CODEWITHSUNDEEP
silverlighthttp
Dimitri C.
Dimitri C.

Reputation: 22506

Starting two WebClient.UploadStringAsync calls subsequently

When calling WebClient.UploadStringAsync twice, without waiting for the WebClient.UploadStringCompleted event, the following exception is thrown:

"WebClient does not support concurrent I/O operations"

Apparently, this is not supported.

The reason for wanting to start multiple HTTP POST requests without having to wait for the previous response to arrive is because of performance; I want to avoid the round trip delay. Is there a workaround for this limitation?

Upvotes: 3

Views: 3026

Answers (1)

AnthonyWJones
AnthonyWJones

Reputation: 189505

You need to use multiple instances of WebClient. 

 var wc1 = new WebClient();
 wc1.UploadStringCompleted += (s, args) => {
    // do stuff when first upload completes
 }
 wc1.UploadString(uri1,str1);

 var wc2 = new WebClient();
 wc2.UploadStringCompleted += (s, args) => {
    // do stuff when second upload completes
    // might happen before first has completed
 }
 wc2.UploadString(uri2,str2);

Upvotes: 7

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