public IActionResult Api() { Stream stream = null; var allParameters = new NameValueCollection(); foreach (var parameter in Request.Query) { allParameters.Add(parameter.Key, parameter.Value); //parameter.Value.First() } if (Request.Method.Equals(Http.Post, StringComparison.OrdinalIgnoreCase)) { var keys = allParameters.AllKeys; foreach (var parameter in Request.Form) { if (!keys.Contains(parameter.Key)) { allParameters.Add(parameter.Key, parameter.Value); //parameter.Value.First() } } if (Request.Form.Files != null && Request.Form.Files.Count > 0) { stream = Request.Form.Files[0].OpenReadStream(); } } if (allParameters["operation"].Equals("save", StringComparison.InvariantCultureIgnoreCase)) { allParameters["schemecode"] = "super"; } var result = _workflowService.Designer(allParameters, stream); if (allParameters["operation"].Equals("downloadscheme", StringComparison.InvariantCultureIgnoreCase)) { return(File(Encoding.UTF8.GetBytes(result), "text/xml", "scheme.xml")); } return(Content(result)); }