WCF POST - 返回Null

Question

我在这个项目上遇到了一些麻烦。我是WCF和Web服务的新手，我需要通过POST接收数据，并且我得到了一个具有POST功能的小项目。

IBookService.cs

namespace SimpleRESTServiceCRUD
{
    [ServiceContract]
    public interface IBookService
    {
       [OperationContract]
       [WebInvoke(Method = "GET", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Xml, UriTemplate = "Books/")]
       List<Book> GetBookList();

       [OperationContract]
       [WebInvoke(Method = "GET", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "Book/{id}")]
       Book GetBookById(string id);

       [OperationContract]
       [WebInvoke(Method = "PUT", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "AddBook/{id}")]
       string AddBook(Book book, string id);

       [OperationContract]
       [WebInvoke(Method = "PUT", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "UpdateBook/{id}")]
        string UpdateBook(Book book, string id);

       [OperationContract]
       [WebInvoke(Method = "DELETE", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "DeleteBook/{id}")]
       string DeleteBook(string id);

       [OperationContract]
       [WebInvoke(Method = "POST",
             BodyStyle = WebMessageBodyStyle.Bare,
            RequestFormat= WebMessageFormat.Json,                   
                    ResponseFormat = WebMessageFormat.Json,
                    UriTemplate = "SaveBook")]
        string SaveBook(String book);
      }
}

BookService.svc.cs

namespace SimpleRESTServiceCRUD
{
    public class BookService : IBookService
    {
        static IBookRepository repository = new BookRepository();
        public List<Book> GetBookList()
        {
              return repository.GetAllBooks();
        }    

        public Book GetBookById(string id)
        {
              return repository.GetBookById(int.Parse(id));
        }

        public string AddBook(Book book, string id)
        {
              Book newBook = repository.AddNewBook(book);
              return "id=" + newBook.BookId;
        }
        public string UpdateBook(Book book, string id)
        {
              bool updated = repository.UpdateABook(book);
              if (updated)
                    return "Book with id = " + id + " updated successfully";
             else
                   return "Unable to update book with id = " + id;
        }

        public string DeleteBook(string id)
        {
                  bool deleted = repository.DeleteABook(int.Parse(id));
                  if (deleted)
                        return "Book with id = " + id + " deleted successfully.";
                  else
                        return "Unable to delete book with id = " + id;
        }
        public string SaveBook(String book)
        {
            var a = book;
            // newBook = repository.AddNewBook(book);
            return "id=" + book.ToString();
        }
      }
}

我一直在尝试使用名为Postman - REST Client的Chrome扩展程序，var book总是返回NULL。它永远不会返回我通过Postman发送的价值。

我一直在寻找各处，我找不到适合我的解决方案。

正如我所说，我对这个主题缺乏了解，所以如果有人可以帮我解决这个问题，或者可以帮助我更简单地解释一下带有POST的WCF，我会很高兴。