LoginDesigner.GetDesignTimeHtml(DesignerRegionCollection) 方法

定义

命名空间:

System.Web.UI.Design.WebControls

程序集:

System.Design.dll

获取用于在设计时呈现关联控件的标记，并填充设计器区域的集合。

public:
 override System::String ^ GetDesignTimeHtml(System::Web::UI::Design::DesignerRegionCollection ^ regions);

public override string GetDesignTimeHtml (System.Web.UI.Design.DesignerRegionCollection regions);

override this.GetDesignTimeHtml : System.Web.UI.Design.DesignerRegionCollection -> string

Public Overrides Function GetDesignTimeHtml (regions As DesignerRegionCollection) As String

参数

regions

DesignerRegionCollection

一个 DesignerRegionCollection，将在其中添加控件设计时视图中定义的可选择和可单击区域。

返回

String

一个字符串，其中包含用于在设计时呈现 Login 的标记。

示例

下面的代码示例演示如何重写 GetDesignTimeHtml 从 LoginDesigner 类继承的类中的 方法，以更改设计时派生自 控件的 Login 控件的外观。 如果 BorderStyle 控件的 属性为 NotSet 或 None 值，则本示例在控件周围绘制蓝色虚线边框，使其范围更可见。

// Generate the design-time markup.
public override string GetDesignTimeHtml()
{
    // Make the control more visible in the designer.  If the border 
    // style is None or NotSet, change the border to a blue dashed line. 
    MyLogin myLoginCtl = (MyLogin)ViewControl;
    string markup = null;

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

        // Set the design time properties and catch any exceptions.
        try
        {
            myLoginCtl.BorderStyle = BorderStyle.Dashed;
            myLoginCtl.BorderColor = Color.Blue;

            // Call the base method to generate the markup.
            markup = base.GetDesignTimeHtml();
        }
        catch (Exception ex)
        {
            markup = GetErrorDesignTimeHtml(ex);
        }
        finally
        {
            // It is not necessary to restore the border properties 
            // to their original values because the ViewControl 
            // was used to reference the associated control and the 
            // UsePreviewControl was not overridden.  

            // myLoginCtl.BorderStyle = oldBorderStyle;
            // myLoginCtl.BorderColor = oldBorderColor;
        }
    }
    else
    {
        // Call the base method to generate the markup.
        markup = base.GetDesignTimeHtml();
    }

    return markup;
} // GetDesignTimeHtml

' Generate the design-time markup.
Public Overrides Function GetDesignTimeHtml() As String

    ' Make the control more visible in the designer.  If the border 
    ' style is None or NotSet, change the border to a blue dashed line. 
    Dim myLoginCtl As MyLogin = CType(ViewControl, MyLogin)
    Dim markup As String = Nothing

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

        Dim oldBorderStyle As BorderStyle = myLoginCtl.BorderStyle
        Dim oldBorderColor As Color = myLoginCtl.BorderColor

        ' Set the design time properties and catch any exceptions.
        Try
            myLoginCtl.BorderStyle = BorderStyle.Dashed
            myLoginCtl.BorderColor = Color.Blue

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

        Catch ex As Exception
            markup = GetErrorDesignTimeHtml(ex)

        Finally
            ' It is not necessary to restore the border properties 
            ' to their original values because the ViewControl 
            ' was used to reference the associated control and the 
            ' UsePreviewControl was not overridden.  

            ' myLoginCtl.BorderStyle = oldBorderStyle
            ' myLoginCtl.BorderColor = oldBorderColor
        End Try

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

    Return markup

End Function ' GetDesignTimeHtml

注解

方法GetDesignTimeHtml为LayoutTemplate关联Login控件的 属性创建一个 EditableDesignerRegion 对象，并将其添加到 DesignerRegionCollection 参数regions引用的 对象。 方法 GetDesignTimeHtml 使用 GetDesignTimeHtml 基方法为控件的设计时呈现 Login 生成标记。

继承者说明

如果重写 GetDesignTimeHtml(DesignerRegionCollection) 方法，请务必调用 GetDesignTimeHtml() 基方法，因为它最终会通过多个重写级别调用 Login 控件或控件的副本来生成标记。

另请参阅

• Login
• LayoutTemplate
• EditableDesignerRegion
• DesignerRegionCollection
• GetDesignTimeHtml()