C# file download use await?

WriteLine " This is a simple statement. WriteLine " This is a second output statement. Code Explanation: for our third example, we have three different methods and we call these methods from the main method. With our main method, we call the callMethod, which has has a task to call for the exam1 method and so the exam1 is executed. As per the program, here the exam1 method will not be executed first as it has the await keyword, so it will move to the next method which is exam1 and the exam2 method will be executed, which is a statement, printed twice as mentioned in the for a loop.

Then our exam1 method will be printed followed by the exam3, the exam3 method is a single statement. Totally, a 13 output statement will be printed. The last statement will be printing the number of times we print the statement from the exam1 method. As explained the total number of 13 print statements, simple execution of await keyword with multiple methods. To conclude, the await keyword is used to suspend events and bring back control of the program to the caller.

This functionality is widely used when we have multiple methods and functions. The await keyword is used to return the control back to the caller and it can only be applied within the async method. This is a guide to C await. Here we also discuss the introduction to C await, how await keyword works along with different examples. You may also have a look at the following articles to learn more —. Submit Next Question. By signing up, you agree to our Terms of Use and Privacy Policy.

Forgot Password? The original example has the statement await sourceStream. WriteAsync encodedText, 0, encodedText. Length ; , which is a contraction of the following two statements:. The first statement returns a task and causes file processing to start. The second statement with the await causes the method to immediately exit and return a different task. When the file processing later completes, execution returns to the statement that follows the await.

The text is buffered and, in this case, placed into a StringBuilder. Unlike in the previous example, the evaluation of the await produces a value. For more information, see Async Return Types C.

For each file, the WriteAsync method returns a task that is then added to a list of tasks. The await Task. WhenAll tasks ; statement exits the method and resumes within the method when file processing is complete for all of the tasks. The example closes all FileStream instances in a finally block after the tasks are complete. If each FileStream was instead created in a using statement, the FileStream might be disposed of before the task was complete. Any performance boost is almost entirely from the parallel processing and not the asynchronous processing.

The advantages of asynchrony are that it doesn't tie up multiple threads, and that it doesn't tie up the user interface thread. When using the WriteAsync and ReadAsync methods, you can specify a CancellationToken , which you can use to cancel the operation mid-stream.

C has many built-in methods to read files asynchronously. For instance, the File. ReadAllTextAsync asynchronously opens a text file, reads all the text in the file, and then closes the file. The Task. We return the number of characters concatenated with text. The GetStringAsync sends a GET request to the specified url and returns the response body as a string in an asynchronous operation.

It returns a new task. Read C tutorial or list all C tutorials.