Unable to do POST request using C# code using authentication

Question

I am using below code to do a POST request on a url.

namespace ConsoleAppPost
{
    using System;
    using System.Net.Http;
    using System.Threading.Tasks;

    namespace HttpClientStatus
    {
        class Program
        {
            static async Task Main(string[] args)
            {
                using var client = new HttpClient();

                var result = await client.PostAsync("https://XXXX/api/XXX/XX/XXX/xyz", HttpContent content);
                Console.WriteLine(result.StatusCode);


            }
        }
    }
}

But ,i am getting below error:

No overload for method PostAsync takes 1 argument

I also want to use username and password as authentication to do POST request in the code. Please help me.

you're not passing any data into the second PostAsync param.. — d.moncada
– d.moncada, Commented Nov 22, 2019 at 15:44

KJSR · Accepted Answer · 2019-11-22 15:45:32Z

1

The issue lies here

var result = await client.PostAsync("https://XXXX/api/XXX/XX/XXX/xyz", HttpContent content);

You are passing type HttpContent content as parameter and NOT the data instead?

You need to do something like this

var content = new FormUrlEncodedContent(new[]
{
    new KeyValuePair<string, string>("Username", "<value>"),
    new KeyValuePair<string, string>("Password", "<value>"),
});
var result = await client.PostAsync("https://XXXX/api/XXX/XX/XXX/xyz", content);

answered Nov 22, 2019 at 15:45

KJSR

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7 Comments

Penguin Tech Over a year ago

Now, I am getting below error: Severity Code Description Project File Line Suppression State Error CS0246 The type or namespace name 'KeyValuePair<,>' could not be found (are you missing a using directive or an assembly reference?)

KJSR Over a year ago

@PenguinTech use System.Collections.Generic namespace

Penguin Tech Over a year ago

Thanks a lot. It works now. But i am unable to print any response on command line though i use Console.Readline : var result = await client.PostAsync("XXXXX", content); Console.ReadLine();

KJSR Over a year ago

What is the error you are getting? Also are you expecting from your post request?

Penguin Tech Over a year ago

I am not getting any error. In the console ,i am not getting any output printed . I am expecting the response similar to when i do the post request from browser .

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