WebPartDescription Class
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WebPartDescription Class

 

Provides information about a WebPart control that you can display in a catalog of Web Parts controls without having to create an instance of the control.

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

System.Object
  System.Web.UI.WebControls.WebParts.WebPartDescription

type WebPartDescription = class end

NameDescription
System_CAPS_pubmethodWebPartDescription(String, String, String, String)

Initializes a new instance of the class by using several strings that contain description information for a WebPart control.

System_CAPS_pubmethodWebPartDescription(WebPart)

Initializes a new instance of the class when a WebPart control instance is available.

NameDescription
System_CAPS_pubpropertyCatalogIconImageUrl

Gets a URL containing the path to an image used as an icon for a WebPart control.

System_CAPS_pubpropertyDescription

Gets the text of a description for a WebPart control.

System_CAPS_pubpropertyID

Gets the ID of a corresponding WebPart control.

System_CAPS_pubpropertyTitle

Gets the title text of a corresponding WebPart control.

NameDescription
System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

When WebPart controls are displayed in a catalog of controls that users can add to a page, some basic information about each control is required. For example, it is useful to have a title for the control, and a description, so that as users view a catalog they have enough information to decide whether to add a control to the page. However, a catalog of WebPart controls can potentially contain many controls, and it could affect the performance of an application if an instance of every WebPart control must be created to extract the information to display in the catalog.

The WebPartDescription class exists so that it is not necessary to create an instance of a WebPart control to retrieve the information about the control that is displayed in a catalog of controls. In the Web Parts control set, a WebPartDescription object is also used in conjunction with the various CatalogPart controls when a page is in catalog display mode.

The WebPartDescription class has two overloads of its constructor, one that takes a WebPart control as a parameter when an instance is available (the WebPartDescription constructor), and one that takes several strings with information about the control as parameters (the WebPartDescription constructor).

The WebPartDescription class also has several properties designed to contain the description information for WebPart controls. The following table summarizes the WebPartDescription properties, and what property each one corresponds to in a WebPart control.

Description property

Related part control property

ID

ID

Title

Title

Description

Description

CatalogIconImageUrl

CatalogIconImageUrl

The following code example demonstrates programmatic use of the WebPartDescription class. Ordinarily, this type is used primarily by the Web Parts control set, but this code example is simply showing basic programmatic usage of the main description properties.

The code example has four parts:

  • A user control that enables users to change display modes on a Web page.

  • A custom WebPart control.

  • A Web page to host the other controls.

  • An explanation of how the code example works.

The first part of the code example is the user control. The source code for the user control comes from another topic. For more details about the user control, see the topic Walkthrough: Changing Display Modes on a Web Parts Page.

No code example is currently available or this language may not be supported.

The second part of the code example is a custom WebPart control. 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 uses the approach of dynamic compilation. For a walkthrough that demonstrates how to compile, see Walkthrough: Developing and Using a Custom Web Server Control.

No code example is currently available or this language may not be supported.

The third part of the code example is the Web page. Near the top are two Register directives: one that registers the user control, and the other to register the custom WebPart control whose source file is located in the App_Code folder of your site. The page contains an <asp:catalogzone> element, which in turn contains declarative references to two controls: the custom WebPart control named TextDisplayWebPart, and a BulletedList Web server control that will be treated as a WebPart control at run time because the WebPartManager control will wrap it with a GenericWebPart object. Note that in the code for the Button1_Click method, the available WebPartDescription objects for the WebPart controls in the catalog are retrieved using the GetAvailableWebPartDescriptions method, and then the description details are all written out to the page.

No code example is currently available or this language may not be supported.

After you load the page in a browser, use the Display Mode drop-down list control and select Catalog to change the page to catalog display mode. In the catalog, you should see the two controls that are available to be added to the page. Click the List WebPartDescription Information button, and the code writes out the values of all available WebPartDescription objects to the page. This demonstrates that you can retrieve description details for WebPart controls in a catalog without having to create instances of the controls themselves.

.NET Framework
Available since 2.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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