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.NET Forum / ASP.NET / Building Controls / July 2006HierarchicalDataSourceControl Class and System.StackOverflowExcept
Hi When running the example code for the FileSystemDataSource which in found in the HierarchicalDataSourceControl Class documentation, I get a System.StackOverflowException. Can someone please help me solve this problem? http://msdn2.microsoft.com/en-us/library/system.web.ui.hierarchicaldatasourcecon trol.aspx Thank in advance Francis Francis, I've used that code as starting point for building a custom hierarchiacaldatasourcecontrol. Can you give the group a little more information on the error, like which line of code generated the error maybe. Thanks DWS > Hi > [quoted text clipped - 6 lines] > Thank in advance > Francis LS, The following must make it but it isn't an elegant way. I think there is an bug in designer. FileSystemDataSourceView fsdsv = new FileSystemDataSourceView(); TreeView1.DataSource = fsdsv.Select(); TreeView1.DataBind(); Greetz, Joey Chömpff Hi Yes, I tried that too, and it did work. As you said, the other way of dropping the controls in the designer doesn't work. I hope they fix it soon. Cheers Francis > LS, > [quoted text clipped - 8 lines] > > Joey Chömpff That's strange and you have implemented it in the pageload? I too had the same problems as you describe, and I noticed that wasn't alone... No help to find online. I solved it, and after doin so I sent the following email to:'DevDocs@microsoft.com' > (subject: Documentation Feedback:HierarchicalDataSourceContro Class > You seem to have an error in your documentation for the example o the HierarchicalDataSourceControl class > In the bottom part of the example you state > "The following code example demonstrates how to declaratively bind TreeView control to file system data using the FileSystemDataSourc example. > And then you erroneously repeat a previously defined class (Publi Class FileSystemDataSource) instead of showing the declarative synta and binding > Note: I had huge problems with getting your example working becaus of this. I made a search on the internet, and it seems I am not th only one to have problems. The reason for this is that since th declarative sample is missing, people set it up themselves. And th easiest declarative setup is to do as follows > <csp:FileSystemDataSource runat="server id="ds" / > <asp:TreeView runat="server id="CatSelector" DataSourceID="ds" / > But, this fails miserably! The first level data gets repeated fo each folder node, or sometimes worse you get a stack overflo (depending on the amount of files and folders in the app-root). Btw if you use a Menu instead of a TreeView it works. And that wa actually the hint needed to nail this one. I was finally able t narrow it down to the PopulateNodesFromClient property for th treeview. PopulateNodesFromClient is true by default, which mean that the Select will ask for each folder separately (dynamically) Since the example doesn't use the viewPath for it's select, it alway starts from the root. Given your example the solution is to explicitl set PopulateNodesFromClient to false in the declaration, like this > [code:1:1aa4889fea > <csp:FileSystemSetDataSource runat="server id="ds" / > <asp:TreeView runat="server id="CatSelector" DataSourceID="ds PopulateNodesFromClient="false" / > [/code:1:1aa4889fea > > BTW: It would be nice if you included an example of how to us viewPath in combination with the select as well. Then it would b easier to make hierarchical data-sources that allowed for dynamicall adding nodes (which is after all the default for the TreeVie control) This email should explain all you need to get this working Regards Ronn --------------------------------- http://community.ihostasp.ne ASP.NET Developer Community Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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