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Old March 16th, 2005, 02:24 AM
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Default PropertyGrid - Internet Explorer hosting problem


I have created a Windows UserControl. This Control hosts a PropertyGrid and a Button

control. The UserControl
project also includes a class called "TestClass" and a custom TypeConvertor class called


When the user clicks on the Button control, the application assigns an instance of

"TestClass" to the PropertyGrid.

The "TestClass" has a property called "CustProp" and it has an TypeConverter attribute

assigned to
the "CustProp" property. The TypeConvertor points to the "DDConv" class.

The PropertyGrid in the UserControl displays a DropDown against the "CustProp" property when

the UserControl is
hosted in a windows application.

When the UserControl is hosted in Internet Explorer, the PropertyGrid does NOT SHOW any

DropDown for the "CustProp"

NOTE: I test the UserControl in Internet Explorer from a virtual directory on my machine. I

have set "FullTrust" for
the "LocalIntranet_Zone" on my machine.

I want the PropertyGrid to display the DropDown in Internet Explorer - can someone help me

in figuring out how to
acheive the same?

Public Class TestClass
    Dim _name As String
    Dim _ddProp As String

    Public Property Name() As String
            Return _name
        End Get
        Set(ByVal Value As String)
            _name = Value
        End Set
    End Property

    <System.ComponentModel.TypeConverter(GetType(DDCon v))> _
    Public Property CustProp() As String
            Return _ddProp
        End Get
        Set(ByVal Value As String)
            _ddProp = Value
        End Set
    End Property

End Class

Public Class DDConv
    Inherits System.ComponentModel.StringConverter

    Dim _values As String()
    Dim _restrictToList As Boolean

    Public Sub New()
        _values = New String() {"Yes", "No"}
    End Sub

    Public Overloads Overrides Function GetStandardValuesSupported(ByVal context As _
        System.ComponentModel.ITypeDescriptorContext) As Boolean

        Return True
    End Function

    Public Overloads Overrides Function GetStandardValues(ByVal context As

System.ComponentModel.ITypeDescriptorContext) _
        As System.ComponentModel.TypeConverter.StandardValues Collection

        Return New StandardValuesCollection(_values)

    End Function

    Public Overloads Overrides Function GetStandardValuesExclusive(ByVal context As _
        System.ComponentModel.ITypeDescriptorContext) As Boolean

        Return _restrictToList
    End Function
End Class

Thanks & Regards,
Dhwanil Shah

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  #2 (permalink)  
Old March 18th, 2005, 03:20 AM
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I "discovered" what was wrong with this - somehow IE was "looking" for the dll which had the TypeConverter - even when that was the DLL which exposed the UserControl that IE was hosting.

When the PropertyGrid tried to use a custom type converter - it tried to create an instance of a class from its fully qualified assembly name. While trying to create this instance, IE (or .NET Framework or PropertyGrid) tried to download the required DLL (again). IIS on the server kept on returning 401 (for whatever reason). That was the reason the TypeConverters were not working. I discovered all this by monitoring the requests and responses between IE and IIS (I used the Fiddler tool from Microsoft - available at http://www.fiddlertool.com)

While trying to resolve another problem in the application - I read Paul Wilsons blog at http://weblogs.asp.net/pwilson/archi...5/30/8037.aspx. In that Tim Clamp gave refrence regarding how to make IE / .NET Framework understand how to locate and download the assemblies. Based on that, I was able to give IE / .NET Framework absolute location for the .DLL that was being hosted by IE.

Refrences -

1. WinForm UserControls in Internet Explorer

2. PRB: Runtime Probe Causes a Delay When You Load a Windows Forms Control in Internet Explorer

Dhwanil Shah

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