c#中 把这个字符串值：{"Param":{"Change_id":"befa641c0d2445c391f856ba55f419c0","Station_code_Physical":"P-PAL1-001","Ot":2}} 赋值给httppost接口参数

在C#中，如果你想要将JSON字符串`{"Param":{"Change_id":"befa641c0d2445c391f856ba55f419c0","Station_code_Physical":"P-PAL1-001","Ot":2}}`赋值给HTTP POST接口的参数，通常会使用`System.Net.Http`库中的`HttpClient`或者`RestSharp`这样的第三方库。这里我会展示两种常见方法：

**方法一：使用HttpClient (基础版)**

using System;
using System.Net.Http;
using Newtonsoft.Json;

public class MyClass // 假设这是JSON中"Param"的对应类
{
    public string Change_id { get; set; }
    public string Station_code_Physical { get; set; }
    public int Ot { get; set; }
}

public async Task PostJsonData()
{
    string jsonString = @"{"Param":{"Change_id":"befa641c0d2445c391f856ba55f419c0","Station_code_Physical":"P-PAL1-001","Ot":2}}";
    MyClass obj = JsonConvert.DeserializeObject<MyClass>(jsonString); // 解析JSON到对象

    HttpClient client = new HttpClient();
    var content = new StringContent(JsonConvert.SerializeObject(obj), Encoding.UTF8, "application/json");
    var response = await client.PostAsync("http://your-api-url", content); // 替换为实际API地址
}

**方法二：使用RestSharp**

using RestSharp;

public async Task PostJsonWithRestSharp()
{
    string jsonString = @"{"Param":{"Change_id":"befa641c0d2445c391f856ba55f419c0","Station_code_Physical":"P-PAL1-001","Ot":2}}";
    dynamic data = JsonConvert.DeserializeObject(jsonString); // 解析JSON到动态类型

    var client = new RestClient("http://your-api-url"); // 替换为实际API地址
    var request = new RestRequest(Method.POST);
    request.AddJsonBody(data); // 将数据添加为JSON内容
    var response = await client.ExecuteTaskAsync(request);
}