在存储过程中将varchar转换为日期时出错

Question

有了这个陈述，我可以执行得很好：

SELECT sum(Amount) As '350' FROM Withdrawal 
WHERE WholeSellerId = 'Someone' AND DateAdded = '02-04-2016' And ProductId = '1'

但是当我把它放在像这样的存储过程中时：

ALTER PROCEDURE [dbo].[GetWithJR]
@WholeSellerId varchar(50),
@ProductId varchar(30),
@StartDate date
AS
BEGIN
    SELECT sum(Amount) As '350' FROM Withdrawal 
WHERE WholeSellerId = @WholeSellerId AND DateAdded = Cast(@StartDate as date) And ProductId = @ProductId
END

并按原样执行：

exec [dbo].[GetWithJR] 'Someone', '02-04-2016', '1'

我收到此错误：

Msg 8114, Level 16, State 5, Procedure GetWithJR, Line 0
Error converting data type varchar to date.

我尝试使用Convert(date, @StartDate, 110)和

Cast(@StartDate as date)

你能告诉我有什么问题吗？感谢。