为什么方法中的代码执行两次？

Question

CustomerRepository.GetCustomers()方法内的代码执行两次。为什么会这样呢？在图片中，我展示了在方法内部执行代码的步骤。

描述。该代码进入步骤“ 5”。在步骤“ 5”之后，代码转到步骤“ 6”。在步骤“ 11”之后，调试器根据代码继续工作。

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图片1

图片2

图片3

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Program.cs

using System.Threading.Tasks;

namespace ConsoleAppCore
{
    class Program
    {   
        static async Task Main(string[] args) // ++ 
        {
            // await TestMain();

            Test1 test1 = new Test1();
            await test1.TestMain();
        }       
    }
}

Test1.cs

using System.Threading.Tasks;

// 
using NUnit.Framework;
using Microsoft.VisualStudio.TestTools.UnitTesting;

//
using ConsoleApp;
using ConsoleApp.Model;
using DBRepository.Interfaces;
using DBRepository.Repositories;
using DBRepository.Factories;

namespace ConsoleAppCore
{
    // NUnit тестирование 
    // пишем классы с атрибутом [TestFixture] 
    // пишем методы с атрибутом [Test] 
    [TestFixture]
    public class Test1
    {
        public Test1()
        {
            TestMain();
        }

        public Task TestMain()
        {            
            return GetCustomersTest_1();
        }       

        /// <summary>
        /// ____
        /// </summary>
        [TestMethod]
        public async Task GetCustomersTest_1()
        {
            SettingsService settingsService = new SettingsService();
            Settings settings = new Settings();

            // Получить строку подключения
            settings = settingsService.ReadFilfeT();
            string connectionString = settings.ConnectionString;

            IRepositoryContextFactory _iRepositoryContextFactory = new RepositoryContextFactory();
            ICustomerRepository _iCustomerRepository = new CustomerRepository(connectionString, _iRepositoryContextFactory);

            var customerList = await _iCustomerRepository.GetCustomers();
            string strTest = "";
        }
    }

CustomerRepository.cs

using DBRepository.Interfaces;
using Models;

// 
using System.Threading.Tasks;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;



namespace DBRepository.Repositories
{
    public class CustomerRepository : BaseRepository, ICustomerRepository
    {
        // Constructor
        public CustomerRepository(string connectionString, IRepositoryContextFactory contextFactory) : base(connectionString, contextFactory)
        {

        }

        public async Task<List<Customer>> GetCustomers()
        {
            using (var context = ContextFactory.CreateDbContext(ConnectionString))
            {
                var query = context.Customers.AsQueryable();
                    query = query.Where(p => p.ContactName.Contains("Maria"));
                return await query.ToListAsync();
            }
        }
    }
}

Answer 1

问题出在您的测试代码中。您正在从TestMain执行两次Program.cs。注意，Test1构造函数已经在内部调用了TestMain方法。完成之后，您再手动调用一次。假设您手动调用了一次TestMain，则无需从Test1构造函数中调用它：

[TestFixture]
    public class Test1
    {
        public Test1()
        {
            // Commenting this out.
            //TestMain();
        }

        public Task TestMain()
        {            
            return GetCustomersTest_1();
        }    
        //...

希望这会有所帮助