private void RunDownloadSync()
{
List <string> websites = PrepData();
foreach (string site in websites)
{
WebsiteDataModel results = DownloadWebsite(site);
ReportWebsiteInfo(results);
}
}
/// <summary>
/// Here is shown how a method can return a Task wrapped with data.
/// The Task contains the WebsiteDataModel and it can be used in RunDownloadParallelAsync() method
/// </summary>
/// <param name="websiteURL"></param>
/// <returns></returns>
private async Task <WebsiteDataModel> DownloadWebsiteAsync(string websiteURL)
{
WebsiteDataModel output = new WebsiteDataModel();
WebClient client = new WebClient();
output.WebsiteUrl = websiteURL;
output.WebsiteData = await client.DownloadStringTaskAsync(websiteURL);
return(output);
}
private static WebsiteDataModel DownloadWebsite(string websiteURL)
{
WebsiteDataModel output = new WebsiteDataModel();
WebClient client = new WebClient();
output.WebsiteUrl = websiteURL;
output.WebsiteData = client.DownloadString(websiteURL);
return(output);
}
private WebsiteDataModel DownloadWebsite(string websiteURL)
{
var output = new WebsiteDataModel();
var client = new WebClient();
output.WebsiteUrl = websiteURL;
output.WebsiteData = client.DownloadString(websiteURL);
return(output);
}
/// <summary>
/// Method that downloads website data asynchronus.
/// Notice that it returns a Task and has the keyword async.
/// The await is used for the Task to wait for a method to be done executing. And the UI can be responsive while this is happening.
/// </summary>
/// <returns></returns>
private async Task RunDownloadAsync()
{
List <string> websites = PrepData();
foreach (string site in websites)
{
WebsiteDataModel results = await Task.Run(() => DownloadWebsite(site));
ReportWebsiteInfo(results);
}
}
public static List <WebsiteDataModel> RunDownloadSync()
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
foreach (string site in websites)
{
WebsiteDataModel results = DownloadWebsite(site);
output.Add(results);
}
return(output);
}
private async Task RunDownloadAsync()
{
//this method is don't provide any performance optimitation because the ask for a site and the wait for the interrogation.
List <string> websites = PrepData();
foreach (string site in websites)
{
WebsiteDataModel results = await Task.Run(() => DownloadWebsite(site));
ReportWebsiteInfo(results);
}
}
private WebsiteDataModel DownloadWebsite(string websiteUrl)
{
WebsiteDataModel output = new WebsiteDataModel();
WebClient client = new WebClient();
output.WebsiteUrl = websiteUrl;
var result = client.DownloadString(websiteUrl);
output.WebsiteData = result;
output.getResults = !string.IsNullOrEmpty(result);
return(output);
}
public static List <WebsiteDataModel> RunDownloadParallelSync()
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
Parallel.ForEach <string>(websites, (site) =>
{
WebsiteDataModel results = DownloadWebsite(site);
output.Add(results);
});
return(output);
}
public static List <WebsiteDataModel> RunDownloadSync(System.Windows.Controls.ProgressBar dashboardProgress)
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
foreach (string site in websites)
{
WebsiteDataModel results = DownloadWebsite(site);
output.Add(results);
dashboardProgress.Dispatcher.Invoke(() => dashboardProgress.Value = output.Count * 100 / websites.Count, DispatcherPriority.Background);
}
return(output);
}
private async Task RunDownloadAsync()
{
List <string> websites = PrepData();
foreach (string site in websites)
{
// it will block next website until the 1st website done
// obs:optimize: never keep the await in foreach
//u can make entire method async thats great else ts.run(method()) both same st is preferrable
WebsiteDataModel results = await Task.Run(() => DownloadWebsite(site));
ReportWebsiteInfo(results);
}
}
//Never return void from an async task(only by an event thats an exception)
private async Task RunDownloadAsync()
{
List <string> websites = PrepData();
foreach (string site in websites)
{
//Do that asynchronosly but wait for the result
//The caller will go on with his work while this is running
//When he gets the ressults he makes further here
WebsiteDataModel results = await Task.Run(() => DownloadWebsite(site));
ReportWebsiteInfo(results);
}
}
private async Task <WebsiteDataModel> DownloadWebsiteAsync(string websiteUrl)
{
WebsiteDataModel output = new WebsiteDataModel();
output.WebsiteUrl = websiteUrl;
var stopwatch = System.Diagnostics.Stopwatch.StartNew();
var result = await HttpClient.GetStringAsync(websiteUrl);
output.getResults = !string.IsNullOrEmpty(result);
output.WebsiteData = result;
output.ThreadElapsedTime = $"{stopwatch.ElapsedMilliseconds}";
return(output);
}
/// <summary>
/// If we don't have control over the synchronous method 'DownloadWebsite'
/// but we still need to run it asyncronously then use Task.Run.
/// Tip: Don't return void from an async method. If there's nothing to return, use 'Task'
/// Or if there's a return type e.g. string, use Task<string>
/// One exception: In case of event leave the return type void.
/// Naming convention: Append 'Async' to the end of the methodname which going to return asynchronously.
/// 'async' means the caller of this method can go on with their task!
///
/// </summary>
/// <returns></returns>
private async Task RunDownloadAsync()
{
List <string> websites = PrepData();
foreach (string site in websites)
{
//Starts DownloadWebsite method and waits it to return
//Loads sites one by one
//This cause similar execution time as synchronous RunDownloadSync()
//But at least the UI will be responsive
WebsiteDataModel results = await Task.Run(() => DownloadWebsite(site));
ReportWebsiteInfo(results);
}
}
public static List <WebsiteDataModel> RunDownloadParallelSync()
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
// Inside the foreach code execution is parralell, not iteration by iteration
// It locks up until the longest task is ready, so the UI is inresponsive.
