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Editorial Team
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Asked: 2026-06-18T09:12:29+00:00

We are calling WCF services asyncronously. public partial class ServiceClient : System.ServiceModel.ClientBase<MyService>, MyService {

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We are calling WCF services asyncronously. 

public partial class ServiceClient : System.ServiceModel.ClientBase<MyService>, MyService 
{
    ......
}

ServiceClient _serviceclient;
void Getproducts(string filter, string augument, EventHandler<GetCompletedEventArgs> callback)
{
    _serviceclient.GetAsyncGetproducts(filter, argument, callback);
}

I want to the Getproducts function to be synchronous. What is the best way to achieve this like the following 

void Getproducts(string filter, string augument, EventHandler<GetCompletedEventArgs> callback)
{
    _serviceclient.GetAsyncGetproducts(filter, argument, callback);
    //wait until callback comes back and return
}

EDIT: The proxy is providing any synchronous calls

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1 Answer

  1. Editorial Team

    You cannot make synchronous networking requests in Silverlight from the UI thread. There’s no going around that. Even if you try to trick the asynchronous methods into behaving synchronously, it will not work. That’s because if that were possible, the UI thread would be blocked, and the application would appear to be frozen. This happens because the responses to networking requests in SL are always delivered to the UI thread; if you wait for it on the UI thread itself, then you create a deadlock.

    You essentially have two options: the preferred one is to actually go the asynchronous route. It’s hard at first, if you’re only used to synchronous programming, but it’s a very valuable skill to have. The other option is to make the call on a background thread. I’ve tried it and it works, and some people have blogged about it, so you can try it as well. But AFAIK it’s not officially supported.

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