Concurrent post request c#

public async Task<IEnumerable<UserDto>> GetUsersInParallelInWithBatches(IEnumerable<int> userIds)
    {
        var tasks = new List<Task<IEnumerable<UserDto>>>();
        var batchSize = 100;
        int numberOfBatches = (int)Math.Ceiling((double)userIds.Count() / batchSize);

        for (int i = 0; i < numberOfBatches; i++)
        {
            var currentIds = userIds.Skip(i * batchSize).Take(batchSize);
            tasks.Add(client.GetUsers(currentIds));
        }
            
        return (await Task.WhenAll(tasks)).SelectMany(u => u);
    }

Source: michalbialecki.com

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