GridViewDesigner.GetDesignTimeHtml 方法

参考

定义

命名空间:: System.Web.UI.Design.WebControls

程序集:: System.Design.dll

重要

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获取用于在设计时呈现关联的 GridView 控件的标记。

重载

GetDesignTimeHtml()	获取用于在设计时呈现关联控件的标记。
GetDesignTimeHtml(DesignerRegionCollection)	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。

GetDesignTimeHtml()

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

String

一个 String，其中包含用于在设计时呈现 GridView 的标记。

示例

下面的代码示例演示如何重写 GetDesignTimeHtml 从 GridViewDesigner 类继承的类中的方法，以在设计时更改控件的外观 GridView 。该示例在网格中添加一个新第一行，以包含 Caption 属性（如果 Caption 已定义）。 BorderStyle如果派生自 GridView 类的控件的属性具有 NotSet 或 None 值，则会GetDesignTimeHtml在控件周围绘制蓝色虚线边框，使其范围更可见。它不会更改控件的运行时外观。

// Generate the design-time markup.
const string capTag = "caption";
const string trOpen = "tr><td colspan=9 align=center";
const string trClose = "td></tr";

public override string 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 wide, blue, dashed line. Include the caption within the border.
    MyGridView myGV = (MyGridView)Component;
    string markup = null;
    int charX;

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

        // Set the design-time properties and catch any exceptions.
        try
        {
            myGV.BorderStyle = BorderStyle.Dashed;
            myGV.BorderWidth = Unit.Pixel(3);
            myGV.BorderColor = Color.Blue;

            // Call the base method to generate the markup.
            markup = base.GetDesignTimeHtml();
        }
        catch (Exception ex)
        {
            markup = GetErrorDesignTimeHtml(ex);
        }
        finally
        {
            // Restore the properties to their original settings.
            myGV.BorderStyle = oldBorderStyle;
            myGV.BorderWidth = oldBorderWidth;
            myGV.BorderColor = oldBorderColor;
        }
    }
    else
    {
        // Call the base method to generate the markup.
        markup = base.GetDesignTimeHtml();
    }

    // Look for a <caption> tag.
    if ((charX = markup.IndexOf(capTag)) > 0)
    {
        // Replace the first caption with 
        // "tr><td colspan=9 align=center".
        // It is okay if the colspan exceeds the 
        // number of columns in the table.
        markup = markup.Remove(charX,
            capTag.Length).Insert(charX, trOpen);

        // Replace the second caption with "td></tr".
        if ((charX = markup.IndexOf(capTag, charX)) > 0)
            markup = markup.Remove(charX,
                capTag.Length).Insert(charX, trClose);
    }
    return markup;
} // GetDesignTimeHtml

' Generate the design-time markup.
Private Const capTag As String = "caption"
Private Const trOpen As String = "tr><td colspan=9 align=center"
Private Const trClose As String = "td></tr"

Public Overrides Function GetDesignTimeHtml() As String

    ' 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 wide, blue, dashed line. Include the caption within the border.
    Dim myGV As MyGridView = CType(Component, MyGridView)
    Dim markup As String = Nothing
    Dim charX As Integer

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

        Dim oldBorderStyle As BorderStyle = myGV.BorderStyle
        Dim oldBorderWidth As Unit = myGV.BorderWidth
        Dim oldBorderColor As Color = myGV.BorderColor

        ' Set the design-time properties and catch any exceptions.
        Try
            myGV.BorderStyle = BorderStyle.Dashed
            myGV.BorderWidth = Unit.Pixel(3)
            myGV.BorderColor = Color.Blue

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

        Catch ex As Exception
            markup = GetErrorDesignTimeHtml(ex)

        Finally
            ' Restore the properties to their original settings.
            myGV.BorderStyle = oldBorderStyle
            myGV.BorderWidth = oldBorderWidth
            myGV.BorderColor = oldBorderColor
        End Try

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

    ' Look for a <caption> tag.
    charX = markup.IndexOf(capTag)
    If charX > 0 Then

        ' Replace the first caption with 
        ' "tr><td colspan=9 align=center".
        ' It is okay if the colspan exceeds the 
        ' number of columns in the table.
        markup = markup.Remove(charX, _
            capTag.Length).Insert(charX, trOpen)

        ' Replace the second caption with "td></tr".
        charX = markup.IndexOf(capTag, charX)
        If charX > 0 Then
            markup = markup.Remove(charX, _
                capTag.Length).Insert(charX, trClose)
        End If
    End If

    Return markup

End Function ' GetDesignTimeHtml

注解

GetDesignTimeHtml() 方法执行以下操作：

AutoGenerateColumns如果属性为空，则将控件的 Columns 属性设置为 true。
DataKeyNames如果无法获取数据源的架构，则将控件的属性设置为 null。
TypeDescriptor刷新对象以强制PreFilterProperties调用方法。
调用基方法以生成标记。

