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FormViewDesigner Class

Definition

Provides design-time support in a visual designer for the FormView control.

public ref class FormViewDesigner : System::Web::UI::Design::WebControls::DataBoundControlDesigner
public class FormViewDesigner : System.Web.UI.Design.WebControls.DataBoundControlDesigner
type FormViewDesigner = class
    inherit DataBoundControlDesigner
Public Class FormViewDesigner
Inherits DataBoundControlDesigner
Inheritance

Examples

The following code example shows how to extend the FormViewDesigner class to change the appearance of controls that are derived from the FormView control at design time.

The example derives the MyFormView control from the FormView control. The MyFormView is simply a copy of the FormView. The example also derives the MyFormViewDesigner class from the FormViewDesigner and places a DesignerAttribute object for the MyFormViewDesigner on the MyFormView control.

The MyFormViewDesigner overrides the following items:

  • The SampleRowCount property to specify that the pager row for the design-time view of the MyFormView contain four page links.

  • The GetDesignTimeHtml method to include the Caption property, if it is specified, as a new first row in the MyFormView grid at design time. If the BorderStyle property of the MyFormView is the NotSet or None value, the GetDesignTimeHtml draws a blue dashed border around the control to make its extent more visible.

using System;
using System.Web;
using System.Drawing;
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 MyFormView is a copy of the FormView.
    [AspNetHostingPermission(SecurityAction.Demand, 
        Level = AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, 
        Level = AspNetHostingPermissionLevel.Minimal)]
    [Designer(typeof(Examples.CS.WebControls.Design.MyFormViewDesigner))]
    public class MyFormView : FormView
    {
    } // MyFormView

    // Override members of the FormViewDesigner.
    public class MyFormViewDesigner : FormViewDesigner
    {
        // Determines the number of design-time links in the pager row.
        protected override int SampleRowCount
        {
            get
            {
                // Render four links in the pager row.
                return 4;
            }
        } // SampleRowCount

        // Generate the design-time markup.
        const string capTag = "caption";
        const string trOpen = "tr><td colspan=9 align=center";
        const string trClose = "td></tr";

        public override string GetDesignTimeHtml()
        {
            // Make the full extent of the control more visible in the designer.
            // If the border style is None or NotSet, change the border to
            // a wide, blue, dashed line. Include the caption within the border.
            MyFormView myGV = (MyFormView)Component;
            string markup = null;
            int charX;

            // Check if the border style should be changed.
            if (myGV.BorderStyle == BorderStyle.NotSet ||
                myGV.BorderStyle == BorderStyle.None)
            {
                BorderStyle oldBorderStyle = myGV.BorderStyle;
                Unit oldBorderWidth = myGV.BorderWidth;
                Color oldBorderColor = myGV.BorderColor;

                // Set the design-time properties and catch any exceptions.
                try
                {
                    myGV.BorderStyle = BorderStyle.Dashed;
                    myGV.BorderWidth = Unit.Pixel(3);
                    myGV.BorderColor = Color.Blue;

                    // Call the base method to generate the markup.
                    markup = base.GetDesignTimeHtml();
                }
                catch (Exception ex)
                {
                    markup = GetErrorDesignTimeHtml(ex);
                }
                finally
                {
                    // Restore the properties to their original settings.
                    myGV.BorderStyle = oldBorderStyle;
                    myGV.BorderWidth = oldBorderWidth;
                    myGV.BorderColor = oldBorderColor;
                }
            }
            else
            {
                // Call the base method to generate the markup.
                markup = base.GetDesignTimeHtml();
            }

            // Look for a <caption> tag.
            if ((charX = markup.IndexOf(capTag)) > 0)
            {
                // Replace the first caption with 
                // "tr><td colspan=9 align=center".
                // It is okay if the colspan exceeds the 
                // number of columns in the table.
                markup = markup.Remove(charX,
                    capTag.Length).Insert(charX, trOpen);

                // Replace the second caption with "td></tr".
                if ((charX = markup.IndexOf(capTag, charX)) > 0)
                    markup = markup.Remove(charX,
                        capTag.Length).Insert(charX, trClose);
            }
            return markup;
        } // GetDesignTimeHtml
    } // MyFormViewDesigner
} // Examples.CS.WebControls.Design
Imports System.Web
Imports System.Drawing
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 MyFormView is a copy of the FormView.
    <AspNetHostingPermission(SecurityAction.Demand, _
        Level:=AspNetHostingPermissionLevel.Minimal)> _
    <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
        Level:=AspNetHostingPermissionLevel.Minimal)> _
    <Designer(GetType(Examples.VB.WebControls.Design.MyFormViewDesigner))> _
    Public Class MyFormView
        Inherits FormView
    End Class

