Call HttpPost method from client in C # code
I am new to MVC and C #, so sorry if this question seems too simple.
For HttpPost Controller as below, how to call this method directly from a client program written in C #, without a browser (NOT from a UI form in a browser with a submit button)? I am using .NET 4 and MVC 4.
I'm sure there is an answer on the internet, but I haven't found one yet. Any help is appreciated!
[HttpPost]
public Boolean PostDataToDB(int n, string s)
{
//validate and write to database
return false;
}
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For example with this server side code:
[HttpPost]
public Boolean PostDataToDB(int n, string s)
{
//validate and write to database
return false;
}
You can use different settings:
From WebClient
:
using (var wb = new WebClient())
{
var data = new NameValueCollection();
data["n"] = "42";
data["s"] = "string value";
var response = wb.UploadValues("http://www.domain.org/receiver.aspx", "POST", data);
}
From HttpRequest
:
var request = (HttpWebRequest)WebRequest.Create("http://www.domain.org/receiver.aspx");
var postData = "n=42&s=string value";
var data = Encoding.ASCII.GetBytes(postData);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
From HttpClient
:
using (var client = new HttpClient())
{
var values = new List<KeyValuePair<string, string>>();
values.Add(new KeyValuePair<string, int>("n", "42"));
values.Add(new KeyValuePair<string, string>("s", "string value"));
var content = new FormUrlEncodedContent(values);
var response = await client.PostAsync("http://www.domain.org/receiver.aspx", content);
var responseString = await response.Content.ReadAsStringAsync();
}
FROM WebRequest
WebRequest request = WebRequest.Create ("http://www.domain.org/receiver.aspx");
request.Method = "POST";
string postData = "n=42&s=string value";
byte[] byteArray = Encoding.UTF8.GetBytes (postData);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream ();
dataStream.Write (byteArray, 0, byteArray.Length);
dataStream.Close ();
//Response
WebResponse response = request.GetResponse ();
Console.WriteLine (((HttpWebResponse)response).StatusDescription);
dataStream = response.GetResponseStream ();
StreamReader reader = new StreamReader (dataStream);
string responseFromServer = reader.ReadToEnd ();
Console.WriteLine (responseFromServer);
reader.Close ();
dataStream.Close ();
response.Close ();
see msdn
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You can use First of all, you must return a valid result:
[HttpPost]
public ActionResult PostDataToDB(int n, string s)
{
//validate and write to database
return Json(false);
}
After that, you can use the HttpClient class from the Web Api NuGet Client Libraries:
public async bool CallMethod()
{
var rootUrl = "http:...";
bool result;
using (var client = new HttpClient())
{
client.BaseAddress = new Uri(_rootUrl);
var response= await client.PostAsJsonAsync(methodUrl, new {n = 10, s = "some string"});
result = await response.Content.ReadAsAsync<bool>();
}
return result;
}
You can also use the WebClient class:
[HttpPost]
public Boolean PostDataToDB(int n, string s)
{
//validate and write to database
return false;
}
public async bool CallMethod()
{
var rootUrl = "http:...";
bool result;
using (var client = new WebClient())
{
var col = new NameValueCollection();
col.Add("n", "1");
col.Add("s", "2");
var res = await client.UploadValuesAsync(address, col);
string res = Encoding.UTF8.GetString(res);
result = bool.Parse(res);
}
return result;
}
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If you choose to use the HttpClient. Do not create or delete HttpClient for every API call. Instead, reuse a single HttpClient instance. You can achieve this by declaring the instance static or by implementing the singleton pattern.
Link: https://aspnetmonsters.com/2016/08/2016-08-27-httpclientwrong/
How to implement a singleton (good starting point, read the comments on this post): https://codereview.stackexchange.com/questions/149805/implementation-of-a-singleton-httpclient-with-generic-methods
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