DataGridDesigner Class
Definition
Important
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Extends design-time behavior for the DataGrid Web server control.
public ref class DataGridDesigner : System::Web::UI::Design::WebControls::BaseDataListDesignerpublic class DataGridDesigner : System.Web.UI.Design.WebControls.BaseDataListDesigner[System.Web.UI.Design.SupportsPreviewControl(true)]
public class DataGridDesigner : System.Web.UI.Design.WebControls.BaseDataListDesignertype DataGridDesigner = class
inherit BaseDataListDesigner[<System.Web.UI.Design.SupportsPreviewControl(true)>]
type DataGridDesigner = class
inherit BaseDataListDesignerPublic Class DataGridDesigner
Inherits BaseDataListDesigner- Inheritance
- Attributes
Examples
The following code example demonstrates how to extend the DataGridDesigner class. The code overrides the GetDesignTimeHtml method to customize the CellPadding, BorderWidth, and BorderColor properties when the DataGrid control is rendered on a design surface.
Imports System.Diagnostics
Imports System.ComponentModel
Imports System.Drawing
Imports System.Web.UI.Design.WebControls
Imports System.Web.UI.WebControls
Namespace Examples.AspNet
' Create a designer class for the SimpleDataList class.
<System.Security.Permissions.SecurityPermission( _
System.Security.Permissions.SecurityAction.Demand, _
Flags:=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)> _
Public Class SimpleDataListDesigner
Inherits DataListDesigner
Private simpleList As SimpleDataList
' Override the GetDesignTimeHtml method to add style to the control
' on the design surface.
Public Overrides Function GetDesignTimeHtml() As String
' Cast the control to the Component property of the designer.
simpleList = CType(Component, SimpleDataList)
Dim designTimeHtml As String = Nothing
' Create variables to hold current property values.
Dim oldBorderWidth As Unit = simpleList.BorderWidth
Dim oldBorderColor As Color = simpleList.BorderColor
' Set the properties and generate the design-time HTML.
If (simpleList.Enabled) Then
Try
simpleList.BorderWidth = Unit.Point(5)
simpleList.BorderColor = Color.Purple
designTimeHtml = MyBase.GetDesignTimeHtml()
' Call the GetErrorDesignTimeHtml method if an
' exception occurs.
Catch ex As Exception
designTimeHtml = GetErrorDesignTimeHtml(ex)
' Return the properties to their original settings.
Finally
simpleList.BorderWidth = oldBorderWidth
simpleList.BorderColor = oldBorderColor
End Try
' If the list is not enabled, call the GetEmptyDesignTimeHtml
' method.
Else
designTimeHtml = GetEmptyDesignTimeHtml()
End If
Return designTimeHtml
End Function
Protected Overrides Function GetEmptyDesignTimeHtml() As String
Dim emptyText As String
' Check the CanEnterTemplateMode property to
' specify which text to display if ItemTemplate
' does not contain a value.
If CanEnterTemplateMode Then
emptyText = _
"<b>Either the Enabled property value is false " + _
"or you need to set the ItemTemplate for this " + _
"control.<br>Right-click to edit templates.</b>"
Else
emptyText = _
"<b>You cannot edit templates in this view.<br>" + _
"Switch to HTML view to define the ItemTemplate.</b>"
End If
Return CreatePlaceHolderDesignTimeHtml(emptyText)
End Function
' Generate HTML to indicate that an error has occurred.
Protected Overrides Function GetErrorDesignTimeHtml(ByVal exc As _
Exception) As String
Return CreatePlaceHolderDesignTimeHtml( _
"<b>An error occurred</b>.<br>Check to ensure that all " + _
"properties are valid.")
End Function
' Override the Initialize method to ensure that
' only an instance of the SimpleDataList class is
' used by this designer class.
Public Overrides Sub Initialize(ByVal component As IComponent)
simpleList = CType(component, SimpleDataList)
If IsNothing(simpleList) Then
Throw New ArgumentException("Must be a SimpleDataList.", "component")
End If
MyBase.Initialize(component)
End Sub
End Class
End Namespace
The following example shows how to use the DesignerAttribute attribute to associate the designer with the DataGrid control.
' Override the Initialize method to ensure that
' only an instance of the SimpleDataList class is
' used by this designer class.
