Entity Framework存储过程返回null对象

Question

I have an ASP.NET MVC site and I want to display some details from a stored procedure. I have done the exact same thing before with other stored procedures on different pages in the same app and it has worked, but this stored procedure call returns a null object instead of the expected value.

EF call to stored procedure:

public MostRecentOrderDetail GetMostRecentOrder(int userId)
{
    var context = new myDatabaseContext();
    var paramUserId = new SqlParameter { ParameterName = "viUserId", Value = userId };
    var result = context.Database.SqlQuery<MostRecentOrderDetail>("usp#GetMostRecentOrder @viUserId", paramUserId).FirstOrDefault();
    return result;
}

In my controller I call it using:

MostRecentOrderDetail latestOrder = myDB.GetMostRecentOrder(CurrentUser.UserId).FirstOrDefault();

When I call the stored procedure in SQL Server Management Studio it returns a single row table populated with the correct values, I just cannot seem to get my ASP.NET MVC site to see it.

The MVC site uses code-first, and the MostRecentOrderDetail object is correctly mapped to the columns of the stored procedure.

*EDIT

I have updated my code as @DanielDrews suggested below, and am now receiving an exception, which I think is a step forward:

The data reader is incompatible with the specified 'MyApp.Models.MostRecentOrderDetail'. A member of the type, 'OrderTypeCode', does not have a corresponding column in the data reader with the same name. 

I believe my model is being mapped correctly.

myDatabaseContext.cs

public partial class myDatabaseContext : DbContext
{
    // Database Initializer etc

    public IDbSet<MostRecentOrderDetail> MostRecentOrderDetails { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        // ... Other Maps
        modelBuilder.Configurations.Add(new MostRecentOrderMap());
    }
    // GetMostRecentOrder() function from above
}

MostRecentOrderMap.cs

 public class MostRecentOrderMap : EntityTypeConfiguration<MostRecentOrderDetail>
    {
        public MostRecentOrderMap()
            {    
                // Table and Column Mappings
                this.ToTable("usp#GetMostRecentOrder");

                this.Property(t => t.OrderTypeCode).HasColumnName("order_type_code");
                this.Property(t => t.OrderStatusCode).HasColumnName("order_status_code");
                this.Property(t => t.OrderReceivedDate).HasColumnName("order_received_date");
                this.Property(t => t.OrderShippedDate).HasColumnName("order_shipped_date");    
            }

    }

MostRecentOrderDetail.cs

public class MostRecentOrderDetail
{
    [Key]
    public string OrderTypeCode { get; set; }
    public string OrderStatusCode { get; set; }
    public DateTime OrderReceivedDate { get; set; }
    public DateTime OrderShippedDate { get; set; }
}

The stored procedure itself:

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[usp#GetMostRecentOrder]
         @viUserId int
AS
begin
SELECT TOP 1    o.order_type_code, 
        o.order_status_code,
        o.order_received_date, 
        o.order_shipped_date 
FROM    ORDER_TABLE o 
WHERE   o.user_id = @viUserId
end

Answer 1

This could be a problem with the parameter viUserId (value is correct?), try to initialize like this:

var paramUserId = new SqlParameter { ParameterName = "viUserId", Value = userId };

in my applications i've call procedures a little bit diferent. Translating to your problems should be like that:

var paramUserId = new SqlParameter { ParameterName = "viUserId", Value = userId };
var result = this.DbContext.Database.SqlQuery<MostRecentOrderDetail>("usp#GetMostRecentOrder @viUserId", paramUserId).FirstOrDefault();

And one last thing. be sure they have the same types (mapping and database). this could lead to an exception

*EDIT

The procedure need to return all properties from your model (the same name). procedure returns 'order_type_code' but model expects OrderTypeCode.

Answer 2

There is a typo in your parameter code. Your missing @ in "viUserId"

UserID = new SqlParameter("@viUserId", userId);