ObjectDataSourceDesigner Class

Definition

Namespace:

System.Web.UI.Design.WebControls

Assembly:

System.Design.dll

Provides design-time support in a visual designer for the ObjectDataSource Web server control.

public ref class ObjectDataSourceDesigner : System::Web::UI::Design::DataSourceDesigner

public class ObjectDataSourceDesigner : System.Web.UI.Design.DataSourceDesigner

type ObjectDataSourceDesigner = class
    inherit DataSourceDesigner

Public Class ObjectDataSourceDesigner
Inherits DataSourceDesigner

Inheritance

Object

ComponentDesigner

HtmlControlDesigner

ControlDesigner

DataSourceDesigner

ObjectDataSourceDesigner

Examples

The following code example shows how to extend the ObjectDataSourceDesigner class to change the appearance and behavior of controls that are derived from the ObjectDataSource control at design time.

The example derives the MyObjectDataSource control from the ObjectDataSource. The MyObjectDataSource is a copy of the ObjectDataSource control. The example also derives the MyObjectDataSourceDesigner class from the ObjectDataSourceDesigner and applies a DesignerAttribute attribute for the MyObjectDataSourceDesigner on the MyObjectDataSource control.

The MyObjectDataSourceDesigner overrides the PreFilterProperties method to make the NamingContainer property visible in the Properties grid at design time.

The MyObjectDataSourceDesigner overrides the GetDesignTimeHtml method to display the TypeName and SelectMethod properties in a placeholder, in addition to the control type and ID.

using System;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.Design.WebControls;
using System.Collections;
using System.ComponentModel;
using System.Security.Permissions;

namespace Examples.CS.WebControls.Design
{
    // The MyObjectDataSource is a copy of the ObjectDataSource.
    [AspNetHostingPermission(SecurityAction.Demand, 
        Level = AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, 
        Level = AspNetHostingPermissionLevel.Minimal)]
    [Designer(typeof(Examples.CS.WebControls.Design.
        MyObjectDataSourceDesigner))]
    public class MyObjectDataSource : ObjectDataSource
    {
    } // MyObjectDataSource

    // Derive a designer that inherits from the ObjectDataSourceDesigner.
    [ReflectionPermission(SecurityAction.Demand, Flags=ReflectionPermissionFlag.MemberAccess)]
    public class MyObjectDataSourceDesigner : ObjectDataSourceDesigner
    {
        // Generate the design-time markup.
        public override string GetDesignTimeHtml()
        {
            // Get a reference to the control or a copy of the control.
            MyObjectDataSource myODS = (MyObjectDataSource)ViewControl;

            // Create a placeholder that displays the type of the business 
            // object and the name of the Select method.
            string markup = CreatePlaceHolderDesignTimeHtml(
                 "<b>TypeName</b> \"" + myODS.TypeName + "\"<br />" + 
                 "<b>SelectMethod</b> \"" + myODS.SelectMethod + "\"" );

            return markup;
        } // GetDesignTimeHtml

        // Shadow the control properties with design-time properties.
        protected override void PreFilterProperties(IDictionary properties)
        {
            // Call the base method first.
            base.PreFilterProperties(properties);

            // Make the NamingContainer visible in the Properties grid.
            PropertyDescriptor selectProp =
                (PropertyDescriptor)properties["NamingContainer"];
            properties["NamingContainer"] =
                TypeDescriptor.CreateProperty(selectProp.ComponentType,
                    selectProp, BrowsableAttribute.Yes);
        } // PreFilterProperties
    } // MyObjectDataSourceDesigner
} // Examples.CS.WebControls.Design

Imports System.Web
Imports System.Web.UI.WebControls
Imports System.Web.UI.Design.WebControls
Imports System.Collections
Imports System.ComponentModel
Imports System.Security.Permissions

Namespace Examples.VB.WebControls.Design

    ' The MyObjectDataSource is a copy of the ObjectDataSource.
    <AspNetHostingPermission(SecurityAction.Demand, _
        Level:=AspNetHostingPermissionLevel.Minimal)> _
    <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
        Level:=AspNetHostingPermissionLevel.Minimal)> _
    <Designer(GetType(Examples.VB.WebControls.Design. _
        MyObjectDataSourceDesigner))> _
    Public Class MyObjectDataSource
        Inherits ObjectDataSource
    End Class

