Asynchronous programming using .NET 4.0

Question

1.44/5 (2 votes)

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Hi, I have the following codes in .NET 4.0 using VS2010. I have researched online in which .NET 4.0 does not support the codes as below directly. One way is to use Task object which has the same output that I desired. Below are my codes in which I have written in .NET 4.5.1 but I will have to downgrade into .NET 4.0 for some purpose

C#

public async void RegenerateServerDate()
        {
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri("https://localhost:8089");
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                
                
                HttpResponseMessage response = await client.GetAsync("api/servertime");
                if (response.IsSuccessStatusCode)
                {
                    string result = await response.Content.ReadAsStringAsync();
                    result = Regex.Replace(result, @"[A-Za-z]", " ").Replace("\"", "");
                }
            }     
        }

How can I convert the above codes within Task object? Any help would be appreciated.

What I have tried:

1. Add Task in front of await keyword but hit error.

Posted 17-Apr-16 23:09pm

Jamie888

Updated 18-Apr-16 22:35pm

v2

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3 solutions

Solution 1

Asynchronous Programming with Async and Await (C# and Visual Basic)[^]

Posted 17-Apr-16 23:51pm

F-ES Sitecore

Comments

Jamie888 18-Apr-16 6:23am

Hi sir, I have tried to modify my codes as below:
Task<httpresponsemessage> response = client.GetAsync("api/servertime"));
if (response.Result.IsSuccessStatusCode)
{
//error here
string result = await response.Result.Content.ReadAsStringAsync();

Solution 3

C#

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri("https://localhost:8089");
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));


    HttpResponseMessage response = client.GetAsync("api/servertime").Result;
    if (response.IsSuccessStatusCode)
    {
        string result = response.Content.ReadAsStringAsync().Result;
        result = Regex.Replace(result, @"[A-Za-z]", " ").Replace("\"", "");
        dateTime = DateTime.Parse(result);
    }
    else
    {
        //dateTime = DateHelper.ConvertToUtc(DateTime.Now);
        dateTime = DateTime.UtcNow;
    }
}

Posted 18-Apr-16 22:35pm

Jamie888

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Passion4Code · Accepted Answer · 2016-04-18T00:40:00

Solution 2

Hello Jamie,

Since you are using VS 2010, resources say, VS 2010 does not support Async. Please follow the below link.

c# - in .net 4.0 I have not avaliable the async/await keywords -[^]

Check here: They suggest using Async CTP if you are on VS 2010
.net - Will VS 2010 allow me to use the new async and await keywords in C#?[^]

c# - Proper way to use Async with VS 2010 now that VS 2012 is released?[^]
Thanks

Posted 18-Apr-16 0:40am

Passion4Code

Updated 18-Apr-16 1:38am

v2

Comments

Jamie888 18-Apr-16 7:04am

So sir, does it means I have no choice but to use a newer version of .NET framework in order to use async programming?

Passion4Code 18-Apr-16 7:47am

Please check the updated answer. They are asking to add Async CTP (installation)

Jamie888 19-Apr-16 4:34am

Thank you sir. After some thought, I have decided to part way with the async programming. I will write my answer in below.

R. Erasmus 19-Apr-16 5:14am

Good answer!

Passion4Code 19-Apr-16 6:22am

Thanks Sir! :)