Calling multiple WebServices Asynchronously

Question

I'm getting a List of Object with URL,some Data and a User Id. I want to write a function to call the different web services asynchronously and return a list of response and User Id in list. But if the URL is same then the call should be Synchronous to that particular service with different data provided in input.

Answer 1

You can follow the following steps - Group the list by url - pass the grouped item to separate async method - the second method would make service call as synchronously

Please refer to below code

List<Response> DoTask(List<MyObject> list)
{
    var groupedList = list.GroupBy(x => x.Url)
    var taskList = new List<Task<List<Response>>>();

    foreach(group in GroupList)
    {
        taskList.Add(CallService(group.ToList()))
    }

    Task.WaitAll(taskList.ToArray());
    return taskList.SelectMany(x => x.Result);
}

// This method would get service call of same urls only
async Task<List<Response>> CallService(List<MyObject> list)
{
    var responseList = new List<Response>();

    foreach(var item in list)
    {
        var response = new Response();
        response.Result =  await HttpServiceCall(MyObject object);
        response.UserId = item.UserId

        responseList.Add(response);
    }

    return responseList;
}

async Task<Response> HttpServiceCall(MyObject object)
{
    //make service call
}