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Questions tagged [invoke]

Executes the specified delegate on the thread that owns the control's underlying window handle.

The Invoke method searches up the control's parent chain until it finds a control or form that has a window handle if the current control's underlying window handle does not exist yet. If no appropriate handle can be found, the Invoke method will throw an exception.

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Why using Action in this code?

Hi I see following code: void UpdateMessage (string message) { Action action = () => txtMessage.Text = message; this.Invoke (action); } Why using Action and then invoke action here? Why not just using txtMessage.Text = message to replace…
spspli
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Deadlock when invoking the UI thread from a worker thread

I have a deadlock when I invoke the UI thread from a worker thread. Indeed, the worker thread is blocked on the invoke line: return (ucAvancementTrtFamille)mInterfaceTraitement.Invoke(d, new object[] { psFamille }); The weird thing is that the UI…
leo
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Is there a general "back-end" library for Java reflection

I'm currently working with a specialized, interpreted, programming language implemented in Java. As a very small part of the language, I'd like to add the ability to make calls into Java. Before I dive into all of the nitty-gritty of reflection, I…
Dave Ray
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PowerShell Pass Named parameters to ArgumentList

I have a PowerShell script that accepts 3 named parameters. Please let me know how to pass the same from command line. I tried below code but same is not working. It assigns the entire value to P3 only. My requirement is that P1 should contain 1, P2…
Parveen Kumar
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How does the event dispatch thread work?

With the help of people on stackoverflow I was able to get the following working code of a simple GUI countdown (which just displays a window counting down seconds). My main problem with this code is the invokeLater stuff. As far as I understand…
Roman
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Using reflection to invoke method on field

My code looks like the following: class MyObject { MyField f = new MyField(); } class MyField { public void greatMethod(); } Is there a way to invoke the greatMethod() using reflection on a object of the class MyObject? I tried the…
priojewo
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How do I dynamically invoke or call a class in Rails?

Assuming I can construct a string that matches an existing class, how do I invoke it? For example, I have several classes: MyClass1 MyClass2 MyClass3 And I want to dynamically invoke each of them by constructing a string that matches their names.…
comb
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How do I open a window on a new thread?

I have a options window and a window that displays color based on these options and Kinect data. So far everything's on one thread (as far as I know; I haven't done any threading). Now, I'm adding an option to open a viewer window that will need to…
mikey555
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Unable to access UNC Paths in Powershell remote session

I am unable to access the UNC paths on my servers in a Powershell remote session from my local machine. I am able to use them from Servers Cmd prompt directly. Actually, I have logged into the server and mapped a UNC path as local drive (say X:).…
user2610958
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How does delegate.Invoke work?

If I create a delegate in my code like : delegate void dostuff (string o); This generates a class that derives from System.MulticastDelegate which implements three methods - Invoke, BeginInvoke and EndInvoke. If I look at the compiled IL for Invoke…
Mongus Pong
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Why is `std::invoke` not constexpr?

Shouldn't std::invoke be constexpr especially after constexpr lambdas in C++17? Are there any obstacles that will prevent this?
Vahagn
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What's wrong with my cross-thread call in Windows Forms?

I encounter a problem with a Windows Forms application. A form must be displayed from another thread. So in the form class, I have the following code: private delegate void DisplayDialogCallback(); public void DisplayDialog() { if…
Arseni Mourzenko
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Calling ASP.net Web Service from C# Application

I have a question. How can i invoke a web service and get the result from a C# desktop application. I am making a desktop app and I want it to be able to connect to my online ASP.net web services. How is this possible?
QAH
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Debugging Invoked function in .NET

I call function in .NET using Reflection (Method.Invoke). If an error occurs inside this method and exception is raised, debugger doesn't show actual code but stops at Invoke() call. I can retrieve exception information from InnerException but this…
John
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C# : this.Invoke((MethodInvoker)delegate

can somebody explain me the following code please : this.Invoke((MethodInvoker)delegate { lblNCK.Text = cncType; }); Here is where it comes from : string cncType; …
Peter
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