public async Task CalcPiAsyncTPL()
{
Stopwatch timer = new Stopwatch();
timer.Start();
int numberOfTask = (int)_task.Value;
Task[] taskArray = new Task[numberOfTask];
int digits = (int)this._digits.Value;
int digitsPerTask = (digits / numberOfTask);
string _piString = "3.";
if (digits > 0)
{
for (int j = 0; j < taskArray.Length; j++)
{
taskArray[j] = Task.Factory.StartNew(
(Object obj) =>
{
CustomData data = obj as CustomData;
int digits1 = digitsPerTask * (data.Name + 1);
string piString1 = "";
for (int i = data.Name * digitsPerTask; i < (data.Name + 1) * digitsPerTask; i += 9)
{
int nineDigits = NineDigitsofPi.StartingAt(i + 1);
int digitCount = Math.Min(digits1 - i, 9);
string ds = string.Format("{0:D9}", nineDigits);
piString1 += ds.Substring(0, digitCount);
}
data.piString = piString1;
},
new CustomData()
{
Name = j
});
}
await Task.WhenAll(taskArray);
foreach (var task in taskArray)
{
var data = task.AsyncState as CustomData;
if (data != null)
{
_piString += data.piString;
}
}
_performance.Text = timer.Elapsed.TotalSeconds.ToString();
_pi.Text = _piString;
}
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
PiObject piObj = e.Argument as PiObject;
backgroundWorker1 = sender as BackgroundWorker;
backgroundWorker1.WorkerSupportsCancellation = true;
backgroundWorker1.WorkerReportsProgress = true;
StringBuilder pi = new StringBuilder("3", piObj.digits + 2);
var watch = System.Diagnostics.Stopwatch.StartNew();
if (piObj.digits > 0)
{
pi.Append(".");
for (int i = 0; i < piObj.digits; i += 9)
{
if (!this.backgroundWorker1.CancellationPending)
{
int nineDigits = NineDigitsofPi.StartingAt(i + 1);
int digitCount = Math.Min(piObj.digits - i, 9);
String ds = String.Format("{0:D9}", nineDigits);
pi.Append(ds.Substring(0, digitCount));
piObj.calcValue = pi.ToString();
}
else
{
e.Cancel = true;
}
}// the code that you want to measure comes here
watch.Stop();
}
var elapsedMs = watch.ElapsedMilliseconds;
piObj.elapsedMs = elapsedMs.ToString() + " ms";
}
public async Task CalcPiAsync()
{
Stopwatch timer = new Stopwatch();
timer.Start();
Task <string> t = new Task <string>
(
() =>
{
int digits = (int)this._digits.Value;
StringBuilder pi = new StringBuilder("3", digits + 2);
if (digits > 0)
{
pi.Append(".");
for (int i = 0; i < digits; i += 9)
{
int nineDigits = NineDigitsofPi.StartingAt(i + 1);
int digitCount = Math.Min(digits - i, 9);
string ds = string.Format("{0:D9}", nineDigits);
pi.Append(ds.Substring(0, digitCount));
}
}
return(pi.ToString());
}
);
//t.Start();
await t;
string result = await t;
timer.Stop();
_pi.Text = result;
_performance.Text = timer.Elapsed.TotalSeconds.ToString();
}
