在 C# 中只返回来自 json HttpContext.Response 的键

Question

I have a HttpContext.Response function which returns this json response:

{
    "[2-1] STORE[STORE_NBR]": 5026,
    "[2-1] STORE[STATE_PROV_CD]": "AR"        
}

Now, I just want the Keys to be returned and not the value as:

{
    [2-1] STORE[STORE_NBR],
    [2-1] STORE[STATE_PROV_CD]      
}

I tried commenting [1] and [2] but that result in an exception as value is expected. How can this outcome be achieved?

Answer 1

The Json response (as noted in a comment) can be easily deserialized to a Dictionary where both the Key and the Value of the KeyValuePair are strings. Here is how you could do that:

using System.Linq;
using Newtonsoft.Json; // Can be installed as a NuGet package

then

var dictionary = 
    JsonConvert.DeserializeObject<Dictionary<string,string>>(source);

Once you have the dictionary object, you can use Linq to extract just the Keys that you want and turn them into a list.

List<string> keys =
    dictionary.Select(keyValuePair => keyValuePair.Key).ToList();

where

const string source =
@"{
   ""[2 - 1] STORE[STORE_NBR]"": 5026,
   ""[2-1] STORE[STATE_PROV_CD]"": ""AR""        
  }";

These lines of code format the output you specified:

Console.WriteLine(
    "Here are the keys:");
Console.WriteLine(
    $"{{{Environment.NewLine}{string.Join("," + Environment.NewLine, keys)}{Environment.NewLine}}}");