我已经为此苦苦挣扎了好几天,并通过 StackOverflow 和其他各种网站进行了广泛的挖掘。我真的是在画一个空白。我试图从我的存储过程中得到一个结果。
这是我的存储过程:
ALTER PROC [dbo].[myHelper_Simulate]
@CCOID nvarchar(100), @RVal nvarchar OUTPUT
AS
DECLARE @UserID int
DECLARE @GUID uniqueidentifier
SELECT @UserID = UserID
FROM [User]
WHERE CCOID = @CCOID AND deleted = 0
SELECT @GUID = newid()
IF @UserID > 0
BEGIN
INSERT [Audit] ([GUID], Created, UserID, ActionType, Action, Level)
VALUES (@GUID, getdate(), @UserID, 'Authentication', 'Test Authentication', 'Success')
SELECT @RVal = 'http://www.ttfakedomain.com/Logon.aspx?id=' + CAST(@GUID AS nvarchar(50))
RETURN
END
ELSE
SELECT @RVal = 'Couldn''t find a user record for the CCOID ' + @CCOID
RETURN
GO
最初编写程序是为了打印结果。我添加了@RVal
andRETURN
以尝试将值传递回我的 C# 代码。
这是我的 C# 例程(svrConn
已经连接到数据库):
private void btnSimulate_MouseClick(object sender, MouseEventArgs e)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = svrConn;
object result = new object();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "[" + tDatabase + "].[dbo].myHelper_Simulate";
cmd.Parameters.Add(new SqlParameter("@CCOID", txtDUserCCOID.Text.Trim()));
cmd.Parameters.Add(new SqlParameter("@RVal", ""));
cmd.Parameters.Add(new SqlParameter("RETURN_VALUE", SqlDbType.NVarChar)).Direction = ParameterDirection.ReturnValue;
try
{
result = cmd.ExecuteScalar();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
if (result != null)
{
tString = result.ToString();
MessageBox.Show(tString);
}
}
问题是result
返回null。我不确定这是由于存储过程还是我如何设置参数和调用ExecuteScalar
.