I programmatically created a control and now want to get the rendered HTML as a string. How do I do it
I tried:
Dim MyRenderedOutput As String = ""
Dim SW As New System.IO.StringWriter(MyRenderedOutput)
Dim hstw As New HtmlTextWriter(SW)
MyControl.RenderControl(hstw)
But I get an Error:
System.InvalidCastException: Unable to cast object of type 'System.String' to type 'System.IFormatProvider'.
Your help is very much appreciated
Beat
Render Control to string
Bart_p
Many Thanks, Vikram.
Wounderful - It works well for TextBox, Labels, Dorpdown.
It does not work for TreeView.
I get the Error:
System.NullReferenceException: Object reference not set to an instance of an object.
What do I need to do for the more complex objects
Here is the code I tried:
Dim MyControl As New TreeView
MyControl.ToolTip = "My TreeVeiw Control"
MyControl.ID = "MyTVTest"
Dim NN As New TreeNode()
'newNode.PopulateOnDemand = True
NN.Text = "treenode TEXT 1"
NN.Value = "Treenode Value 1"
NN.ToolTip = "Treenode Tooltip 1"
MyControl.Nodes.Add(NN)
Dim sbHtmlContent As New System.Text.StringBuilder()
Dim objStringWriter As New System.IO.StringWriter(sbHtmlContent)
Dim objHtmlTextWriter As New HtmlTextWriter(objStringWriter)
MyControl.RenderControl(objHtmlTextWriter) <<<< Error occurs here
Dim strTextBoxHtml As String = sbHtmlContent.ToString()
Remark: As long as I do not add Nodes to the TreeView - it works well...
Beat
sdknewbie
Here's a code snippet based on .NET 2.0 B2 with VB 2005 - I am assuming a TextBox control...
-------------------------------------------------------------------
CODE SNIPPET
-------------------------------------------------------------------
Dim MyControl As New TextBox
Dim sbHtmlContent As New System.Text.StringBuilder()
Dim objStringWriter As New System.IO.StringWriter(sbHtmlContent)
Dim objHtmlTextWriter As New HtmlTextWriter(objStringWriter)
MyControl.RenderControl(objHtmlTextWriter)
Dim strTextBoxHtml As String = sbHtmlContent.ToString()
-------------------------------------------------------------------
Regards,
Vikram
Edimilson Simionato
You are correct - the same exception was re-created for me as well when I tried your code snippet. I'd recommend that you use a custom XML to store the Nodedata of a Treeview.
Regards,
Vikram
Please mark the reply as answer if it helped!