DataListDesigner.GetDesignTimeHtml Método
Definição
public:
override System::String ^ GetDesignTimeHtml();
public override string GetDesignTimeHtml ();
override this.GetDesignTimeHtml : unit -> string
Public Overrides Function GetDesignTimeHtml () As String
Retornos
O HTML usado para representar o controle DataList em tempo de design.The HTML that is used to represent the DataList control at design time.
Exemplos
O exemplo de código a seguir mostra como substituir o GetDesignTimeHtml método.The following code example shows how to override the GetDesignTimeHtml method. Ele altera a aparência do controle na superfície de design se a propriedade do controle WebControl.Enabled for true .It alters the appearance of the control on the design surface if the control's WebControl.Enabled property is true.
O código usa a Try...Catch...Finally sintaxe para fazer o seguinte:The code uses Try...Catch...Finally syntax to do the following:
A
Tryseção altera os valores das propriedades do controle.TheTrysection changes the values of the properties of the control.A
Catchseção captura todas as exceções e as envia para o GetErrorDesignTimeHtml método.TheCatchsection catches any exceptions and sends them to the GetErrorDesignTimeHtml method.A
Finallyseção define as propriedades para seus valores originais.TheFinallysection sets the properties to their original values.
Este exemplo de código faz parte de um exemplo maior fornecido para a DataListDesigner classe.This code example is part of a larger example provided for the DataListDesigner class.
public override string GetDesignTimeHtml()
{
string designTimeHtml = String.Empty;
simpleGView = (SimpleGridView)Component;
// Check the control's BorderStyle property to
// conditionally render design-time HTML.
if (simpleGView.BorderStyle == BorderStyle.NotSet)
{
// Save the current property settings in variables.
int oldCellPadding = simpleGView.CellPadding;
Unit oldBorderWidth = simpleGView.BorderWidth;
Color oldBorderColor = simpleGView.BorderColor;
// Set properties and generate the design-time HTML.
try
{
simpleGView.Caption = "SimpleGridView";
simpleGView.CellPadding = 1;
simpleGView.BorderWidth = Unit.Pixel(3);
simpleGView.BorderColor = Color.Red;
designTimeHtml = base.GetDesignTimeHtml();
}
catch (Exception ex)
{
// Get HTML from the GetErrorDesignTimeHtml
// method if an exception occurs.
designTimeHtml = GetErrorDesignTimeHtml(ex);
// Return the properties to their original values.
}
finally
{
simpleGView.CellPadding = oldCellPadding;
simpleGView.BorderWidth = oldBorderWidth;
simpleGView.BorderColor = oldBorderColor;
}
}
else
{
designTimeHtml = base.GetDesignTimeHtml();
}
return designTimeHtml;
}
protected override string
GetErrorDesignTimeHtml(System.Exception exc)
{
return CreatePlaceHolderDesignTimeHtml(
"ASPNET.Examples: An error occurred while rendering the GridView.");
}
Public Overrides Function GetDesignTimeHtml() As String
Dim designTimeHtml As String = String.Empty
simpleGView = CType(Component, SimpleGridView)
' Check the control's BorderStyle property to
' conditionally render design-time HTML.
If (simpleGView.BorderStyle = BorderStyle.NotSet) Then
' Save the current property settings in variables.
Dim oldCellPadding As Integer = simpleGView.CellPadding
Dim oldBorderWidth As Unit = simpleGView.BorderWidth
Dim oldBorderColor As Color = simpleGView.BorderColor
' Set properties and generate the design-time HTML.
Try
simpleGView.Caption = "SimpleGridView"
simpleGView.CellPadding = 1
simpleGView.BorderWidth = Unit.Pixel(3)
simpleGView.BorderColor = Color.Red
designTimeHtml = MyBase.GetDesignTimeHtml()
Catch ex As Exception
' Get HTML from the GetErrorDesignTimeHtml
' method if an exception occurs.
designTimeHtml = GetErrorDesignTimeHtml(ex)
' Return the properties to their original values.
Finally
simpleGView.CellPadding = oldCellPadding
simpleGView.BorderWidth = oldBorderWidth
simpleGView.BorderColor = oldBorderColor
End Try
Else
designTimeHtml = MyBase.GetDesignTimeHtml()
End If
Return designTimeHtml
End Function
Protected Overrides Function _
GetErrorDesignTimeHtml(ByVal exc As Exception) As String
Return CreatePlaceHolderDesignTimeHtml( _
"ASPNET.Examples: An error occurred while rendering the GridView.")
End Function