将代码移出控制器并移入 .NET Core 中的辅助方法类的最佳方法是什么

Question

如何将重复的代码部分从控制器中移出到 Helper Method 类，而不必在 .NET Core 中重复代码？如果我需要提供更多详细信息，请告诉我。

我需要将所有重复代码部分移出此控制器，以便我可以在需要它的所有其他控制器中调用此方法

用户控制器：

using myApp.Data;
using myApp.Models;
using myApp.Models.ViewModels;
using myApp.Utilities;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI.Services;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
    
namespace myApp.Controllers
{
    [Authorize]
    public class UserController : Controller
    {
        private readonly ApplicationDbContext db;
        private readonly UserManager<ApplicationUser> userManager;
  
        public UserController(  ApplicationDbContext db,
                        UserManager<ApplicationUser> userManager)
        {
            this.db = db;
            this.userManager = userManager;
        }
    
        [HttpGet]
        public async Task<IActionResult> UpdateUserDetails(UpdateUserViewModel model)
        {
            if (ModelState.IsValid)
            {
                var user = await userManager.FindByIdAsync(model.Id);

                if (user == null)
                {   
                    //Calling Repeated Code in this controller
                    return UserNotFound();
                }
                else
                {
                    user.FirstName = model.FirstName;
                    user.LastName = model.LastName;
                    user.UserName = model.UserName;
                    user.PhoneNumber = model.PhoneNumber;
                }

                var result = await userManager.UpdateAsync(user);

                if (result.Succeeded)
                {
                    //Calling Repeated Code in this controller
                    return UpdateSuccess();
                }

                AddErrors(result);
            }

            return View(model);
        }
            
        //REPEATED CODE SECTION BEGINS (Extracted out of UpdateUserDetails Controller)
        public IActionResult UserNotFound()
        {
            TempData[HelperStatic.ErrorMessage] = HelperStatic.userNotFoundMsg;
            return View(HelperStatic.notFoundView);
        }
        
        public IActionResult UpdateSuccess()
        {
            TempData[HelperStatic.SuccessMessage] = HelperStatic.recordUpdatedMsg;
            return RedirectToAction(nameof(Index));
        }

        //REPEATED CODE SECTION ENDS
   }
}

项目中已经存在一个静态助手类，它只有静态常量。

上述控制器中使用的静态辅助类：

namespace myApp.Utilities
{
    public static class HelperStatic
    {
        // Messages
        public const string SuccessMessage = "Success";
        public const string ErrorMessage = "Error";
        public const string userNotFoundMsg = "User not found";
        public const string recordUpdatedMsg = "Record updated";

        // Views
        public const string notFoundView = "NotFound";
    }
}

我需要一个具有可重用操作方法的不同 HelperMethod 类。我如何做到这一点？

Answer 1

创建一个控制器基类并将所有实用程序方法移入其中，而不是帮助类。

public class BaseController : Controller
{
    public IActionResult UserNotFound()
    {
        TempData[HelperStatic.ErrorMessage] = HelperStatic.userNotFoundMsg;
        return View(HelperStatic.notFoundView);
    }

    public IActionResult UpdateSuccess()
    {
        TempData[HelperStatic.SuccessMessage] = HelperStatic.recordUpdatedMsg;
        return RedirectToAction(nameof(Index));
    }
}

你可以这样使用它。

public class HomeController : BaseController
{
    public IActionResult Index()
    {
        UserNotFound();
        return View();
    }
}