Unable To Cast Object error when trying to populate ObjectListView control

Question

I have downloaded the ObjectListView.dll and added it as a reference into my VB.NET application. I have added it to my toolbox and added an ObjectListView control to my form. However, when I try and populate it, I get the following error:

Unable to cast object of type 'System.Windows.Forms.ListViewItem' to type 'BrightIdeasSoftware.OLVListItem'

My code snippet looks like so:

lsvOverdueCalls.Items.Add(tempDT.Rows(0)("id").ToString)
lsvOverdueCalls.Items(0).SubItems.Add(tempDT.Rows(0)("summary").ToString)
lsvOverdueCalls.Items(0).SubItems.Add(tempDT.Rows(0)("first_name").ToString)

Unsure if I'm doing something wrong. My applicaton is compiled under the full version of dot.net 4.5, not the client version as advised. Any help appreciated.

Update I noticed I get the following error in my debugger window but ONLY when moving the mouse over a ListViewItem:

A first chance exception of type 'System.InvalidCastException' occurred in ObjectListView.dll System.Transactions Critical: 0 : http://msdn.microsoft.com/TraceCodes/System/ActivityTracing/2004/07/Reliability/Exception/UnhandledUnhandled exceptionDrakeMon2.0.vshost.exeSystem.InvalidCastException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089Unable to cast object of type 'System.Windows.Forms.ListViewItem' to type 'BrightIdeasSoftware.OLVListItem'. at BrightIdeasSoftware.ObjectListView.GetItem(Int32 index) at BrightIdeasSoftware.ObjectListView.LowLevelHitTest(Int32 x, Int32 y)
at BrightIdeasSoftware.ObjectListView.OlvHitTest(Int32 x, Int32 y)
at BrightIdeasSoftware.ObjectListView.BuildCellEvent(CellEventArgs args, Point location) at BrightIdeasSoftware.ObjectListView.OnMouseMove(MouseEventArgs e) at System.Windows.Forms.Control.WmMouseMove(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ListView.WndProc(Message& m) at BrightIdeasSoftware.ObjectListView.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(IntPtr 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 System.Windows.Forms.Form.ShowDialog(IWin32Window owner) at DrakeMon2.frmNewDashboard.ToolStripMenuItem2_Click(Object sender, EventArgs e) in C:\Dropbox\VS Projects\DrakeMon v2.0\DrakeMon v2.0\frmNewDashboard.vb:line 986 at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea) at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ToolStrip.WndProc(Message& m) at System.Windows.Forms.ToolStripDropDown.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(IntPtr 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 DrakeMon2.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone() at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()System.InvalidCastException: Unable to cast object of type 'System.Windows.Forms.ListViewItem' to type 'BrightIdeasSoftware.OLVListItem'. at BrightIdeasSoftware.ObjectListView.GetItem(Int32 index) at BrightIdeasSoftware.ObjectListView.LowLevelHitTest(Int32 x, Int32 y)
at BrightIdeasSoftware.ObjectListView.OlvHitTest(Int32 x, Int32 y)
at BrightIdeasSoftware.ObjectListView.BuildCellEvent(CellEventArgs args, Point location) at BrightIdeasSoftware.ObjectListView.OnMouseMove(MouseEventArgs e) at System.Windows.Forms.Control.WmMouseMove(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ListView.WndProc(Message& m) at BrightIdeasSoftware.ObjectListView.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(IntPtr 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 System.Windows.Forms.Form.ShowDialog(IWin32Window owner) at DrakeMon2.frmNewDashboard.ToolStripMenuItem2_Click(Object sender, EventArgs e) in C:\Dropbox\VS Projects\DrakeMon v2.0\DrakeMon v2.0\frmNewDashboard.vb:line 986 at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea) at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ToolStrip.WndProc(Message& m) at System.Windows.Forms.ToolStripDropDown.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(IntPtr 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 DrakeMon2.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone() at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()

I'm assuming a threading issue, but I'm unsure why this control throws an error and a normal listview or even the BetterListView control doesn't. My form only contains this control and nothing else. And...like mentioned, it ONLY occurs if I try and move the mouse over a ListViewItem.

Thanks

Answer 1

You cannot do Add() on the ObjectListView like you do on a normal ListView. Instead, you need to call the SetObjects method on the ObjectListView instance, and pass it a list of items to add.

So in your case, create a List<Call> of the items to add (assuming your model is a Call class with id, summary and first_name fields, and then pass it on to the lsvOverdueCalls.SetObjects() like so.

var lstCalls = new List<Call>() 
                      { 
                        new Call() { 
                                     Id = tempDT.Rows(0)("id").ToString,
                                     Summary = tempDT.Rows(0)("summary").ToString,
                                     First_Name = tempDT.Rows(0)("first_name").ToString 
                                   }
                      };

lsvOverdueCalls.SetObjects(lstCalls);

And here's how your Call model should look like.

public class Call
{
    public string Id { get; set; }
    public string Summary { get; set; }
    public string First_Name { get; set; }
}