C#回顾 - 8.利用反射动态创建对象
2024-10-19 21:23:56
拿微信消息返回的示例数据实验
- var data = "<xml><ToUserName><![CDATA[toUser]]></ToUserName><FromUserName><![CDATA[fromUser]]></FromUserName><CreateTime>1348831860</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[this is a test]]></Content><MsgId>1234567890123456</MsgId></xml>";
创建一个消息枚举
- /// <summary>
- /// 消息类型枚举
- /// </summary>
- public enum MsgType
- {
- /// <summary>
- /// 文本消息
- /// </summary>
- TEXT,
- /// <summary>
- /// 图片消息
- /// </summary>
- IMAGE,
- /// <summary>
- /// 语音消息
- /// </summary>
- VOICE,
- /// <summary>
- /// 视频消息
- /// </summary>
- VIDEO,
- /// <summary>
- /// 小视频消息
- /// </summary>
- SHORTVIDEO,
- /// <summary>
- /// 地理位置消息
- /// </summary>
- LOCATION,
- /// <summary>
- /// 链接消息
- /// </summary>
- LINK,
- /// <summary>
- /// 事件类型
- /// </summary>
- EVENT
- }
因为消息类型的大多数属性都相同,创建一个基类
- public abstract class BaseMsg
- {
- /// <summary>
- /// 开发者微信号
- /// </summary>
- public string ToUserName { get; set; }
- /// <summary>
- /// 发送方帐号(一个OpenID)
- /// </summary>
- public string FromUserName { get; set; }
- /// <summary>
- /// 消息创建时间 (整型)
- /// </summary>
- public string CreateTime { get; set; }
- /// <summary>
- /// 消息类型
- /// </summary>
- public MsgType MsgType { get; set; }
- }
再创建相应缺少类的属性
- /// <summary>
- /// 文本消息类型(例外)
- /// </summary>
- public class MsgText : BaseMsg
- {
- /// <summary>
- /// 文本消息内容
- /// </summary>
- public string Content { get; set; }
- /// <summary>
- /// 消息Id,64位整型
- /// </summary>
- public string MsgId { get; set; }
- }
- /// <summary>
- /// 图片消息类型(例外)
- /// </summary>
- public class MsgImage : BaseMsg
- {
- /// <summary>
- /// 图片链接
- /// </summary>
- public string PicUrl { get; set; }
- /// <summary>
- /// 消息Id,64位整型
- /// </summary>
- public string MsgId { get; set; }
- /// <summary>
- /// 图片消息媒体id,可以调用多媒体文件下载接口拉取数据。
- /// </summary>
- public string MediaId { get; set; }
- }
- /// <summary>
- /// 语音消息类型(例外)
- /// </summary>
- public class MsgVoice : BaseMsg
- {
- /// <summary>
- /// 语音消息媒体id,可以调用多媒体文件下载接口拉取数据。
- /// </summary>
- public string MediaId { get; set; }
- /// <summary>
- /// 语音格式,如amr,speex等
- /// </summary>
- public string Format { get; set; }
- /// <summary>
- /// 消息id,64位整型
- /// </summary>
- public string MsgID { get; set; }
- }
- /// <summary>
- /// 视频消息类型(例外)
- /// </summary>
- public class MsgVideo : BaseMsg
- {
- /// <summary>
- /// 视频消息媒体id,可以调用多媒体文件下载接口拉取数据
- /// </summary>
- public string MediaId { get; set; }
- /// <summary>
- /// 视频消息缩略图的媒体id,可以调用多媒体文件下载接口拉取数据。
- /// </summary>
- public string ThumbMediaId { get; set; }
- /// <summary>
- /// 消息id,64位整型
- /// </summary>
- public string MsgId { get; set; }
- }
- /// <summary>
- /// 小视频消息类型(例外)
- /// </summary>
- public class MsgShortVideo : BaseMsg
- {
- /// <summary>
- /// 视频消息媒体id,可以调用多媒体文件下载接口拉取数据
- /// </summary>
- public string MediaId { get; set; }
- /// <summary>
- /// 视频消息缩略图的媒体id,可以调用多媒体文件下载接口拉取数据。
- /// </summary>
- public string ThumbMediaId { get; set; }
- /// <summary>
- /// 消息id,64位整型
- /// </summary>
- public string MsgId { get; set; }
- }
- /// <summary>
- /// 地理位置消息类型(例外)
- /// </summary>
- public class MsgLocation : BaseMsg
- {
- /// <summary>
- /// 地理位置维度
- /// </summary>
