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  • 扩展与解耦:Option模式与依赖注入结合

    参考 ABP设计UI菜单栏的源码分析,抽出了ABP这块自定义扩展的实现。在ABP的源码里面有很多地方都用到了这种设计方式,实现了用户自定义扩展。

    新建一个空的asp.net core项目,新建一个类,源码:

    using Microsoft.Extensions.Options;
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;
    
    namespace DesignPatternSample.Infrastructure
    {
        public class LanguageInfo
        {
            public string CultureName { get; set; }
    
            public string DisplayName { get; set; }
    
            public LanguageInfo(string cultureName, string displayName)
            {
                CultureName = cultureName;
                DisplayName = displayName;
            }
    
        }
    
        public class AbpSampleOptions
        {
            public List<LanguageInfo> Languages { get; }
    
            public AbpSampleOptions()
            {
                Languages = new List<LanguageInfo>();
            }
        }
    
        public interface ILanguageProvider
        {
            Task<IReadOnlyList<LanguageInfo>> GetLanguagesAsync();
        }
    
        public class DefaultLanguageProvider : ILanguageProvider
        {
            protected AbpSampleOptions Options { get; }
    
            public DefaultLanguageProvider(IOptions<AbpSampleOptions> options)
            {
                Options = options.Value;
            }
    
            public Task<IReadOnlyList<LanguageInfo>> GetLanguagesAsync()
            {
                return Task.FromResult((IReadOnlyList<LanguageInfo>)Options.Languages);
            }
        }
    }
    
    

    StartUp类源码:

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;
    using DesignPatternSample.Infrastructure;
    using Microsoft.AspNetCore.Builder;
    using Microsoft.AspNetCore.Hosting;
    using Microsoft.AspNetCore.Http;
    using Microsoft.Extensions.DependencyInjection;
    using Microsoft.Extensions.Hosting;
    
    namespace DesignPatternSample
    {
        public class Startup
        {
            // This method gets called by the runtime. Use this method to add services to the container.
            // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
            public void ConfigureServices(IServiceCollection services)
            {
                // 依赖注入
                services.AddTransient<ILanguageProvider, DefaultLanguageProvider>();
    
                // 配置多语言
                services.Configure<AbpSampleOptions>(options =>
                {
                    options.Languages.Add(new LanguageInfo( "cs", "Čeština"));
                    options.Languages.Add(new LanguageInfo("en", "English"));
                    options.Languages.Add(new LanguageInfo("pt-BR", "Português"));
                    options.Languages.Add(new LanguageInfo("tr", "Türkçe"));
                    options.Languages.Add(new LanguageInfo("zh-Hans", "简体中文"));
                });
            }
    
            // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
            public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILanguageProvider provider)
            {
                if (env.IsDevelopment())
                {
                    app.UseDeveloperExceptionPage();
                }
    
                app.UseRouting();
                app.UseEndpoints(endpoints =>
                {
                    // 测试
                    endpoints.MapGet("/Abp/Test", async context =>
                    {
                        var result = provider.GetLanguagesAsync();
                        var output = string.Join(",", result.Result.Select(s => s.CultureName).ToArray());
                        await context.Response.WriteAsync(output);
                    });
                });
            }
        }
    }
    
    

    扩展点:在ConfigureService中提供用户自定义扩展点,完美的是下了解耦。

    参考:

    BookStore示例项目---菜单栏UI分析

    Options模式的应用

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  • 原文地址:https://www.cnblogs.com/zhiyong-ITNote/p/12643396.html
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