XslTransformFileEditor Class

Provides a design-time user interface for selecting an XML transform file.

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

Public Class XslTransformFileEditor
	Inherits UrlEditor
Dim instance As XslTransformFileEditor

public class XslTransformFileEditor extends UrlEditor
public class XslTransformFileEditor extends UrlEditor
Not applicable.

An XslTransformFileEditor object is used at design time to select and edit a URL for a XML transform file (.xsl) and to assign the URL to a control property. For example, the XmlDataSource control uses the XslTransformFileEditor class at design time to set the value of the TransformFile property.

Use the EditorAttribute attribute to associate the XslTransformFileEditor with a property. When the associated property is edited on the design surface, the designer host calls the EditValue method. The EditValue method uses the BuildUrl method, which in turn displays a user interface for selecting the URL, and then returns the URL that is selected by the user. The GetEditStyle method indicates the display style of the user interface.

Derive a class from the XslTransformFileEditor to define a custom editor for an XML transform file URL property. For example, a derived class can override the EditValue method, and then call the BuildUrl method with a custom Filter or Caption value.

The following code example demonstrates how to associate an instance of the XslTransformFileEditor class with a property that is contained within a custom control. When the control property is edited on the design surface, the XslTransformFileEditor class allows the user interface to select and edit an XML transform file name for the property value.

Imports Microsoft.VisualBasic
Imports System
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Web.UI
Imports System.Web.UI.Design
Imports System.Web.UI.Design.WebControls
Imports System.Web.UI.WebControls
Imports System.IO

Namespace ControlDesignerSamples.VB

    ' Define a simple text control, derived from the 
    ' System.Web.UI.WebControls.Label class.

    <Designer(GetType(TextControlDesigner))> _
    Public Class SimpleTextControl
        Inherits Label

        ' Define a private member to store the file name value in the control.
        Private _filename As String = ""
        Private _internalText As String = ""

        ' Define the public XML transform file property.  Indicate that the
        ' property can be edited at design-time with the XslTransformFileEditor class.
        <EditorAttribute(GetType(System.Web.UI.Design.XslTransformFileEditor), _
                         GetType(System.Drawing.Design.UITypeEditor))> _
        Public Property TransformFileName() As String
                Return _filename
            End Get

            Set(ByVal value As String)
                _filename = value
            End Set
        End Property

        ' Define a property that returns the timestamp
        ' for the selected file.
        Public ReadOnly Property LastChanged() As String
                If Not _filename Is Nothing AndAlso _filename.Length > 0 Then
                    If File.Exists(_filename) Then
                        Dim lastChangedStamp As DateTime
                        lastChangedStamp = File.GetLastWriteTime(_filename)
                        Return lastChangedStamp.ToLongDateString()
                    End If
                End If

                Return String.Empty

            End Get

        End Property

        ' Override the control Text property, setting the default
        ' text to the LastChanged string value for the selected
        ' file name.  If the file name has not been set in the
        ' design view, then default to an empty string.
        Public Overrides Property Text() As String
                If _internalText.Length = 0 And LastChanged.Length > 0 Then
                    ' If the internally stored value hasn't been set,
                    ' and the file name property has been set,
                    ' return the last changed timestamp for the file.

                    _internalText = LastChanged
                End If
                Return _internalText
            End Get

            Set(ByVal value As String)
                If Not value Is Nothing AndAlso value.Length > 0 Then
                    _internalText = value
                    _internalText = String.Empty
                End If

            End Set
        End Property

    End Class
End Namespace


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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