asp.net中的datetime属性和字段 [英] datetime properties and fields in asp.net

问题描述

DateTime _hiredate;
        public DateTime? hiredate
        {
            get
            {
                return _hiredate;
            }
            set
            {
                _hiredate = value;
            }
        }

<br />
Error    1    Cannot implicitly convert type ''System.DateTime?'' to ''System.DateTime''. An explicit conversion exists (are you missing a cast?)    E:\aspnet\comp\Business Object\company.cs    64    29    Business Object

我遇到转换问题，请帮助我

thanq.

i am getting conversion problem please help me

thanq.

推荐答案

，您需要将_hiredate声明为可为空的日期时间，或者在getter中进行强制转换，并在setter中使用HasValue Value

我建议您将_hiredate字段用作可为空的DateTime，例如

you need to either declare _hiredate as a nullable datetime or cast in the getter and use HasValue Value in the setter

I suggest you just the _hiredate field as a nullable DateTime, e.g.

DateTime? _hiredate;

因为您指定了属性为可空值:

Because you have specified that your property is nullable:

public DateTime? hiredate

编译器期望可为null的类型-DateTime不是.在设置值之前先进行投射:

the compiler expects a nullable type - which DateTime isn''t. Cast it before you set the value:

public DateTime? hiredate
{
    get
    {
        return _hiredate;
    }
    set
    {
        _hiredate = (DateTime) value;
    }
}

或更妙的是，使您的媒体资源字段可为空.甚至更好，请使用自动属性.

Or better, make your property base field nullable. Or even better, use an automatic property.

public DateTime? hiredate { get; set; }

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