ios - 发布 header 数据和x-www-form-urlencoded数据时出错

数据在Postman应用程序中有效，但在下面的代码中不起作用，即我收到底部提到的错误。我不明白代码中的错误在哪里。提前致谢。以下是Postman数据的屏幕截图:标头:身体:下面是代码:NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://apifm.azurewebsites.net/api/Checkout/CheckoutOrders"]];// Specify that it will be a POST requestrequest.HTTPMethod = @"POST";[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];[request setValue:@"Bearer VMuEUFkfBSAfMGhCHYVVEpnN7PWj80RdpSBEJ7gPVtaFQ9P6OHDfKepQcEi3dipPAu3rTHQntRRqbktAQur4rIFIEw05DeKwhhAblVBbbWM8Vzx9HGD9Asmv-cRehQbTKnGlvvT7NuYXn1lsSdoRSa4Ut0JvxYZeZRAmygLaylleT9QWrlKCCA1_rM9GJ_KZFzOAG6VwP70jn0UJaHQChPNLB1Ape_KjMlXiqWv0AjyAiGR4QwSOWNVYIv8QdhuhvSoaQFpcipKUvIyG5fmPKyflETswjPTBF5tZhEdP_kBg6xAIPb7pfJqtbxzyvJ7KilAc84PuByWHogwBIvq0vB4x201b9dBwrJfsxKQB0yEJd9AwqtW8iGFuEdHIfkjyCXjsKAIx4szFS6gaOcQDPTsob25TSEiYAMMlbis7Olbv0lTd6-RSB1Q1KFFERIXszCKCdvznpVMdCST1zaQ3ug" forHTTPHeaderField:@"Authorization"];NSMutableDictionary *postDict = [[NSMutableDictionary alloc] init];[postDict setValue:@"39399393" forKey:@"UserPhone"];[postDict setValue:@"Manohar" forKey:@"firstName"];[postDict setValue:@"Adhikari" forKey:@"lastName"];[postDict setValue:@"[email protected]" forKey:@"Email"];[postDict setValue:@"9988989800" forKey:@"Phone1"];[postDict setValue:@"" forKey:@"Phone2"];[postDict setValue:@"na" forKey:@"Organization"];[postDict setValue:@"Naxal, Kathmandu 44600, Nepal" forKey:@"Address1"];[postDict setValue:@"this is new address" forKey:@"Address2"];[postDict setValue:@"1" forKey:@"PaymentOption"];[postDict setValue:@"DELIVERY" forKey:@"DeliveryType"];[postDict setValue:@"0" forKey:@"OrderId"];[postDict setValue:@"128" forKey:@"VendorId"];[postDict setValue:@"3108" forKey:@"ShippingAddressId"];[postDict setValue:@"0" forKey:@"BillingAddressId"];[postDict setValue:@"Here goes special instruction of the customer" forKey:@"OrderNote"];[postDict setValue:@"null" forKey:@"DeliveryDateTime"];[postDict setValue:@"192.168.0.5" forKey:@"CustomerIp"];[postDict setValue:@"54" forKey:@"DeliveryCharge"];NSData *jsonData = [NSJSONSerialization dataWithJSONObject:postDict options:0 error:nil];// Checking the formatNSString *urlString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];// Convert your data and set your request's HTTPBody propertyNSString *stringData = [[NSString alloc] initWithFormat:@"jsonRequest=%@", urlString];NSData *requestBodyData = [stringData dataUsingEncoding:NSUTF8StringEncoding];request.HTTPBody = requestBodyData;[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { if (!connectionError) { NSLog(@"response--%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); } else{ NSLog(@"error--%@",connectionError); }}];以下是我得到的错误: 响应-{“消息”:“有错误 “，” ExceptionMessage“:”对象引用未设置为实例 的 对象。“，” ExceptionType“:” System.NullReferenceException“，” StackTrace“:” 在Foodmandu.Models.DAL.DALCheckOut.checkOutOrders(JObject Jobj，Int32 UserId)\ r \ n位于 Foodmandu.Areas.API.CheckOutController.CheckOutOrders(JObject Jobj)\ r \ n在lambda_method(Closure，Object，Object [])\ r \ n在 System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor。 c__DisplayClass10.b__9(Object 实例，Object [] methodParameters)\ r \ n位于 System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object 实例，Object []参数)\ r \ n位于 System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext，IDictionary`2参数，CancellationToken cancelToken)\ r \ n ---上一个位置的堆栈结束跟踪 引发异常的位置--- \ r \ n System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(任务 任务)\ r \ n System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(任务 任务)\ r \ n System.Web.Http.Controllers.ApiControllerActionInvoker.d__0.MoveNext()\ r \ n-- 从先前引发异常的位置开始的堆栈跟踪结束 --- \ r \ n在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(任务 任务)\ r \ n System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(任务 任务)\ r \ n System.Web.Http.Controllers.ActionFilterResult.d__2.MoveNext()\ r \ n --- 从先前引发异常的位置开始的堆栈跟踪结束 --- \ r \ n在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(任务 任务)\ r \ n System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(任务 任务)\ r \ n System.Web.Http.Filters.AuthorizationFilterAttribute.d__2.MoveNext()\ r \ n --- 从先前引发异常的位置开始的堆栈跟踪结束 --- \ r \ n在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(任务 任务)\ r \ n System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(任务 任务)\ r \ n System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()“} 最佳答案 我的建议-如果您不想使用AFNetworking，请将AFURLRequestSerialization作为依赖项。用于通过它创建请求。仅在项目中添加AFURLRequestSerialization.h / m文件(+许可证文件)。或自行编写序列化代码。NSDictionary *postDict = @{ @"UserPhone" : @"39399393", @"firstName" : @"Manohar", .... };AFURLRequestSerialization *serializer = [AFURLRequestSerialization serializer];NSString *urlString = @"https://YOUR_URL";NSError *error = nil;NSMutableURLRequest *request = [serializer requestWithMethod:@"POST" URLString:urlString parameters:postDict error:error];if (error) { // check error}// Your custom http-header values[request setValue:@"VALUE" forHTTPHeaderField:@"KEY"];// send request[NSURLConnection sendAsynchronousRequest:....];关于ios - 发布 header 数据和x-www-form-urlencoded数据时出错，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/31292204/