如何在 C# 中字符串格式化复杂的 Json 正文

Question

i have the following code

var UUID = "ExampleX";
var NumID = "ExampleY";
var Payload = string.Format("{\"API1\":{\"API2\":\"API3\",\"API4\":5},\"API6\":\"{0}\",\"API7\":\"{1}\",\"API8\":\"API8\"}",UUID,NumID);

i'm trying to replace the input for {0} and {1} with UUID and NumID but i kept getting the following Error

Input string was not in a correct format.

i'm still learning how to code any help is appreciated

Answer 1

You could parse the Json String as JObject and then replace the API6 and API7 values. For example,

var json = "{\"API1\":{\"API2\":\"API3\",\"API4\":5},\"API6\":\"{0}\",\"API7\":\"{1}\",\"API8\":\"API8\"}";
var jo = JObject.Parse(json);
jo["API6"] = UUID;
jo["API7"] = NumID;
var Payload = jo.ToString();

Output

{
  "API1": {
    "API2": "API3",
    "API4": 5
  },
  "API6": "ExampleX",
  "API7": "ExampleY",
  "API8": "API8"
}

Answer 2

你必须用双括号转义 json 括号，这样它们就不会被解释为占位符：

var Payload = string.Format("{{\"API1\":{{\"API2\":\"API3\",\"API4\":5}},\"API6\":\"{0}\",\"API7\":\"{1}\",\"API8\":\"API8\"}}",UUID,NumID);