ThreadPool.QueueUserWorkItem with function argument/parameter

I have the following method, which I want to run using WaitCallBack delegate (C# Thread-Pooling) technique:

public void ExportData(string data){
//Codes goes in here
}

how to use ThreadPool.QueueUserWorkItem(new WaitCallback(ExportData),object} in order to call this method??

Jon Skeet
people
quotationmark

Some options:

  • Declare the method with type string and cast

  • Use a lambda expression instead, e.g.

    ThreadPool.QueueUserWorkItem(ignored => ExportData(value))

    where I assume value is a string variable in scope at the time. This will create a new delegate instance each time you go through this code, to capture value.

  • A combination of the above:

    ThreadPool.QueueUserWorkItem(x => ExportData((string) x), value)

    This will (potentially) reuse the same delegate instance on every call, as the value is passed via the normal WaitCallback instead of being captured by the delegate.

Additionally, you might want to consider using the rather more modern Task API unless you're targeting an old version of .NET. It's a generally more pleasant way of scheduling and managing tasks.

people

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