qlhb/WindowsFormsApp1/Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using QRCoder;
using Core.RabbitMQBus.Common;
using Core.RabbitMQBus.EventBus;
using Core.RabbitMQBus.Extensions;
using Microsoft.Extensions.DependencyInjection;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //Run();
            RenderQrCode();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            //Console.WriteLine("Hello World!");
            //IServiceCollection services = new ServiceCollection();
            //services.AddLogging();
            //services.AddTransient<ILoggerFactory, LoggerFactory>();
            //services.AddTransient<ITestService, TestService>();
            //services.RegisterRabbitMQ(e => new RabbitMQOptions() { HostName = "124.71.132.255" }); //localhost
            //services.RabbitMQRegisterSubscriber("RabbitMQBusTest", "Service");
            ////构建容器
            //IServiceProvider serviceProvider = services.BuildServiceProvider();
            //// 创建ConsoleLogProvider并根据日志类目名称（CategoryName）生成Logger实例
            ////解析
            //_rabbitMqPublisher = serviceProvider.GetService<IRabbitMqPublisher>();
            //Publisher();
        }

        //public void Publisher()
        //{
        //    for (int i = 0; i < 10000; i++)   //100000
        //    {
        //        Console.WriteLine("PublishTestCount:" + i);
        //        _rabbitMqPublisher.Publish("PublishTest1", "测试" + i);
        //        _rabbitMqPublisher.Publish("PublishTest2", "测试" + i);
        //    }
        //}

        private void RenderQrCode()
        {
            string level = "Q";// comboBoxECC.SelectedItem.ToString();
            QRCodeGenerator.ECCLevel eccLevel = (QRCodeGenerator.ECCLevel)(level == "L" ? 0 : level == "M" ? 1 : level == "Q" ? 2 : 3);
            using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
            {
                using (QRCodeData qrCodeData = qrGenerator.CreateQrCode("9f3274ec-1481-4988-a3c8-698bbafbf14b", eccLevel))
                {
                    using (QRCode qrCode = new QRCode(qrCodeData))
                    {

                        pictureBoxQRCode.BackgroundImage = qrCode.GetGraphic(20, Color.Black, Color.White,
                            null, 50);

                        this.pictureBoxQRCode.Size = new System.Drawing.Size(pictureBoxQRCode.Width, pictureBoxQRCode.Height);
                        //Set the SizeMode to center the image.
                        this.pictureBoxQRCode.SizeMode = PictureBoxSizeMode.CenterImage;

                        pictureBoxQRCode.SizeMode = PictureBoxSizeMode.StretchImage;
                    }
                }
            }
        }
        //private Bitmap GetIconBitmap()
        //{
        //    Bitmap img = null;
        //    if (iconPath.Text.Length > 0)
        //    {
        //        try
        //        {
        //            img = new Bitmap(iconPath.Text);
        //        }
        //        catch (Exception)
        //        {
        //        }
        //    }
        //    return img;
        //}

        //Linq对集合的各种查询
        public static void Run()
        {
            List<Customers> customerlist = new List<Customers>();
            customerlist.Add(new Customers() { id = 1, Name = "Jack", Custom = "Mis" });
            customerlist.Add(new Customers() { id = 2, Name = "Lus", Custom = "Google" });
            customerlist.Add(new Customers() { id = 3, Name = "Qiao", Custom = "Baidu" });
            customerlist.Add(new Customers() { id = 4, Name = "Qiao", Custom = "Apple" });
            customerlist.Add(new Customers() { id = 5, Name = "Adb", Custom = "Adobe" });

            //简单的查询
            var customerQuery = from query in customerlist
                                select query;

            //带where筛选
            var customerWhereQuery = from query in customerlist
                                     where query.id == 1 && query.Name == "Lus"
                                     select query;

            //排序Ordering
            var customerOrderingQuery = from query in customerlist
                                        where query.Name == "Lus"
                                        orderby query.id ascending
                                        select query;

            //分组Group by
            var customerGroupbyQuery = from query in customerlist
                                       group query by query.Name;
            //可以使用into进一步查询
            var customerGroupbyIntoQuery = from query in customerlist
                                           group query by query.Name into queryGroup
                                           where queryGroup.Key == "Qiao"
                                           select queryGroup;

            foreach (IGrouping<string, Customers> group in customerlist.GroupBy(c => c.Name))
            {

                Customers model = new Customers();
                model.Name = group.Key;
                foreach (Customers stu in group.OrderBy(a => a.Name))
                {
                    Console.Write(stu.Name + ";");
                }
                var customerList = group.OrderBy(a => a.Name).ToList();
            }

            //联接查询 join 子句始终针对对象集合而非直接针对数据库表运行。
            List<Customers> customerJoinlist = new List<Customers>();
            customerJoinlist.Add(new Customers() { id = 1, Name = "Jack", Custom = "Mis" });
            customerJoinlist.Add(new Customers() { id = 2, Name = "Lus", Custom = "Google" });
            customerJoinlist.Add(new Customers() { id = 3, Name = "Qiao", Custom = "Baidu" });
            var customerJoinQuery = from query1 in customerlist
                                    join query2 in customerJoinlist
                                    on query1.id equals query2.id
                                    select new { CustomerName = query1.Name, CustomerName2 = query2.Name };

            //数据源的类型参数始终为查询中的范围变量的类型。
            //比如List<Customers> 类型为Customers 在循环迭代的时候类型必须可以隐式转换为Customer 有一种情况是
            //这种情况下Customers类型转换为了String ..在select query.Name已经将查询目标类型定位了String类型
            var customerTypeQuery = from query in customerlist
                                    where query.Name == "Lus"
                                    select query.Name;

            //结合Lamdba对List集合筛选(s => s.Name == "Qiao")
            List<Customers> listString = customerlist.Where(s => s.Name == "Qiao").ToList();


        }
    }

}

public class Customers
{
    public int id { get; set; }

    public string Name { get; set; }

    public string Custom { get; set; }
}
public interface ITestService
{

}