I have problem getting a "CodeFluent.Runtime.CodeFluentDuplicateException" and i'm probably missing something fundamental.
However i first followed this blog about using Servicestack and codefluents and made my own template.
I have no problems to get entities but doing a put give me an exception mentioned.
Ok maybe i have done some wrong in my template so i took another approach looking for answers i found a "complete" project using Webapi and a template, ready to use. Generate ASP .NET Web API Controllers using Templates.
This generates all the controllers and seems to work. However i have the same exeption when using the "put".
This is an example of generated controller code for Put
public HttpResponseMessage Put([FromBody]Country value)
{
if (value == null || !value.Save())
{
return Request.CreateResponse(HttpStatusCode.BadRequest);
}
return Request.CreateResponse(HttpStatusCode.OK, value);
}
This is how i use the controller above inside a Xamarin.Forms solution.
public async Task UpdateAsync(Country update, bool isNewItem=false)
{
HttpClient client = new HttpClient();
// RestUrl = http://developer.xamarin.com:8081/api/todoitems{0}
var uri = new Uri(string.Format(Constants.RestUrl2, update.Id));
try
{
var json = JsonConvert.SerializeObject(update);
var content = new StringContent(json, Encoding.UTF8, "application/json");
HttpResponseMessage response = null;
if (isNewItem)
{
response = await client.PostAsync(uri, content);
}
else
{
response = await client.PutAsync(uri, content);
}
if (response.IsSuccessStatusCode)
{
Debug.WriteLine(#" TodoItem successfully saved.");
}
}
catch (Exception ex)
{
Debug.WriteLine(#" ERROR {0}", ex.Message);
}
}
Any suggestions of what i'm missing?
Thanks for any help
//Greg
I got the answer from the softfluent support
"..
Another case of duplicate exception is when you enable optimistic concurrency and the RowVersion of the instance you are updating is null. In this case, the stored procedure will insert the row instead of updating it.
.."
Changeing the concurrencyMode=None did the trick
Related
My API was as follows:
[HttpPut("{id}")]
public async Task<ActionResult<HomeContextModel>> EditHomeContext(int id, string title, string context, string subcontext, IFormFile imageFile)
{
HomeContextModel homeContextModel = await _context.HomeContext.Include(x => x.Image).Include(x => x.Button).Include(x => x.Logo).ThenInclude(y => y.Image)
.FirstOrDefaultAsync(m => m.Context_Id == id);
//HomeContextModel homeContextModel = await GetHomeContextModel(id);
if (homeContextModel == null)
{
return BadRequest("Context Id cannot be null");
}
if (imageFile != null)
{
ImageModel imageModel = homeContextModel.Image;
if (imageModel != null)
{
string cloudDomain = "https://privacy-web.conveyor.cloud";
string uploadPath = _webHostEnvironment.WebRootPath + "\\Images\\";
if (!Directory.Exists(uploadPath))
{
Directory.CreateDirectory(uploadPath);
}
string filePath = uploadPath + imageFile.FileName;
using (var fileStream = new FileStream(filePath, FileMode.Create))
{
await imageFile.CopyToAsync(fileStream);
await fileStream.FlushAsync();
}
using (var memoryStream = new MemoryStream())
{
await imageFile.CopyToAsync(memoryStream);
imageModel.Image_Byte = memoryStream.ToArray();
}
imageModel.ImagePath = cloudDomain + "/Images/" + imageFile.FileName;
imageModel.Modify_By = "CMS Admin";
imageModel.Modity_dt = DateTime.Now;
//_context.Update(imageModel);
}
}
homeContextModel.Title = title;
homeContextModel.Context = context;
homeContextModel.SubContext = subcontext;
_context.Entry(homeContextModel).State = EntityState.Modified;
try
{
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!HomeContextModelExists(homeContextModel.Context_Id))
{
return NotFound();
}
else
{
throw;
}
}
return Ok("Home Context Edit Successfully");
}
It's an API for the Content Management System (CMS) to change the content of the Homepage using a Flutter webpage that make put request onto this API.
