objectdisposedexception

问题 When implementing IDisposable, I undertand that every method that shouldn't be called after the object's been disposed should throw the ObjectDisposedException . But what is the standard for the name object that should be passed to the exception's constructor? 回答1: I believe the recommended practice is to throw the following: throw new ObjectDisposedException(GetType().FullName); Or including the check, these two lines of code at the top of each method that needs it (obviously not the Dispose

问题 I create a MemoryStream , pass it to CryptoStream for writing. I want the CryptoStream to encrypt, and leave the MemoryStream open for me to then read into something else. But as soon as CryptoStream is disposed, it disposes of MemoryStream too. Can CryptoStream leave the base MemoryStream open somehow? using (MemoryStream scratch = new MemoryStream()) { using (AesManaged aes = new AesManaged()) { // <snip> // Set some aes parameters, including Key, IV, etc. // </snip> ICryptoTransform

问题 I am using a .NET 4 SerialPort object to talk to a device attached to COM1. When I am done with the device, I call Close on the SerialPort. I do not call Dispose, but I believe that Close and Dispose are synonymous here. Usually this works just fine. Sometimes, however, I get the following exception some time later (The times I've seen range from 5 ms to 175 ms): System.ObjectDisposedException: Safe handle has been closed at System.Runtime.InteropServices.SafeHandle.DangerousAddRef(Boolean&

问题 I've read several things like this here but found no solution in my problem. I'm sending data from form1 to my tempGraph form. Everything is OK not until I close my tempGraph form and try to reopen it. as i try to reopen it says CANNOT ACCESS A DISPOSED OBJECT which is now my problem. How will I be able to open again my tempGraph? This is my code for sending data to different forms like my tempGraph: public void SetText(string text)//Set values to my textboxes { if (this.receive_tb

问题 I have a datagridview. This datagridview has customs datagridviewcolumns among other like datagridviewtextboxcolumns. Third-party control is hosted in each cell. So as datagridview is designed, on custom cells, content cannot be shown unless you are in cell's edit mode. So to achieve cells content to be shown I have overrided paint method in order to paint the cells when they are not in edit mode. The image to be painted in the cell is obtained in paint method and I use block like: using

问题 My game window has manual resizing allowed, which means it can be resized like any other normal window, by dragging its edges. The game also makes use of a RenderTarget2D rt2d , to which the main Render Target is set in the main Draw method: GraphicsDevice.SetRenderTarget(rt2d) , but it is reset back to null (the default render target) in the end of the main Draw method, which makes it a little bit confusing: is this really the source of the problem, resizing the game window right between the

问题 This question already has answers here : Why does Code Analysis tell me, “Do not dispose objects multiple times” here: (2 answers) Closed 3 years ago . When I select Analyze > RUn Code Analysis on Solution in Visual Studio 2013, I get, " CA2202 Do not dispose objects multiple times Object 'fs' can be disposed more than once in method 'RoboReporterSQL.SaveReportDataToDB(string, string)'. To avoid generating a System.ObjectDisposedException you should not call Dispose more than one time on an

问题 I have a stopwatch running in a different thread, that updates the GUI thread in a label to show as time goes by. When my program closes, it throws a ObjectDisposedException when I call this.Invoke(mydelegate); in the Form GUI to update the label with the time from the stopwatch. How do I get rid of this ObjectDisposedException ? I have tried to stop the stopwatch in the FormClosing Event, but it does not handle it. Here's the code: System.Diagnostics.Stopwatch sw = new System.Diagnostics

问题 I'm using this piece of code to process a connection to a server and read data from the client using(var client = _listener.EndAcceptTcpClient(ar)) { var clientStream = client.GetStream(); // Get the request message Messages.ReceiveMessage(clientStream, msg => ProcessRequest(msg, clientStream)); } Now, the ReceiveMessage method calls BeginRead() on the Stream passed as a parameter, but I'm getting an ObjectDisposedException. I know that a solution is to call stream.Dispose() when I don't need

问题 I have a C# WPF UI app, and when I close it, I always get a windows application-crash dialog ("UIDemo has encountered a problem and needs to close."). The error report indicates that it's a System.ObjectDisposedException which indicates that somewhere a method's being called on a disposed object. That's fine, I do understand that part. And I would love to fix it. I just can't get a stacktrace on the bastard. That exception is evading all of the following: my DispatcherUnhandledException