Program.cs

// See https://aka.ms/new-console-template for more information
Console.WriteLine("Hello, World!");

Console.WriteLine("{\"err\":\"success\", \"value\":\"C#之父: 安德斯·海尔斯伯格\"}");
Console.WriteLine("{\"err\":\"success\", \"value\":\"C:\\data\"}");
Console.WriteLine("{\"err\":\"success\", \"value\":\"\u0043\u0023\u4e4b\u7236\u003a\u0020\u5b89\u5fb7\u65af\u00b7\u6d77\u5c14\u65af\u4f2f\u683c\"}");
Console.WriteLine(@"
{
    ""err"": ""success"",
    ""value"": ""C#之父: 安德斯·海尔斯伯格""
}
");

var msg = "success";
var value = "C#之父: 安德斯·海尔斯伯格";
Console.WriteLine($"{{\"err\":\"{msg}\", \"value\":\"{value}\"}}");

Console.WriteLine($@"
{{
    ""err"": ""{msg}"",
    ""value"": ""{value}""
}}
");

Console.WriteLine($@"
{{
    ""err"": ""{msg}"",
    ""value"": ""{value}""
}}
");