Silverlight中常用知识总结

public abstract class NotificationObject : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
 
    protected virtual void RaisePropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler handler = this.PropertyChanged;
        if (handler != null)
        {
            handler(this,new PropertyChangedEventArgs(propertyName));
        }
    }
 
    protected void RaisePropertyChanged(params string[] propertyNames)
    {
        if (propertyNames == null) throw new ArgumentNullException("propertyNames");
 
        foreach (var name in propertyNames)
        {
            this.RaisePropertyChanged(name);
        }
    }
 
   protected void RaisePropertyChanged<T>(Expression<Func<T>> propertyExpression)
    {
       var propertyName = ExtractPropertyName(propertyExpression);
        this.RaisePropertyChanged(propertyName);
    }
 
    public static string ExtractPropertyName<T>(Expression<Func<T>> propertyExpression)
   {
        if (propertyExpression == null)
        {
           throw new ArgumentNullException("propertyExpression");
        }
 
        var memberExpression = propertyExpression.Body as MemberExpression;
        if (memberExpression == null)
        {
            throw new ArgumentException("PropertySupport_NotMemberAccessExpression_Exception","propertyExpression");
        } 
        var property = memberExpression.Member as PropertyInfo;
        if (property == null)
       {
            throw new ArgumentException("PropertySupport_ExpressionNotProperty_Exception","propertyExpression");
        }

       var getmethod = property.Getgetmethod(true);
        if (getmethod.Isstatic)
       {
           throw new ArgumentException("PropertySupport_StaticExpression_Exception","propertyExpression");
        }
 
        return memberExpression.Member.Name;
    }
}

相应的，Student类型为：
public class Student : NotificationObject
{
    string firstName;
    public string FirstName
    {
       get
        {
           return firstName;
        }
        set
        {
            firstName = value;
            //Notify("FirstName");
            this.RaisePropertyChanged("FirstName");
        }
   }
   string lastName;
    public string LastName
    {
        get
       {
            return lastName;
        }
        set
        {
            lastName = value;
          //Notify("LastName");
            this.RaisePropertyChanged("LastName");
        }
    }
 
    public Student(string firstName,string lastName)
    {
        this.firstName = firstName;
        this.lastName = lastName;
    }
   
}

Windows Phone7获取当前网络状态

using Microsoft.Phone.Net.networkinformation;
...

        string netState,netName;
        private bool _networkIsAvailable;
        private NetworkInterfaceType _currentNetworkType; //网络连接的类型    
        private void GetNetInfo(object sender,RoutedEventArgs e)
        {
            _networkIsAvailable = NetworkInterface.GetIsNetworkAvailable();//当前网络是否可用
            _currentNetworkType = NetworkInterface.NetworkInterfaceType;//获取当前网络的类型

            if (_networkIsAvailable)
            {
                netState = "联网状态";
                //Message.Background = new SolidColorBrush(Colors.Green);
            }  
            else
            {
                netState = "断网状态";
                //Message.Background = new SolidColorBrush(Colors.Red);
            } 

            switch (_currentNetworkType)
            {
                case NetworkInterfaceType.MobilebroadbandCdma:
                    netName = "CDMA网络";
                    break;
                case NetworkInterfaceType.MobilebroadbandGsm:
                    netName = "CSM网络";
                    break;
                case NetworkInterfaceType.Wireless80211:
                    netName = "Wi-Fi网络";
                    break;
                case NetworkInterfaceType.Ethernet:
                    netName = "Ethernet网络";
                    break;
                case NetworkInterfaceType.None:
                    netName = "网络不可用";
                    break;
                default:
                    netName = "其他的网络";
                    break;
            }
        }
...