WebPartManager.AddWebPart(WebPart, WebPartZoneBase, Int32) Method

Reference

Definition

Namespace:: System.Web.UI.WebControls.WebParts

Assembly:: System.Web.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

public:
 System::Web::UI::WebControls::WebParts::WebPart ^ AddWebPart(System::Web::UI::WebControls::WebParts::WebPart ^ webPart, System::Web::UI::WebControls::WebParts::WebPartZoneBase ^ zone, int zoneIndex);

public System.Web.UI.WebControls.WebParts.WebPart AddWebPart (System.Web.UI.WebControls.WebParts.WebPart webPart, System.Web.UI.WebControls.WebParts.WebPartZoneBase zone, int zoneIndex);

member this.AddWebPart : System.Web.UI.WebControls.WebParts.WebPart * System.Web.UI.WebControls.WebParts.WebPartZoneBase * int -> System.Web.UI.WebControls.WebParts.WebPart

Public Function AddWebPart (webPart As WebPart, zone As WebPartZoneBase, zoneIndex As Integer) As WebPart

Parameters

webPart: WebPart

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

zone: WebPartZoneBase

The WebPartZoneBase that webPart is being added to.

zoneIndex: Int32

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

Returns

WebPart

A WebPart control that was added to the page.

Exceptions

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.

Examples

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>

<%@ Page Language="vb" %>

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

  Protected Sub Button2_Click(ByVal sender As Object, _
    ByVal e As System.EventArgs)
    Dim mgr As WebPartManager = WebPartManager1
    Dim cal As New Calendar()
    cal.ID = "cal1"
    Dim calWebPart As GenericWebPart = mgr.CreateWebPart(cal)
    mgr.AddWebPart(calWebPart, WebPartZone1, 1)
  End Sub

  Protected Sub Button1_Click(ByVal sender As Object, _
    ByVal e As System.EventArgs)

    If WebPartZone1.WebParts.Count > 1 Then
      Dim cal As WebPart = WebPartZone1.WebParts(1)
      If cal.Controls(0).GetType().Name = "Calendar" AndAlso _
        cal IsNot Nothing Then
        WebPartManager1.DeleteWebPart(cal)
      End If
    End If
  End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" 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>

Remarks

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.

Important

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.

Applies to