Public Overrides Sub Initialize(ByVal component As IComponent)
simpleList = CType(component, SimpleDataList)
If IsNothing(simpleList) Then
Throw New ArgumentException("Must be a SimpleDataList.", "component")
End If
MyBase.Initialize(component)
End Sub
Constructors
| DataGridDesigner() |
Initializes a new instance of the DataGridDesigner class. |
Properties
| ActionLists |
Gets the designer action list collection for this designer. (Inherited from BaseDataListDesigner) |
| ActiveTemplateEditingFrame |
Obsolete.
Gets the active template editing frame. (Inherited from TemplatedControlDesigner) |
| 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 DesignerAutoFormatCollection object associated with this designer. |
| 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) |
| CanEnterTemplateMode |
Gets a value indicating whether or not this designer will allow the viewing or editing of templates. (Inherited from TemplatedControlDesigner) |
| 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 the designer allows data binding. (Inherited from TemplatedControlDesigner) |
| DataKeyField |
Gets or sets the value of the data key field of the associated control. (Inherited from BaseDataListDesigner) |
| DataMember |
Gets or sets the value of the data member field of the associated control. (Inherited from BaseDataListDesigner) |
| DataSource |
Gets or sets the value of the data source property of the associated control. (Inherited from BaseDataListDesigner) |
| DataSourceDesigner |
Gets the designer of the data source, when one is selected for data binding. (Inherited from BaseDataListDesigner) |
| DataSourceID |
Gets or sets the designer's version of the data source ID property and is used to shadow the corresponding property of the associated control. (Inherited from BaseDataListDesigner) |
| DesignerState |
Gets an object that is used to persist data for the associated control at design time. (Inherited from ControlDesigner) |
| DesignerView |
Gets the default view of the data source that is bound to the associated control. (Inherited from BaseDataListDesigner) |
| 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 |
Gets a value indicating whether loading must be complete to display the design-time markup. (Inherited from BaseDataListDesigner) |
| 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 control will be hidden when the control is placed into template editing mode. (Inherited from TemplatedControlDesigner) |
| 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 |
Obsolete.
Gets a value indicating whether the designer document is in template mode. (Inherited from TemplatedControlDesigner) |
| 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) |
| 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) |
| 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 a template definition. (Inherited from TemplatedControlDesigner) |
| 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 collection of verbs available to this designer. (Inherited from BaseDataListDesigner) |
| 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 |
| Visible |
Gets a value that indicates whether the control is visible at design time. (Inherited from ControlDesigner) |
Methods
| 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) |
| CreateTemplateEditingFrame(TemplateEditingVerb) |
Obsolete.
Creates a template editing frame using the specified verb. |
| 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 used by the DataGridDesigner object and optionally releases the managed resources. |
| 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) |
| EnterTemplateMode(ITemplateEditingFrame) |
Obsolete.
Opens a particular template frame object for editing in the designer. (Inherited from TemplatedControlDesigner) |
| Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
| ExitTemplateMode(Boolean, Boolean, Boolean) |
Obsolete.
Closes the currently active template editing frame after saving any relevant changes. (Inherited from TemplatedControlDesigner) |
| GetBounds() |
Retrieves the coordinates of the rectangle representing the boundaries for the control as displayed on the design surface. (Inherited from ControlDesigner) |
| GetCachedTemplateEditingVerbs() |
Obsolete.
Gets the cached template editing verbs available to the designer. |
| GetDesignTimeDataSource(IEnumerable, Int32, Boolean) |
Generates an object that can be used as a data source at design time. (Inherited from BaseDataListDesigner) |
| GetDesignTimeDataSource(Int32, Boolean) |
Generates an object that can be used as a data source at design time. (Inherited from BaseDataListDesigner) |
| GetDesignTimeHtml() |
Gets the HTML markup used to represent the DataGrid control at design time. |
| 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() |
Gets the HTML markup used to represent an empty template-based control at design time. |
| GetErrorDesignTimeHtml(Exception) |
Gets the HTML markup displayed at design time for the specified exception when an error has been encountered while rendering the control. |
| 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() |
Gets the markup to persist for the content that is in the associated server control runtime. (Inherited from TemplatedControlDesigner) |
| GetResolvedSelectedDataSource() |
Gets the data source component from the associated control container, resolved to a specific data member. (Inherited from BaseDataListDesigner) |
| GetSelectedDataSource() |
Gets the data source component from the associated control container. (Inherited from BaseDataListDesigner) |
| GetService(Type) |
Attempts to retrieve the specified type of service from the design mode site of the designer's component. (Inherited from ComponentDesigner) |
| GetTemplateContainerDataItemProperty(String) |
Obsolete.
