C# 如何定义自定义属性相对应的事件?

Question

假设自定义控件（UserControl）有一自定义属性 PatientName,
那么在用户修改 PatientName 的内容时将触发 B 事件，B事件在控件中将如何定义？
谢谢!!　　

Answer 1

 public delegate void PatientNameEvent();
        public event PatientNameEvent PatientNameChanged;        private object m_PatientName;        public object PatientName
        {
            get { return m_PatientName; }
            set
            {
                if (PatientNameChanged != null) PatientNameChanged();
                m_PatientName = value;
            }
        }

Answer 2

public object PatientName
        {
            get { return m_PatientName; }
            set
            {
                if(m_PatientName!=value)
                    OnPatientNameChanged();
                m_PatientName = value;
            }
        }protect viture void OnPatientNameChanged()
{
if (PatientNameChanged != null) 
PatientNameChanged();
}

Answer 3

一楼的做法完全正确
我这里抛砖引玉给一段完善的示例，这是我们编程的经典代码：    public class MyClass
    {
        public event EventHandler<PropertyChagedEventArgs> MyPropertyChanging;
        public event EventHandler<PropertyChagedEventArgs> MyPropertyChanged;        private int _myProperty;
        public int MyProperty
        {
            get { return _myProperty; }
            set
            {
                if (value != _myProperty)
                {
                    PropertyChagedEventArgs e = new PropertyChagedEventArgs("MyProperty", _myProperty, value);
                    if (this.MyPropertyChanging != null)
                    {
                        this.MyPropertyChanging(this, e);
                        if (e.Cancel) return;
                    }
                    _myProperty = (int)e.NewValue;
                    if (this.MyPropertyChanged != null)
                    {
                        this.MyPropertyChanged(this, e);
                    }
                }
            }
        }
    }    /// <summary>
    /// 通用的类
    /// </summary>
    public class PropertyChagedEventArgs : EventArgs
    {
        public PropertyChagedEventArgs(string propertyName,object oldValue,object newValue)
        {
            PropertyName = propertyName;
            OldValue = oldValue;
            NewValue = newValue;
        }        public bool Cancel { get; set; }
        public string PropertyName { get; private set; }
        public object OldValue { get; private set; }
        public object NewValue { get; set; }
    }

Answer 4

kldxdybb，Error_Code写的真不错，困惑N久的问题，看后明白，多谢多谢！