    ' Override members of the FormViewDesigner.
    Public Class MyFormViewDesigner
        Inherits FormViewDesigner

        ' Determines the number of design-time links in the pager row.
        Protected Overrides ReadOnly Property SampleRowCount() As Integer
            Get
                ' Render four links in the pager row.
                Return 4
            End Get
        End Property ' SampleRowCount

        ' Generate the design-time markup.
        Private Const capTag As String = "caption"
        Private Const trOpen As String = "tr><td colspan=9 align=center"
        Private Const trClose As String = "td></tr"

        Public Overrides Function GetDesignTimeHtml() As String

            ' Make the full extent of the control more visible in the designer.
            ' If the border style is None or NotSet, change the border to
            ' a wide, blue, dashed line. Include the caption within the border.
            Dim myGV As MyFormView = CType(Component, MyFormView)
            Dim markup As String = Nothing
            Dim charX As Integer

            ' Check if the border style should be changed.
            If (myGV.BorderStyle = BorderStyle.NotSet Or _
                myGV.BorderStyle = BorderStyle.None) Then

                Dim oldBorderStyle As BorderStyle = myGV.BorderStyle
                Dim oldBorderWidth As Unit = myGV.BorderWidth
                Dim oldBorderColor As Color = myGV.BorderColor

                ' Set the design-time properties and catch any exceptions.
                Try
                    myGV.BorderStyle = BorderStyle.Dashed
                    myGV.BorderWidth = Unit.Pixel(3)
                    myGV.BorderColor = Color.Blue

                    ' Call the base method to generate the markup.
                    markup = MyBase.GetDesignTimeHtml()

                Catch ex As Exception
                    markup = GetErrorDesignTimeHtml(ex)

                Finally
                    ' Restore the properties to their original settings.
                    myGV.BorderStyle = oldBorderStyle
                    myGV.BorderWidth = oldBorderWidth
                    myGV.BorderColor = oldBorderColor
                End Try

            Else
                ' Call the base method to generate the markup.
                markup = MyBase.GetDesignTimeHtml()
            End If

            ' Look for a <caption> tag.
            charX = markup.IndexOf(capTag)
            If charX > 0 Then

                ' Replace the first caption with 
                ' "tr><td colspan=9 align=center".
                ' It is okay if the colspan exceeds the 
                ' number of columns in the table.
                markup = markup.Remove(charX, _
                    capTag.Length).Insert(charX, trOpen)

                ' Replace the second caption with "td></tr".
                charX = markup.IndexOf(capTag, charX)
                If charX > 0 Then
                    markup = markup.Remove(charX, _
                        capTag.Length).Insert(charX, trClose)
                End If
            End If

            Return markup

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

Remarks

In a visual designer, when you switch from Source to Design view, the markup source code that describes the FormView 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 properties of the FormViewDesigner class provide the following functionality:

  • The ActionLists property returns a DesignerActionListCollection object, which typically contains an object that is derived from the DesignerActionList class for each level in the inheritance tree of the designer.

  • The AutoFormats property returns a collection of formatting schemes for display in the Auto Format dialog box.

  • The TemplateGroups property returns a collection of template groups for the templates of the associated FormView.

  • The UsePreviewControl property always returns true, indicating that the designer creates a temporary copy of the associated FormView to generate the design-time markup.

The FormViewDesigner class methods provide the following functionality:

Constructors

FormViewDesigner()

Initializes a new instance of the FormViewDesigner class.

Properties

ActionLists

Gets the designer action list collection for this designer.

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 automatic formatting schemes for display in the Auto Format dialog box.

Behavior
Obsolete.

Gets or sets the DHTML behavior that is associated with the designer.

(Inherited from HtmlControlDesigner)
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)
DataMember

Gets the shadowed DataMember property of the underlying data-bound control.

(Inherited from DataBoundControlDesigner)
DataSource

Gets or sets the value of the DataSource property for the associated control.

(Inherited from BaseDataBoundControlDesigner)
DataSourceDesigner

Gets the designer of the data source of the underlying data-bound control.

