DataGridDesigner.GetDesignTimeHtml Method ()
Assembly: System.Design (in system.design.dll)
The following code example shows how to override the GetDesignTimeHtml method to alter the appearance of the DataGrid control on the design surface.
The code uses Try...Catch...Finally syntax to do the following:
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The Try section changes the values of the properties of the data grid control.
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The Catch section catches any exceptions and sends them to the GetErrorDesignTimeHtml method.
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The Finally section sets the properties to their original values.
This example is part of a larger example provided for the DataGridDesigner class.
' 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
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
Reference
DataGridDesigner ClassDataGridDesigner Members
System.Web.UI.Design.WebControls Namespace
Other Resources
GridView Web Server Control OverviewExtending Design-Time Support
How to: Extend the Appearance and Behavior of Controls in Design Mode
GridView Web Server Control Overview
Extending Design-Time Support
How to: Extend the Appearance and Behavior of Controls in Design Mode