    ' Derive a designer that inherits from the ObjectDataSourceDesigner.
    <ReflectionPermission(SecurityAction.Demand, Flags:=ReflectionPermissionFlag.MemberAccess)> _
    Public Class MyObjectDataSourceDesigner
        Inherits ObjectDataSourceDesigner

        ' Generate the design-time markup.
        Public Overrides Function GetDesignTimeHtml() As String

            ' Get a reference to the control or a copy of the control.
            Dim myODS As MyObjectDataSource = _
                CType(ViewControl, MyObjectDataSource)

            Dim markup As String = _
                CreatePlaceHolderDesignTimeHtml( _
                    "<b>TypeName</b> """ & myODS.TypeName & """<br />" & _
                    "<b>SelectMethod</b> """ & myODS.SelectMethod & """")

            Return markup

        End Function ' GetDesignTimeHtml

        ' Shadow the control properties with design-time properties.
        Protected Overrides Sub PreFilterProperties( _
            ByVal properties As IDictionary)

            ' Call the base method first.
            MyBase.PreFilterProperties(properties)

            ' Make the NamingContainer visible in the Properties grid.
            Dim selectProp As PropertyDescriptor = _
                CType(properties("NamingContainer"), PropertyDescriptor)
            properties("NamingContainer") = _
                TypeDescriptor.CreateProperty(selectProp.ComponentType, _
                    selectProp, BrowsableAttribute.Yes)
        End Sub

    End Class
End Namespace ' Examples.VB.WebControls.Design

Remarks

The ObjectDataSource control represents a data source that calls methods of a business object in order to perform the Delete, Insert, Select, and Update database operations.

In a visual designer, when you switch from Source to Design view, the markup source code that describes the ObjectDataSource control is parsed and a design-time version of the control is created on the design surface. When you switch back to Source view, the design-time control is persisted to the markup source code and edited into the markup for the Web page. The ObjectDataSourceDesigner class provides design-time support for the ObjectDataSource control in a visual designer.

The ObjectDataSourceDesigner class members provide the following functionality:

• The CanConfigure property indicates whether the Configure Data Source wizard can be displayed. The CanRefreshSchema property indicates whether the schema of the associated ObjectDataSource control can be refreshed at design time.

• The SelectMethod property specifies the method that performs the Select function. The TypeName property specifies the type of the business object that provides the data for the associated control.

• The GetView method returns a data source view with the specified name. The GetViewNames method returns a list of data source view names for the associated ObjectDataSource control. The RefreshSchema method extracts the metadata for the Select method from the associated business object.

• The Configure method causes the Configure Data Source wizard to be displayed on the visual designer surface. The PreFilterProperties method removes properties from, adds additional properties to, or shadows properties of the associated control.

Constructors

ObjectDataSourceDesigner()

Initializes a new instance of the ObjectDataSourceDesigner class.

