Binding to GridView

3 posts, 0 answers
  1. Russ
    Russ avatar
    49 posts
    Member since:
    Sep 2006

    Posted 18 Jun 2009 Link to this post

    I'm thinking of purchasing your controls for an upcoming project but I am getting a couple of errors that I'm hoping you can help me with.  I have a sample project available.

    1) The error below happens when I bind to the grid:
    System.ArgumentException: An item with the same key has already been added.
       at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
       at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
       at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
       at Telerik.WinControls.UI.GridTableElement.GetRowStyleForType(String elementTypeFullName)
       at Telerik.WinControls.UI.GridTableElement.GetRowStyle(GridRowElement row)
       at Telerik.WinControls.UI.GridRowElement.GetRowStyle()
       at Telerik.WinControls.UI.GridRowElement.ApplyCustomFormatting()
       at Telerik.WinControls.UI.GridRowElement.UpdateInfo()
       at Telerik.WinControls.UI.GridTableBodyElement.UpdateState()
       at Telerik.WinControls.UI.GridTableElement.UpdateCurrentColumn()
       at Telerik.WinControls.UI.GridViewTemplate.SetCurrentColumn(GridViewColumn column, Boolean update, Boolean shift, Boolean control)
       at Telerik.WinControls.UI.GridViewTemplate.set_CurrentColumn(GridViewColumn value)
       at Telerik.WinControls.UI.GridTableElement.UpdateCurrentPosition()
       at Telerik.WinControls.UI.GridViewInfo.SetCurrentRow(GridViewRowInfo row, Boolean setPosition, Boolean shift, Boolean control, Boolean rightMouseButton)
       at Telerik.WinControls.UI.GridViewTemplate.SetCurrentRow(GridViewRowInfo rowInfo)
       at Telerik.WinControls.Data.DataAccessComponent.InitDataGrid()
       at Telerik.WinControls.Data.DataAccessComponent.Bind(Object dataSource, String dataMember)
       at Telerik.WinControls.Data.DataAccessComponent.set_DataSource(Object value)
       at WindowsApplication4.Form1.worker_DoWork(Object sender, DoWorkEventArgs e) in c:\devprojects\WindowsApplication4\WindowsApplication4\Form1.vb:line 14
    2) The second error is Exception has been thrown by the target of an invocation. There is no clear way to reproduce. Sometimes it happens on startup, other times it me three or four clicks.
       at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
       at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
       at System.Delegate.DynamicInvokeImpl(Object[] args)
       at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
       at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
       at System.Threading.ExecutionContext.runTryCode(Object userData)
       at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
       at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
       at System.Windows.Forms.Control.WndProc(Message& m)
       at Telerik.WinControls.RadControl.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at WindowsApplication4.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()

    Please le tme know if you can help.
  2. Russ
    Russ avatar
    49 posts
    Member since:
    Sep 2006

    Posted 18 Jun 2009 Link to this post

    Here's the jist of the code



      Private Sub Form1_Load(ByVal sender As ObjectByVal e As System.EventArgs) Handles Me.Load  
        With Me.worker  
        End With 
      End Sub 
      Private Sub worker_DoWork(ByVal sender As ObjectByVal e As System.ComponentModel.DoWorkEventArgs) Handles worker.DoWork  
          Using db As New DataClasses1DataContext  
            db.Log = Console.Out  
            Dim q = From c In db.GetTable(Of candidate)() _  
                            Select c.candidate_num, c.first_name, c.last_name  
            Me.RadGridView1.DataSource = q  ''This throws error #1 from the original post.  I believe this is the same line causing error #2 but I'm unsure  
          End Using  
        Catch ex As Exception  
          Using sw As New System.IO.StreamWriter(My.Application.Info.DirectoryPath & "\LogFile.txt")  
          End Using  
        End Try 
      End Sub 
      Private Sub Clear_Click(ByVal sender As System.ObjectByVal e As System.EventArgs) Handles Clear.Click  
        Me.RadGridView1.DataSource = Nothing 
      End Sub 
      Private Sub Load_Click(ByVal sender As ObjectByVal e As System.EventArgs) Handles LoadData.Click  
        With Me.worker  
        End With 
      End Sub 


  3. Victor
    Victor avatar
    1358 posts

    Posted 19 Jun 2009 Link to this post

    Hello Russ,

    Thank you for writing.
    RadControls are not thread safe. You must employ locking constructs and synchronization logic if you need to access the grid from another thread. This is why exceptions get thrown.
    I have attached a sample application we prepared for another customer to demonstrate a way of doing this. It is in C#, but you can use this converter to convert the project code to VB in case you are not familiar with C#. Write again if you have other questions about our controls.

    Best wishes,
    the Telerik team

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