call web api by passing simple and complex parameter
Solution 1
field1
, field2
and field4
parameters are expected in the Url, not in the request body. That's why the request Url should look like: http://xxx.xxx.xx.xx:1234/api/home/processfields?field1=value1&field2=value2&field4=value4
field3
is deserialized from the body. However as it is string parameter, request body should be built not as JSON object:
{
"field3": "value3"
}
but as JSON string:
"value3"
Here is adjusted client code that should work:
using (var client = new HttpClient())
{
//set up client
client.BaseAddress = new Uri(Baseurl);
client.DefaultRequestHeaders.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var requestUri = new Uri($"api/home/processfields?field1={HttpUtility.UrlEncode(field1)}&field2={HttpUtility.UrlEncode(field2)}&field4={HttpUtility.UrlEncode(field4)}", UriKind.Relative);
var content = new StringContent($"\"{field3}\"", Encoding.UTF8, "application/json");
var response = await client.PostAsync(requestUri, content);
var result = await response.Content.ReadAsStringAsync();
}
Solution 2
First, looking at the Web API method signature, I don't think there's any JSON involved here at all. So I think you can skip setting the Accept
header. (If the [FromBody]
parameter were a complex object rather than a string, then JSON serialization would likely come into play.)
Second, never use .Result
with HttpClient. It is an async-only API and you should be using async
/ await
, otherwise you're just inviting deadlocks.
Finally, as others have pointed out, field1, field2, and field4 go in the query string, not the body. If you want a more structured way to do this, and with less ceremony overall, consider using Flurl (disclaimer: I'm the author), which uses HttpClient under the hood:
using Flurl.Http;
var result = await BaseUrl
.AppendPathSegment("api/home/processfields")
.SetQueryParams(new { field1, field2, field4 })
.PostStringAsync(field3)
.ReceiveString();
Solution 3
bodyClass obj = new bodyClass();
obj.empName= "your param value";
string DATA = Newtonsoft.Json.JsonConvert.SerializeObject(obj);
var client = new HttpClient();
HttpContent content = new StringContent(DATA, UTF8Encoding.UTF8, "application/json");
HttpResponseMessage messge = client.PostAsync("your api url", content).Result;
if (messge.IsSuccessStatusCode)
{
string result = messge.Content.ReadAsStringAsync().Result;
}
santa029
Updated on September 12, 2020Comments
-
santa029 over 3 years
Getting an error message of no http resource or action found in controller. In a web api I have a from body and from uri parameter.
[HttpPost] public IHttpActionResult processfields( [FromUri]string field1, [FromUri]string field2, [FromBody] string field3, [FromUri]string field4 ){...}
In the client I want to call the web api by doing--
using (var client = new HttpClient()) { //set up client client.BaseAddress = new Uri(Baseurl); client.DefaultRequestHeaders.Clear(); client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); var values = new Dictionary<string, string>(); values.Add("field1", field1); values.Add("field2", field2); values.Add("field3", field3); values.Add("field4", filed4); var jsonString = JsonConvert.SerializeObject(values); try { HttpResponseMessage Res = client.PostAsync("api/home/processfields", new StringContent(jsonString, Encoding.UTF8, "application/json")).Result; var result = Res.Content.ReadAsStringAsync(); } }
While debugging, it executes the last line above but nothing happens and error message says--
{"Message":"No HTTP resource was found that matches the request URI 'http://xxx.xxx.xx.xx:1234/api/home/processfields'.","MessageDetail":"No action was found on the controller 'home' that matches the request."}
my webapi.config has
// Web API routes config.MapHttpAttributeRoutes(); config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{action}/{id}", defaults: new { id = RouteParameter.Optional } );