ConfigureAwait true and false in C# with Example
In C#, the `ConfigureAwait` method is used in asynchronous programming to specify whether to marshal the continuation back to the original context captured at the point of the `await` operation. It affects how the code after the `await` keyword runs in terms of synchronization context. Here are the differences between `ConfigureAwait(true)` and `ConfigureAwait(false)`:
### `ConfigureAwait(true)`:
```csharp
await SomeTask().ConfigureAwait(true);
```
When you use `ConfigureAwait(true)`, it means that after the asynchronous operation is complete, the continuation (the code after the `await` keyword) will run in the original context captured at the point of the `await`. For example, if the `await` is inside a UI event handler, the continuation will run on the UI thread. If the `await` is in an ASP.NET request context, the continuation will be on the ASP.NET request context.
#### Example using `ConfigureAwait(true)`:
```csharp
async Task<string> GetDataAsync()
{
// Some asynchronous operation
await Task.Delay(1000).ConfigureAwait(true);
// Code after await runs in the original context (e.g., UI thread or ASP.NET request context).
return "Data loaded successfully.";
}
```
### `ConfigureAwait(false)`:
```csharp
await SomeTask().ConfigureAwait(false);
```
When you use `ConfigureAwait(false)`, it means that after the asynchronous operation is complete, the continuation will not marshal back to the original context. Instead, it will run on a thread pool thread. This can be beneficial in situations where you want to avoid deadlocks, especially in UI applications, ASP.NET, or any context where you want to release the captured synchronization context.
#### Example using `ConfigureAwait(false)`:
```csharp
async Task<string> GetDataAsync()
{
// Some asynchronous operation
await Task.Delay(1000).ConfigureAwait(false);
// Code after await runs on a thread pool thread.
return "Data loaded successfully.";
}
```
In this example, the `ConfigureAwait(false)` is used to avoid potential deadlocks that might occur if the synchronization context is captured and the continuation tries to marshal back to it.
Choosing between `ConfigureAwait(true)` and `ConfigureAwait(false)` depends on the specific context of your application. Use `ConfigureAwait(true)` when you need to continue on the original context (e.g., UI thread). Use `ConfigureAwait(false)` when you want to avoid deadlocks or when the context is not important for the continuation code.