Parallel.ForEach <string>(websites, (site) =>
{
WebsiteDataModel results = DownloadWebsite(site);
output.Add(results);
});
return(output);
}
public static async Task <List <WebsiteDataModel> > RunDownloadParallelAsyncV2()
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
await Task.Run(() =>
{
Parallel.ForEach <string>(websites, (site) =>
{
WebsiteDataModel results = DownloadWebsite(site);
output.Add(results);
});
});
return(output);
}
private static WebsiteDataModel DownloadWebsite(string websiteURL)
{
WebProxy p = new WebProxy("10.216.190.6", true);
p.Credentials = new NetworkCredential("john.reese", "john.reese");
WebRequest.DefaultWebProxy = p;
WebsiteDataModel output = new WebsiteDataModel();
WebClient client = new WebClient();
client.Proxy = p;
output.WebsiteUrl = websiteURL;
output.WebsiteData = client.DownloadString(websiteURL);
return(output);
}
public static async Task <List <WebsiteDataModel> > RunDownloadAsync(IProgress <ProgressReportModel> progress)
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
ProgressReportModel report = new ProgressReportModel();
foreach (string site in websites)
{
WebsiteDataModel results = await DownloadWebsiteAsync(site);
output.Add(results);
report.PercentageComplete = output.Count * 100 / websites.Count;
report.SitesDownloaded = output;
progress.Report(report);
}
return(output);
}
// Using Parallel ForEach
public static List <WebsiteDataModel> RunDownloadParallelSync()
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
// Parallel ForEach:
// foreach (string site in website)
// {
// WebsiteDataModel results = DownloadWebsite(site);
// output.Add(results);
// }
Parallel.ForEach <string>(websites, (site) =>
{
WebsiteDataModel results = DownloadWebsite(site);
output.Add(results);
});
return(output);
}//RunDownloadParallelSync
}//RunDownloadParallelSync
// Wrapping Parallel.ForEach to an Async Task
public static async Task <List <WebsiteDataModel> > RunDownloadParallelAsyncV2(IProgress <ProgressReportModel> progress)
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
ProgressReportModel report = new ProgressReportModel();
await Task.Run(() =>
{
Parallel.ForEach <string>(websites, (site) =>
{
WebsiteDataModel results = DownloadWebsite(site);
output.Add(results);
report.SitesDownloaded = output;
report.PercentageComplete = (output.Count * 100) / websites.Count; // converting to percent values
progress.Report(report);
});
});
return(output);
}//RunDownloadParallelAsyncV2
public static async Task <List <WebsiteDataModel> > RunDownloadParallelAsync(IProgress <ProgressReportModel> progress)
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
ProgressReportModel report = new ProgressReportModel();
ParallelOptions parallelOptions = new ParallelOptions();
parallelOptions.MaxDegreeOfParallelism = 6;
await Task.Run(() => {
Parallel.ForEach <string>(websites, parallelOptions, (site) =>
{
WebsiteDataModel results = DownloadWebsite(site);
output.Add(results);
report.PercentageComplete = output.Count * 100 / websites.Count;
report.SitesDownloaded = output;
progress.Report(report);
});
});
return(output);
}
public static async Task <List <WebsiteDataModel> > RunDownloadAsync(IProgress <ProgressReportModel> progress, CancellationToken cancellationToken)
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
ProgressReportModel progressReportModel = new ProgressReportModel();
foreach (string site in websites)
{
WebsiteDataModel results = await DownloadWebsiteAsync(site);
output.Add(results);
cancellationToken.ThrowIfCancellationRequested();
progressReportModel.SitesDownloaded = output;
progressReportModel.PercentageComplete = (output.Count * 100) / websites.Count;
progress.Report(progressReportModel);
}
return(output);
}
}//RunDownloadParallelAsyncV2
public static async Task <List <WebsiteDataModel> > RunDownloadAsync(IProgress <ProgressReportModel> progress, CancellationToken cancellationToken)
{
List <string> websites = PrepData();
List <WebsiteDataModel> output = new List <WebsiteDataModel>();
ProgressReportModel report = new ProgressReportModel();
foreach (string site in websites)
{
WebsiteDataModel results = await DownloadWebsiteAsync(site);
output.Add(results);
// TODO implement if to check IsCancellationRequested method
// Adding Cancelling functionaly if page takes too long to download, Won't cancel unless the task is cancelled (clicked)
cancellationToken.ThrowIfCancellationRequested();
report.SitesDownloaded = output;
report.PercentageComplete = (output.Count * 100) / websites.Count; // converting to percent values
progress.Report(report);
}
return(output);
}// RunDownloadAsync
private void ReportWebsiteInfo(WebsiteDataModel data)
{
resultsWindow.Text += $"{ data.WebsiteUrl } downloaded: { data.WebsiteData.Length } characters long.{ Environment.NewLine }";
}
private void ReportWebsiteInfo(WebsiteDataModel data)
{
resultsWindowBlack.Text += $"{ data.WebsiteUrl } (DL: { data.WebsiteData.Length } bytes). Time: {data.ThreadElapsedTime} ms. { Environment.NewLine }";
resultsWindowGreen.Text += $"\t {(data.getResults ? "OK!" : "FAILED!")} { Environment.NewLine }";
}