Properties

ActionLists	Gets a list of items that are used to create an action list menu at design time. (Inherited from DataSourceDesigner)
AllowResize	Gets a value indicating whether the control can be resized in the design-time environment. (Inherited from ControlDesigner)
AssociatedComponents	Gets the collection of components associated with the component managed by the designer. (Inherited from ComponentDesigner)
AutoFormats	Gets the collection of predefined automatic formatting schemes to display in the Auto Format dialog box for the associated control at design time. (Inherited from ControlDesigner)
Behavior	Obsolete. Gets or sets the DHTML behavior that is associated with the designer. (Inherited from HtmlControlDesigner)
CanConfigure	Gets a value that indicates whether the Configure() method can be called.
CanRefreshSchema	Gets a value that indicates whether the RefreshSchema(Boolean) method can be called.
Component	Gets the component this designer is designing. (Inherited from ComponentDesigner)
DataBindings	Gets the data bindings collection for the current control. (Inherited from HtmlControlDesigner)
DataBindingsEnabled	Gets a value indicating whether data binding is supported by the containing region for the associated control. (Inherited from ControlDesigner)
DesignerState	Gets an object that is used to persist data for the associated control at design time. (Inherited from ControlDesigner)
DesignTimeElement	Obsolete. Gets the design-time object representing the control that is associated with the HtmlControlDesigner object on the design surface. (Inherited from HtmlControlDesigner)
DesignTimeElementView	Obsolete. Gets the view-control object for the control designer. (Inherited from ControlDesigner)
DesignTimeHtmlRequiresLoadComplete	Obsolete. Gets a value indicating whether the design host must finish loading before the GetDesignTimeHtml method can be called. (Inherited from ControlDesigner)
Expressions	Gets the expression bindings for the current control at design time. (Inherited from HtmlControlDesigner)
HidePropertiesInTemplateMode	Gets a value indicating whether the properties of the associated control are hidden when the control is in template mode. (Inherited from ControlDesigner)
ID	Gets or sets the ID string for the control. (Inherited from ControlDesigner)
InheritanceAttribute	Gets an attribute that indicates the type of inheritance of the associated component. (Inherited from ComponentDesigner)
Inherited	Gets a value indicating whether this component is inherited. (Inherited from ComponentDesigner)
InTemplateMode	Gets a value indicating whether the control is in either template viewing or editing mode in the design host. The InTemplateMode property is read-only. (Inherited from ControlDesigner)
IsDirty	Obsolete. Gets or sets a value indicating whether the Web server control has been marked as changed. (Inherited from ControlDesigner)
ParentComponent	Gets the parent component for this designer. (Inherited from ComponentDesigner)
ReadOnly	Obsolete. Gets or sets a value indicating whether the properties of the control are read-only at design time. (Inherited from ControlDesigner)
RootDesigner	Gets the control designer for the Web Forms page that contains the associated control. (Inherited from ControlDesigner)
SelectMethod	Gets or sets the name of the method to execute when the Select() method of the associated control is called.
SetTextualDefaultProperty	(Inherited from ComponentDesigner)
ShadowProperties	Gets a collection of property values that override user settings. (Inherited from ComponentDesigner)
ShouldCodeSerialize	Obsolete. Gets or sets a value indicating whether to create a field declaration for the control in the code-behind file for the current design document during serialization. (Inherited from HtmlControlDesigner)
SuppressingDataSourceEvents	Gets a value indicating whether the DataSourceChanged event or the RefreshSchema(Boolean) method occurs. (Inherited from DataSourceDesigner)
Tag	Gets an object representing the HTML markup element for the associated control. (Inherited from ControlDesigner)
TemplateGroups	Gets a collection of template groups, each containing one or more template definitions. (Inherited from ControlDesigner)
TypeName	Gets or sets the name of the type that contains the methods that are specified in the associated control.
UsePreviewControl	Gets a value indicating whether the control designer uses a temporary preview control to generate the design-time HTML markup. (Inherited from ControlDesigner)
Verbs	Gets the design-time verbs supported by the component that is associated with the designer. (Inherited from ComponentDesigner)
ViewControl	Gets or sets a Web server control that can be used for previewing the design-time HTML markup. (Inherited from ControlDesigner)
ViewControlCreated	Gets or sets a value indicating whether a View control has been created for display on the design surface. (Inherited from ControlDesigner)
Visible	Gets a value that indicates whether the control is visible at design time. (Inherited from ControlDesigner)