继承者说明

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

另请参阅

适用于

GetDesignTimeHtml(DesignerRegionCollection)

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。

String

一个 String，其中包含用于在设计时呈现 GridView 的标记。

示例

// Generate the design-time markup.
const string capTag = "caption";
const string trOpen = "tr><td colspan=9 align=center";
const string trClose = "td></tr";

public override string 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 wide, blue, dashed line. Include the caption within the border.
    MyGridView myGV = (MyGridView)Component;
    string markup = null;
    int charX;

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

        // Set the design-time properties and catch any exceptions.
        try
        {
            myGV.BorderStyle = BorderStyle.Dashed;
            myGV.BorderWidth = Unit.Pixel(3);
            myGV.BorderColor = Color.Blue;

            // Call the base method to generate the markup.
            markup = base.GetDesignTimeHtml();
        }
        catch (Exception ex)
        {
            markup = GetErrorDesignTimeHtml(ex);
        }
        finally
        {
            // Restore the properties to their original settings.
            myGV.BorderStyle = oldBorderStyle;
            myGV.BorderWidth = oldBorderWidth;
            myGV.BorderColor = oldBorderColor;
        }
    }
    else
    {
        // Call the base method to generate the markup.
        markup = base.GetDesignTimeHtml();
    }

    // Look for a <caption> tag.
    if ((charX = markup.IndexOf(capTag)) > 0)
    {
        // Replace the first caption with 
        // "tr><td colspan=9 align=center".
        // It is okay if the colspan exceeds the 
        // number of columns in the table.
        markup = markup.Remove(charX,
            capTag.Length).Insert(charX, trOpen);

        // Replace the second caption with "td></tr".
        if ((charX = markup.IndexOf(capTag, charX)) > 0)
            markup = markup.Remove(charX,
                capTag.Length).Insert(charX, trClose);
    }
    return markup;
} // GetDesignTimeHtml

' Generate the design-time markup.
Private Const capTag As String = "caption"
Private Const trOpen As String = "tr><td colspan=9 align=center"
Private Const trClose As String = "td></tr"

Public Overrides Function GetDesignTimeHtml() As String

    ' 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 wide, blue, dashed line. Include the caption within the border.
    Dim myGV As MyGridView = CType(Component, MyGridView)
    Dim markup As String = Nothing
    Dim charX As Integer

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

        Dim oldBorderStyle As BorderStyle = myGV.BorderStyle
        Dim oldBorderWidth As Unit = myGV.BorderWidth
        Dim oldBorderColor As Color = myGV.BorderColor

        ' Set the design-time properties and catch any exceptions.
        Try
            myGV.BorderStyle = BorderStyle.Dashed
            myGV.BorderWidth = Unit.Pixel(3)
            myGV.BorderColor = Color.Blue

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

        Catch ex As Exception
            markup = GetErrorDesignTimeHtml(ex)

        Finally
            ' Restore the properties to their original settings.
            myGV.BorderStyle = oldBorderStyle
            myGV.BorderWidth = oldBorderWidth
            myGV.BorderColor = oldBorderColor
        End Try

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

    ' Look for a <caption> tag.
    charX = markup.IndexOf(capTag)
    If charX > 0 Then

        ' Replace the first caption with 
        ' "tr><td colspan=9 align=center".
        ' It is okay if the colspan exceeds the 
        ' number of columns in the table.
        markup = markup.Remove(charX, _
            capTag.Length).Insert(charX, trOpen)

        ' Replace the second caption with "td></tr".
        charX = markup.IndexOf(capTag, charX)
        If charX > 0 Then
            markup = markup.Remove(charX, _
                capTag.Length).Insert(charX, trClose)
        End If
    End If

    Return markup

End Function ' GetDesignTimeHtml

注解

方法 GetDesignTimeHtml(DesignerRegionCollection) 调用 GetDesignTimeHtml() 方法，为控件的设计时呈现 GridView 生成标记。还会 GetDesignTimeHtml(DesignerRegionCollection) 为设计时呈现的每个可单击或可选择区域填充 regions 一个 DesignerRegion 对象。

对于， GridView可以选择每行中的第一个单元格;行中的所有单元格都可以单击。

继承者说明

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

另请参阅

适用于

通过

GridViewDesigner.GetDesignTimeHtml 方法

定义

重载

GetDesignTimeHtml()

返回

示例

注解

继承者说明

另请参阅

适用于

GetDesignTimeHtml(DesignerRegionCollection)

参数

返回

示例

注解

继承者说明

另请参阅

适用于

其他资源