.NET 支持依賴項注入 (DI) 軟件設(shè)計模式，這是一種在類及其依賴項之間實現(xiàn) 控制 (IoC) 的反轉(zhuǎn) 的技術(shù)

在設(shè)計能夠進行依賴注入的服務(wù)時：

• 避免有狀態(tài)的、靜態(tài)類和成員。 通過將應(yīng)用設(shè)計為改用單一實例服務(wù)，避免創(chuàng)建全局狀態(tài)。
• 避免在服務(wù)中直接實例化依賴類。 直接實例化會將代碼耦合到特定實現(xiàn)。
• 不在服務(wù)中包含過多內(nèi)容，確保設(shè)計規(guī)范，并易于測試。

如果一個類有很多已注入的依賴關(guān)系，這可能表明該類擁有過多的責任，并且違反了單一責任原則 (SRP)。 嘗試通過將某些職責移動到一個新類來重構(gòu)類。

使用的包Microsoft.Extensions.DependencyInjection

參考微軟文檔

.NET 依賴項注入
https://learn.microsoft.com/zh-cn/dotnet/core/extensions/dependency-injection

使用依賴關(guān)系注入
https://learn.microsoft.com/zh-cn/dotnet/core/extensions/dependency-injection-usage

依賴關(guān)系注入指南
https://learn.microsoft.com/zh-cn/dotnet/core/extensions/dependency-injection-guidelines

Program.cs

using WzfgsInfoReportNET6.IBLL;
using WzfgsInfoReportNET6.IBLL_impl;
using WzfgsInfoReportNET6.IDao;
using WzfgsInfoReportNET6.IDao_impl;
using WzfgsInfoReportNET6.Models;


var builder = WebApplication.CreateBuilder(args);

#region 業(yè)務(wù)層接口，實現(xiàn)注冊

builder.Services.AddSingleton<IAnMenusBll, AnMenusBll>();
builder.Services.AddSingleton<IAnRoleBll, AnRoleBll>();
builder.Services.AddSingleton<IAnUserBll, AnUserBll>();
builder.Services.AddSingleton<IArticle2Bll, Article2Bll>();

#endregion

#region 數(shù)據(jù)層接口，實現(xiàn)注冊

builder.Services.AddSingleton<IAdoptedRecordDao, AdoptedRecordDao>();
builder.Services.AddSingleton<IAnMenusDao, AnMenusDao>();
builder.Services.AddSingleton<IAnRoleDao, AnRoleDao>(); 

#endregion

// Add services to the container.
builder.Services.AddControllersWithViews();

var app = builder.Build();
AppHelpter.App = app;


//var kkk = app.Services.GetRequiredService<IAnMenusDao>();
//var bbb = WebApplicationBuilderHelpter.GetServices<ITaskBll>();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

app.Run();

工具類，獲取注冊的實例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;

namespace WzfgsInfoReportNET6.Models 
{
    /// <summary>
    /// 依賴注冊，獲取接口實例
    /// </summary>
    /// 創(chuàng)建時間：2023-4-11 16:48:42。作者：xxx
    public sealed class AppHelpter
    {
        /// <summary>
        /// 程序
        /// </summary>
        public static WebApplication App { get; set; }

        /// <summary>
        /// 獲取接口實例
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        public static T GetServices<T>() where T : notnull
        {
            T instance =  App.Services.GetRequiredService<T>();
            return instance;
        }

    }
}

調(diào)用文章來源地址http://www.zghlxwxcb.cn/news/detail-415169.html

public class AnRoleBll : IAnRoleBll
{
        readonly IAnRoleDao anRoleDao= AppHelpter.GetServices<IAnRoleDao>();
        readonly IAnUserDao anUserDao= AppHelpter.GetServices<IAnUserDao>();
        readonly IRoleFunctionsDao roleFunctionsDao = AppHelpter.GetServices<IRoleFunctionsDao>();

        public async Task<Result> AddAsync(AnRole model)
        {          
            int count = await anRoleDao.AddAsync(model);
            if (count > 0)
            {
                return new Result(true);
            }
            return new Result("新增失敗");
        }
} 

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