LoginStatusDesigner.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

一个字符串，其中包含用于在设计时呈现 LoginStatus 的标记。

示例

下面的代码示例演示如何重写 GetDesignTimeHtml 从 LoginStatusDesigner 类继承的类中的 方法，以更改在设计时派生自 类的 LoginStatus 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. 
    MyLoginStatus myLoginStatusCtl = (MyLoginStatus)ViewControl;
    string markup = null;

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

        // Set the design time properties and catch any exceptions.
        try
        {
            myLoginStatusCtl.BorderStyle = BorderStyle.Dashed;
            myLoginStatusCtl.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 myLoginStatusCtl As MyLoginStatus = _
        CType(ViewControl, MyLoginStatus)
    Dim markup As String = Nothing

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

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

        ' Set the design time properties and catch any exceptions.
        Try
            myLoginStatusCtl.BorderStyle = BorderStyle.Dashed
            myLoginStatusCtl.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

LogoutText如果 或 LoginText 属性 (，具体取决于用户是登录) ，是 null、空字符串 (“”) ，还是单个空格 (“) ”，则GetDesignTimeHtml方法会根据需要将 或 LoginText 属性设置为LogoutTextID属性，将其括在方括号 (“[ ]”) 。 然后，无论 或 的设置LoginText如何，方法都会GetDesignTimeHtml调用GetDesignTimeHtml基方法，以便为控件的设计时呈现LoginStatus生成LogoutText标记。

继承者说明

如果重写 GetDesignTimeHtml() 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 LoginStatus 控件或控件的副本来生成标记。

适用于

另请参阅

• LoginStatus
• LoginText
• GetDesignTimeHtml()