如何在DateTime类型的属性中设置空白作为默认值

本文关键字：空白设置默认值属性 DateTime 类型 | 更新日期: 2023-09-27 18:09:30

我已经创建了一个类型为DateTime的属性。当我在InvokePropertyChanged()事件的标签中设置此属性值时，它显示默认值(1/1/0001 12:00:00)。如果属性没有有效日期，我如何设置空白文本?

public event PropertyChangedEventHandler PropertyChanged;
private DateTime? _dDateTime = null;
public DateTime PostedDateTime
{
    get
    {
        return _dDateTime.HasValue ? _dDateTime.Value : DateTime.Now;
    }
    set
    {
        _dDateTime = value;
        InvokePropertyChanged(new PropertyChangedEventArgs("PostedDateTime"));
    }
}
public void InvokePropertyChanged(PropertyChangedEventArgs e)
{
    PropertyChangedEventHandler handler = PropertyChanged;
    if (handler != null)
    {
        handler(this, e);
        Refresh();
    }
    if (e.PropertyName.Equals("PostedDateTime"))
      lblDateTimeDt.Text = PostedDateTime.ToString();// setting datetime in label
}

您可以在分配

之前测试值

public void InvokePropertyChanged(PropertyChangedEventArgs e)
{
    PropertyChangedEventHandler handler = PropertyChanged;
    if (handler != null)
    {
       handler(this, e);
       Refresh();
    }
    if (e.PropertyName.Equals("PostedDateTime"))
    lblDateTimeDt.Text = PostedDateTime == DateTime.MinValue ? "" : PostedDateTime.ToString();

}