我编写了一个实用程序类，用于解析查询字符串和表单数据。可在以下网址获得：
https://gist.github.com/peteroupc/5619864
示例：

// Example query string from the question
String test="Property1=A&Property2=B&Property3%5B0%5D%5BSubProperty1%5D=a&Property3%5B0%5D%5BSubProperty2%5D=b&Property3%5B1%5D%5BSubProperty1%5D=c&Property3%5B1%5D%5BSubProperty2%5D=d";
// Convert the query string to a JSON-friendly dictionary
var o=QueryStringHelper.QueryStringToDict(test);
// Convert the dictionary to a JSON string using the JSON.NET
// library <http://json.codeplex.com/>
var json=JsonConvert.SerializeObject(o);
// Output the JSON string to the console
Console.WriteLine(json);

告诉我你是否适合。

.NET Framework 4.5包含将url编码的表单数据转换为JSON所需的一切。为此，您必须在C#项目中添加对命名空间System.Web.Extension的引用。之后，您可以使用JavaScriptSerializer类，它为您提供了进行转换所需的一切。

密码

using System.Web;
using System.Web.Script.Serialization;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var dict = HttpUtility.ParseQueryString("Property1=A&Property2=B&Property3%5B0%5D%5BSubProperty1%5D=a&Property3%5B0%5D%5BSubProperty2%5D=b&Property3%5B1%5D%5BSubProperty1%5D=c&Property3%5B1%5D%5BSubProperty2%5D=d");
            var json = new JavaScriptSerializer().Serialize(
                                                     dict.Keys.Cast<string>()
                                                         .ToDictionary(k => k, k => dict[k]));

            Console.WriteLine(json);
            Console.ReadLine();
        }
    }
}

输出

{
    "Property1":"A",
    "Property2":"B",
    "Property3[0][SubProperty1]":"a",
    "Property3[0][SubProperty2]":"b",
    "Property3[1][SubProperty1]":"c",
    "Property3[1][SubProperty2]":"d"
}

• 注意：输出不包含换行符或任何格式 *
• 来源：How do I convert a querystring to a json string?*

如果你使用的是ASP.NET Core 1.0+和JSON.NET，你可以这样做：

var reader = new Microsoft.AspNetCore.WebUtilities.FormReader(httpRequest.Body, Encoding.UTF8);
Dictionary<string, StringValues> keyValuePairs = await reader.ReadFormAsync();
var json = JsonConvert.SerializeObject(keyValuePairs);