TypeConverter in Web user control

Question

User1168546875 posted

I am developing a web user control and have a property exposed of type object. What I want is that when this user control is placed on a web form this property will pick up all the textboxes and give the user an option to choose from those values. Something very similar to what we've in CompareValidator where we get to choose the name of the control to compare etc.

Just to be more clear:
a.) On a web form I'll place my user control.
b.) User control has a property, TextBoxToFill.
c.) Developer will go into the property and then he should see a list of all the textboxes that are available on the current web form (where the user control has been placed).

What I've tried so far:
In a CustomCompareValidator I've put the attribute

 TypeConverter(GetType(ControlIDConverter)) 

before a property and that property is able to pick up all the available controls on the form where it has been placed. But when I put the same attribute in this user control it doesn't work. ANy idea why would it be so?<!-- / message -->

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Answer 1

User-1136466523 posted

Hi,

You can achieve that through ValidatedControlConverter. Try the following code snippet:

[TypeConverter(typeof(ValidatedControlConverter))]
        public string TextBoxToFill
        {

            get
            {
                object obj2 = this.ViewState["TextBoxToFill"];
                if (obj2 != null)
                {
                    return (string)obj2;
                }
                return string.Empty;
            }
            set
            {
                this.ViewState["TextBoxToFill"] = value;
            }
        }

Thanks.

Answer 2

User1168546875 posted

Thanks Jin for your response but that didn't work out. I am coding in VB.Net and below is what I implemented:

 

 <TypeConverter(GetType(ValidatedControlConverter))> _
    Public Property TextboxToFill() As String
        Get
            Dim obj As New Object
            obj = Me.ViewState("TextboxToFill")
            If Not obj Is Nothing Then
                Return obj.ToString
            End If
            Return String.Empty
        End Get
        Set(ByVal value As String)
            Me.ViewState("TextboxToFill") = value
        End Set
    End Property

 

One thing that I notice is that all Type converters belong to System.Web.UI.Webcontrols while my user control inherits from System.Web.UI.UserControl. Is that the reason this is not working out?

Thanks.

Answer 3

User-1136466523 posted

Hi,

Yes. It should be applied to Custom Server controls instead of the user control.

Thanks.