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DetailsViewDesigner.GetDesignTimeHtml Method (DesignerRegionCollection)

Gets the markup that is used to render the associated control at design time and populates a collection of designer regions.

Namespace: System.Web.UI.Design.WebControls
Assembly: System.Design (in system.design.dll)

public override string GetDesignTimeHtml (
	DesignerRegionCollection regions
)
public String GetDesignTimeHtml (
	DesignerRegionCollection regions
)
public override function GetDesignTimeHtml (
	regions : DesignerRegionCollection
) : String
Not applicable.

Parameters

regions

A DesignerRegionCollection to which to add definitions of the selectable and clickable regions in the design-time view of the control.

Return Value

A String containing the markup used to render the DetailsView at design time.

The DetailsViewDesigner.GetDesignTimeHtml method calls the DetailsViewDesigner.GetDesignTimeHtml method to generate the markup for the design-time rendering of the DetailsView control. The DetailsViewDesigner.GetDesignTimeHtml method also populates regions with a DesignerRegion object for each clickable or selectable region of the design-time rendering.

For the DetailsView, the first cell in each row is selectable; all the cells in the rows are clickable.

Notes to Inheritors: If you override the GetDesignTimeHtml(DesignerRegionCollection) method, be sure to call the base method or the GetDesignTimeHtml overload because they eventually, through several override levels, call on the DetailsView control or a copy of the control to generate the markup.

The following code example shows how to override the GetDesignTimeHtml method in a class that is inherited from the DetailsViewDesigner class to change the appearance of the DetailsView control at design time. The example adds a new first row to the grid to contain the Caption property, if the Caption is defined. If the BorderStyle property of the control that is derived from the DetailsView is the NotSet or None value, the GetDesignTimeHtml draws a blue dashed border around the control to make its extent more visible. It does not change the run-time appearance of the control.

// Generate the design-time markup.
const string capTag = "caption";
const string trOpen = "tr><td colspan=2 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.
    MyDetailsView myDV = (MyDetailsView)Component;
    string markup = null;
    int charX;

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

        // Set design-time properties and catch any exceptions.
        try
        {
            myDV.BorderStyle = BorderStyle.Dashed;
            myDV.BorderWidth = Unit.Pixel(3);
            myDV.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.
            myDV.BorderStyle = oldBorderStyle;
            myDV.BorderWidth = oldBorderWidth;
            myDV.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=2 align=center".
        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

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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