Getting ArcGIS Online OAuth2 access token via c#

Question

I'm trying to get a token for ArcGIS Online using c# (well, more specifically SSIS). I've got a url I can use which works well, and I can hit it and get what I need in Chrome, but it won't work through c# using a WebClient. I can get other jsons through it through SSIS/C# WebClient, but NOT ArcGIS Online for some reason. The url works through Chrome, but won't yield an answer through SSIS/C# WebClient. My code (with client id/secret/credentials) is: string webResource = "https://mymaps.maps.arcgis.com/sharing/rest/oauth2/token?client_id=MYCLIENTID&client_secret=MYCLIENTSECRET&grant_type=client_credentials";WebClient wc = new WebClient();string json = wc.DownloadString(webResource); I would then parse the json. Currently I'm getting: DTS Script Task has encountered an exception in user code: project name: ST_0a306cf2e1634509bea49b75b7d93265 Exception has been thrown by the target of an invocation. at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams) at Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTATaskScriptingEngine.ExecuteScript() I have created an application, as described in https://developers.arcgis.com/labs/rest/get-an-access-token/ An example of the returned json (through Chrome) is: {"access_token":"blahblahblahcrazywords..","expires_in":7200}

nicogis · Answer

Try with RestSharp ( https://restsharp.dev/getting-started/ ) RestRequest r = new RestRequest("https://...../sharing/rest/oauth2/token/"); r.AddParameter("client_id","ewrwerwerwerwewer"); r.AddParameter("client_secret","assfwerwerwerwerewrwerwerfgfg"); r.AddParameter("grant_type","client_credentials"); r.Method = RestSharp.Method.POST; r.RequestFormat = DataFormat.Json; RestClient c = new RestClient(); IRestResponse rs = c.Execute(r); JsonDeserializer a = new JsonDeserializer(); Dictionary<string, string> d = a.Deserialize<Dictionary<string, string>>(rs); d["access_token"];‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