CODEWITHSUNDEEP
c#winformsobjectdisposedexception
disasterkid
disasterkid

Reputation: 7278

Cannot access a disposed object on Program.cs Main method

I have a WinForm application with two different forms. If the first command line argument is "download", the Download form should appear. I get an ObjectDisposedException on the Application.Run(new Download(args)); line on the Main method of my program.

static class Program
{
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main(string[] args)
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        if (args.Length > 0)
            switch (args[0])
            {
                case "download":
                    if (args.Length == 4)
                        Application.Run(new Download(args));
                    break;
                default:
                    Application.Run(new ApsisRunner(args));
                    break;
            }
    }
}

enter image description here

Update: Exception stack trace

   at System.Windows.Forms.Control.CreateHandle()
   at System.Windows.Forms.Form.CreateHandle()
   at System.Windows.Forms.Control.get_Handle()
   at System.Windows.Forms.Control.SetVisibleCore(Boolean value)
   at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
   at System.Windows.Forms.Control.set_Visible(Boolean value)
   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.Application.Run(Form mainForm)
   at ApsisCampaignRunner.Program.Main(String[] args) in c:\Users\pedram.mobedi\Documents\GitHub\Postbag\ApsisCampaignRunner\Program.cs:line 31
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   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()

Upvotes: 1

Views: 3531

Answers (2)

quadroid
quadroid

Reputation: 8950

The code you posted is fine, but if a object disposed exception occures anywhere inside your Download class it is thrown up the call stack until where you see it (the main method),

The cause is that you try to set your form visible after you disposed it.

You can try to break on ObjectDisposed Exceptions and find the exact line it is thrown, you can do so under Debug -> Exceptions.

Upvotes: 1

Sarvesh Mishra
Sarvesh Mishra

Reputation: 2072

Are you doing something like this one in the Constructor of Download form?

enter image description here

The problem might be in code of Download Form. You should not close or dispose Form in the constructor.

Upvotes: 4

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