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I am creating a web API Service but I am having some problems when it comes to calling HTTP Patch requests. Though I know how to create them. If you could help me with this I would appreciate it, here is my code:

HTTP PATCH CODE:

[HttpPatch("{username}")] public async Task<ActionResult> Patch(string username, [FromBody] JsonPatchDocument<User> patchDocument) { //If no info has been passed, this API call will return badrequest if (patchDocument == null) return BadRequest(); var theUser = await connection.GetAUser(username); var originalUser = await connection.GetAUser(username); if (theUser == null) return NotFound(); //Changes specified in the patchdocument are applied to the user patchDocument.ApplyTo(theUser, ModelState); //check if the patching has been successful or not bool isValid = TryValidateModel(theUser); if (!isValid) return BadRequest(ModelState); else { bool check = await connection.UpdateUser(originalUser, theUser); if (check != true) return BadRequest(); else return Ok(); } }

Corelation with SQL Database (Method called from the previous code):

 public async Task<bool> UpdateUser(User originalUser, User patchedUser) { SqlCommand sqlCommand = new SqlCommand(); try { if (originalUser.password != patchedUser.password) { //string command = SQL COMMAND SqlParameter param1 = new SqlParameter(); param1.ParameterName = "@password"; param1.Value = patchedUser.password; SqlParameter param2 = new SqlParameter(); param2.ParameterName = "@username"; param2.Value = patchedUser.username; sqlCommand.CommandText = command; sqlCommand.Parameters.Add(param1); sqlCommand.Parameters.Add(param2); connection = new DataBaseConnectionService(configuration, sqlCommand); await connection.GetData(); } else return true; return true; } catch (Exception error) { return false; } }

I have tested it on PostMan, and it works perfectly. The problem is that I know how to pass a JsonPatchDocument FromBody on PostMan, but I don't know how to do it using C# (I need this to make the call from an APP). I have tried to look for answers regarding this issue, but I have only found information about how to create the API, not about how to call it from C#. That is all, if you need any more information I will provide it as soon as I see your request, thank you all so much for your time, I hope everyone has good day.

EDIT: After diving deeper into this matter, I have found a way that could work, however It returns me a 405 status code ("Method not allowed"): This is the code that I use in my C# App

 public async Task<string> PatchUser(UserModel User_Raw) { if (client == null) InitializeClient(); try { //converts the UserModel to JsonPatchDocument<UserModel> JsonPatchDocument<UserModel> body = new JsonPatchDocument<UserModel>(); body.Replace(e = e, User_Raw); //Converts the JsonPatchDocument<UserModel> to Json var serializedJsonDocument = JsonConvert.SerializeObject(body); var stringUser = new StringContent(serializedJsonDocument, UnicodeEncoding.UTF8, "application/json"); // var request = new HttpRequestMessage(new HttpMethod("PATCH"), "Here goes the URL"); request.Content = stringUser; //response stores the Post result to later ensure that it has been successful var response = await client.SendAsync(request); response.EnsureSuccessStatusCode(); string HttpResponse = await response.Content.ReadAsStringAsync(); return HttpResponse; } catch (HttpRequestException error) { return null; } catch (Exception error) { jsonResult = null; return jsonResult; } }
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Are you asking how to make a PATCH request from a C# application? In that case, why are you showing all the irrelevant server code?

To make a PATCH request, you instantiate an HttpClient, and then do this:

 JsonPatchDocument<User> body = <...>; HttpResponseMessage response = await client.PatchAsync(requestUri, body);

If you're stuck with .NET Framework, you won't have PatchAsync, in which case you have to do something like this:

 var request = new HttpRequestMessage(new HttpMethod("PATCH"), requestUri) { Content = body }; var response = await client.SendAsync(request);
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5 Comments

I showed it because I did not know if it could be relevant or not. I cant use PatchAsync, I don't know why, but it doesn't appear when I use net.http.httpclient
@JaimeSantos I extended the answer. Does that help?
I updated the question trying this, summarizing it, it gave me a 405 error. I could not assign the JsonPatchDocument to the content of the HttpRequestMessage, so I did a couple of things to convert it into a StringContent. I have probably made the conversion wrongly, If you could check it out I would appreciate it. Thank you for your help so far, I feel like I almost got it (:
@JaimeSantos I don't think it's got anything to do with the body (to debug, use a method that doesn't take any body parameter). 405 means that the method is not allowed. If you are hosting on IIS, you may have to edit the web.config: stackoverflow.com/questions/19162825/…
Never mind, I was using the wrong URL, I tried it again and it worked just fine, thank you so much for your help ((((:

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