            <asp:ListItem Value="http://www.msn.com">
            MSN
            </asp:ListItem>
            <asp:ListItem Value="http://www.contoso.com">
            Contoso Corp.
            </asp:ListItem>
          </asp:BulletedList>
        </ZoneTemplate>
      </asp:WebPartZone>
      <asp:Button ID="Button1" runat="server" 
        Text="Delete Calendar" 
        OnClick="Button1_Click" />
      <asp:Button ID="Button2" runat="server" 
        Text="Add Calendar" 
        OnClick="Button2_Click" />
    </div>
    </form>
</body>
</html>

.NET Framework
Available since 2.0
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