应该说是 .net4 的bug,没有所谓的 System.Web.Extensions.dll 库文件,需要将项目的 Target Framework修改为 3.5版本,才能加载System.Web.Extensions.dll库文件.

我在使用 System.Web.Script.Serialization.JavaScriptSerializer 类解析嵌套的json时)用到.

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