C# 并非所有代码路径都返回值WCF Service

嗨，我正忙着将我的SQL数据库连接到我的WCF RESTful服务这是我的问题：

WebService.Service1.GetAllTrucks（string）'：并非所有代码路径都返回值

。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（我正在尝试使用以下方法：“GetAllTrucks”）

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);

  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 wsTrucks
    {
        [DataMember]
        public int TruckID { get; set; }

        [DataMember]
        public string TrucksName { get; set; }
    }

卡车

        [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);

  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 wsTrucks
    {
        [DataMember]
        public int TruckID { get; set; }

        [DataMember]
        public string TrucksName { get; set; }
    }

---

谢谢。

您应该能够通过将GetAllTrucks（string truckID）方法中的

返回结果

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.
    }

公共列表GetAllTrucks（字符串truckID）
{
NorthwindDataContext dc=新的NorthwindDataContext（）；
列表结果=新列表（）；
System.Globalization.CultureInfo ci=System.Globalization.CultureInfo.GetCultureInfo（“en-US”）；
foreach（dc.tblQuotes.Where中的tblQuote（s=>s.ID.ToString（）==truckID））
{
结果。添加（新wsQuote（）
{
QuoteID=quote.ID，
QuoteNumber=quote.QuoteNumber
});
//返回结果；
foreach
可能不会发生，并且在这种情况下没有
return
。将返回结果放入；移出foreachmove
return结果；
移出foreach循环谢谢！太愚蠢了！@推断我不知道你有我的投票权谢谢@MattheWatson@RenaldoGeldenhuis干杯。有时候我们会变得不知所措ng.：）还有我的支持票……因为这就是我要说的