如何从本地存储的文件中读取JSON？

Question

我试图使用JSON.Net加载本地存储在ASP.Net MVC 4站点上的JSON文件,但是我无法指向该文件.这是我想要做的:

List<Treatment> treatments = JsonConvert.DeserializeObject<List<Treatment>>(Server.MapPath("~/Content/treatments.json"));

并且我遇到了这个错误:

An exception of type 'Newtonsoft.Json.JsonReaderException' occurred in Newtonsoft.Json.dll but was not handled in user code

Additional information: Unexpected character encountered while parsing value: c. Path '', line 0, position 0.

我应该做些什么呢？

Answer 1

您需要首先使用a读取JSON FileStream.

试试这个.

using(StreamReader sr = new StreamReader(Server.MapPath("~/Content/treatments.json")))
{
      treatments = JsonConvert.DeserializeObject<List<Treatment>>(sr.ReadToEnd());
}

Answer 2

您将路径和文件名作为JSON有效负载传递.您需要打开文件(例如FileStream)并将内容读入变量(例如StreamReader),并将文件内容作为有效负载传递给解串器.