Page 176 - CSharp/C#

//Assign the event handler
web.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
//Download the file async
web.DownloadFileAsync(new Uri(uri), DownloadLocation);
//Notice how there is no complete event, instead we're using techniques from the first
example
}
private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e){
int i = 0;
i++;
doSomething();
}
private void doProcess(){
//Wait for the download to finish
await DownloadAndUpdateAsync(new Uri("http://example.com/file"))
doSomething();
}

Caller Information Attributes

C.I.A.s are intended as a simple way of getting attributes from whatever is calling the targeted
method. There is really only 1 way to use them and there are only 3 attributes.

Example:

//This is the "calling method": the method that is calling the target method
public void doProcess()
{
GetMessageCallerAttributes("Show my attributes.");
}
//This is the target method
//There are only 3 caller attributes
public void GetMessageCallerAttributes(string message,
//gets the name of what is calling this method
[System.Runtime.CompilerServices.CallerMemberName] string memberName = "",
//gets the path of the file in which the "calling method" is in
[System.Runtime.CompilerServices.CallerFilePath] string sourceFilePath = "",
//gets the line number of the "calling method"
[System.Runtime.CompilerServices.CallerLineNumber] int sourceLineNumber = 0)
{
//Writes lines of all the attributes
System.Diagnostics.Trace.WriteLine("Message: " + message);
System.Diagnostics.Trace.WriteLine("Member: " + memberName);
System.Diagnostics.Trace.WriteLine("Source File Path: " + sourceFilePath);
System.Diagnostics.Trace.WriteLine("Line Number: " + sourceLineNumber);
}

Example Output:

//Message: Show my attributes.
//Member: doProcess
//Source File Path: c:\Path\To\The\File
//Line Number: 13

Read C# 5.0 Features online: https://riptutorial.com/csharp/topic/4584/csharp-5-0-features

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