LoginViewDesigner.GetEmptyDesignTimeHtml 方法

定义

如果当前模板未定义,获取在设计时呈现关联控件的占位符的标记。

protected:
 override System::String ^ GetEmptyDesignTimeHtml();
protected override string GetEmptyDesignTimeHtml ();
override this.GetEmptyDesignTimeHtml : unit -> string
Protected Overrides Function GetEmptyDesignTimeHtml () As String

返回

String

一个字符串,包含在设计图面上呈现到占位符的标记文本。

示例

下面的代码示例演示如何重写 GetEmptyDesignTimeHtmlLoginViewDesigner 类继承的类中的方法,以更改设计时派 LoginView 生自该类的控件的外观。 该示例为占位符生成标记,该标记包含为关联控件定义的所有 RoleGroup 对象的名称。

// Generate the design-time markup for the control 
// when the template is empty.
protected override string GetEmptyDesignTimeHtml()
{
    // Generate a design-time placeholder containing the names of all
    // the role groups.
    MyLoginView myLoginViewCtl = (MyLoginView)ViewControl;
    RoleGroupCollection roleGroups = myLoginViewCtl.RoleGroups;
    string roleNames = null;

    // If there are any role groups, form a string of their names.
    if (roleGroups.Count > 0)
    {
        roleNames = "Role Groups: <br />   " + 
            roleGroups[0].ToString();

        for( int rgX = 1; rgX < roleGroups.Count; rgX++ )
            roleNames += 
                "<br />   " + roleGroups[rgX].ToString();
    }
    return CreatePlaceHolderDesignTimeHtml( roleNames);
} // GetEmptyDesignTimeHtml
' Generate the design-time markup for the control 
' when the template is empty.
Protected Overrides Function GetEmptyDesignTimeHtml() As String

    ' Generate a design-time placeholder containing the names of all
    ' the role groups.
    Dim myLoginViewCtl As MyLoginView = CType(ViewControl, MyLoginView)
    Dim roleGroups As RoleGroupCollection = myLoginViewCtl.RoleGroups
    Dim RoleNames As String = Nothing
    Dim rgX As Integer

    ' If there are any role groups, form a string of their names.
    If roleGroups.Count > 0 Then

        roleNames = "Role Groups: <br />   " & _
            roleGroups(0).ToString()

        For rgX = 1 To roleGroups.Count - 1
            roleNames &= "<br />   " & _
                roleGroups(rgX).ToString()
        Next rgX
    End If

    Return CreatePlaceHolderDesignTimeHtml(roleNames)

End Function ' GetEmptyDesignTimeHtml

注解

该方法 GetEmptyDesignTimeHtml 首先设置字符串消息的格式,该消息指定关联 LoginView 控件的当前模板的名称,并指定模板为空。 然后,为 GetEmptyDesignTimeHtml 包含该消息的占位符生成标记。

适用于

另请参阅