How to create an asynchronous method

c# asynchronous delegates
Prashant Cholachagudda picture Prashant Cholachagudda · Jul 21, 2009 · Viewed 91.3k times · Source

I have simple method in my C# app, it picks file from FTP server and parses it and stores the data in DB. I want it to be asynchronous, so that user perform other operations on App, once parsing is done he has to get message stating "Parsing is done".

I know it can achieved through asynchronous method call but I dont know how to do that can anybody help me please??

Answer

Callum Rogers picture Callum Rogers · Jul 21, 2009

You need to use delegates and the BeginInvoke method that they contain to run another method asynchronously. A the end of the method being run by the delegate, you can notify the user. For example:

class MyClass
{
    private delegate void SomeFunctionDelegate(int param1, bool param2);
    private SomeFunctionDelegate sfd;

    public MyClass()
    {
        sfd = new SomeFunctionDelegate(this.SomeFunction);
    }

    private void SomeFunction(int param1, bool param2)
    {
        // Do stuff

        // Notify user
    }

    public void GetData()
    {
        // Do stuff

        sfd.BeginInvoke(34, true, null, null);
    }
}

Read up at http://msdn.microsoft.com/en-us/library/2e08f6yc.aspx

Related questions

What's the method signature for passing an async delegate?

I've recently moved back to C# from being in Objective-C land, and the async/await keywords in C# 5 look cool. But I'm still trying to get a handle on the proper syntax. I want to declare a method that takes …

Read More
How to create an IAsyncResult that immediately completes?

I am implementing an interface which requires implementations of BeginDoSomething and EndDoSomething methods. However my DoSomething isn't really long-running. For simplicity assume DoSomething only compares two variables and return whether a > b So my BeginDoSomething should be like: protected …

Read More
How and when to use ‘async’ and ‘await’

From my understanding one of the main things that async and await do is to make code easy to write and read - but is using them equal to spawning background threads to perform long duration logic? I'm currently trying …

Read More