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HttpClient client = new HttpClient(); Uri uri = new Uri(url); HttpResponseMessage response = await client.GetAsync(uri); response.EnsureSuccessStatusCode(); string str = await response.Content.ReadAsStringAsync();
可以通过以下方法方便的转换到类中：
var jsonMessage = await response.Content.ReadAsStringAsync();
var serializer = new DataContractJsonSerializer(typeof(JsonClass));//在json2csharp中转换过来的类
var ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonMessage));
var result = (JsonClass)serializer.ReadObject(ms);
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原文地址：http://www.cnblogs.com/zhuyulong/p/5516035.html
