示例：

Question

我的应用程序的Release文件夹中有一个settings.json文件。我想要做的是改变它的值，而不是暂时的，永久地改变它。这意味着，删除旧条目，写一个新条目并保存它。

以下是JSON文件的格式

{
"Admins":["234567"],
"ApiKey":"Text",
"mainLog": "syslog.log",
"UseSeparateProcesses": "false",
"AutoStartAllBots": "true",
"Bots": [
    {
        "Username":"BOT USERNAME",
        "Password":"BOT PASSWORD",
        "DisplayName":"TestBot",
        "Backpack":"",
        "ChatResponse":"Hi there bro",
        "logFile": "TestBot.log",
        "BotControlClass": "Text",
        "MaximumTradeTime":180,
        "MaximumActionGap":30,
        "DisplayNamePrefix":"[AutomatedBot] ",
        "TradePollingInterval":800,
        "LogLevel":"Success",
        "AutoStart": "true"
    }
]
}

假设我想更改密码值而不是BOT PASSWORD我希望它只是密码。我该怎么做？

Answer 1

这是一个简单的＆amp;廉价的方法（假设.NET 4.0及以上版本）：

string json = File.ReadAllText("settings.json");
dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject(json);
jsonObj["Bots"][0]["Password"] = "new password";
string output = Newtonsoft.Json.JsonConvert.SerializeObject(jsonObj, Newtonsoft.Json.Formatting.Indented);
File.WriteAllText("settings.json", output);

使用dynamic可以非常简单地直接索引到json对象和数组。但是，您确实会失去编译时检查。对于快速和肮脏的它是非常好的，但对于生产代码，你可能想要完全充实的类，根据@ gitesh.tyagi的解决方案。

Answer 2

您必须有类将json值实例化为：

public class Bot
    {
        public string Username { get; set; }
        public string Password { get; set; }
        public string DisplayName { get; set; }
        public string Backpack { get; set; }
        public string ChatResponse { get; set; }
        public string logFile { get; set; }
        public string BotControlClass { get; set; }
        public int MaximumTradeTime { get; set; }
        public int MaximumActionGap { get; set; }
        public string DisplayNamePrefix { get; set; }
        public int TradePollingInterval { get; set; }
        public string LogLevel { get; set; }
        public string AutoStart { get; set; }
    }



   public class RootObject
    {
        public List<string> Admins { get; set; }
        public string ApiKey { get; set; }
        public string mainLog { get; set; }
        public string UseSeparateProcesses { get; set; }
        public string AutoStartAllBots { get; set; }
        public List<Bot> Bots { get; set; }
    }

回答你的问题（未经测试的代码）：

//Read file to string
string json = File.ReadAllText("PATH TO settings.json");

//Deserialize from file to object:
JsonConvert.PopulateObject(json, RootObject);

//Change Value
RootObject.Bots[0].Password = "password";

// serialize JSON directly to a file again
using (StreamWriter file = File.CreateText(@"PATH TO settings.json"))
{
    JsonSerializer serializer = new JsonSerializer();
   serializer.Serialize(file, RootObject);
}

Answer 3

使用JObject中的Newtonsoft.Json.Linq类在不提前知道JSON结构的情况下进行操作：

using Newtonsoft.Json.Linq;

string jsonString = File.ReadAllText("myfile.json");
JObject jObject = Newtonsoft.Json.JsonConvert.DeserializeObject(jsonString) as JObject;
// Select a nested property using a single string:
JToken jToken = jObject.SelectToken("Bots[0].Password"); 
jToken.Replace("password");
string updatedJsonString = jObject.ToString();
File.WriteAllText("myfile.json", updatedJsonString);

示例：

// This is the JSON from the question
string jsonString = "{\"Admins\":[\"234567\"],\"ApiKey\":\"Text\",\"mainLog\":\"syslog.log\",\"UseSeparateProcesses\":\"false\",\"AutoStartAllBots\":\"true\",\"Bots\":[{\"Username\":\"BOT USERNAME\",\"Password\":\"BOT PASSWORD\",\"DisplayName\":\"TestBot\",\"Backpack\":\"\",\"ChatResponse\":\"Hi there bro\",\"logFile\":\"TestBot.log\",\"BotControlClass\":\"Text\",\"MaximumTradeTime\":180,\"MaximumActionGap\":30,\"DisplayNamePrefix\":\"[AutomatedBot] \",\"TradePollingInterval\":800,\"LogLevel\":\"Success\",\"AutoStart\":\"true\"}]}";

JObject jObject = Newtonsoft.Json.JsonConvert.DeserializeObject(jsonString) as JObject;

// Update a string value:
JToken jToken = jObject.SelectToken("Bots[0].Password");
jToken.Replace("password"); 

// Update an integer value:
JToken jToken2 = jObject.SelectToken("Bots[0].TradePollingInterval");
jToken2.Replace(555);

// Update a boolean value:
JToken jToken3 = jObject.SelectToken("Bots[0].AutoStart");
jToken3.Replace(false);

// Get an indented/formatted string:
string updatedJsonString = jObject.ToString(); 

//Output:
//{
//  "Admins": [
//    "234567"
//  ],
//  "ApiKey": "Text",
//  "mainLog": "syslog.log",
//  "UseSeparateProcesses": "false",
//  "AutoStartAllBots": "true",
//  "Bots": [
//    {
//      "Username": "BOT USERNAME",
//      "Password": "password",
//      "DisplayName": "TestBot",
//      "Backpack": "",
//      "ChatResponse": "Hi there bro",
//      "logFile": "TestBot.log",
//      "BotControlClass": "Text",
//      "MaximumTradeTime": 180,
//      "MaximumActionGap": 30,
//      "DisplayNamePrefix": "[AutomatedBot] ",
//      "TradePollingInterval": 555,
//      "LogLevel": "Success",
//      "AutoStart": false
//    }
//  ]
//}

Answer 4

我已经可以使用上面的信息使程序的2 / 3rds有效。我正在更新三个值。

.json格式代码段：

{ “版本”：“ 1.0.0”， “ SignBatches”：[ { “ SourceRootDirectory”：“ c：\ red”， “ DestinationRootDirectory”：“ d：\ green”， “ SignRequestFiles”：[ { “ SourceLocation”：“ billboard-GS_PariahHeart-v1.lzp” } ]

有效的代码：

jsonObj [“ SignBatches”] [0] [“ SourceRootDirectory”] = Path.GetDirectoryName（args [0]）;

jsonObj [“ SignBatches”] [0] [“ DestinationRootDirectory”] = Path.GetDirectoryName（args [1]）;

代码失败：

jsonObj [“ SignRequestFiles”] [0] [“ SourceLocation”] = Path.GetFileName（args [0]）;

请注意，这试图更新.json文件中嵌套对象的值。前两行正在更新相似的值，但它们在顶层。

生成的错误是：

未处理的异常。 Microsoft.CSharp.RuntimeBinder.RuntimeBinderException：无法对空引用执行运行时绑定

更改JSON文件中的值（写入文件）

4 个答案:

示例：