abp实战-ContosoUniversity Abp版-2添加菜单与创建实体

这里略过理论篇，但需要了解abp分层，对于小项目来说abp分层有点复杂，这里只是演示，个别地方没有完全按照ddd理论去写，后期我将会完善。

1. 创建ContosoUniversity相关功能的菜单

在vs2019中，按快捷键“ctrl+,”输入navigationprovider,会出现ContosoAbpNavigationProvider类，这个类中存放了整个系统的菜单：
它位于ContosoAbp.Web.MVC项目的Startup文件夹中:

菜单的定义为MenuItemDefinition,第一个参数为菜单项，这个在cshtml中使用到，以便切换到该页面时，该菜单项处于选中状态，第二个参数为菜单名称，为多语言配置，这里只配置中英文，需要找到ContosoAbp.xml和ContosoAbp-zh-Hans.xml分别配置菜单名称，第三个参数为url，可以为相对地址，也可以为外部地址，第四个参数为图标，第五个参数为页面权限；这里暂时没有配置icon和权限； SetNavigation方法中添加菜单，修改如下：

 public override void SetNavigation(INavigationProviderContext context)
        {
            context.Manager.MainMenu
                .AddItem(
                    new MenuItemDefinition(
                        PageNames.Home,
                        L("HomePage"),
                        url: "",
                        icon: "home",
                        requiresAuthentication: true
                    )
                ).AddItem(
                    new MenuItemDefinition(
                        PageNames.Contoso,
                        L("ContosoUniversity"),
                        url: "",
                        icon: "business"
                    ).AddItem(
                            new MenuItemDefinition(
                                PageNames.CUStudent,
                                L("CUStudent"),
                                url: "Student"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                PageNames.CUCourse,
                                L("CUCourse"),
                                url: "Course"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                PageNames.CUInstructor,
                                L("CUInstructor"),
                                url: "Instructor"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                PageNames.CUDepartment,
                                L("CUDepartment"),
                                url: "Department"
                            )
                        )
                ).AddItem(
                    new MenuItemDefinition(
                        PageNames.Tenants,
                        L("Tenants"),
                        url: "Tenants",
                        icon: "business",
                        requiredPermissionName: PermissionNames.Pages_Tenants
                    )
                ).AddItem(
                    new MenuItemDefinition(
                        PageNames.Users,
                        L("Users"),
                        url: "Users",
                        icon: "people",
                        requiredPermissionName: PermissionNames.Pages_Users
                    )
                ).AddItem(
                    new MenuItemDefinition(
                        PageNames.Roles,
                        L("Roles"),
                        url: "Roles",
                        icon: "local_offer",
                        requiredPermissionName: PermissionNames.Pages_Roles
                    )
                )
                .AddItem(
                    new MenuItemDefinition(
                        PageNames.About,
                        L("About"),
                        url: "About",
                        icon: "info"
                    )
                ).AddItem( // Menu items below is just for demonstration!
                    new MenuItemDefinition(
                        "MultiLevelMenu",
                        L("MultiLevelMenu"),
                        icon: "menu"
                    ).AddItem(
                        new MenuItemDefinition(
                            "AspNetBoilerplate",
                            new FixedLocalizableString("ASP.NET Boilerplate")
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetBoilerplateHome",
                                new FixedLocalizableString("Home"),
                                url: "https://aspnetboilerplate.com?ref=abptmpl"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetBoilerplateTemplates",
                                new FixedLocalizableString("Templates"),
                                url: "https://aspnetboilerplate.com/Templates?ref=abptmpl"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetBoilerplateSamples",
                                new FixedLocalizableString("Samples"),
                                url: "https://aspnetboilerplate.com/Samples?ref=abptmpl"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetBoilerplateDocuments",
                                new FixedLocalizableString("Documents"),
                                url: "https://aspnetboilerplate.com/Pages/Documents?ref=abptmpl"
                            )
                        )
                    ).AddItem(
                        new MenuItemDefinition(
                            "AspNetZero",
                            new FixedLocalizableString("ASP.NET Zero")
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetZeroHome",
                                new FixedLocalizableString("Home"),
                                url: "https://aspnetzero.com?ref=abptmpl"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetZeroDescription",
                                new FixedLocalizableString("Description"),
                                url: "https://aspnetzero.com/?ref=abptmpl#description"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetZeroFeatures",
                                new FixedLocalizableString("Features"),
                                url: "https://aspnetzero.com/?ref=abptmpl#features"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetZeroPricing",
                                new FixedLocalizableString("Pricing"),
                                url: "https://aspnetzero.com/?ref=abptmpl#pricing"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetZeroFaq",
                                new FixedLocalizableString("Faq"),
                                url: "https://aspnetzero.com/Faq?ref=abptmpl"
                            )
                        ).AddItem(
                            new MenuItemDefinition(
                                "AspNetZeroDocuments",
                                new FixedLocalizableString("Documents"),
                                url: "https://aspnetzero.com/Documents?ref=abptmpl"
                            )
                        )
                    )
                );
        }

        private static ILocalizableString L(string name)
        {
            return new LocalizableString(name, ContosoAbpConsts.LocalizationSourceName);
        }
    }

菜单文字配置：

2. 创建实体

创建实体是在ContosoAbp.Core项目里，这里先创建Student,Enrollment和Course实体；

3. 在数据库上下文中添加实体对应的数据集

abp强大的地方在于，它虽然提供了仓储模式和工作单元模式，但你依然可以选择最原始的Context用最原始的方法。
数据库上下文定义在ContosoAbp.EntityFrameworkCore项目的EntityFrameworkCore文件夹下，修改如下：

4.添加种子数据

添加初始化数据在ContosoAbp.EntityFrameworkCore项目下的 Seed的文件夹下，这里在Host(租主)文件夹下新建类：DefaultContosoCreator.cs,在这里模仿其他类，添加初始化数据，这里要去除context.SaveChanges();因为后面会统一保存数据，之后在InitialHostDbBuilder.cs添加 new DefaultSettingsCreator(_context).Create();

5. 数据迁移

在程序包管理控制台中执行命令：
add-migration InitialContosoEntities
再执行：update-database;
运行项目，当成功显示界面后，初始化数据会自动写入数据库。