为什么Newtonsoft.Json不能反序列化字典列表

Question

nvlst在此处声明，然后填充

Dictionary<string, string> nvlst = new Dictionary<string, string>();

服务完成后，返回

JsonConvert.SerializeObject(nvlst, Formatting.Indented)

当客户端尝试反序列化时，会抛出错误

alst = JsonConvert.DeserializeObject<Dictionary<string, string>>(sb.ToString());

这是错误信息：

Error converting value "{
  "Status": "SUCCESS:",
  "CustomerId": "1",
  "LicenseKey": "03bad945-37c0-4fa0-8126-fb4935df396d",
  "MachineFingerPrint": "9B82-A8ED-3DE9-0D8C-26DD-2D83-C17F-C2E3",
  "ExpirationDate": "11/18/2014",
  "LicenseDate": "11/18/2013",
  "LicenseGraceDay": "7",
  "RequireRenewal": "Y",
  "BaseUrl": "http://www.xxx-xxxxxxx.com",
  "HelpUrl": "http://www.xxx-xxxxxxx.com/help",
  "APIUrl": "http://localhost:63583/api/Ajax/runGenericMethodFromApp",
  "CoName": "TestCustomer1",
  "Addr1": "123 Any Street",
  "Addr2": "",
  "City": "Louisville",
  "State": "KY",
  "Zip": "40245"
}" to type 'System.Collections.Generic.Dictionary`2[System.String,System.String]'. Path '', line 1, position 704.

sb.ToString（）的实际值低于

""{\r\n  \"Status\": \"SUCCESS:\",\r\n  \"CustomerId\": \"1\",\r\n  \"LicenseKey\": \"03bad945-37c0-4fa0-8126-fb4935df396d\",\r\n  \"MachineFingerPrint\": \"9B82-A8ED-3DE9-0D8C-26DD-2D83-C17F-C2E3\",\r\n  \"ExpirationDate\": \"11/18/2014\",\r\n  \"LicenseDate\": \"11/18/2013\",\r\n  \"LicenseGraceDay\": \"7\",\r\n  \"RequireRenewal\": \"Y\",\r\n  \"BaseUrl\": \"http://www.xxx-xxxxxxx.com\",\r\n  \"HelpUrl\": \"http://www.xxx-xxxxxxx.com/help\",\r\n  \"APIUrl\": \"http://localhost:63583/api/Ajax/runGenericMethodFromApp\",\r\n  \"CoName\": \"TestCustomer1\",\r\n  \"Addr1\": \"123 Any Street\",\r\n  \"Addr2\": \"\",\r\n  \"City\": \"Louisville\",\r\n  \"State\": \"KY\",\r\n  \"Zip\": \"40245\"\r\n}""

Answer 1

看起来你的字符串被双重序列化了，所以这就是为什么它没有正确地反序列化。如果您使用的是WebAPI这样的框架，它会为您处理序列化，因此您不需要调用JsonConvert.SerializeObject()。相反，更改ApiController方法以直接返回对象（注意，您还需要更改方法签名）。例如：

public class FooController : ApiController
{
    [HttpPost]
    public Dictionary<string, string> runGenericMethodFromApp()
    {
        Dictionary<string, string> dict = new Dictionary<string, string>();
        dict.Add("Status", "SUCCESS,");
        dict.Add("CustomerId", "1");
        dict.Add("LicenseKey", "03bad945-37c0-4fa0-8126-fb4935df396d");
        dict.Add("MachineFingerPrint", "9B82-A8ED-3DE9-0D8C-26DD-2D83-C17F-C2E3");
        dict.Add("ExpirationDate", "11/18/2014");
        dict.Add("LicenseDate", "11/18/2013");
        dict.Add("LicenseGraceDay", "7");
        dict.Add("RequireRenewal", "Y");
        dict.Add("BaseUrl", "http://www.xxx-xxxxxxx.com");
        dict.Add("HelpUrl", "http://www.xxx-xxxxxxx.com/help");
        dict.Add("APIUrl", "http://localhost:63583/api/Ajax/runGenericMethodFromApp");
        dict.Add("CoName", "TestCustomer1");
        dict.Add("Addr1", "123 Any Street");
        dict.Add("Addr2", "");
        dict.Add("City", "Louisville");
        dict.Add("State", "KY");
        dict.Add("Zip", "40245");
        return dict;
    }
}