Gets the data item property of the template container. |
| GetTemplateContainerDataSource(String) |
Obsolete.
Gets the data source of the template's container. (Inherited from BaseDataListDesigner) |
| GetTemplateContent(ITemplateEditingFrame, String, Boolean) |
Obsolete.
Gets the content of the template. |
| GetTemplateEditingVerbs() |
Obsolete.
Gets the template editing verbs available to the designer. (Inherited from TemplatedControlDesigner) |
| GetTemplateFromText(String) |
Creates a template from the specified text. (Inherited from TemplatedControlDesigner) |
| GetTemplatePropertyParentType(String) |
Obsolete.
Gets the Type object corresponding to the parent of the specified template. |
| GetTextFromTemplate(ITemplate) |
Gets a string of text that represents the specified template. (Inherited from TemplatedControlDesigner) |
| GetType() |
Gets the Type of the current instance. (Inherited from Object) |
| 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 designer with the specified DataGrid control. |
| InitializeExistingComponent(IDictionary) |
Reinitializes an existing component. (Inherited from ComponentDesigner) |
| InitializeNewComponent(IDictionary) |
Initializes a newly created component. (Inherited from ComponentDesigner) |
| InitializeNonDefault() |
Obsolete.
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) |
| InvokePropertyBuilder(Int32) |
Invokes a component editor for the associated control. (Inherited from BaseDataListDesigner) |
| 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) |
| OnAutoFormat(Object, EventArgs) |
Obsolete.
Handles the |
| OnAutoFormatApplied(DesignerAutoFormat) |
Called when an automatic formatting scheme has been applied to the associated control. (Inherited from BaseDataListDesigner) |
| OnBehaviorAttached() |
Obsolete.
Provides an opportunity to perform additional processing when a behavior is attached to the designer. (Inherited from TemplatedControlDesigner) |
| 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) |
| OnColumnsChanged() |
Called when the columns of the template change. |
| OnComponentChanged(Object, ComponentChangedEventArgs) |
Called when there is a change to the associated control. (Inherited from BaseDataListDesigner) |
| 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() |
Called when the data source for the associated control has changed. (Inherited from BaseDataListDesigner) |
| OnPaint(PaintEventArgs) |
Called when the control designer draws the associated control on the design surface, if the CustomPaint value is |
| OnPropertyBuilder(Object, EventArgs) |
Represents the method that handles the property-builder event. (Inherited from BaseDataListDesigner) |
| OnSchemaRefreshed() |
Called when the schema of the data source for the associated control changes. (Inherited from BaseDataListDesigner) |
| OnSetComponentDefaults() |
Obsolete.
Obsolete.
Sets the default properties for the component. (Inherited from ComponentDesigner) |
| OnSetParent() |
Provides an opportunity to perform additional processing when the parent of this designer is changed. (Inherited from TemplatedControlDesigner) |
| OnStylesChanged() |
Can be overridden to implement functionality that should occur when a style of the associated control has changed. (Inherited from BaseDataListDesigner) |
| OnTemplateEditingVerbsChanged() |
Called when the template editing verbs change. |
| OnTemplateModeChanged() |
Provides an opportunity to perform additional processing when the template mode is changed. (Inherited from TemplatedControlDesigner) |
| 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. (Inherited from BaseDataListDesigner) |
| 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) |
| RegisterClone(Object, Object) |
Registers internal data in a cloned control. (Inherited from ControlDesigner) |
| SaveActiveTemplateEditingFrame() |
Saves the active template editing frame. (Inherited from TemplatedControlDesigner) |
| 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) |
| SetTemplateContent(ITemplateEditingFrame, String, String) |
Obsolete.
Sets the content for the specified template and frame. |
| SetViewFlags(ViewFlags, Boolean) |
Assigns the specified bitwise ViewFlags enumeration to the specified flag value. (Inherited from ControlDesigner) |
| ToString() |
Returns a string that represents the current object. (Inherited from Object) |
| UpdateDesignTimeHtml() |
Updates the design-time HTML. (Inherited from TemplatedControlDesigner) |
