Silverlight不写实体类也能显示数据呵呵
开篇
在任何的BS项目的开发中，怎么把后台的数据展示到前端，都是无法避免的甚至有时候让人头疼的问题。考虑到这点，Silverlight中微软给予了我们Binding这一伟大的特性。借助他，让我们可以用非常优雅的方式处理数据的展示.....。我们知道，Binding是沟通Xaml和数据源的桥梁，而大部分时候，我们的数据源都是一个实体类实例或者实体类实例集合。故在我们潜意识里，要展示一份数据，几乎必须写实体类不可。本文的目的就是使用一种‘巧妙的方式’，让我们不写实体类也可以Bingding.....从而显示数据。
准备
我们的目的非常简单，写一个方法，传入字符串的JSON数据，让DataGrid显示数据。Json数据如下。特别注意该JSON格式。JSON数据如下。
View Code
[ { "PersonAidsID": "ff9619ff-8b46-d011-b42d-00c04fc934f1", "IDNum": "594832934875849485", "Sex": "1", "RecordTime": "2012/2/28 10:29:34", "Address": "合额度126号", "Name": "陈-冠-希是你", "Age": "34", "GeographicLocation": "43.887594849178,81.3012265555597", "IllnessNarratives": "2", "得病类型": "", "民族": "", "吸毒史": "", "VillageID": "ff9619ff-8b46-d011-b42d-00c04fc934f6" }, { "PersonAidsID": "ff9619ff-8b46-d011-b42d-00c04fc934f1", "IDNum": "594832934875849485", "Sex": "1", "RecordTime": "2012/2/28 10:29:34", "Address": "合额度126号", "Name": "陈-冠-希是你", "Age": "34", "GeographicLocation": "43.887594849178,81.3012265555597", "IllnessNarratives": "2", "得病类型": "", "民族": "", "吸毒史": "", "VillageID": "ff9619ff-8b46-d011-b42d-00c04fc934f6" }, { "PersonAidsID": "ff9619ff-8b46-d011-b42d-00c04fc934f1", "IDNum": "594832934875849485", "Sex": "1", "RecordTime": "2012/2/28 10:29:34", "Address": "合额度126号", "Name": "陈-冠-希是你", "Age": "34", "GeographicLocation": "43.887594849178,81.3012265555597", "IllnessNarratives": "2", "得病类型": "", "民族": "", "吸毒史": "", "VillageID": "ff9619ff-8b46-d011-b42d-00c04fc934f6" }, { "PersonAidsID": "ff9619ff-8b46-d011-b42d-00c04fc934f1", "IDNum": "594832934875849485", "Sex": "1", "RecordTime": "2012/2/28 10:29:34", "Address": "合额度126号", "Name": "陈-冠-希是你", "Age": "34", "GeographicLocation": "43.887594849178,81.3012265555597", "IllnessNarratives": "2", "得病类型": "", "民族": "", "吸毒史": "", "VillageID": "ff9619ff-8b46-d011-b42d-00c04fc934f6" }, { "PersonAidsID": "ff9619ff-8b46-d011-b42d-00c04fc934f1", "IDNum": "594832934875849485", "Sex": "1", "RecordTime": "2012/2/28 10:29:34", "Address": "合额度126号", "Name": "陈-冠-希是你", "Age": "34", "GeographicLocation": "43.887594849178,81.3012265555597", "IllnessNarratives": "2", "得病类型": "", "民族": "", "吸毒史": "", "VillageID": "ff9619ff-8b46-d011-b42d-00c04fc934f6" }, { "PersonAidsID": "ff9619ff-8b46-d011-b42d-00c04fc934f1", "IDNum": "594832934875849485", "Sex": "1", "RecordTime": "2012/2/28 10:29:34", "Address": "合额度126号", "Name": "陈-冠-希是你", "Age": "34", "GeographicLocation": "43.887594849178,81.3012265555597", "IllnessNarratives": "2", "得病类型": "", "民族": "", "吸毒史": "", "VillageID": "ff9619ff-8b46-d011-b42d-00c04fc934f6" }, { "PersonAidsID": "ff9619ff-8b46-d011-b42d-00c04fc934f1", "IDNum": "594832934875849485", "Sex": "1", "RecordTime": "2012/2/28 10:29:34", "Address": "合额度126号", "Name": "陈-冠-希是你", "Age": "34", "GeographicLocation": "43.887594849178,81.3012265555597", "IllnessNarratives": "2", "得病类型": "", "民族": "", "吸毒史": "", "VillageID": "ff9619ff-8b46-d011-b42d-00c04fc934f6" }, { "PersonAidsID": "ff9619ff-8b46-d011-b42d-00c04fc934f1", "IDNum": "594832934875849485", "Sex": "1", "RecordTime": "2012/2/28 10:29:34", "Address": "合额度126号", "Name": "陈-冠-希是你", "Age": "34", "GeographicLocation": "43.887594849178,81.3012265555597", "IllnessNarratives": "2", "得病类型": "", "民族": "", "吸毒史": "", "VillageID": "ff9619ff-8b46-d011-b42d-00c04fc934f6" }, { "PersonAidsID": "ff9619ff-8b46-d011-b42d-00c04fc934f1", "IDNum": "594832934875849485", "Sex": "1", "RecordTime": "2012/2/28 10:29:34", "Address": "合额度126号", "Name": "陈-冠-希是你", "Age": "34", "GeographicLocation": "43.887594849178,81.3012265555597", "IllnessNarratives": "2", "得病类型": "", "民族": "", "吸毒史": "", "VillageID": "ff9619ff-8b46-d011-b42d-00c04fc934f6" } ]
服务端：
特别注意我的服务端..... 就是一个ASPX的页面。然后使用Response.Write 的方法向客户端输送数据。个人觉得这种方式简单又灵活。比起WCF。
最后的服务端如下
客户端取得数据：
string dataUrl = HtmlPage.Document.DocumentUri.AbsoluteUri.Replace("Default.aspx", "Handler/Data.aspx");
WebClient webClient = new WebClient();
webClient.DownloadStringAsync(new Uri(dataUrl));
webClient.DownloadStringCompleted += (sender1, e1) =>
{
MessageBox.Show(e1.Result);
};
呵呵这写法非常常见。 但值得各位注意的是：
string dataUrl = HtmlPage.Document.DocumentUri.AbsoluteUri.Replace("Default.aspx", "Handler/Data.aspx");
这个写法。这样的话，不管换哪个IP，都不会有问题。
反射实体类来咯
上面客户端已经可以取得数据了。接下来要做的就是怎么把JSON转换为实体类实例集合。
有三步工作要做。
1：从JSON中获得列头。（见代码中GetCoumsByJson 方法）
2：从列头反射形成实体类。（见代码中getTypeByStrList方法）
3：反序列化形成实体类集合。
下面直接上代码。怎么做的。看代码便知。
https://files.cnblogs.com/MySilverlight/SilverlightApplication2.zip
诸位看看代码便知。注意跑起来之后浏览首页要点击一下那个按钮才显示数据哦
会影响性能吗？
基本不会。因为即便是使用反射形成实体类。但请注意，这里是使用的Emit的方式。这种反射方式不咋影响性能....。
后话：这算做是我框架介绍的开篇.... 呵呵 一共五偏 呵呵
