C# 默認大寫, 而大部分的前端默認小寫, 這時候可以如此配置:

builder.Services.AddControllers().AddJsonOptions((opt) =>
{opt.JsonSerializerOptions.PropertyNamingPolicy = System.Text.Json.JsonNamingPolicy.CamelCase;opt.JsonSerializerOptions.WriteIndented = true;
});

JsonNamingPolicy 還有諸多配置方案. 下面介紹一些更加定制化的功能, 用控制臺程序舉例:

using JsonTest;
using System.ComponentModel;
using System.Text.Json;
using System.Text.Json.Serialization;List<Teacher> teachers = new();
for (int i = 0; i < 5; i++)
{teachers.Add(new(){Id = i + 1,FullName = $"FullName{i}"});
}Student student = new()
{Id = 1,FullName = "James",Description = "AAA",workDays = WorkDays.Monday| WorkDays.Tuesday,Teachers = teachers,Date = DateTime.Now
};JsonSerializerOptions options = new()
{WriteIndented = true,PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
};
var a = JsonSerializer.Serialize<Student>(student, options);Console.WriteLine(a);class Student
{//定制化, TableId的首字母不會應用CamelCase[JsonPropertyName("TableId")]public int Id { get; set; }public string FullName { get; set; } = string.Empty;/// <summary>/// 序列化時忽略/// </summary>[JsonIgnore]public string Description { get; set; } = string.Empty;public DateTime Date { get; set; }[JsonConverter(typeof(JsonStringEnumConverter))]public WorkDays workDays { get; set; }public List<Teacher> Teachers { get; set; } = new();
}class Teacher
{public int Id { get; set; }public string FullName { get; set; } = string.Empty;
}[Flags]enum WorkDays{Monday = 1,Tuesday = 2,Wednesday = 4,Thursday = 8,Friday = 16,Saturday = 32,Sunday =64}

結果: