public async Task <string> StartTask(string name, int delay, int failAfter)
{
var tokenSource = new CancellationTokenSource();
string taskId = Guid.NewGuid().ToString();
var item = new TaskProperties(taskId, name, tokenSource);
item.State = TaskState.Running;
CurrentTasks.TryAdd(taskId, item);
Clients.All.taskStarted(item);
var task = SampleAsyncTask.StartCalculation(delay, failAfter, tokenSource.Token, new Progress <int>(percent => onProgressChange(taskId, percent)));
// ReSharper disable CSharpWarnings::CS4014
task.ContinueWith(t => onTaskFinished(t, item), tokenSource.Token);
task.ContinueWith(t => onTaskFinished(t, item), TaskContinuationOptions.OnlyOnCanceled);
// ReSharper restore CSharpWarnings::CS4014
await task;
return(taskId);
}
public void AsyncTask00()
{
Assert.Throws<ArgumentNullException>(() =>
{
// The first argument cannot be null.
var task = new SampleAsyncTask(null);
});
}