Alternative to Javascript's XMLHttpRequest in C# with Xamarin

Question

I have a webpage that uses XMLHttpRequest to do things like upload files, update the page, communication. I am trying to make an app (Android and iOS) with Xamarin that could be used instead of this website however I am having a hard time figuring out how to do the things I did with XMLHttpRequest in C#. Here is an example of something in Javascript that I would need to do in C# in Xamarin.

    {
        link = new ExEmElHttpRequest();     
        x = Date.now();
        link.ooooooopppppppen('GET', 'ajax_FMU0104;' + x, true);

        link.oooooonnnnnnreadystatechange = function() {
            if (link.rrrrrrreeeeeadyState == 4 && link.ssssssttttttatus == 200) {
            flag = 1;
            }
        };
        link.ssssseeeeend(null);
    }

Is there a way to port this function to C# or any tools in C# that could accomplish the same thing? I had to change some of the code and function names in order to post the question without getting this weird access denied error. I'm guessing the site was thinking I was trying to inject code.

Answer 1

Hello,

Welcome to Microsoft Q&A!

A similar class in c# is HttpClient Class, which provides a class for sending HTTP requests and receiving HTTP responses from a resource identified by a URI.

An examples:

// HttpClient is intended to be instantiated once per application, rather than per-use. See Remarks.  
 static readonly HttpClient client = new HttpClient();  

static async Task Main()  
{  
  // Call asynchronous network methods in a try/catch block to handle exceptions.  
  try	  
  {  
     HttpResponseMessage response = await client.GetAsync("http://www.contoso.com/");  
     response.EnsureSuccessStatusCode();  
     string responseBody = await response.Content.ReadAsStringAsync();  
     // Above three lines can be replaced with new helper method below  
     // string responseBody = await client.GetStringAsync(uri);  
  
     Console.WriteLine(responseBody);  
  }  
  catch(HttpRequestException e)  
  {  
     Console.WriteLine("\nException Caught!");	  
     Console.WriteLine("Message :{0} ",e.Message);  
  }  
}  

You can also check document Consume a RESTful web service, which demonstrates how to consume a RESTful web service from a Xamarin.Forms application.
Web service APIs that adhere to REST are called RESTful APIs, and are defined using:

• A base URI.
• HTTP methods, such as GET, POST, PUT, PATCH, or DELETE.
• A media type for the data, such as JavaScript Object Notation (JSON).

And there is also a sample about this, you can check it here: https://learn.microsoft.com/en-us/xamarin/xamarin-forms/data-cloud/web-services/rest .

Best Regards,

Jessie Zhang

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Answer 2

Perhaps you are looking for HttpClient; samples in HttpClient sample.