添加分钟到日期不会改变日期 C# .NET
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Adding Minutes to Date is not changing the Date C# .NET
提问by
double TotalMinute=300.0 double TotalMinutesAdded=1378.0
double TotalMinute=300.0 double TotalMinutesAdded=1378.0
double TotalMinute=300.0
double TotalMinutesAdded=1378.0
foreach(DataRow dr in ds.Tables[0].Rows)
{
//Add The above Timings to each Row's 2nd Column
DateTime correctDate=Convert.ToDateTime(dr[2]);
correctDate.AddMinutes(TotalMinute);
correctDate.AddMinutes(TotalMinutesAdded);
dr[2]=correctDate;
}采纳答案by Garry Shutler
As mentioned, due to DateTimeobjects being immutable you have to reassign the variable.
如前所述，由于DateTime对象是不可变的，您必须重新分配变量。
However, a point to note is that you can chain the manipulations as so:
但是，需要注意的一点是，您可以像这样链接操作：
correctDate = correctDate.AddMinutes(TotalMinute)
.AddMinutes(TotalMinutesAdded);
回答by Janis Veinbergs
DateTiem Add* functions are not supposed to change current DateTime value. They RETURN the new Value.
DateTiem Add* 函数不应更改当前的 DateTime 值。他们返回新的价值。
If you want your value changed, type like this:
如果你想改变你的值，像这样输入：
correctDate = correctDate.AddMinutes(TotalMinute);
回答by Todd
You have to set the correctDate variable to instance returned from the AddMinutes call:
您必须将正确日期变量设置为从 AddMinutes 调用返回的实例：
correctDate = correctDate.AddMinutes(TotalMinute);
回答by Sebastian Dietz
AddMinutes() does not change the value of the original DateTime. It returns a new DateTime with the new value that you have to assign to a variable.
AddMinutes() 不会更改原始 DateTime 的值。它返回一个新的 DateTime，其中包含您必须分配给变量的新值。
回答by Marc Gravell
DateTime is immutable; functions like AddMinutes return a newDateTime; so you need to catch the returned value:
日期时间是不可变的；AddMinutes 等函数返回一个新的DateTime；所以你需要捕捉返回的值：
DateTime foo = ...
DateTime bar = foo.AddMinutes(5);
回答by efdee
DateTime is an immutable type, much like String is. You would write date = date.AddDays(1) like you would write str = str.Replace("hello", "").
DateTime 是一个不可变类型，很像 String 。您可以像编写 str = str.Replace("hello", "") 一样编写 date = date.AddDays(1)。
回答by NR.
The problem lies with
问题在于
correctDate.AddMinutes(TotalMinute);
correctDate.AddMinutes(TotalMinutesAdded);
it should be
它应该是
correctDate = correctDate.AddMinutes(TotalMinute);
correctDate = correctDate.AddMinutes(TotalMinutesAdded);
The AddMinutes method returns the result, not adding the minutes to correctDate
AddMinutes 方法返回结果，而不是将分钟添加到correctDate
回答by Kristian
...and to add say 5 minutes to the current time to a datetime variable:
...并将当前时间添加 5 分钟到日期时间变量：
dim dateFive_Minute_Time as datetime
dateFive_Minute_Time = Now.AddMinutes(5)