Everything works fine. In the last few days, where I tested and tested again during the development. So before today, I've wrapped up them and submitted to the necessary place (It's a university FYP).
Until now it cause me this error when I was using this to prepare my presentation:
Error 400 failed to read the request form Unexpected end of stream ..."
After all the tested I tried:
Internet solutions
restore the database
repair Microsoft VS 2019 (As this issue was fixed before after I
updated my VS 2019 from 16.8. to the latest 16.11.7)
Use the ASP .NET file which didn't caused this issue before
Then I realized it may be because of I used another older ASP file to accessed the same database before. Does this really cause this matter?
If yes, then now how should I solved it, with the action I already done (listed as above)?
EDIT: Additional description to the situation
The above API I set breakpoint before, on the first line, using Swagger to test it.
It turns out that it didn't go into the API and straightaway return the error 400
REST API can have parameters in at least two ways:
As part of the URL-path
(i.e. /api/resource/parametervalue)
As a query argument
(i.e. /api/resource?parameter=value)
You are passing your parameters as a query instead of a path as indicated in your code. And that is why it is not executing your code and returning 400.
I have an ASP.NET Core website, using EFCore.
I would like to do some work like logging to the database, but after having sent the response to the user in order to answer faster.
I could do it in a different thread, but due to async access of the DbContext I am not sure it is safe. Is there any recommended way to do that?
public async Task<IActionResult> Request([FromForm]RequestViewModel model, string returnUrl = null)
{
try
{
var newModel = new ResponseViewModel(model);
// Some work
return View("RequestView",newModel)
}
finally
{
// Some analysis on the request
// I would like to defer this part
await Log(model);
}
}
One of the reason is that I would like to call a web-service (geocoding), which is not needed to answer, but good to work on the log (I need the city/country of coordinates).
I see this has never been answered, but actually have a solution.
The simple solution:
public async Task<IActionResult> Request([FromForm]RequestViewModel model, string returnUrl = null)
{
try
{
var newModel = new ResponseViewModel(model);
// Some work
return View("RequestView",newModel)
}
finally
{
Response.OnCompleted(async () =>
{
// Do some work here
await Log(model);
});
}
}
The secure solution, as OnCompleted used to be called before the response being sent, so delaying the response:
public static void OnCompleted2(this HttpResponse resp, Func<Task> callback)
{
resp.OnCompleted(() =>
{
Task.Run(() => { try { callback.Invoke(); } catch {} });
return Task.CompletedTask;
});
}
and call Response.OnCompleted2(async () => { /* some async work */ })
Building on Jeans answer and a question and answer on the try - return - finally pattern, the try and finally blocks can be removed (if you don't really want to catch an exception).
This leads to the following code:
public async Task<IActionResult> Request([FromForm] RequestViewModel model, string returnUrl = null)
{
var newModel = new ResponseViewModel(model);
// Some work
Response.OnCompleted(async () =>
{
// Do some work here
await Log(model);
});
return View("RequestView", newModel);
}
There's no out of the box way to do what you want.
But, here's a possible approach:
Have a queue and a worker (thread or process)
Just before the request is sent back to the client, add a message in that queue
The worker will pick up that message at some point in the future, and process it.
Since the worked runs somewhere else and not on the request thread, the server can complete the request thread and the worker can do what's left.
Try using Hangfire. Hangfire is an easy way to perform background processing in .NET and .NET Core applications. No Windows Service or separate process required.
Backed by persistent storage. Open and free for commercial use.
You could do something like
var jobId = BackgroundJob.Enqueue(() => Log(model));
And here is my blog post on using HangFire in ASP.NET Core
Create a new class that inherits from ActionFilterAttribute, overwrite the OnResultExecuted method to perform the logging and then apply your attribute class to the controller actions you want to do logging.
I'm new to Xamarin and developing native apps in general (I have made html5 apps in the past).
I have started on a Xamarin.Forms project and I'm trying to contact a REST like API (need to GET an URL which will return a json array).
