Question

我正在尝试将字符串转换为DateTime，以便可以将其插入Ms SQL数据库字段，即datetime数据类型。

public  DateTime ConvertCloseDate(string closeDate)
{
 return DateTime.ParseExact(closeDate,"YYYY-MM-DDThh:mm:ss",null);
}

这里closeDate保存的值类似于7/14/0016 5:00:00 AM我需要转换为Ms SQL Database将接受的日期时间格式。

使用上面的代码我收到错误

 String was not recognized as a valid DateTime.

 Exception type: FormatException
 Source: mscorlib
 Target Site: System.DateTime ParseExact(System.String, System.String, System.Globalization.DateTimeFormatInfo, System.Globalization.DateTimeStyles)
 The following is a stack trace that identifies the location where the exception occured

  at System.DateTimeParse.ParseExact(String s, String format, DateTimeFormatInfo dtfi, DateTimeStyles style)
  at System.Xml.Xsl.CompiledQuery.Script1.ConvertCloseDate(String closeDate)

Answer 1

The DateTime class has no format property to it. The second argument in DateTime.ParseExact is the format of the input.

I don't know enough about your input, but my best guess for the format would be M/DD/yyyy h:mm:ss tt

Once you have a DateTime object, you will be fine, SQL Server will accept it.

Answer 2

Try to use TryParse to see if it is a valid datetime and if it is MS SQL will accept closedDate string as is.

DateTime warrantyDate;
bool recDate = DateTime.TryParse(closedDate, out warrantyDate);
if(recDate)
{
    //if rec date is true, MS SQL will accept it as datetime
}

将String转换为DateTime格式时出错

2 个答案: