WEB API中通过方法重载传递多个参数 [英] multiple parameters passing with method overloading in WEB API

问题描述

我在存储库类中有以下方法

I have following methods in Repository Class

    public class LibraryRepository : IBookRepository
    {
        LibraryContext context = new LibraryContext();

        public decimal findBookPrice(int book_id)
        {
            var bookprice = (
                            from r in context.Books
                            where r.Book_Id == book_id
                            select r.Price
                            ).FirstOrDefault();

            return bookprice;

        }

        public decimal findBookPrice(int book_id, string bookname)
        {
            var bookprice = (
                             from book in context.Books
                             where book.Book_Id == book_id & book.Book_Title == bookname
                             select book.Price
                             ).FirstOrDefault();

            return bookprice;

        }  

    }

然后，我尝试在Web API中分别获取这两种方法

Then I'm trying to get those two methods separately in Web API

    public class BooksWithAuthersController : ApiController
    {

        private LibraryRepository db = new LibraryRepository();

        // GET: api/BooksWithAuthers/id/Price  

        [ResponseType(typeof(decimal))]
        [Route("api/BooksWithAuthers/{id}/Price")]
        public IHttpActionResult GetBooksPriceById(int id)
        {
            decimal bookprice = db.findBookPrice(id);

            return Ok(bookprice);
        }

        // GET: api/BooksWithAuthers/id,name/Price

        [ResponseType(typeof(decimal))]
        [Route("api/BooksWithAuthers/{id,name}/Price")]
        public IHttpActionResult GetBooksPriceById(int id,string name)
        {
            decimal bookprice = db.findBookPrice(id,name);

            return Ok(bookprice);
        }
    }

第一种方法可以正常工作，但是如何处理具有多个参数的方案

Here first method working fine, but How can I handle scenario with multiple parameters

推荐答案

我不确定这个 {id，name} 甚至是否可能.由于路由模块读取5，因此您正在获取异常.，测试为单个属性，并且无法将其序列化为方法

I am not sure if this {id,name} is even possible.You are getting the exception because routing module is reading 5,test as single attribute and is not able serialize it to int for method

公共IHttpActionResult GetBooksPriceById(int id)

您需要根据可空类型(int?)更改以下方法，并更改路由

You need to change your methods as below considering nullable types (int?) and also change the route

[ResponseType(typeof(decimal))]
[Route("api/BooksWithAuthers/{id}/Price")]
public IHttpActionResult GetBooksPriceById(int? id)
{
   decimal bookprice = db.findBookPrice(id);
   return Ok(bookprice);
}


[ResponseType(typeof(decimal))]
[Route("api/BooksWithAuthers/{id}/{name}/Price")]
public IHttpActionResult GetBooksPriceById(int? id,string name = null)
{
    decimal bookprice = db.findBookPrice(id,name);

    return Ok(bookprice);
}

参考- https://msdn.microsoft.com/zh-cn/library/1t3y8s4s.aspx

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