winform处理{ "msg": "success", "code": 0, "data": [ { "entName": "江苏快达农化股份有限公司总部", "type": "废水", "pointName": "快达（二期）", "monitorName": "流量", "monitorData": 0, "unit": "L/S", "monitorTime": "2023-05-31 21:13:10" }, { "entName": "江苏快达农化股份有限公司总部", "type": "废水", "pointName": "快达（二期）", "monitorName": "pH值", "monitorData": 8.05, "unit": null, "monitorTime": "2023-05-31 21:13:10" }, { "entName": "江苏快达农化股份有限公司总部", "type": "废水", "pointName": "快达（二期）", "monitorName": "COD", "monitorData": 195.4, "unit": "mg/L", "monitorTime": "2023-05-31 21:13:10" } ] }并找到"type":"废水"且"pointName":"快达（二期）"且"monitorName":"COD"的"monitorData"的值并输出

可以通过以下代码实现：

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Threading.Tasks;

namespace WinFormDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private async void button1_Click(object sender, EventArgs e)
        {
            // 构造请求参数
            string url = "http://example.com/api/data";
            var parameters = new Dictionary<string, string>
            {
                { "key", "value" }
            };

            // 发送 HTTP 请求
            using (var client = new HttpClient())
            {
                var response = await client.PostAsync(url, new FormUrlEncodedContent(parameters));
                if (response.IsSuccessStatusCode)
                {
                    // 解析响应数据
                    var json = await response.Content.ReadAsStringAsync();
                    var result = JsonConvert.DeserializeObject<ApiResponse>(json);

                    // 遍历结果，找到符合条件的数据
                    foreach (var item in result.Data)
                    {
                        if (item.Type == "废水" && item.PointName == "快达（二期）" && item.MonitorName == "COD")
                        {
                            Console.WriteLine(item.MonitorData);
                        }
                    }
                }
            }
        }
    }

    public class ApiResponse
    {
        public string Msg { get; set; }
        public int Code { get; set; }
        public List<DataItem> Data { get; set; }
    }

    public class DataItem
    {
        public string EntName { get; set; }
        public string Type { get; set; }
        public string PointName { get; set; }
        public string MonitorName { get; set; }
        public double MonitorData { get; set; }
        public string Unit { get; set; }
        public string MonitorTime { get; set; }
    }
}

其中，ApiResponse 类和 DataItem 类用于解析响应数据。在 button1_Click 方法中，首先构造了一个 POST 请求，然后发送 HTTP 请求并解析响应数据。最后遍历结果，找到符合条件的数据并输出。