invoke

Best Way to Invoke Any Cross-Threaded Code?

由 北慕城南 提交于 2019-11-26 04:36:36
问题 I know that this question has been asked before, but I\'m looking for a way to: streamline the creation of safe cross-threaded code. reuse this code in any situation (no Windows Forms references). Here\'s what I have so far, but I want to remove the Windows Forms references. Any ideas? public delegate void SafeInvokeDelegate(System.Action action); public class SafeInvoke { private readonly System.Windows.Forms.Control _threadControl; public SafeInvoke() { _threadControl = new System.Windows

How to call a method stored in a HashMap? (Java) [duplicate]

由 余生长醉 提交于 2019-11-26 04:08:05
问题 This question already has answers here : Function pointers/delegates in Java? (9 answers) Closed 5 years ago . I have a list of commands (i, h, t, etc) that the user will be entering on a command line/terminal Java program. I would like to store a hash of command/method pairs: \'h\', showHelp() \'t\', teleport() So that I can have code something like: HashMap cmdList = new HashMap(); cmdList.put(\'h\', showHelp()); if(!cmdList.containsKey(\'h\')) System.out.print(\"No such command.\") else

What could cause java.lang.reflect.InvocationTargetException?

由 别来无恙 提交于 2019-11-26 01:44:23
问题 Well, I\'ve tried to understand and read what could cause it but I just can\'t get it: I have this somewhere in my code: try{ .. m.invoke(testObject); .. } catch(AssertionError e){ ... } catch(Exception e){ .. } Thing is that, when it tries to invoke some method it throws InvocationTargetException instead of some other expected exception (specifically ArrayIndexOutOfBoundsException ). As I actually know what method is invoked I went straight to this method code and added a try-catch block for

Invoke(Delegate)

由 ╄→гoц情女王★ 提交于 2019-11-26 01:29:35
问题 Can anybody please explain this statement written on this link Invoke(Delegate): Executes the specified delegate on the thread that owns the control\'s underlying window handle. Can anybody explain what this means (especially the bold one) I am not able to get it clearly 回答1: The answer to this question lies in how C# Controls work Controls in Windows Forms are bound to a specific thread and are not thread safe. Therefore, if you are calling a control's method from a different thread, you

Invoke(Delegate)

由 狂风中的少年 提交于 2019-11-26 00:33:18
Can anybody please explain this statement written on this link Invoke(Delegate): Executes the specified delegate on the thread that owns the control's underlying window handle. Can anybody explain what this means (especially the bold one) I am not able to get it clearly dash The answer to this question lies in how C# Controls work Controls in Windows Forms are bound to a specific thread and are not thread safe. Therefore, if you are calling a control's method from a different thread, you must use one of the control's invoke methods to marshal the call to the proper thread. This property can be

Reflection: How to Invoke Method with parameters

由 回眸只為那壹抹淺笑 提交于 2019-11-26 00:28:27
问题 I am trying to invoke a method via reflection with parameters and I get: object does not match target type If I invoke a method without parameters, it works fine. Based on the following code if I call the method Test(\"TestNoParameters\") , it works fine. However if I call Test(\"Run\") , I get an exception. Is something wrong with my code? My initial purpose was to pass an array of objects e.g. public void Run(object[] options) but this did not work and I tried something simpler e.g. string

Cross-thread operation not valid: Control 'textBox1' accessed from a thread other than the thread it was created on [duplicate]

由 为君一笑 提交于 2019-11-26 00:19:02
问题 This question already has answers here : Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on (21 answers) Closed 3 years ago . I want to send temperature value from a microcontroller using UART to C# interface and Display temperature on Label.Content . Here is my microcontroller code: while(1) { key_scan(); // get value of temp if (Usart_Data_Ready()) { while(temperature[i]!=0) { if(temperature[i]!=\' \') { Usart_Write(temperature[i]);

How do I invoke a Java method when given the method name as a string?

由 不羁岁月 提交于 2019-11-25 22:54:44
问题 If I have two variables: Object obj; String methodName = \"getName\"; Without knowing the class of obj , how can I call the method identified by methodName on it? The method being called has no parameters, and a String return value. It\'s a getter for a Java bean . 回答1: Coding from the hip, it would be something like: java.lang.reflect.Method method; try { method = obj.getClass().getMethod(methodName, param1.class, param2.class, ..); } catch (SecurityException e) { ... } catch

What's the difference between Invoke() and BeginInvoke()

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-11-25 22:02:21
问题 Just wondering what the difference between BeginInvoke() and Invoke() are? Mainly what each one would be used for. EDIT: What is the difference between creating a threading object and calling invoke on that and just calling BeginInvoke() on a delegate? or are they the same thing? 回答1: Do you mean Delegate.Invoke/BeginInvoke or Control.Invoke/BeginInvoke? Delegate.Invoke: Executes synchronously, on the same thread. Delegate.BeginInvoke: Executes asynchronously, on a threadpool thread. Control

Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on

由 别来无恙 提交于 2019-11-25 21:33:53
问题 I have a scenario. (Windows Forms, C#, .NET) There is a main form which hosts some user control. The user control does some heavy data operation, such that if I directly call the UserControl_Load method the UI become nonresponsive for the duration for load method execution. To overcome this I load data on different thread (trying to change existing code as little as I can) I used a background worker thread which will be loading the data and when done will notify the application that it has
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