- public string Location_X { get; set; }
- /// <summary>
- /// 地理位置经度
- /// </summary>
- public string Location_Y { get; set; }
- /// <summary>
- /// 地图缩放大小
- /// </summary>
- public string Scale { get; set; }
- /// <summary>
- /// 地理位置信息
- /// </summary>
- public string Label { get; set; }
- /// <summary>
- /// 消息id,64位整型
- /// </summary>
- public string MsgId { get; set; }
- }
- /// <summary>
- /// 链接消息类型(例外)
- /// </summary>
- public class MsgLink : BaseMsg
- {
- /// <summary>
- /// 消息标题
- /// </summary>
- public string Title { get; set; }
- /// <summary>
- /// 消息描述
- /// </summary>
- public string Description { get; set; }
- /// <summary>
- /// 消息链接
- /// </summary>
- public string Url { get; set; }
- /// <summary>
- /// 消息id,64位整型
- /// </summary>
- public string MsgId { get; set; }
- }
加载消息,转换成对象
- public static BaseMsg LoadMsg()
- {
- var data = "<xml><ToUserName><![CDATA[toUser]]></ToUserName><FromUserName><![CDATA[fromUser]]></FromUserName><CreateTime>1348831860</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[this is a test]]></Content><MsgId>1234567890123456</MsgId></xml>";
- var doc = XElement.Parse(data);
- MsgType msgtype = (MsgType)Enum.Parse(typeof(MsgType), doc.Element("MsgType").Value.ToUpper());
- //MsgType msgtype = (MsgType)Enum.Parse(typeof(MsgType), "TEXT");
- switch (msgtype)
- {
- case MsgType.IMAGE:
- return ConvertObj<MsgImage>(data);
- case MsgType.LINK:
- return ConvertObj<MsgLink>(data);
- case MsgType.LOCATION:
- return ConvertObj<MsgLocation>(data);
- case MsgType.VIDEO:
- return ConvertObj<MsgVideo>(data);
- case MsgType.SHORTVIDEO:
- return ConvertObj<MsgShortVideo>(data);
- case MsgType.TEXT:
- return ConvertObj<MsgText>(data);
- case MsgType.EVENT:
- return null;
- default:
- return ConvertObj<BaseMsg>(data);
- }
- }
利用反射
- public static T ConvertObj<T>(string xmlstr)
- {
- try
- {
- var xml = XElement.Parse(xmlstr);
- var type = typeof(T);
- var t = Activator.CreateInstance<T>(); //动态创建实例,相当于 new T()
- var tousername = type.GetProperty("ToUserName");//搜索具有指定名称的公共属性
- //PropertyInfo.SetValue(object obj, object value, object[] index)
- tousername.SetValue(t, Convert.ChangeType(xml.Element("ToUserName").Value, tousername.PropertyType), null);
- xml.Element("ToUserName").Remove();
- var fromusername = type.GetProperty("FromUserName");
- fromusername.SetValue(t,
- Convert.ChangeType(xml.Element("FromUserName").Value, fromusername.PropertyType), null);
- xml.Element("FromUserName").Remove();
- var createtime = type.GetProperty("CreateTime");
- createtime.SetValue(t, Convert.ChangeType(xml.Element("CreateTime").Value, createtime.PropertyType), null);
- xml.Element("CreateTime").Remove();
- var msgType = type.GetProperty("MsgType");
- var msgtype = xml.Element("MsgType").Value;
- //msgType.SetValue() 是枚举,参数要改变
- msgType.SetValue(t, (MsgType)Enum.Parse(typeof(MsgType), msgtype.ToUpper()), null);
- xml.Element("MsgType").Remove();
- foreach (var element in xml.Elements())
- {
- var pr = type.GetProperty(element.Name.ToString());
- pr.SetValue(t, Convert.ChangeType(element.Value, pr.PropertyType), null);
- }
- return t;
- }
- catch (Exception)
- {
- return default(T);
- throw;
- }
- }
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