I have the following code:
public static async Task<string> Start(IProgress<ProcessTaskAsyncExProgress> progress)
{
const int total = 10;
for (var i = 0; i <= total; i++)
{
await Task.Run(() => RunLongTask(i.ToString(CultureInfo.InvariantCulture)));
if (progress != null)
{
var args = new ProcessTaskAsyncExProgress
{
ProgressPercentage = (int)(i / (double)total * 100.0),
Text = "processing " + i
};
progress.Report(args);
}
}
return "Done";
}
private static string RunLongTask(string taskName)
{
Task.Delay(300);
return taskName + "Completed!";
}
How do I get back the string value of RunLongTask
from this line: await Task.Run(() => RunLongTask(i.ToString(CultureInfo.InvariantCulture)));
?
I've tried:
var val = await Task.Run(() => RunLongTask(i.ToString(CultureInfo.InvariantCulture))).Result;
But I get an error saying "string is not awaitable".
Remove the Result
from the end. When you await
you will get the Result
back from the await-able method.
var val = await Task.Run(() => RunLongTask(i.ToString(CultureInfo.InvariantCulture)));
This is not a direct answer to old question, but for others searching:
"Normally" you shouldn't do this, but sometimes you need to match a library API so you can use a wrapper function like below:
private async Task<string> WrapSomeMethod(string someParam)
{
//adding .ConfigureAwait(false) may NOT be what you want but google it.
return await Task.Run(() => SomeObj.SomeMethodAsync(someParam)).ConfigureAwait(false);
}
And then call that instead with .Result like below:
string blah = WrapSomeMethod(someParam).Result;
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