[英]Exception:Failed to convert parameter value from a string to a datetime
我试图借助SQL Server过程和C#使用DateTimePicker
将日期插入数据库。 但是当我执行程序时显示以下异常:
System.FormatException:无法将参数值从字符串转换为DateTime。 ---> System.FormatException:该字符串未被识别为有效的DateTime。 从索引0开始有一个未知单词。
我无法解决此问题。
我的程序是:
create procedure [dbo].[LeaveProcedure]
(@EmployeeID nvarchar(20),
@EmployeeName nvarchar(50),
@LeaveType nvarchar(20),
@leaveCode nvarchar(20),
@Leavedate date,
@TotalLeave int,
@LeaveTaken int,
@Balance int,
@Reason varchar(500)
)
AS
DECLARE @Max INT, @id varchar(10)
IF NOT EXISTS(SELECT id FROM LeaveMaster)
BEGIN
SET @id = 'EL001'
INSERT INTO dbo.EmployeeLeave(LeaveID, EmployeeID, EmployeeName, LeaveType, leaveCode, Leavedate, TotalLeave, LeaveTaken, Balance, Reason)
VALUES(@id, @EmployeeID, @EmployeeName, @LeaveType, @leaveCode, @Leavedate, @TotalLeave, @LeaveTaken, @Balance, @Reason)
END
ELSE
BEGIN
SELECT @Max = CONVERT(INT, SUBSTRING(CONVERT(NVARCHAR(10),id), 3, 10))
FROM LeaveMaster
SET @id = 'EL' + RIGHT('00' + CONVERT(NVARCHAR(10), @Max + 1), 5)
INSERT INTO dbo.EmployeeLeave(LeaveID, EmployeeID, EmployeeName, LeaveType, leaveCode, Leavedate, TotalLeave, LeaveTaken, Balance, Reason)
VALUES(@id, @EmployeeID, @EmployeeName, @LeaveType, @leaveCode, @Leavedate, @TotalLeave, @LeaveTaken, @Balance, @Reason)
END
这也是我的C#代码,用于使用上述过程插入到表中:
SqlCommand Leave = new SqlCommand();
SqlParameter EmployeeID = new SqlParameter("@EmployeeID", SqlDbType.VarChar);
SqlParameter EmployeeName = new SqlParameter("@EmployeeName", SqlDbType.VarChar);
SqlParameter LeaveType = new SqlParameter("@LeaveType", SqlDbType.DateTime);
SqlParameter leaveCode = new SqlParameter("@leaveCode", SqlDbType.VarChar);
SqlParameter Leavedate = new SqlParameter("@Leavedate", SqlDbType.Date);
SqlParameter TotalLeave = new SqlParameter("@TotalLeave", SqlDbType.Int);
SqlParameter LeaveTaken = new SqlParameter("@LeaveTaken", SqlDbType.Int);
SqlParameter Balance = new SqlParameter("@Balance", SqlDbType.Int);
SqlParameter Reason= new SqlParameter("@Reason", SqlDbType.VarChar);
SqlParameter LeaveID = new SqlParameter("@LeaveID", SqlDbType.VarChar);
Leave.Parameters.Add(EmployeeID);
Leave.Parameters.Add(EmployeeName);
Leave.Parameters.Add(LeaveType);
Leave.Parameters.Add(leaveCode);
Leave.Parameters.Add(Leavedate);
Leave.Parameters.Add(TotalLeave);
Leave.Parameters.Add(Balance);
Leave.Parameters.Add(Reason);
EmployeeID.Value = label_leave_emp_id.Text;
EmployeeName.Value = label_leave_emp_name.Text;
LeaveType.Value = comboBox_leavetype.Text;
leaveCode.Value = s2.ToString();
SqlParameter Leavedate = new SqlParameter("@Leavedate", SqlDbType.Date);
SqlParameter TotalLeave = new SqlParameter("@TotalLeave", SqlDbType.Int);
SqlParameter LeaveTaken = new SqlParameter("@LeaveTaken", SqlDbType.Int);
SqlParameter Balance = new SqlParameter("@Balance", SqlDbType.Int);
SqlParameter Reason= new SqlParameter("@Reason", SqlDbType.VarChar);
SqlParameter LeaveID = new SqlParameter("@LeaveID", SqlDbType.VarChar);
Leave.Parameters.Add(LeaveID);
Leave.Parameters.Add(EmployeeID);
Leave.Parameters.Add(EmployeeName);
Leave.Parameters.Add(LeaveType);
Leave.Parameters.Add(leaveCode);
Leave.Parameters.Add(Leavedate);
Leave.Parameters.Add(LeaveTaken);
Leave.Parameters.Add(TotalLeave);
Leave.Parameters.Add(Balance);
Leave.Parameters.Add(Reason);
EmployeeID.Value = label_leave_emp_id.Text;
EmployeeName.Value =label_leave_emp_name.Text;
LeaveType.Value = comboBox_leavetype.Text;
leaveCode.Value = s2.ToString();
Leavedate.Value = dateTimePicker_leave_date.Value;
TotalLeave.Value = Convert.ToInt32(totalleave.ToString());
LeaveTaken.Value = leavetaken;
Balance.Value = totalleave - leavetaken;
SqlCommand ccc = new SqlCommand("select LeaveID from EmployeeLeave", con);
SqlDataReader r1 = ccc.ExecuteReader();
while (r1.Read())
{
s2 = r1["LeaveID"].ToString();
}
if (s2 == null)
LeaveID.Value = " ";
else if (s2 != null)
LeaveID.Value = s2.ToString();
r1.Close();
Reason.Value = textBox_leave_reason.Text;
Leave.Connection = con;
Leave.CommandText = "LeaveProcdure @EmployeeID, @EmployeeName, @LeaveType, @leaveCode, @Leavedate, @TotalLeave, @LeaveTaken, @Balance, @Reason";
Leave.ExecuteNonQuery();
请帮我......
您已将LeaveType
为DateTime
,但应将其设置为varchar
。
当您将值分配给此参数时,您将在分配string
同时将其类型指定为DateTime
从而引发exception
。
您的SP @LeaveTpye
期望为nvarchar
因此您应将其类型更改为varchar
SqlParameter LeaveType = new SqlParameter("@LeaveType", SqlDbType.DateTime);
它应该是
SqlParameter LeaveType = new SqlParameter("@LeaveType", SqlDbType.VarChar);
您需要解析此值dateTimePicker_leave_date.Value:
DateTime date = DateTime.Parse(dateTimePicker_leave_date.Value).
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.