c# - 使用 Entity Framework 获取存储过程输出参数会引发映射错误 : The data reader is incompatible with the specified

Question

我正在处理一个遗留应用程序，我正在尝试调用一个返回整数的存储过程，但我遇到了映射错误。错误本身就是这个:

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

我尝试将名称更改为 _intId，因为我知道 Entity Framework 会将所有以 @variable 开头的名称转换为 _variable。

奇怪的是，如果我使用 LinqPad 并调用存储过程，我会得到 @intID 的正确值

这是存储过程:

CREATE PROCEDURE [dbo].[IF_Insert_Incidents_Citizen]
    @chvFolio varchar(50),
    @chvOwner_Name varchar(100),
    @chvOwner_Address varchar(100),
    @dtsDate_Created smalldatetime, 
    @intUser_ID integer, 
    @chvDescription varchar(250), 
    @chvEmail varchar(50), 
    @intIncident_Type_ID integer, 
    @intIncident_Status integer, 
    @intID int Output
AS
    SET nocount on

    DECLARE @intErrorCode INT
    DECLARE @intApp_ID INT

    SELECT @intIncident_Type_ID = CAST(Param_Value AS INT)
    FROM IF_Parameters
    WHERE Param_Name = 'Citizen_Incident_Type_ID'

    BEGIN
        --Get an application id
        INSERT INTO MasterApplication (DateCreated) 
        VALUES (getdate())

        SELECT @intApp_ID = SCOPE_IDENTITY()

        INSERT INTO IF_Incidents
        (
            Folio, 
            Owner_Name,
            Owner_Address,
            Date_Created, 
            User_ID, 
            Description, 
            Incident_Type_ID, 
            Incident_Status,
            App_ID
        )
        VALUES 
        (
            @chvFolio, 
            @chvOwner_Name,
            @chvOwner_Address,
            @dtsDate_Created, 
            @intUser_ID, 
            @chvDescription ,
            @intIncident_Type_ID, 
            @intIncident_Status,
            @intApp_ID 
        )
        Select @intErrorCode = @@Error, @intID = SCOPE_IDENTITY()

        --Insert Complaint
        INSERT INTO IF_Complaints
        (
            Incident_ID, 
            Complainant_ID, 
            Description ,  
            User_ID, 
            Officer_Assigned_ID, 
            Complaint_Status_ID, 
            Date_Made,
            Email_Complainant
        )
        VALUES 
        (
            @intID, 
            Null, 
            @chvDescription + ' at ' + @chvOwner_Address, 
            1, 
            1, 
            1, 
            @dtsDate_Created ,
            @chvEmail
        )
        Select @intErrorCode = @@Error--, @intID = SCOPE_IDENTITY()
    End

    Return @intErrorCode

正如您在存储过程中看到的那样，intId 在插入后总是获得增量值，调用 SCOPE_IDENTITY()

现在我正尝试通过以下方式使用 Entity Framework 调用我的存储过程:

var bptRep = DependencyFactory.GetDependency<ICetRepository<IF_Insert_Incidents_Citizen>>();
var parameters = GetIfInsertIncidentsCitizenParamenters();
var res = bptRep.GetAllFromStoredProcedure(storedProcedure, parameters);

仓库使用这个类

//class with just the return value
public class IF_Insert_Incidents_Citizen
{
    public int? intID { get; set; }
}

这里我获取了存储过程的所有参数

 private IEnumerable<SqlParameter> GetIfInsertIncidentsCitizenParamenters()
 {
        // Create Parameters
        var parameters = new List<SqlParameter>();

        var param1 = CreateSqlParameter("@chvFolio", SqlDbType.NVarChar, ParameterDirection.Input, criteria["chvFolio"].Value, 50); 

        parameters.Add(param1);

          ....

        var paramX = CreateSqlParameter("@intIncident_Status", SqlDbType.Int, ParameterDirection.Input, 10);
        parameters.Add(paramX);

        var outparam = CreateSqlParameter("@intID", SqlDbType.Int, ParameterDirection.InputOutput, DBNull.Value);
        parameters.Add(outparam);
}

public IQueryable<TEntity>GetAllFromStoredProcedure(string storedProcedure, IEnumerable<SqlParameter> parameters)
{
    var result = Context.Database.SqlQuery<TEntity>(storedProcedure, parameters).AsQueryable();    
    return result;
}

我按照@GertArnold 建议的方法但仍然没有用，这是我的参数和代码

var returnCode = new SqlParameter("@ReturnCode", SqlDbType.Int);
returnCode.Direction = ParameterDirection.Output;

var sql = "exec IF_Insert_Incidents_Citizen @chvFolio, @chvOwner_Name, @chvOwner_Address, @dtsDate_Created, @intUser_ID, @chvDescription, @chvEmail, @intIncident_Type_ID, @intIncident_Status, @intID OUT";

var data = ctx.Database.SqlQuery<object>(sql, returnCode, parameters);

var result = data.FirstOrDefault();

Answer 1

最后@GertArnold 给我指明了正确的方向，如果你还没有读过这篇文章，请读一读，这会节省你很多时间 Stored procedures with output parameters using SqlQuery in the DbContext API

我只是在 exec 调用中将 OUT 添加到我的 @intId 中，无需创建 ReturnCode 变量并调用 exec @ReturnCode = ....

var returnCode = new SqlParameter("@ReturnCode", SqlDbType.Int);
returnCode.Direction = ParameterDirection.Output;

我的代码最终看起来像这样，请注意在参数上调用 .ToArray 方法，而不是传递 IEnumerable 或 IList 的集合> 方法

var sql = "exec IF_Insert_Incidents_Citizen @chvFolio, @chvOwner_Name, @chvOwner_Address, @dtsDate_Created, @intUser_ID, @chvDescription, @chvEmail, @intIncident_Type_ID, @intIncident_Status, @intID OUT";

var data = ctx.Database.SqlQuery<object>(sql, returnCode, parameters.ToArray());

var result = data.FirstOrDefault();