无法反序列化JSON文件

Question

I have one json file that I want to de serialise with newtonsoft json library.

Please help.

Json file

[{
        "2406_1": [{
                "GSTIN_Status": "Active",
                "GSTIN": "18AABCF2533P1ZE",
                "Unique_ID": "5",
                "State": "Assam",
                "Input_PAN": "AABCF2533P",
                "Processing_Status": "Success"
            },
            {
                "GSTIN_Status": "Active",
                "GSTIN": "03AABCF2533P1ZP",
                "Unique_ID": "5",
                "State": "Punjab",
                "Input_PAN": "AABCF2533P",
                "Processing_Status": "Success"
            },
            {
                "GSTIN_Status": "Active",
                "GSTIN": "06AABCF2533P1ZJ",
                "Unique_ID": "5",
                "State": "Haryana",
                "Input_PAN": "AABCF2533P",
                "Processing_Status": "Success"
            },
            {
                "GSTIN_Status": "Active",
                "GSTIN": "23AABCF2533P1ZN",
                "Unique_ID": "5",
                "State": "Madhya Pradesh",
                "Input_PAN": "AABCF2533P",
                "Processing_Status": "Success"
            },
            {
                "GSTIN_Status": "Active",
                "GSTIN": "27AABCF2533P1ZF",
                "Unique_ID": "5",
                "State": "Maharashtra",
                "Input_PAN": "AABCF2533P",
                "Processing_Status": "Success"
            },
            {
                "GSTIN_Status": "Active",
                "GSTIN": "07AABCF2533P1ZH",
                "Unique_ID": "5",
                "State": "Delhi",
                "Input_PAN": "AABCF2533P",
                "Processing_Status": "Success"
            },
            {
                "GSTIN_Status": "Active",
                "GSTIN": "08AABCF2533P1ZF",
                "Unique_ID": "5",
                "State": "Rajasthan",
                "Input_PAN": "AABCF2533P",
                "Processing_Status": "Success"
            }
        ]
    },
    {
        "2406_2": [{
            "GSTIN_Status": "Active",
            "GSTIN": "27AABCF2544E1ZZ",
            "Unique_ID": "11",
            "State": "Maharashtra",
            "Input_PAN": "AABCF2544E",
            "Processing_Status": "Success"
        }]
    },
    {
        "2406_83998": [{
            "GSTIN_Status": "Active",
            "GSTIN": "29AABCF2416M1ZJ",
            "Unique_ID": "83961",
            "State": "Karnataka",
            "Input_PAN": "AABCF2416M",
            "Processing_Status": "Success"
        }]
    }
]

Code

    public class RootObject
{
    public List<OutputList> OutputList { get; set; }

    public RootObject()
    { }

}
 public class OutputList
{
    public string GSTIN_Status { get; set; }
    public string GSTIN { get; set; }
    public string Unique_ID { get; set; }
    public string State { get; set; }
    public string Input_PAN { get; set; }
    public string Processing_Status { get; set; }


public OutputList()
{

}
}


OutputList Obj = new OutputList();

                string FileName = IDfileUpload.PostedFile.FileName;
                string path =Server.MapPath("~/InputFiles/"+FileName);
                string json = "";
                JavaScriptSerializer JavaScriptSerializer = new JavaScriptSerializer();
                using (StreamReader r = new StreamReader(path))
                {
                    json = r.ReadToEnd().Trim();
                }

                List<RootObject>instance = JsonConvert.DeserializeObject<List<RootObject>>(json);
                string GSTIN = instance[0].OutputList[0].GSTIN;

Answer 1

The elements are null because your JSON doesn't match the RootObject class structure you've defined.

Here's a skeleton of your JSON:

[ // An array
    { // An object
        "2406_1": // A name
        [         // A value (another array)
            { // Another object
                "GSTIN_Status": "Active", // More name-value pairs
                ...
            },
            ...
        ]
    },
    {
        "2406_2": [
            {
                "GSTIN_Status": "Active",
                ...
            }
        ]
    },
    {
        "2406_83998": [
            {
                "GSTIN_Status": "Active",
                ...
            }
        ]
    }
]

In short, your JSON is an array of objects , where an object consists of name-value pairs . In this case it looks like each of those objects consists of exactly one name-value pair, where the name appears to be a unique key of some sort and the value is an array of OutputList .

How do you represent something in C# that maps a unique string-based key to an array of OutputList ? Using Dictionary<string, OutputList[]> . Then, your entire JSON is just an array of those dictionaries:

var instance = JsonConvert.DeserializeObject<Dictionary<string, OutputList[]>[]>(json);

This gives me a properly deserialized object without any nulls. If it's not the structure you expected or wanted, then you'll need to either change the JSON, change your class structure, or transform the resulting array of dictionaries into eg just a single dictionary with multiple key-value pairs:

var transformed = instance.SelectMany(o => o)
                          .ToDictionary(kv => kv.Key, kv => kv.Value);