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WebPartManager.GetGenericWebPart(Control) Method

  • Reference

Definition

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

Gets a reference to the instance of the GenericWebPart control that contains a server control.

public:
 System::Web::UI::WebControls::WebParts::GenericWebPart ^ GetGenericWebPart(System::Web::UI::Control ^ control);
public System.Web.UI.WebControls.WebParts.GenericWebPart GetGenericWebPart (System.Web.UI.Control control);
member this.GetGenericWebPart : System.Web.UI.Control -> System.Web.UI.WebControls.WebParts.GenericWebPart
Public Function GetGenericWebPart (control As Control) As GenericWebPart

Parameters

control
Control

A server control that exists in a WebPartZoneBase and is wrapped as a child control of a GenericWebPart at run time.

Returns

GenericWebPart

A GenericWebPart that wraps control as a child control. The method returns null if control is not contained in a GenericWebPart.

Exceptions

ArgumentNullException

control is null.

Examples

The following code example demonstrates the use of the GetGenericWebPart method. The code example contains a Calendar control declared within a WebPartZone zone. The Button1_Click method first prints the ID of the Calendar control to a label, and then uses the GetGenericWebPart method to retrieve a reference to the GenericWebPart control that wraps the calendar. The ID of the GenericWebPart control, and the ID of its child control (which is the Calendar control), are both printed to a second label.

<%@ 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 Button1_Click(object sender, EventArgs e)
  {
    Label1.Text = "<h2>Server Control</h2>";
    Label1.Text += "Server Control ID:  " + Calendar1.ID;
    Label2.Text = "<h2>GenericWebPart Control</h2>";
    GenericWebPart part = mgr.GetGenericWebPart(Calendar1);
    if (part != null)
    {
      Label2.Text +=
        "GenericWebPart ID:  " + part.ID + "<br />";
      Label2.Text +=
        "Underlying Control ID: " + part.ChildControl.ID;
    }
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:WebPartManager ID="mgr" runat="server" />
      <asp:WebPartZone ID="WebPartZone1" runat="server">
        <ZoneTemplate>
          <asp:Calendar ID="Calendar1" runat="server"
            Title="My Calendar" />
        </ZoneTemplate>
      </asp:WebPartZone>
      <asp:Button ID="Button1" runat="server" 
        Text="Get GenericWebPart"
        OnClick="Button1_Click" />
      <hr />
      <asp:Label ID="Label1" runat="server" Text="" />
      <br />
      <asp:Label ID="Label2" runat="server" Text="" />
    </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 Button1_Click(ByVal sender As Object, _
    ByVal e As System.EventArgs)
    
    Label1.Text = "<h2>Server Control</h2>"
    Label1.Text += "Server Control ID:  " + Calendar1.ID
    Label2.Text = "<h2>GenericWebPart Controls</h2>"
    Dim part As GenericWebPart
    part = mgr.GetGenericWebPart(Calendar1)
    If part IsNot Nothing Then
      Label2.Text += _
        "GenericWebPart ID:  " & part.ID & "<br />"
      Label2.Text += _
        "Underlying Control ID: " + part.ChildControl.ID
    End If
    
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:WebPartManager ID="mgr" runat="server" />
      <asp:WebPartZone ID="WebPartZone1" runat="server">
        <ZoneTemplate>
          <asp:Calendar ID="Calendar1" runat="server"
            Title="My Calendar" />
        </ZoneTemplate>
      </asp:WebPartZone>
      <asp:Button ID="Button1" runat="server" 
        Text="Get GenericWebPart"
        OnClick="Button1_Click" />
      <hr />
      <asp:Label ID="Label1" runat="server" Text="" />
      <br />
      <asp:Label ID="Label2" runat="server" Text="" />
    </div>
    </form>
</body>
</html>

Remarks

In general, there are two categories of controls that developers place in WebPartZoneBase zones to participate in Web Parts applications: WebPart controls, which inherit from the WebPart base class, and other server controls, which can be standard ASP.NET controls, custom controls, or user controls. When any of these controls is placed in a WebPartZoneBase zone, it takes on the functionality of a WebPart control. A WebPart control has this functionality inherently, but the other kinds of server controls do not. To enable the other server controls to act as WebPart controls when they are placed in a WebPartZoneBase zone, ASP.NET wraps them with a GenericWebPart control. Because the GenericWebPart control inherits directly from the WebPart class, it provides its child controls with true Web Parts features.

Often at run time, page developers might want to get a reference to the GenericWebPart control that contains one of the server controls in a zone. The GetGenericWebPart method enables them to retrieve a reference to the GenericWebPart control.

Applies to

See also