Normally from C# I would use RestSharp and perform this call using the RestClient.
I'm not having any luck installing that package from Xamarin Studio though, but I have got the Microsoft HTTP Libraries installed.
I'm pretty sure this is a very trivial task to perform, I just haven't been able to adapt the samples I have found online to work for me.
Anyone who could post how this is done please (remember I'm new to this so don't expect me to understand everything that is different from say a normal console app)?
It is easy with HTTP Client and JSON.NET here is a example of a GET:
public async Task<List<Appointment>> GetDayAppointments(DateTime day)
{
HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization", "Bearer " + App.apiToken);
//Your url.
string resourceUri = ApiBaseAddress;
HttpResponseMessage result = await client.GetAsync (resourceUri, CancellationToken.None);
if (result.IsSuccessStatusCode) {
try {
return GetDayAppointmentsList(result);
} catch (Exception ex) {
Console.WriteLine (ex.Message);
}
} else {
if(TokenExpired(result)){
App.SessionExpired = true;
App.ShowLogin();
}
return null;
}
return null;
}
private List<Appointment> GetDayAppointmentsList(HttpResponseMessage result){
string content = result.Content.ReadAsStringAsync ().Result;
JObject jresponse = JObject.Parse (content);
var jarray = jresponse ["citas"];
List<Appointment> AppoinmentsList = new List<Appointment> ();
foreach (var jObj in jarray) {
Appointment newApt = new Appointment ();
newApt.Guid = (int)jObj ["id"];
newApt.PatientId = (string)jObj ["paciente"];
newApt.Name = (string)jObj ["nombre"];
newApt.FatherLstName = (string)jObj ["paterno"];
newApt.MotherLstName = (string)jObj ["materno"];
string strStart = (string)jObj ["horaIni"];
TimeSpan start;
TimeSpan.TryParse (strStart, out start);
newApt.StartDate = start;
string strEnd = (string)jObj ["horaFin"];
TimeSpan end;
TimeSpan.TryParse (strEnd, out end);
newApt.EndDate = end;
AppoinmentsList.Add (newApt);
}
return AppoinmentsList;
}
I use System.Net.WebClient and our asp.net WebAPI interface:
public string GetData(Uri uri)
{//uri like "https://webapi.main.cz/api/root"
string ret = "ERROR";
try
{
using (WebClient webClient = new WebClient())
{
//You can set webClient.Headers there
webClient.Encoding = System.Text.Encoding.UTF8;
ret = webClient.DownloadString(uri));//Test some data received
//In ret you can have JSON string
}
}
catch (Exception ex) { ret = ex.Message; }
return ret;
}
4
public string SendData(Uri uri, byte[] data)
{//uri like https://webapi.main.cz/api/PostCheckLicence/
string ret = "ERROR";
try
{
using (WebClient webClient = new WebClient())
{
webClient.Headers[HttpRequestHeader.Accept] = "application/octet-stream";
webClient.Headers[HttpRequestHeader.ContentType] = "text/bytes";
webClient.Encoding = System.Text.Encoding.ASCII;
byte[] result = webClient.UploadData(uri, data);
ret = Encoding.ASCII.GetString(result);
if (ret.Contains("\"ResultWebApi\":\"OK"))
{//In ret you can have JSON string
}
else
{
}
}
}
catch (Exception ex) { ret = ex.Message; }
return ret;
}
x
I've some examples in my Github repo. Just grab the classes there and give them a try. The API is really easy to use:
await new Request<T>()
.SetHttpMethod(HttpMethod.[Post|Put|Get|Delete].Method) //Obligatory
.SetEndpoint("http://www.yourserver.com/profilepic/") //Obligatory
.SetJsonPayload(someJsonObject) //Optional if you're using Get or Delete, Obligatory if you're using Put or Post
.OnSuccess((serverResponse) => {
//Optional action triggered when you have a succesful 200 response from the server
//serverResponse is of type T
})
.OnNoInternetConnection(() =>
{
// Optional action triggered when you try to make a request without internet connetion
})
.OnRequestStarted(() =>
{
// Optional action triggered always as soon as we start making the request i.e. very useful when
// We want to start an UI related action such as showing a ProgressBar or a Spinner.
