CODEWITHSUNDEEP
c#multithreadingasynchronous.net-coreasync-await
KBNanda
KBNanda

Reputation: 667

How to execute different REST API requests in parallel in C# on .NET Core?

Problem Statement

I need to send multiple API calls at one shot.

I have three different API endpoints as shown below, and all these need to be called together almost as quickly as possible. It's all independent of each other.

public async Task<string> GetA(string a)
{
}

public async Task<string> GetB(int a)
{
}

public async Task<string> GetC(int a, string a)
{
}

What I tried

I was trying like this:

public async Task CallMultipleAPIs()
{
    await GetA("");
    await GetB(1);
    await GetC(1, "");
}

How to implement parallelism here?

Upvotes: 1

Views: 4652

Answers (1)

Stephen Cleary
Stephen Cleary

Reputation: 456497

What you need is concurrency (not parallelism - i.e., multiple threads).

Concurrent asynchronous code is done by using Task.WhenAll:

public async Task CallMultipleAPIs()
{
  var taskA = GetA("");
  var taskB = GetB(1);
  var taskC = GetC(1, "");
  await Task.WhenAll(taskA, taskB, taskC);
}

Upvotes: 6

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