- 1 year ago
C# async file operations / eliminate UI Blocking
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To perform file operations asynchronously in C# and eliminate UI blocking, you can use the async
and await
keywords in combination with the Task
and Task.Run
classes. Here's an example of how to read a file asynchronously using these techniques:
csharpprivate async Task<string> ReadFileAsync(string filePath)
{
string fileContents = "";
await Task.Run(() =>
{
using (StreamReader reader = new StreamReader(filePath))
{
fileContents = reader.ReadToEnd();
}
});
return fileContents;
}
Here's how the code works:
- Define a method that returns a
Task<string>
to indicate that it performs an asynchronous file operation and returns a string result. - Use the
await
keyword to asynchronously execute aTask.Run
call, which runs the file reading operation on a separate thread. - Inside the
Task.Run
call, use ausing
statement with aStreamReader
to read the file contents. - Assign the file contents to a variable.
- Return the file contents as the result of the method.
By using the async
and await
keywords, along with the Task
and Task.Run
classes, you can perform file operations asynchronously and avoid blocking the UI thread in your C# application. You can modify this code to perform other file operations asynchronously as well, such as writing to a file, copying a file, or deleting a file.