并非所有代码路径都返回值WCF Service

本文关键字：返回值 WCF Service 路径 代码 | 更新日期: 2023-09-27 18:05:39

你好，我正忙着连接我的SQL数据库到我的WCF RESTful服务。这是我的问题: WebService.Service1.GetAllTrucks(string)': not all code paths return a value。每个报价都有一个或多个与外键连接的卡车，我希望能够查看每个报价中的每个卡车(我试图在方法:'GetAllTrucks'中做到这一点)。

IService1.cs 

        [OperationContract]
        [WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped, UriTemplate = "getTrucks")]
        List<wsTrucks> GetTrucks();
        [OperationContract]
        [WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped, UriTemplate = "getAllTrucks/{truckID}")]
        List<wsQuote> GetAllTrucks(string truckID);

Service1.svc.cs 

  public List<wsTrucks> GetTrucks()
        {
            NorthwindDataContext dc = new NorthwindDataContext();
            List<wsTrucks> results = new List<wsTrucks>();
            foreach (tblTruck truck in dc.tblTrucks)
            {
                results.Add(new wsTrucks()
                    {
                        TruckID = truck.ID,
                        TrucksName = truck.TRUCKNAME
                    });
            }
            return results;
        }
        public List<wsQuote> GetAllTrucks(string truckID)
        {
            NorthwindDataContext dc = new NorthwindDataContext();
            List<wsQuote> results = new List<wsQuote>();
            System.Globalization.CultureInfo ci = System.Globalization.CultureInfo.GetCultureInfo("en-US");
            foreach (tblQuote quote in dc.tblQuotes.Where(s => s.ID.ToString() == truckID))
            {
                results.Add(new wsQuote()
                    {
                        QuoteID = quote.ID,
                        QuoteNumber = quote.QUOTENUMBER
                    });
                return results;
            }
        }

" 

[DataContract]
    public class wsQuote
    {
        [DataMember]
        public int QuoteID { get; set; }
        [DataMember]
        public string QuoteNumber { get; set; }
    }
<<p> 卡车/strong> 
[DataContract]
    public class wsTrucks
    {
        [DataMember]
        public int TruckID { get; set; }
        [DataMember]
        public string TrucksName { get; set; }
    }

谢谢。

并非所有代码路径都返回值WCF Service

您应该能够通过将GetAllTrucks(string truckID)方法中的return results移动到循环之后来解决此问题:

    public List<wsQuote> GetAllTrucks(string truckID)
    {
        NorthwindDataContext dc = new NorthwindDataContext();
        List<wsQuote> results = new List<wsQuote>();
        System.Globalization.CultureInfo ci = System.Globalization.CultureInfo.GetCultureInfo("en-US");
        foreach (tblQuote quote in dc.tblQuotes.Where(s => s.ID.ToString() == truckID))
        {
            results.Add(new wsQuote()
                {
                    QuoteID = quote.ID,
                    QuoteNumber = quote.QUOTENUMBER
                });
            // return results; <----- HERE! Move this to after the loop
        }
        return results; // Move it here.
    }

问题是，如果列表为空，则会跳过foreach循环的主体，并且循环后没有返回语句要执行。

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