CODEWITHSUNDEEP
c#asynchronous
user5326581
user5326581

Reputation: 53

C# How to make this HttpRequest Async?

I have this code:

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(URL);
using (WebResponse myResponse = myRequest.GetResponse())
{
    using (StreamReader sr = new StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8))
    {
        result = sr.ReadToEnd();
    }
}

I want on the finish this request, run this code:

MessageBox.Show("Finish");

Also, when i run this code, my program become freeze. I think this problem solve with async HttpWebRequest.

Upvotes: 2

Views: 16040

Answers (3)

Reza Aghaei
Reza Aghaei

Reputation: 125197

EDIT

In order to "There are many different ways" that stated in original answer, its better to consider using async/await pattern that is done by Eser in his answer which is better answer

When there is async method like GetResponseAsync to do such job, its better to use it and avoid creating task.

Consider reading great posts of Stephen Cleary:

ORIGINAL

There are many different ways, for example:

string url= "http://www.google.com";
string result = "";
Task.Run(() =>
{
    HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
    using (WebResponse myResponse = myRequest.GetResponse())
    {
        using (StreamReader sr = new StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8))
        {
            result = sr.ReadToEnd();
        }
    }
}).ContinueWith(x =>
{
    //MessageBox.Show(result);
    MessageBox.Show("Finished");

    //here you can not easily set properties of form 
    //you should use Invoke pattern

});

This way the application will be completely responsive while the task is executing and there is no freezing anymore.

Upvotes: 1

Eser
Eser

Reputation: 12546

You can do it like (in an async method):

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(URL);
using (WebResponse myResponse = await myRequest.GetResponseAsync())
{
    using (StreamReader sr = new StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8))
    {
        result = sr.ReadToEnd();
    }
}
MessageBox.Show("Finish");

But I would recommend to use HttpClient

using (var client = new HttpClient())
{
    var result = await client.GetStringAsync(URL);
}
MessageBox.Show("Finish");

BTW: By using GetStringAsync you use the encoding your site is using which may not be UTF8

Upvotes: 14

codetoast
codetoast

Reputation: 303

You can use HttpClient in System.Net.Http for this(Assuming .net > 4.5):

HttpClient client = new HttpClient();
var code = client.GetAsync(URL).ContinueWith(x =>
{
    MessageBox.Show("finish");
    client.Dispose();
});

You should add some error checking in continue with to be sure.

Upvotes: 0

Related Questions