在wpf中将控件绑定到对象的属性时, 当对象的属性发生改变时必须通知控件作出相应的改变, 所以此对象需要实现 INotifyPropertyChanged 接口
例1: (注意:从 .Net 4.5 才开始支持此特性)
//实现属性变更通知接口 INotifyPropertyChanged
public class TestA : INotifyPropertyChanged
{
public long ID { get; set; }
private string name;
public string Name
{
get
{
return this.name;
}
set
{
if (value != this.name)
{
this.name = value;
//调用属性变更通知方法
NotifyPropertyChanged();
}
}
}
// INotifyPropertyChanged 接口成员
public event PropertyChangedEventHandler PropertyChanged;
//此方法在每个属性的set中调用
//在可选参数propertyName上应用CallerMemberName特性
//调用此方法时,调用方的信息将替换为可选参数的参数,即在set中调用此方法,propertyName="当前属性的名称"
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
例2:(.net 4.0)
//实现属性变更通知接口 INotifyPropertyChanged
public class TestA : INotifyPropertyChanged
{
public long ID { get; set; }
private string name;
public string Name
{
get
{
return this.name;
}
set
{
if (value != this.name)
{
this.name = value;
//调用属性变更通知方法,参数为"属性名称"
NotifyPropertyChanged("Name");
}
}
}
// INotifyPropertyChanged 接口成员
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
}
转载于:https://www.cnblogs.com/gmcn/p/5882026.html