C# 改变属性值时触发事件

     改变属性值时触发事件

public class ValueChangeTest
    {
        public event EventHandler PropertyChanged;
        private string strValue;
        public string StrValue
        {
            set
            {
                this.strValue = value;
                OnPropertyChanged(new EventArgs());//每次改变Name值调用方法; 
            }
            get { return strValue; }
        }

        private void OnPropertyChanged(EventArgs eventArgs)
        {
            if (this.PropertyChanged != null)//判断事件是否有处理函数 
            {
                this.PropertyChanged(this, eventArgs);
            }

        }
    }

   应用

 ValueChangeTest cvt = new ValueChangeTest();
            cvt.PropertyChanged += new EventHandler(cvt_PropertyChanged);
            cvt.StrValue = "123";

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 void cvt_PropertyChanged(object sender, EventArgs e)
        {
            MessageBox.Show("123");
        }