DataGridDesigner.GetDesignTimeHtml 方法

public:
 override System::String ^ GetDesignTimeHtml();

public override string GetDesignTimeHtml();

override this.GetDesignTimeHtml : unit -> string

Public Overrides Function GetDesignTimeHtml () As String

返回

用于在设计时表示控件的 DataGrid HTML 标记。

示例

下面的代码示例演示如何重写 GetDesignTimeHtml 方法以更改设计图面上的控件的外观 DataGrid 。

该代码使用 Try...Catch...Finally 语法执行以下操作：

• 该 Try 节更改数据网格控件的属性的值。

• 该 Catch 部分捕获任何异常并将其发送到 GetErrorDesignTimeHtml 方法。

• 该 Finally 节将属性设置为其原始值。

此示例是DataGridDesigner类所提供的一个大型示例的一部分。

' 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

另请参阅

• GridView Web 服务器控件概述
• 扩展 Design-Time 支持
• 如何：在设计模式下扩展控件的外观和行为