本文实例为大家分享了C#属性改变引发事件示例的具体代码，供大家参考，具体内容如下
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication15
{
class Program
{
static void Main( string [] args)
{
Monitor m = new Monitor();
m.PropertyChanging += new Monitor.EventHandler(m_PropertyChanging);
m.Year = 2014;
m.Year = 1890;
m.Year = 2013;
}
static bool First= false ;
static void m_PropertyChanging( object sender, PropertyChangingEventArgs e)
{
if (First== false )
{
First = true ;
}
else
{
if (e.NewValue < 1900 || e.NewValue > 3000)
e.Cancel = true ;
}
}
}
//（属性正在改变的时候）事件数据
class PropertyChangingEventArgs : EventArgs
{
//构造函数
public PropertyChangingEventArgs( string PropertyName, int OldValue, int NewValue)
{
_PropertyName = PropertyName;
_OldValue = OldValue;
_NewValue = NewValue;
}
//存储数据
private string _PropertyName;
private int _OldValue;
private int _NewValue;
private bool _Cancel;
//获取或设置属性
public string PropertyName
{
set
{
_PropertyName = value;
}
get
{
return _PropertyName;
}
}
public int OldValue
{
set
{
_OldValue = value;
}
get
{
return _OldValue;
}
}
public int NewValue
{
set
{
_NewValue = value;
}
get
{
return _NewValue;
}
}
public bool Cancel
{
set
{
_Cancel = value;
}
get
{
return _Cancel;
}
}
}
class Monitor
{
//定义委托
public delegate void EventHandler( object sender, PropertyChangingEventArgs e);
//定义事件
public event EventHandler PropertyChanging;
//事件处理（用属性方法）
int _YearValue;
public int Year
{
get
{
return _YearValue;
}
set
{
if (_YearValue != value)
{
if (PropertyChanging != null )
{
PropertyChangingEventArgs e = new PropertyChangingEventArgs( "Year" , _YearValue, value);
PropertyChanging( this , e);
if (e.Cancel)
{
return ;
}
else
{
_YearValue = value;
}
}
}
}
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
dy("nrwz");
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