BaseValidatorDesigner.GetDesignTimeHtml 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。

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

public override string GetDesignTimeHtml ();

override this.GetDesignTimeHtml : unit -> string

Public Overrides Function GetDesignTimeHtml () As String

返回

String

一个字符串，其中包含用于在设计时呈现 BaseValidator 的标记。

示例

下面的代码示例演示如何重写 方法， GetDesignTimeHtml 该方法在设计时在关联的控件周围绘制实线边框，前提是控件的 BorderStyle 属性值设置为 NotSet 或 None 字段。

// Make the full extent of the control more visible in the designer.
// If the border style is None or NotSet, change the border to a 
// solid line. 
public override string GetDesignTimeHtml()
{
    // Get a reference to the control or a copy of the control.
    SimpleCompareValidator myCV = (SimpleCompareValidator)ViewControl;
    string markup = null;

    // Check if the border style should be changed.
    if (myCV.BorderStyle == BorderStyle.NotSet ||
        myCV.BorderStyle == BorderStyle.None)
    {
        // Save the current property setting.
        BorderStyle oldBorderStyle = myCV.BorderStyle;

        // Set the design-time property and catch any exceptions.
        try
        {
            myCV.BorderStyle = BorderStyle.Solid;

            // Call the base method to generate the markup.
            markup = base.GetDesignTimeHtml();
        }
        catch (Exception ex)
        {
            markup = GetErrorDesignTimeHtml(ex);
        }
        finally
        {
            // Restore the property to its original setting.
            myCV.BorderStyle = oldBorderStyle;
        }
    }
    else
    {
        // Call the base method to generate the markup.
        markup = base.GetDesignTimeHtml();
    }

    return markup;
} // GetDesignTimeHtml

' Make the full extent of the control more visible in the designer.
' If the border style is None or NotSet, change the border to a 
' solid line. 
Public Overrides Function GetDesignTimeHtml() As String

    ' Get a reference to the control or a copy of the control.
    Dim myCV As SimpleCompareValidator = _
        CType(ViewControl, SimpleCompareValidator)
    Dim markup As String

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

        ' Save the current property setting.
        Dim oldBorderStyle As BorderStyle = myCV.BorderStyle

        ' Set the design-time property and catch any exceptions.
        Try
            myCV.BorderStyle = BorderStyle.Solid

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

        Catch ex As Exception
            markup = GetErrorDesignTimeHtml(ex)

        Finally
            ' Restore the property to its original setting.
            myCV.BorderStyle = oldBorderStyle
        End Try

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

    Return markup
End Function

注解

ErrorMessage如果从 类派生BaseValidator的关联控件的 或 Text 属性是空字符串 (“”) ，或者如果Display属性设置为 None 字段，则 GetDesignTimeHtml 方法将ErrorMessage属性设置为控件 ID，该 ID 括在方括号 ([]) ，并将属性设置为Display字段Static。 GetDesignTimeHtml然后调用GetDesignTimeHtml基方法来生成标记，并在必要时将控件属性还原为其原始值。

另请参阅

• BaseValidator
• ErrorMessage
• Display
• ValidatorDisplay
• GetDesignTimeHtml()