NET HttpClient How to POST string value

Question

How can I create using C  and HttpClient the following POST request    I need such a request for my WEB API service    ActionName  exist     HttpPost  public bool CheckIfUserExist  FromBody  string login                   return  membershipProvider CheckIfExist login

User · Answer

There is an article about your question on asp.net's website. I hope it can help you.

How to call an api with asp net

http://www.asp.net/web-api/overview/advanced/calling-a-web-api-from-a-net-client

Here is a small part from the POST section of the article

The following code sends a POST request that contains a Product instance in JSON format:

// HTTP POST
var gizmo = new Product() { Name = "Gizmo", Price = 100, Category = "Widget" };
response = await client.PostAsJsonAsync("api/products", gizmo);
if (response.IsSuccessStatusCode)
{
    // Get the URI of the created resource.
    Uri gizmoUrl = response.Headers.Location;
}

User · Answer

You could do something like this   HttpWebRequest req    HttpWebRequest WebRequest Create  http   localhost 6740 api Membership exist     req Method    POST   req ContentType    application x-www-form-urlencoded            req ContentLength   6   StreamWriter streamOut   new StreamWriter req GetRequestStream    System Text Encoding ASCII   streamOut Write strRequest   streamOut Close    StreamReader streamIn   new StreamReader req GetResponse   GetResponseStream     string strResponse   streamIn ReadToEnd    streamIn Close      And then strReponse should contain the values returned by your webservice

User · Answer

Here I found this article which is send post request using JsonConvert SerializeObject    amp  StringContent   to HttpClient PostAsync data static async Task Main string   args        var person   new Person        person Name    quot John Doe quot       person Occupation    quot gardener quot        var json   Newtonsoft Json JsonConvert SerializeObject person       var data   new System Net Http StringContent json  Encoding UTF8   quot application json quot         var url    quot https   httpbin org post quot       using var client   new HttpClient         var response   await client PostAsync url  data        string result   response Content ReadAsStringAsync   Result      Console WriteLine result

User · Answer

using System  using System Collections Generic  using System Net Http   class Program       static void Main string   args                Task Run      gt  MainAsync             Console ReadLine               static async Task MainAsync                 using  var client   new HttpClient                          client BaseAddress   new Uri  http   localhost 6740                var content   new FormUrlEncodedContent new                                 new KeyValuePair lt string  string gt       login                               var result   await client PostAsync   api Membership exists   content               string resultContent   await result Content ReadAsStringAsync                Console WriteLine resultContent

User · Answer

Below is example to call synchronously but you can easily change to async by using await-sync   var pairs   new List lt KeyValuePair lt string  string gt  gt                                new KeyValuePair lt string  string gt   login    abc                   var content   new FormUrlEncodedContent pairs    var client   new HttpClient  BaseAddress   new Uri  http   localhost 6740             call sync var response   client PostAsync   api membership exist   content  Result   if  response IsSuccessStatusCode

[c#] .NET HttpClient. How to POST string value?

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