(Inherited from DataBoundControlDesigner)
DataSourceID

Gets or sets the value of the DataSourceID property of the underlying BaseDataBoundControl object.

(Inherited from BaseDataBoundControlDesigner)
DesignerState

Gets an object that is used to persist data for the associated control at design time.

(Inherited from ControlDesigner)
DesignerView

Gets the DesignerDataSourceView object associated with the data source of this designer.

(Inherited from DataBoundControlDesigner)
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)
RenderOuterTable

Specifies whether the FormViewDesigner control uses an outer table container to apply inline CSS style rules.

RootDesigner

Gets the control designer for the Web Forms page that contains the associated control.

(Inherited from ControlDesigner)
SampleRowCount

Gets the number of sample rows for the associated control to display.

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 for the fields of the associated control.

UseDataSourcePickerActionList

Gets a value indicating whether the designer should include "Choose a data source" in its action list.

(Inherited from DataBoundControlDesigner)
UsePreviewControl

Gets a value indicating whether the designer should use a temporary copy rather than the actual control that is associated with the designer to generate the design-time markup.

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

ConnectToDataSource()

Disconnects events from the previous data source and connects them to the current data source.

(Inherited from DataBoundControlDesigner)
CreateDataSource()

Invokes the standard dialog box to create a new data source control, and sets the new data source control's ID to the DataSourceID property of the data-bound control.

(Inherited from DataBoundControlDesigner)
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)
DataBind(BaseDataBoundControl)

Binds the DataBoundControl object to the data source.

(Inherited from DataBoundControlDesigner)
DisconnectFromDataSource()

Disconnects the data-bound control from data source events.

(Inherited from DataBoundControlDesigner)
Dispose()

Releases all resources used by the ComponentDesigner.

(Inherited from ComponentDesigner)
Dispose(Boolean)

Releases the unmanaged resources used by the DataBoundControlDesigner object and optionally releases the managed resources.

(Inherited from DataBoundControlDesigner)
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)
GetDesignTimeDataSource()

Gets the design-time data source from either the associated DataSourceDesigner or the DataSource property.

(Inherited from DataBoundControlDesigner)
GetDesignTimeHtml()

Gets the markup that is used to render the associated 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 markup text that is used to render a placeholder for the associated control at design time.

GetErrorDesignTimeHtml(Exception)

Provides the markup that is used to render the control at design time when an error has occurred.

(Inherited from BaseDataBoundControlDesigner)
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)
GetSampleDataSource()

Gets dummy sample data to render the data-bound control on the design surface if sample data cannot be created from the DataSourceDesigner or DataSource properties.

(Inherited from DataBoundControlDesigner)
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)
GetViewRendering()

Retrieves an object that contains the design-time markup for the content and regions of the associated control.

(Inherited from ControlDesigner)
Initialize(IComponent)

Prepares the designer to view, edit, and design the associated 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)
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(Boolean)

Called when the data source of the associated BaseDataBoundControl object changes.

(Inherited from BaseDataBoundControlDesigner)
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()

Called when the schema of the data source for the associated control changes.

OnSetComponentDefaults()
Obsolete.
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)

Adds or removes properties in the properties grid in a design host at design time, or provides new design-time properties that might correspond to properties on the associated control.

PreFilterProperties(IDictionary)

Overridden by the designer to shadow run-time properties of the data-bound control with corresponding properties implemented by the designer.

(Inherited from DataBoundControlDesigner)
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)
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)
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)

Explicit Interface Implementations

IDataBindingSchemaProvider.CanRefreshSchema

For a description of this member, see CanRefreshSchema.

(Inherited from DataBoundControlDesigner)
IDataBindingSchemaProvider.RefreshSchema(Boolean)

For a description of this member, see RefreshSchema(Boolean).

(Inherited from DataBoundControlDesigner)
IDataBindingSchemaProvider.Schema

For a description of this member, see Schema.

(Inherited from DataBoundControlDesigner)
IDataSourceProvider.GetResolvedSelectedDataSource()

For a description of this member, see GetResolvedSelectedDataSource().

(Inherited from DataBoundControlDesigner)
IDataSourceProvider.GetSelectedDataSource()

For a description of this member, see GetSelectedDataSource().

(Inherited from DataBoundControlDesigner)
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)

Applies to

See also