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POStuck at async method
 

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    <p>There maybe some obvious mistake but I'm doing something not experienced with. I'm trying to get a string from internet but its not working. In WinRT, we have to use HttpClient in async method, which I did as follows:-</p> <pre><code> private async void update() { try { rawdata = await client.GetStringAsync(url); } catch { rawdata = "Updation failed. Error code:vish42042"; } } </code></pre> <p>Now, here is how the code is called:-</p> <pre><code> string temp = @url; update(); WAIT: if (rawdata == null) { goto WAIT; } </code></pre> <p>rawdata is a global varible, I did this checking on goto WAIT: to see where exactly was code failing, and its failing here. I'm expecting the if loop to break when rawdata is updated from the internet, but it never happens. Am I doing it the wrong way?(OBVIOUSLY I'm not doing it in the best way I know, but is it wrong too?). Where is the problem?</p> <p>Update: Actually the problem is not HOW TO MAKE THIS FUNCTION WORK, it is working with a modification or two. The real problem is how do I make sure that rawdata is updated once update() function is called, because the code thereafter is expecting it not to be null but updated.</p> <p>After some very good explanations and answers, I think then this is the point where problem can be solved:-</p> <pre><code> string xmlstring = xmlupobj.getUpdatedData(); // Above is the ultimate point of return of data. //Next code line is this, which throws a null exception XDocument xmldoc = XDocument.Parse(xmlstring); </code></pre> <p>So I think after making getUpdatedData() async, returning Task, if we can convert Task to proper string in case it has been downloaded, and null if it has not been downloaded, then we can check using some bad lines of code as:-</p> <pre><code> string xmlstring = xmlupobj.getUpdatedData(); WAIT: if (xmlstring == null) { goto WAIT; } xmldoc = XDocument.Parse(xmlstring); </code></pre> <p>So if it is right, the only question remains is how to set xmlstring?</p>
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    1. CO@torrentialcoding I have no idea why your edit suggestion was rejected, it was clearly valid. I hope you don't mind me pushing your edit under my name.
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    2. CO@hvd No problem, restoring it was the right thing to do regardless of who is attributed for the edit. :)
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      1. UStorrential coding
    3. COEven if you *could* do what you wanted (*wait* for update() to complete) you app would block the main thread and fail certification.
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      1. USPeter Ritchie
 

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