C# 错误必须用表值参数声明标量变量

我不明白我在这里做错了什么。从更新段中，我得到以下错误：

必须声明标量变量“@OrderTestTVP”

这是我的表值参数类型

CREATE TYPE [dbo].[TVP_OrderTest] AS TABLE(
    [OrderTestId] [int] NULL,
    [OrderId] [int] NOT NULL,
    [TestCode] [varchar](10) NOT NULL
    )
GO

ALTER PROCEDURE [dbo].[TVP_Save_OrderTest]
    @OrderTestTVP TVP_OrderTest READONLY
AS
BEGIN
    BEGIN TRY
        DECLARE @TableOfIdentities TABLE (IdentValue BIGINT, TestCode varchar(10) )
        INSERT INTO OrderTest
                (
                    OrderId
                    ,TestCode
                ) 
                OUTPUT Inserted.OrderTestId,inserted.TestCode 
                INTO @TableOfIdentities(IdentValue,TestCode)
                   SELECT  OrderId
                    ,TestCode
            FROM @OrderTestTVP
            WHERE OrdertestID = 0

        UPDATE 
                OrderTest
                SET   
                    OrderId = @OrderTestTVP.OrderId,
                    TestCode = @OrderTestTVP.TestCode
                    FROM OrderTest INNER JOIN @OrderTestTVP
                  ON OrderTest.OrderTestId = @OrderTestTVP.OrderTestId

        SELECT * FROM @TableOfIdentities
    END TRY
    BEGIN CATCH
        exec error_catch
    END CATCH
END

---

我认为您必须为联接操作使用表别名：

UPDATE 
 OrderTest
 SET   
     OrderId = o.OrderId,
     TestCode = o.TestCode
 FROM OrderTest INNER JOIN @OrderTestTVP o
     ON OrderTest.OrderTestId = o.OrderTestId

---

我手头没有SQL可供尝试，但如果我没记错的话，表变量在表达式中使用时需要别名。

@OrderTestTVP TVP_OrderTest READONLY缺少类型声明-对吗？我将该类型创建类型[dbo].[TVP_OrderTest]作为表（）。事实上，当我只保留“插入”段时，它不会抛出任何错误