})
.OnRequestCompleted(() =>
{
// Optional action triggered always when a request finishes, no matter if it finished successufully or
// It failed. It's useful for when you need to finish some UI related action such as hiding a ProgressBar or
// a Spinner.
})
.OnError((exception) =>
{
// Optional action triggered always when something went wrong it can be caused by a server-side error, for
// example a internal server error or for something in the callbacks, for example a NullPointerException.
})
.OnHttpError((httpErrorStatus) =>
{
// Optional action triggered when something when sending a request, for example, the server returned a internal
// server error, a bad request error, an unauthorize error, etc. The httpErrorStatus variable is the error code.
})
.OnBadRequest(() =>
{
// Optional action triggered when the server returned a bad request error.
})
.OnUnauthorize(() =>
{
// Optional action triggered when the server returned an unauthorize error.
})
.OnInternalServerError(() =>
{
// Optional action triggered when the server returned an internal server error.
})
//AND THERE'S A LOT MORE OF CALLBACKS THAT YOU CAN HOOK OF, CHECK THE REQUEST CLASS TO MORE INFO.
.Start();
And there's a couple of examples.
For all my Xamarin Forms app I use Tiny.RestClient.
It's easy to get it and easy to use it.
You have to download this nuget.
And after it just very easy to use it :
var client = new TinyRestClient(new HttpClient(), "http://MyAPI.com/api");
var cities = client.
GetRequest("City").
AddQueryParameter("id", 2).
AddQueryParameter("country", "France").
ExecuteAsync<City>> ();
Hopes that helps.
I am trying to make offline sync to table from azure mobile service. My Xamarin Form version is 1.4.2.6359.
I try to test my code in OnCreate method of MainActivity. All preparation steps such as MobileServiceClient initialization, MobileServiceSQLiteStore initialization, SyncTable creation, etc are ok.
When I try to call PullAsync, I am getting NullReferenceException. I capture the package using Package Capture App from mobile. The request goes to Azure Mobile service and it returns the correct json data successfully.
When I try the same code in Xamarin Android project (not Xamarin Form), it is working fine.
To reproduce the issue.
Just create Xamarin Form (Portable) project and use my code.
My Code
private async Task Test() {
const string applicationURL = #"https://xxxx.azure-mobile.net/";
const string applicationKey = #"xxxx";
CurrentPlatform.Init();
var client = new MobileServiceClient(applicationURL, applicationKey);
string path = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "store.db");
if (!File.Exists(path)) {
File.Create(path).Dispose();
}
var store = new MobileServiceSQLiteStore(path);
store.DefineTable<Product>();
await client.SyncContext.InitializeAsync(store);
var productTable = client.GetSyncTable<Product>();
try {
await client.SyncContext.PushAsync();
await productTable.PullAsync("allProducts", productTable.CreateQuery());
var t = await productTable.ToListAsync();
Console.WriteLine("Product Count : " + t.Count);
}
catch (Java.Net.MalformedURLException ex) {
Console.WriteLine(ex.Message);
}
catch (Exception e) {
Console.WriteLine(e.Message);
}
}
References:
http://azure.microsoft.com/en-us/documentation/articles/mobile-services-xamarin-android-get-started-offline-data/
http://blogs.msdn.com/b/carlosfigueira/archive/2014/04/07/deep-dive-on-the-offline-support-in-the-azure-mobile-service-managed-client-sdk.aspx
I got the solution for this case.
As far as my understanding, this is what is happening. During the application is loading, I call PullAsync. It is async call and during this call, application keeps loading other components. The actual NullReferenceException is coming from OnPrepareOptionsMenu function (Xamarin.Forms.Platform.Android.AndroidActivity.OnPrepareOptionsMenu). The exception is happening on other thread and the thread simply dies. That's why I cannot get stack trace from my main thread.
This NullReferenceException issue is totally not related to Azure Mobile Service.
