.net调用存储过程三 (含输出参数)

ALTER PROCEDURE [dbo].[test]

@BookId int output,
@BookName varchar(50),
@Author varchar(50)
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO [book]
(
[BookName]
,[Author]
)
VALUES
(
@BookName
,@Author
)

set @BookId=@@IDENTITY;
if @@rowcount<>1
BEGIN
RETURN -1;
END

RETURN 0;

END

// 创建参数
SqlParameter[] parameters = {
new SqlParameter("@BookId", SqlDbType.Int,4) ,
new SqlParameter("@BookName", SqlDbType.VarChar,50) ,
new SqlParameter("@Author", SqlDbType.VarChar,50) ,
new SqlParameter("retval", SqlDbType.Int,4)
};
//设置参数类型
parameters[0].Direction = ParameterDirection.Output;       // 设置为输出参数
parameters[1].Value = "testName";
parameters[2].Value =“dsd”;
// 给输入参数赋值
parameters[3].Direction = ParameterDirection.ReturnValue;  // 设置为返回值

int a = SqlHelper.ExecuteNonQuery(SqlHelper.CONN_STRING_LC, CommandType.StoredProcedure, "test", parameters);

Label1.Text =  parameters[0].Value.ToString()+"---"+ parameters[3].Value.ToString();;