来自 EF 映射对象的不兼容数据读取器异常 [英] Incompatible Data Reader Exception From EF Mapped Objects

问题描述

我正在使用实体框架并更新了一个表及其存储过程，但在调用存储过程时出现以下错误.

I am using Entity Framework and have updated a table and its stored procedure but I'm getting the following error when the stored procedure is called.

数据读取器与指定的不兼容'FormValueModel.Valuation'.'ValuationId' 类型的成员执行数据读取器中没有对应的同名列.

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

ValuationId 是我想要自动递增的主键.

ValuationId is my primary key witch i want to auto increment.

我可以执行从 SQL 管理工作室找到的存储过程，当我运行我的应用程序时，它会写入数据库，但随后出现错误消息.

I can execute the stored procedure find from SQL management studio, And when i run my application it writes into the database but then the error message appears.

我不熟悉实体框架，只有基础知识，我认为这可能是 model.edmx 的映射问题.

I'm unfamiliar with Entity Framework and just have the basics, and i think it may be a mapping issue from the model.edmx.

重新创建和映射模型中的表和存储过程的正确过程是什么?

What would be the correct procedure in recreating and mapping the tables and stored procedures in the model?

存储过程.

    ALTER PROCEDURE [dbo].[ValuationCreate]
    @TrackingNumber varchar(100),
    @FormMobiValuationId varchar(100),
    @ValuationPropertyId int,
    @ValuationFileName varchar(50)

AS   

SET NOCOUNT ON
SET XACT_ABORT ON


DECLARE @ErrorMessage varchar(1000)



BEGIN TRANSACTION


    --Insert to Valuation
    INSERT INTO [Valuation]
    (
        TrackingNumber,
        FormMobiValuationId,
        ValuationPropertyId, -- new
        ValuationFileName,
        Date,
        ValuationStatus,
        IsActive
    )
    VALUES
    (
        @TrackingNumber,
        @FormMobiValuationId,
        @ValuationPropertyId,--new
        @ValuationFileName,
        GETDATE(),
        1, --Created
        1
    )





IF @@ERROR > 0
BEGIN
    SET @ErrorMessage = 'Valuation Insert failed'
    GOTO ErrorHandler
END
ELSE
BEGIN
    COMMIT TRANSACTION
    RETURN
END



ErrorHandler:

RAISERROR(@ErrorMessage,16,1);
ROLLBACK TRANSACTION
RETURN -1

<小时>

发生错误的C#调用，错误信息出现在最后一行.

---

C# call where error occurs, The error message appears on the last line.

 public ObjectResult<Valuation> ValuationCreate(global::System.String trackingNumber, global::System.String formMobiValuationId, Nullable<global::System.Int32> valuationPropertyId, global::System.String valuationFileName)
        {
            ObjectParameter trackingNumberParameter;
            if (trackingNumber != null)
            {
                trackingNumberParameter = new ObjectParameter("TrackingNumber", trackingNumber);
            }
            else
            {
                trackingNumberParameter = new ObjectParameter("TrackingNumber", typeof(global::System.String));
            }

            ObjectParameter formMobiValuationIdParameter;
            if (formMobiValuationId != null)
            {
                formMobiValuationIdParameter = new ObjectParameter("FormMobiValuationId", formMobiValuationId);
            }
            else
            {
                formMobiValuationIdParameter = new ObjectParameter("FormMobiValuationId", typeof(global::System.String));
            }

            ObjectParameter valuationPropertyIdParameter;
            if (valuationPropertyId.HasValue)
            {
                valuationPropertyIdParameter = new ObjectParameter("ValuationPropertyId", valuationPropertyId);
            }
            else
            {
                valuationPropertyIdParameter = new ObjectParameter("ValuationPropertyId", typeof(global::System.Int32));
            }

            ObjectParameter valuationFileNameParameter;
            if (valuationFileName != null)
            {
                valuationFileNameParameter = new ObjectParameter("ValuationFileName", valuationFileName);
            }
            else
            {
                valuationFileNameParameter = new ObjectParameter("ValuationFileName", typeof(global::System.String));
            }

            return base.ExecuteFunction<Valuation>("ValuationCreate", trackingNumberParameter, formMobiValuationIdParameter, valuationPropertyIdParameter, valuationFileNameParameter);
        }

推荐答案

该消息表示存储过程的结果不包含名为 ValudationId 的列.仔细检查您的 select 语句并在 SSMS 中运行它以确保您带回该列.

The message means that the results of the stored procedure do not contain a column named ValudationId. Double check your select statement and run it in SSMS to ensure that you're bringing back that column.

您的过程不包含 select 语句.您需要选择插入的标识值(例如，使用 scope_identity() 函数)，以便 EF 可以将其映射回实体.

Your procedure does not contain a select statement. You need to select the inserted identity value (using the scope_identity() function, for example) so that EF can map it back to the entity.

例如

insert into Table
(
    Col1,
    Col2
)
values
(
    1,
    2
)

select scope_identity() as IdentityColName

另外，顺便说一句，您不需要插入语句中的所有事务；你只有一个修改数据的语句(你的插入).

Also, as an aside, you don't need all that transaction business in your insert statement; you only have one statement (your insert) that's modifying data.

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