ASP.NET Core MVC中Area的使用

首先，在Solution Explorer下新建一个Areas文件夹。

然后右击该文件夹，选择“Add” -> “Area”，新建Area。如下所示：

然后分别设置其相应的Controller和View。

AnotherController.cs

[Area("AnotherArea")]
public class AnotherController : Controller
{
    public IActionResult Index()
    {
        return View();
    }
}

Index.cshtml

@{
    ViewData["Title"] = "Another Page";
}

<div class="text-center">
    <h1 class="display-4">Another Index</h1>
</div>

在这里新建一个Controller（ShowMessageController），然后将默认的路由导向该Controller。

ShowMessageController.cs

public class ShowMessageController : Controller
{
    public IActionResult Index()
    {
        return View();
    }
}

Index.cshtml

@{
    Layout = null;
}

<div class="text-center">
    <h1 class="display-4">ShowMessage Index</h1>
    <ul>
        <li><a class="dropdown-item" asp-area="MyAreaTest" asp-controller="ShowTest" asp-action="Index">Show Test</a></li>
        <li><a class="dropdown-item" asp-area="AnotherArea" asp-controller="Another" asp-action="Index">Another</a></li>
        <li><a class="dropdown-item" asp-area="MyThirdArea" asp-controller="Third" asp-action="Index">Third</a></li>
    </ul>
</div>

再在Startup.cs中设置路由。

public class Startup
{

   // ...

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        // ...

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapAreaControllerRoute(
                name: "MyAreaTest",
                areaName: "MyAreaTest",
                pattern: "MyAreaTest/{controller=ShowTest}/{action=Index}/{id?}");

            endpoints.MapAreaControllerRoute(
                name: "AnotherArea",
                areaName: "AnotherArea",
                pattern: "AnotherArea/{controller=Another}/{action=Index}/{id?}");

            endpoints.MapAreaControllerRoute(
                name: "MyThirdArea",
                areaName: "MyThirdArea",
                pattern: "MyThirdArea/{controller=Third}/{action=Index}/{id?}");

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