Methods

Configure()	Displays the Configure Data Source wizard on the visual designer surface.
CreateErrorDesignTimeHtml(String, Exception)	Creates the HTML markup to display a specified exception error message at design time. (Inherited from ControlDesigner)
CreateErrorDesignTimeHtml(String)	Creates HTML markup to display a specified error message at design time. (Inherited from ControlDesigner)
CreatePlaceHolderDesignTimeHtml()	Provides a simple rectangular placeholder representation that displays the type and ID of the control. (Inherited from ControlDesigner)
CreatePlaceHolderDesignTimeHtml(String)	Provides a simple rectangular placeholder representation that displays the type and ID of the control, and also additional specified instructions or information. (Inherited from ControlDesigner)
CreateViewControl()	Returns a copy of the associated control for viewing or rendering on the design surface. (Inherited from ControlDesigner)
Dispose()	Releases all resources used by the ComponentDesigner. (Inherited from ComponentDesigner)
Dispose(Boolean)	Releases the unmanaged resources that are used by the HtmlControlDesigner object and optionally releases the managed resources. (Inherited from HtmlControlDesigner)
DoDefaultAction()	Creates a method signature in the source code file for the default event on the component and navigates the user's cursor to that location. (Inherited from ComponentDesigner)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetBounds()	Retrieves the coordinates of the rectangle representing the boundaries for the control as displayed on the design surface. (Inherited from ControlDesigner)
GetDesignTimeHtml()	Retrieves the HTML markup for displaying the associated data source control at design time. (Inherited from DataSourceDesigner)
GetDesignTimeHtml(DesignerRegionCollection)	Retrieves the HTML markup to display the control and populates the collection with the current control designer regions. (Inherited from ControlDesigner)
GetEditableDesignerRegionContent(EditableDesignerRegion)	Returns the content for an editable region of the design-time view of the associated control. (Inherited from ControlDesigner)
GetEmptyDesignTimeHtml()	Retrieves the HTML markup to represent a Web server control at design time that will have no visual representation at run time. (Inherited from ControlDesigner)
GetErrorDesignTimeHtml(Exception)	Retrieves the HTML markup that provides information about the specified exception. (Inherited from ControlDesigner)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetPersistenceContent()	Retrieves the persistable inner HTML markup of the control at design time. (Inherited from ControlDesigner)
GetPersistInnerHtml()	Obsolete. Retrieves the persistable inner HTML markup of the control. (Inherited from ControlDesigner)
GetService(Type)	Attempts to retrieve the specified type of service from the design mode site of the designer's component. (Inherited from ComponentDesigner)
GetType()	Gets the Type of the current instance. (Inherited from Object)
GetView(String)	Returns a data source view with the specified name.
GetViewNames()	Returns a list of data source view names for the associated control.
GetViewRendering()	Retrieves an object that contains the design-time markup for the content and regions of the associated control. (Inherited from ControlDesigner)
Initialize(IComponent)	Initializes the control designer and loads the specified component. (Inherited from ControlDesigner)
InitializeExistingComponent(IDictionary)	Reinitializes an existing component. (Inherited from ComponentDesigner)
InitializeNewComponent(IDictionary)	Initializes a newly created component. (Inherited from ComponentDesigner)
InitializeNonDefault()	Obsolete. Initializes the settings for an imported component that is already initialized to settings other than the defaults. (Inherited from ComponentDesigner)
Invalidate()	Invalidates the whole area of the control that is displayed on the design surface and signals the control designer to redraw the control. (Inherited from ControlDesigner)
Invalidate(Rectangle)	Invalidates the specified area of the control that is displayed on the design surface and signals the control designer to redraw the control. (Inherited from ControlDesigner)
InvokeGetInheritanceAttribute(ComponentDesigner)	Gets the InheritanceAttribute of the specified ComponentDesigner. (Inherited from ComponentDesigner)
IsPropertyBound(String)	Obsolete. Retrieves a value indicating whether the specified property on the associated control is data-bound. (Inherited from ControlDesigner)
Localize(IDesignTimeResourceWriter)	Uses the provided resource writer to persist the localizable properties of the associated control to a resource in the design host. (Inherited from ControlDesigner)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
OnAutoFormatApplied(DesignerAutoFormat)	Called when a predefined, automatic formatting scheme has been applied to the associated control. (Inherited from ControlDesigner)
OnBehaviorAttached()	Called when the control designer is attached to a Behavior object. (Inherited from ControlDesigner)
OnBehaviorDetaching()	Obsolete. Called when a behavior disassociates from the element. (Inherited from HtmlControlDesigner)
OnBindingsCollectionChanged(String)	Obsolete. Called when the data-binding collection changes. (Inherited from ControlDesigner)
OnClick(DesignerRegionMouseEventArgs)	Called by the design host when the user clicks the associated control at design time. (Inherited from ControlDesigner)
OnComponentChanged(Object, ComponentChangedEventArgs)	Called when the associated control changes. (Inherited from ControlDesigner)
OnComponentChanging(Object, ComponentChangingEventArgs)	Represents the method that will handle the ComponentChanging event for the associated control. (Inherited from ControlDesigner)
OnControlResize()	Obsolete. Called when the associated Web server control has been resized in the design host at design time. (Inherited from ControlDesigner)
OnDataSourceChanged(EventArgs)	Raises the DataSourceChanged event when the properties of the data source have changed and the SuppressingDataSourceEvents value is false. (Inherited from DataSourceDesigner)
OnPaint(PaintEventArgs)	Called when the control designer draws the associated control on the design surface, if the CustomPaint value is true. (Inherited from ControlDesigner)
OnSchemaRefreshed(EventArgs)	Raises the SchemaRefreshed event when the schema of the data source has changed and the SuppressingDataSourceEvents value is false. (Inherited from DataSourceDesigner)
OnSetComponentDefaults()	Obsolete. Sets the default properties for the component. (Inherited from ComponentDesigner)
OnSetParent()	Provides a way to perform additional processing when the associated control is attached to a parent control. (Inherited from HtmlControlDesigner)
PostFilterAttributes(IDictionary)	Allows a designer to change or remove items from the set of attributes that it exposes through a TypeDescriptor. (Inherited from ComponentDesigner)
PostFilterEvents(IDictionary)	Allows a designer to change or remove items from the set of events that it exposes through a TypeDescriptor. (Inherited from ComponentDesigner)
PostFilterProperties(IDictionary)	Allows a designer to change or remove items from the set of properties that it exposes through a TypeDescriptor. (Inherited from ComponentDesigner)
PreFilterAttributes(IDictionary)	Allows a designer to add to the set of attributes that it exposes through a TypeDescriptor. (Inherited from ComponentDesigner)
PreFilterEvents(IDictionary)	Sets the list of events that are exposed at design-time for the TypeDescriptor object for the component. (Inherited from HtmlControlDesigner)
PreFilterProperties(IDictionary)	Used by the designer to remove properties from or add additional properties to the display in the Properties grid or to shadow properties of the associated control.
RaiseComponentChanged(MemberDescriptor, Object, Object)	Notifies the IComponentChangeService that this component has been changed. (Inherited from ComponentDesigner)
RaiseComponentChanging(MemberDescriptor)	Notifies the IComponentChangeService that this component is about to be changed. (Inherited from ComponentDesigner)
RaiseResizeEvent()	Obsolete. Raises the OnControlResize() event. (Inherited from ControlDesigner)
RefreshSchema(Boolean)	Extracts the metadata for the Select method from the business object that is specified by the associated control.
RegisterClone(Object, Object)	Registers internal data in a cloned control. (Inherited from ControlDesigner)
ResumeDataSourceEvents()	Restores data source events after the data source events have been suppressed. (Inherited from DataSourceDesigner)
SetEditableDesignerRegionContent(EditableDesignerRegion, String)	Specifies the content for an editable region of the control at design time. (Inherited from ControlDesigner)
SetRegionContent(EditableDesignerRegion, String)	Specifies the content for an editable region in the design-time view of the control. (Inherited from ControlDesigner)
SetViewFlags(ViewFlags, Boolean)	Assigns the specified bitwise ViewFlags enumeration to the specified flag value. (Inherited from ControlDesigner)
SuppressDataSourceEvents()	Postpones all data source events until after the ResumeDataSourceEvents() method is called. (Inherited from DataSourceDesigner)
ToString()	Returns a string that represents the current object. (Inherited from Object)
UpdateDesignTimeHtml()	Refreshes the design-time HTML markup for the associated Web server control by calling the GetDesignTimeHtml method. (Inherited from ControlDesigner)

