WebPart.ExportMode Property

 

Gets or sets whether all, some, or none of a WebPart control's properties can be exported.

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

<PersonalizableAttribute(PersonalizationScope.Shared)>
<ThemeableAttribute(False)>
Public Overridable Property ExportMode As WebPartExportMode

Property Value

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

One of the WebPartExportMode values. The default is None.

Exception Condition
ArgumentOutOfRangeException

The value specified is not one of the WebPartExportMode values.

InvalidOperationException

The control is already loaded and the personalization scope of the control is set to the User scope.

By default, a WebPart control cannot be exported and its ExportMode property is set to None. To enable exporting all properties for the control, set the ExportMode value to All. To export only certain properties while preventing the export of properties that contain sensitive data, you set the property value to NonSensitiveData.

To export property value descriptions for a WebPart control, the properties must also be marked with the Personalizable attribute in the metadata for the property's source code. For details, see PersonalizableAttribute.

System_CAPS_noteNote

To enable the export feature for a Web application that includes Web Parts controls, in the Web.config file for your application, you must add an attribute to the <webParts> element within the <system.web> section, as in the following markup.

<webParts enableExport="true">

</webParts>

This property cannot be set by themes or style sheet themes. For more information, see ThemeableAttribute and ASP.NET Themes and Skins.

The personalization scope of this property is set to Shared and can be modified only by authorized users. For more information, see PersonalizableAttribute and Web Parts Personalization Overview.

The following code example demonstrates the use of the ExportMode property. Note that for the export code example to work, you must also update your Web.config file by adding the attribute enableExport="true" to the <webParts> element, as indicated in the Remarks section.

The first part of this example contains the code for a control named TextDisplayWebPart. This control is the same as the custom control that is found in the Example section of the WebPart class overview, except that it adds a Personalizable attribute to the TextDisplayWebPart.ContentText property so the property can be exported. Note that the attribute declaration includes a value of true for the isSensitive parameter, meaning that the property is marked as sensitive data for export purposes. For the code example to run, you must compile this source code. You can compile it explicitly and put the resulting assembly in your Web site's Bin folder or the global assembly cache. Alternatively, you can put the source code in your site's App_Code folder, where it will be dynamically compiled at run time. This code example assumes that you compile the source code into an assembly, place it in a Bin subfolder of your Web application, and reference the assembly with a Register directive in your Web page. For a walkthrough that demonstrates both methods of compiling, see Walkthrough: Developing and Using a Custom Web Server Control.

Imports System
Imports System.Security.Permissions 
Imports System.Web
Imports System.Web.UI.WebControls 
Imports System.Web.UI.WebControls.WebParts

Namespace Samples.AspNet.VB.Controls

<AspNetHostingPermission(SecurityAction.Demand, _ 
  Level := AspNetHostingPermissionLevel.Minimal)> _ 
<AspNetHostingPermission(SecurityAction.InheritanceDemand, _
  Level := AspNetHostingPermissionLevel.Minimal)> _ 
Public Class TextDisplayWebPart 
  Inherits WebPart
  Private _contentText As String = Nothing
  Private input As TextBox
  Private DisplayContent As Label 
  Private Const _subTitle as String = "Contoso, Ltd"


  Public Sub New()  
    Me.AllowClose = False 
  End Sub 

  <Personalizable(PersonalizationScope.User, True), _
   WebBrowsable()>  _ 
  Public Property ContentText() As String 
    Get 
      Return _contentText 
    End Get 
    Set 
      _contentText = value
    End Set 
  End Property

  Protected Overrides Sub CreateChildControls() 
    Controls.Clear()
    DisplayContent = New Label()
    DisplayContent.Text = Me.ContentText
    DisplayContent.BackColor = _
      System.Drawing.Color.LightBlue
    Me.Controls.Add(DisplayContent) 
    input = New TextBox() 
    Me.Controls.Add(input)
    Dim update As New Button()
    update.Text = "Set Label Content" 
    AddHandler update.Click, AddressOf Me.submit_Click
    Me.Controls.Add(update) 
    ChildControlsCreated = True 

  End Sub 

  Private Sub submit_Click(ByVal sender As Object, _
                           ByVal e As EventArgs)  
    ' Update the label string.
    If input.Text <> String.Empty Then
      _contentText = input.Text & "<br />"
      input.Text = String.Empty 
      DisplayContent.Text = Me.ContentText
    End If

  End Sub 

End Class 

End Namespace 

The second part of the example shows how to reference the TextDisplayWebPart control in an ASP.NET Web page. Note that in the declarative markup, the ExportMode property value is set to All, meaning that even properties with sensitive values will be exported.

<%@ page language="VB" %>
<%@ register tagprefix="aspSample" 
             Namespace="Samples.AspNet.VB.Controls" 
             Assembly="TextDisplayWebPartVB"%>

<!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 id="Head1" runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
  <form id="Form1" runat="server">
    <asp:webpartmanager id="WebPartManager1" runat="server" />
    <asp:webpartzone
      id="WebPartZone1"
      runat="server"
      title="Zone 1"
      PartChromeType="TitleAndBorder">
        <parttitlestyle font-bold="true" ForeColor="#3300cc" />
        <partstyle
          borderwidth="1px"   
          borderstyle="Solid"  
          bordercolor="#81AAF2" />
        <zonetemplate>
          <aspSample:TextDisplayWebPart 
            runat="server"   
            id="textwebpart" 
            title = "Text WebPart" 
            ExportMode="All" 
            />
        </zonetemplate>
    </asp:webpartzone>
    <br />
  </form>
</body>
</html>

Load the Web page in a browser, and on the verbs menu of the WebPart control, click the export verb and follow the instructions to export a description file containing the control's state and property data.

.NET Framework
Available since 2.0
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