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Scott F. Brown
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Cannot bind to an empty custom collection.
posted

  I have a custom business object that inherits from List<t> that I am binding to using ObjectDataSource.  It works great when there is data present.  However, if there is no data returned, I get the following error:

Data source contains no schema data.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NotSupportedException: Data source contains no schema data.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 

[NotSupportedException: Data source contains no schema data.]
   Infragistics.Web.UI.GridControls.WebDataGrid.DataBind() +678
   System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +82
   Infragistics.Web.UI.Framework.Data.FlatDataBoundControl.EnsureDataBound() +84
   Infragistics.Web.UI.GridControls.WebDataGrid.EnsureDataBound() +168
   Infragistics.Web.UI.GridControls.WebDataGrid.CreateChildControls() +43
   System.Web.UI.Control.EnsureChildControls() +87
   Infragistics.Web.UI.GridControls.WebDataGrid.EnsureChildControls() +113
   System.Web.UI.Control.PreRenderRecursiveInternal() +44
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842

 

I am completely stuck on this one.  Any help would be greatly appreciated.

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  • 380
    posted

    Hey, I just want to share that I had the same issue, here is the stack trace:

     

    [NotSupportedException: Data source contains no schema data.]
   Infragistics.Web.UI.GridControls.WebDataGrid.CopyFields() +799
   Infragistics.Web.UI.GridControls.WebDataGrid.FillFields() +186
   Infragistics.Web.UI.GridControls.WebDataGrid.DataBind() +803
   test.Page_Load(Object sender, EventArgs e) in c:\...
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

     

    In my case, the problem was my data source was a list of Order, for instance:

            List<Order> orders = new List<Order>();

            Order o;

            o = new Order();

            o.ID = 1;

            o.ClientCode = "Client1";

            o.Total = 22.99;

            orders.Add(o);

            o = new Order();

            o.ID = 1;

            o.ClientCode = "Client2";

            o.Total = 22.99;

            orders.Add(o);

     

    That here was the definition of my Order class:

        class Order

        {

            public int ID;

            public string ClientCode;

            public double Total;

        }

     

    The problem was with the members of the class Order, although public, were simply attributes, not methods... Here is what I had to do to solve the problem (promote them to methods):

        class Order

        {

            public int ID { get; set; }

            public string ClientCode { get; set; }

            public double Total { get; set; }

        }

    That worked just fine.

     

    -- Wagner

    http://www.wagnerdanda.me/

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