Events

DataSourceChanged	Occurs when any property of the associated data source changes. (Inherited from DataSourceDesigner)
SchemaRefreshed	Occurs after the schema has been refreshed. (Inherited from DataSourceDesigner)

Explicit Interface Implementations

IDesignerFilter.PostFilterAttributes(IDictionary)	For a description of this member, see the PostFilterAttributes(IDictionary) method. (Inherited from ComponentDesigner)
IDesignerFilter.PostFilterEvents(IDictionary)	For a description of this member, see the PostFilterEvents(IDictionary) method. (Inherited from ComponentDesigner)
IDesignerFilter.PostFilterProperties(IDictionary)	For a description of this member, see the PostFilterProperties(IDictionary) method. (Inherited from ComponentDesigner)
IDesignerFilter.PreFilterAttributes(IDictionary)	For a description of this member, see the PreFilterAttributes(IDictionary) method. (Inherited from ComponentDesigner)
IDesignerFilter.PreFilterEvents(IDictionary)	For a description of this member, see the PreFilterEvents(IDictionary) method. (Inherited from ComponentDesigner)
IDesignerFilter.PreFilterProperties(IDictionary)	For a description of this member, see the PreFilterProperties(IDictionary) method. (Inherited from ComponentDesigner)
ITreeDesigner.Children	For a description of this member, see the Children property. (Inherited from ComponentDesigner)
ITreeDesigner.Parent	For a description of this member, see the Parent property. (Inherited from ComponentDesigner)

See also

• ObjectDataSource
• DataSourceControl
• DataSourceDesigner
• ControlDesigner
• HtmlControlDesigner
• ComponentDesigner
• Introduction to ASP.NET Control Designers
• Walkthrough: Creating a Basic Control Designer for a Web Server Control