Windows Phone：如何检查WMAppManifest中的Capability属性

在Windows Phone应用中有一个应用程序清单（WMAppManifest.xml），其中对于不同的应用可以设定Capability来告知需要哪些特性或功能，详细内容可以参考官方文档： http://msdn.microsoft.com/zh-CN/library/windowsphone/develop/jj206936(v=vs.105).aspx

比如说，开发一个不需要麦克风的应用，就不需要ID_CAP_MICROPHONE标记，一般来说也都清理得差不多，但又有时候需要检查，比如我们在写一个触发震动的操作类库时候碰巧需要判定ID_CAP_SENSORS时该怎么办呢，微软没有提供相应的检查接口，所以只好自己来解决。

下面是针对于WP7的检查，WP8上也通用，只不过需要检查WP8自己特殊Capability，需要自己加一些代码。

/// <summary>
/// For Windows Phone 7
/// </summary>
static class CapabilityHelper
{
    private const string WMAppManifest = "WMAppManifest.xml";
    private const string ID_CAP_CONTACTS = "ID_CAP_CONTACTS";  
    private const string ID_CAP_NETWORKING = "ID_CAP_NETWORKING";  
    private const string ID_CAP_IDENTITY_DEVICE = "ID_CAP_IDENTITY_DEVICE";  
    private const string ID_CAP_IDENTITY_USER = "ID_CAP_IDENTITY_USER";  
    private const string ID_CAP_LOCATION = "ID_CAP_LOCATION";  
    private const string ID_CAP_SENSORS = "ID_CAP_SENSORS";  
    private const string ID_CAP_MICROPHONE = "ID_CAP_MICROPHONE";  
    private const string ID_CAP_MEDIALIB = "ID_CAP_MEDIALIB";  
    private const string ID_CAP_GAMERSERVICES = "ID_CAP_GAMERSERVICES";  
    private const string ID_CAP_PHONEDIALER = "ID_CAP_PHONEDIALER";  
    private const string ID_CAP_PUSH_NOTIFICATION = "ID_CAP_PUSH_NOTIFICATION";  
    private const string ID_CAP_WEBBROWSERCOMPONENT = "ID_CAP_WEBBROWSERCOMPONENT";  
    private const string CAPABILITIES = "Capabilities";  
    private const string NAME = "Name";  
  
    static CapabilityHelper()  
    {
        try
        {
            Check();
        }catch(Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
    }
    static void Check()
    {

        using (var xmlreader = XmlReader.Create(WMAppManifest))
        {
            while (xmlreader.Read())
            {
                switch (xmlreader.NodeType)
                {
                    case XmlNodeType.Element:
                        if (xmlreader.Name == "Capability")
                        {
                            var value = xmlreader.GetAttribute(NAME);
                            switch (value)
                            {
                                case ID_CAP_NETWORKING:
                                    IsNetworkingCapability = true;
                                    break;
                                case ID_CAP_IDENTITY_DEVICE:
                                    IsDeviceIdentityCapability = true;
                                    break;
                                case ID_CAP_IDENTITY_USER:
                                    IsUserIdentityCapability = true;
                                    break;
                                case ID_CAP_LOCATION:
                                    IsLocationCapability = true;
                                    break;
                                case ID_CAP_SENSORS:
                                    IsSensorsCapability = true;
                                    break;
                                case ID_CAP_MICROPHONE:
                                    IsMicrophoneCapability = true;
                                    break;
                                case ID_CAP_MEDIALIB:
                                    IsMediaLibCapability = true;
                                    break;
                                case ID_CAP_GAMERSERVICES:
                                    IsGamerServicesCapability = true;
                                    break;
                                case ID_CAP_PHONEDIALER:
                                    IsPhoneDialerCapability = true;
                                    break;
                                case ID_CAP_PUSH_NOTIFICATION:
                                    IsPushNotificationCapability = true;
                                    break;
                                case ID_CAP_WEBBROWSERCOMPONENT:
                                    IsWebBrowserComponentCapability = true;
                                    break;
                                case ID_CAP_CONTACTS:
                                    IsContactsCapability = true;
                                    break;
                                default:
                                    break;
                            }
                        }
                        break;
                    default:
                        break;
                }
            } 
        }  
    }
    public static bool IsNetworkingCapability { get;private set; }
    public static bool IsDeviceIdentityCapability { get; private set; }
    public static bool IsUserIdentityCapability { get; private set; }
    public static bool IsLocationCapability { get; private set; }
    public static bool IsSensorsCapability { get; private set; }
    public static bool IsMicrophoneCapability { get; private set; }
    public static bool IsMediaLibCapability { get; private set; }
    public static bool IsGamerServicesCapability { get; private set; }
    public static bool IsPhoneDialerCapability { get; private set; }
    public static bool IsPushNotificationCapability { get; private set; }
    public static bool IsWebBrowserComponentCapability { get; private set; }
    public static bool IsContactsCapability { get; private set; }
}

希望能够给一些朋友带来帮助。