将JSON文件从磁盘直接反序列化到对象

Question

I'm trying to deserialise a JSON file from local disk into an object. I've got the following, but this only seems to work when downloading it from the web:

var client = new HttpClient();
using (var s = await client.GetStreamAsync(filePath))
using (var sr = new StreamReader(s))
using (var jr = new JsonTextReader(sr))
{
    var js = new JsonSerializer();
    return js.Deserialize<MyObject>(jr);
}

I'm trying to find a way to do this, without first reading it into a string.

Answer 1

From Here
you can deserialize an object from file in two way.

Solution-1: Read file into a string and deserialize JSON to a type

string json = File.ReadAllText(@"c:\myObj.json");
MyObject myObj = JsonConvert.DeserializeObject<MyObject>(json);

Solution-2: Deserialize JSON directly from a file

using (StreamReader file = File.OpenText(@"c:\myObj.json"))
{
    JsonSerializer serializer = new JsonSerializer();
    MyObject myObj2 = (MyObject)serializer.Deserialize(file, typeof(MyObject));
}

You can download Newtonsoft.Json from NuGet by following command

Install-Package Newtonsoft.Json

Answer 2

using (var s = new StreamReader(filePath))
{
    using (var jr = new JsonTextReader(s))
    {
        var js = new JsonSerializer();
        var obj = js.Deserialize<MyObject>(jr);
        return obj;
    }
}

Answer 3

You might want to look at this : https://msdn.microsoft.com/en-us/library/bb412179(v=vs.110).aspx

It's an MSDN article called "How to: Serialize and Deserialize JSON Data"