This blog post will show you how to await the foreach loop in C#. Onwards c#, we can use async foreach
in our code. To use async foreach,
your method must return IAsyncEnumerable<T>.
Let’s understand it with one example. I am requesting the JsonPlaceHolder
API in the following code snippet. Instead of preparing the data, I am returning the data immediately using the c# state machine operator yield.
public async IAsyncEnumerable<string> GetPostAsync()
{
using var httpClient = new HttpClient()
{
BaseAddress = new Uri("https://jsonplaceholder.typicode.com/todos/")
};
for (int i = 1; i < 100; i++)
{
var data = await httpClient.GetStringAsync(i.ToString());
yield return data;
}
}
How to use
To use the above method, you can write the foreach loop and then prefix the foreach with the await
operator
async void Main()
{
await foreach (var item in GetPostAsync())
{
Console.WriteLine(item);
}
}