how to create setter and getter Properties for nullable datetime. for example:
private DateTime mTimeStamp;
public DateTime TimeStamp
{
get { return mTimeStamp; }
set { mTimeStamp = value; }
}
Does nullable attributes support setter and getter or have i to declare it public?
private DateTime? mTimeStamp;
public DateTime TimeStamp
{
}
You can just do this instead:
public DateTime? TimeStamp { get; set; }
If you were having trouble with the compiler it's probably because you only changed one of the associated parts - either the private
member variable or the property's data type. They need to match, of course, and auto-properties handles that for you nicely.
EDIT Just to further clarify, DateTime?
is not merely decorated with an ?
attribute - it's entirely different from DateTime
. DateTime?
is shorthand for Nullable<DateTime>
, which is a generic ( Nullable<T>
) that provides nullable support to non-reference types by wrapping the generic parameter T
, which is a struct
.
您可以使用与普通DateTime
属性相同的方式创建属性:
public DateTime? TimeStamp { get; set; }
You should be able to make a DateTime nullable in this way:
private DateTime? mTimeStamp;
public DateTime? TimeStamp
{
get { return mTimeStamp; }
set { mTimeStamp = value; }
}
You can use this modifier on other types as well. Read up here: http://msdn.microsoft.com/en-us/library/1t3y8s4s%28v=VS.100%29.aspx
A nullable DateTime is a discrete type from a regular DateTime and can be used like any other type. So your code would be:
private DateTime? mTimeStamp;
public DateTime? TimeStamp
{
get { return mTimeStamp; }
set { mTimeStamp = value; }
}
It's the same as non-nullable:
public DateTime? TimeStamp { get; set; }
You can replace DateTime
with DateTime?
in your top sample code (looks like code is missing at the bottom of your post).
private DateTime? mTimeStamp;
public DateTime? TimeStamp
{
get { return mTimeStamp; }
set { mTimeStamp = value; }
}
or, if you are using .net 3.0+
public DateTime? TimeStamp {get;set;}
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