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Question

Issues rendering UserControl using Server.Execute() in an ASMX web service

Answer 1

A:

You could change your GetControl() method as follows:

private string GetControl(String controlName, String ClassId)
{
    Page page = new Page();
    StringWriter writer = new StringWriter();
    page.Server.Execute(controlName, writer, false);
    return writer.ToString();
}

ichiban 2009-06-10 18:06:57

System.Web.UI.Page doesn't have any Execute() methods as far as I can tell. Do you mean `page.Server.Execute(controlName, writer, false)`?

Jeff Leonard 2009-06-10 18:49:00

Sorry. that's what I meant.

ichiban 2009-06-10 18:51:34

Unfortunately, that doesn't work for UserControls (.ascx). page.Server.Execute() only works for .aspx pages.

Jeff Leonard 2009-06-10 19:19:51

Answer 2

A:

Instead of using an asp.net hidden control on your user control, just use a regular html hidden input with the code tags <% %> to fill the data like this:

<input id="Hidden1"  type="hidden" value="<%= text %>"/>

"text" is a public variable in the code behind file.

This worked for me and didn't require a form with runat="server".

orandov 2009-07-02 19:30:30

Your idea won't work in this case. My example invokes the web service from the browser and replaces the hidden field with the returned content, in Javascript, at the client. <% %> is processed at the server.

Jeff Leonard 2009-07-17 20:20:11

Answer 3

+4 A:

Looks like the answer was buried in the comments for the ViewManager

You'll want a class that inherits from Page and overrides the check for server controls not in a form

public class FormlessPage : Page
{
 public override void VerifyRenderingInServerForm(Control control)
 {
 }
}

Then when you render the control, use

Page page = new FormlessPage();
UserControl ctl = (UserControl)page.LoadControl(controlName);
//etc

I'm assuming you'll lose the ability to have events firing from any controls rendered this way.

Bela 2009-07-08 20:19:59

I'm leaning towards accepting this answer, as it rings true, but I want to try it out first (which won't be for a few days).

Jeff Leonard 2009-07-17 20:06:39

Answer 4

A:

    <System.Web.Services.WebMethod()> _
Public Shared Function GetDetails(ByVal filename As String) As String
 Dim page As Page = New Page()
 Dim ctl As recDetails = CType(page.LoadControl("~/Controles/recDetails.ascx"), recDetails)
 ctl.FileName = filename

 page.EnableEventValidation = False
 Dim _form As New HtmlForm()
 page.Controls.Add(_form)
 _form.Controls.Add(ctl)

 Dim writer As New System.IO.StringWriter()
 HttpContext.Current.Server.Execute(page, writer, False)
 Dim output As String = writer.ToString()
 writer.Close()
 Return output
End Function

You add the Form dinamically

Javier Sanchez 2009-10-07 16:23:43

Answer 5

A:

<System.Web.Services.WebMethod()> _
Public Shared Function GetDetails(ByVal filename As String) As String
 Dim page As Page = New Page()
 Dim ctl As recDetails = CType(page.LoadControl("~/Controles/recDetails.ascx"), recDetails)
 ctl.FileName = filename

 page.EnableEventValidation = False
 Dim _form As New HtmlForm()
 page.Controls.Add(_form)
 _form.Controls.Add(ctl)

 Dim writer As New System.IO.StringWriter()
 HttpContext.Current.Server.Execute(page, writer, False)
 Dim output As String = writer.ToString()
 writer.Close()
 Return output
End Function

You add the Form dinamically

Jfsanchez2k 2009-10-07 16:28:07

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Issues rendering UserControl using Server.Execute() in an ASMX web service

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