private void button1_Click(object sender, EventArgs e)
{
if (this.calcBtn.Text == "Calculate")
{
timer1.Start();
// Just a simple object to hold some values to be accessed globally
pi = new PIObject
{
calculatedValue = "",
num = (int)_digits.Value,
prog = 0
};
backgroundWorker1.RunWorkerAsync(pi);
progressBar1.Maximum = pi.num - 1;
calcBtn.Text = "Cancel";
//calcBtn.Text = "Completed";
}
else
{
timer1.Stop();
backgroundWorker1.CancelAsync();
}
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
PIObject piObj = e.Argument as PIObject;
BackgroundWorker bw = sender as BackgroundWorker;
StringBuilder pi = new StringBuilder("3", piObj.num + 2);
if (piObj.num > 0)
{
pi.Append(".");
for (int i = 0; i < piObj.num; i += 9)
{
if (!this.backgroundWorker1.CancellationPending)
{
int nineDigits = NineDigitsOfPi.StartingAt(i + 1);
int digitCount = Math.Min(piObj.num - i, 9);
String ds = String.Format("{0:D9}", nineDigits);
pi.Append(ds.Substring(0, digitCount));
piObj.calculatedValue = pi.ToString();
piObj.prog = i + 1;
}
else
{
e.Cancel = true;
}
}
}
}
private async Task <Cities> GetCitiesDataNoBatch()
{
//Exercise 1
//First HTTP request: Get the WebId of the AF database Weather
string url = baseUrl + @"assetdatabases?path=\\pisrv01\Weather";
string response = await DownloadWebData(url);
PIObject dbData = JsonConvert.DeserializeObject <PIObject>(response);
//Second HTTP request: Find all the 50 attributes called Wikipedia Thumbnail Url
//HINT: https://pisrv01.pischool.int/piwebapi/help/controllers/element/actions/findelementattributes
//HINT: Use JsonConvert.DeserializeObject to convert a JSON string to C# object
PIListObject imageAttributes; //Retrieve the response and deserialize into imageAttributes
//Third HTTP request: Get the values of those 50 attributes by making a bulk call
//HINT: https://pisrv01.pischool.int/piwebapi/help/controllers/streamset/actions/getvaluesadhoc
PIListObject imagesValues; //Retrieve the response and deserialize into imagesValues
//Using both PIListObjects as inputs, the Cities object is created.
//Cities cities = new Cities(imageAttributes, imagesValues);
//return cities;
return(null);
}
private async Task <Cities> GetCitiesDataNoBatch()
{
//Exercise 1
//First HTTP request against PI Web API to get the WebId of the AF database Weather
//Generate the url for making the first HTTP request
string url = baseUrl + @"assetdatabases?path=\\pisrv01\Weather";
//Retrieve the string response from URL
string response = await DownloadWebData(url);
//JsonConvert.DeserializeObject from JSON.NET converts the JSON string into a PIObject.
PIObject dbData = JsonConvert.DeserializeObject <PIObject>(response);
//Second HTTP request against PI Web API to get the WebId from all attributes "Wikipedia Thumbnail Url" (one per each city).
//HINT: https://pisrv01.pischool.int/piwebapi/help/controllers/element/actions/findelementattributes
url = baseUrl + "assetdatabases/" + dbData.WebId + "/elementattributes?attributeNameFilter=*Wikipedia%20Thumbnail%20Url*";
response = await DownloadWebData(url);
PIListObject imageAttributes = JsonConvert.DeserializeObject <PIListObject>(response);
//Third HTTP request against PI Web API to get the current values from all attributes "Wikipedia Thumbnail Url" using the WebId retrieved from the previous call.
//Get the WebIds from the PIListObject
List <string> webIds = imageAttributes.GetItemsWebIds();
//Using the GetValuesAdHoc method from StreamSet Controller
//HINT: https://pisrv01.pischool.int/piwebapi/help/controllers/streamset/actions/getvaluesadhoc
url = baseUrl + "streamsets/value?";
foreach (string webId in webIds)
{
url = url + string.Format("webId={0}&", webId);
}
url = url.Substring(0, url.Length - 1);
response = await DownloadWebData(url);
PIListObject imagesValues = JsonConvert.DeserializeObject <PIListObject>(response);
//Using both PIListObjects as inputs, the Cities object is created.
Cities cities = new Cities(imageAttributes, imagesValues);
return(cities);
}