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1. 定義與 JSON 結構匹配的 C# 模型類

假設客戶端發送的 JSON 結構如下：

{
  "user": {
    "name": "發到付的",
    "age": 30
  },
  "roles": ["admin", "editor"],
  "metadata": {
    "createdAt": "2023-10-01",
    "active": true
  }
}

對應的模型類定義：

public class PostRequestModel
{
    public User User { get; set; }
    public List<string> Roles { get; set; }
    public Metadata Metadata { get; set; }
}


public class User
{
    public string Name { get; set; }
    public int Age { get; set; }
}


public class Metadata
{
    public string CreatedAt { get; set; }
    public bool Active { get; set; }
}

2. 創建 Web API 控制器（支持 POST 方法）

在 App_Code 或項目根目錄中創建控制器（如 DataController.cs）：

using System.Web.Http;
using System.Net.Http;


public class DataController : ApiController
{
    [HttpPost] // 明確標記為 POST 方法
    public HttpResponseMessage PostData(PostRequestModel model)
    {
        if (model == null)
        {
            return Request.CreateResponse(
                System.Net.HttpStatusCode.BadRequest, 
                new { Error = "請求體為空" }
            );
        }


        // 處理數據（示例：返回接收到的數據）
        return Request.CreateResponse(
            System.Net.HttpStatusCode.OK, 
            new { 
                UserName = model.User.Name, 
                RoleCount = model.Roles.Count 
            }
        );
    }
}

客戶端發送 POST 請求

$.ajax({
    url: '/api/data', // 對應 DataController
    type: 'POST',
    contentType: 'application/json',
    data: JSON.stringify({
        user: { name: "發到飯否", age: 30 },
        roles: ["admin", "editor"],
        metadata: { createdAt: "2023-10-01", active: true }
    }),
    success: function(response) {
        console.log(response);
    }
});

完整代碼示例

DataController.cs

using System.Web.Http;
using System.Net.Http;
using System.Runtime.Serialization;


public class DataController : ApiController
{
    [HttpPost]
    public HttpResponseMessage PostData(PostRequestModel model)
    {
        if (model == null)
        {
            return Request.CreateResponse(
                System.Net.HttpStatusCode.BadRequest, 
                new { Error = "Invalid request body" }
            );
        }


        // 業務邏輯處理
        return Request.CreateResponse(
            System.Net.HttpStatusCode.OK, 
            new { 
                Message = $"Received: {model.User.Name}, Roles: {model.Roles.Count}"
            }
        );
    }
}


[DataContract]
public class PostRequestModel
{
    [DataMember]
    public User User { get; set; }


    [DataMember]
    public List<string> Roles { get; set; }


    [DataMember]
    public Metadata Metadata { get; set; }
}


[DataContract]
public class User
{
    [DataMember(Name = "name")]
    public string Name { get; set; }


    [DataMember(Name = "age")]
    public int Age { get; set; }
}


[DataContract]
public class Metadata
{
    [DataMember(Name = "createdAt")]
    public string CreatedAt { get; set; }


    [DataMember(Name = "active")]
    public bool Active { get; set; }
}