I override OnPrepareOptionsMenu in MainActivity and add try-catch block to base class function call. The problem is solved. Here is my code in MainActivity class.
public override bool OnPrepareOptionsMenu(IMenu menu) {
try {
// I am always getting menu.HasVisibleItems = false in my app
if (menu != null && menu.HasVisibleItems) {
// Exception is happening when the following code is executed
var result = base.OnPrepareOptionsMenu(menu);
return result;
}
}
catch{
}
return true;
}
I don't really understand why it is happening. Please point me out if you have better understanding of this case and better solution.
I think my issue is same as this : http://forums.xamarin.com/discussion/23579/exception-whilte-trying-to-open-activity-from-xamarin-forms-page
I'm trying to update a record residing in salesforce table. Im using the Java HttpClient REST API to do the same. Getting an error when we use PATCH to update a record in Salesforce.
PostMethod post = new PostMethod(
instanceUrl + "/services/data/v20.0/sobjects/" +
objectName + "/" + Id + "?_HttpMethod=PATCH"
);
[{"message":"HTTP Method 'PATCH' not allowed. Allowed are HEAD,GET,POST","errorCode":"METHOD_NOT_ALLOWED"}]
Also tried doing the following:
PostMethod post = new PostMethod(
instanceUrl + "/services/data/v20.0/sobjects/" + objectName + "/" + Id)
{
public String getName() { return "PATCH";
}
};
This also returns the same error. We are using apache tomcat with commons-httpclient-3.1.jar library. Please advise on how this can be done.
Please check if you you're using the right implementation of PATCH method, see: Insert or Update (Upsert) a Record Using an External ID.
Also check if your REST URL is correct, probably your objectId is not passed in correctly from Javascript.
The ObjectName is the Name of an Salesforce table i.e. 'Contact'. And Id is the Id of a specific record you want to update in the table.
Similar:
Can I update without an ID?
for Drupal: How to deal with SalesforceException: HTTP Method 'PATCH' not allowed. Allowed are HEAD,GET,POST
As I think you're aware, commons httpclient 3.1 does not have the PATCH method, and the library has been end-of-lifed. In your code above, you're trying to add the HTTP method as a query parameter, which doesn't really make sense.
As seen on SalesForce Developer Board, you can do something like this instead:
HttpClient httpclient = new HttpClient();
PostMethod patch = new PostMethod(url) {
#Override
public String getName() {
return "PATCH";
}
};
ObjectMapper mapper = new ObjectMapper();
StringRequestEntity sre = new StringRequestEntity(mapper.writeValueAsString(data), "application/json", "UTF-8");
patch.setRequestEntity(sre);
httpclient.executeMethod(patch);
This allows you to PATCH without switching out your httpclient library.
I created this method to send the patch request via the Java HttpClient class.
I am using JDK V.13
private static VarHandle Modifiers; // This method and var handler are for patch method
private static void allowMethods(){
// This is the setup for patch method
System.out.println("Ignore following warnings, they showed up cause we are changing some basic variables.");
try {
var lookUp = MethodHandles.privateLookupIn(Field.class, MethodHandles.lookup());
Modifiers = lookUp.findVarHandle(Field.class, "modifiers", int.class);
} catch (IllegalAccessException | NoSuchFieldException e) {
e.printStackTrace();
}
try {
Field methodField = HttpURLConnection.class.getDeclaredField("methods");
methodField.setAccessible(true);
int mods = methodField.getModifiers();
if (Modifier.isFinal(mods)) {
Modifiers.set(methodField, mods & ~Modifier.FINAL);
}
String[] oldMethods = (String[])methodField.get(null);
Set<String> methodsSet = new LinkedHashSet<String>(Arrays.asList(oldMethods));
methodsSet.addAll(Collections.singletonList("PATCH"));
String[] newMethods = methodsSet.toArray(new String[0]);
methodField.set(null, newMethods);
} catch (NoSuchFieldException | IllegalAccessException e) {
e.printStackTrace();
}
}