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现在，ASP.NET MVC 6 支持注入类到视图中，和VC类不同的是，对类是公开的、非嵌套或非抽象并没有限制。在这个例子中，我们创建了一个简单的类，用于统计×××事件、已完成事件和平均优先级的服务。
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StatisticsService 类代码设计如下：
using System.Linq;
using System.Threading.Tasks;
using TodoList.Models;
namespace TodoList.Services
{public class StatisticsService
{private readonly ApplicationDbContext db;
public StatisticsService(ApplicationDbContext context)
{db = context;
}
public async TaskGetCount()
{return await Task.FromResult(db.TodoItems.Count());
}
public async TaskGetCompletedCount()
{return await Task.FromResult(
db.TodoItems.Count(x => x.IsDone == true));
}
public async TaskGetAveragePriority()
{return await Task.FromResult(
db.TodoItems.Average(x =>
(double?)x.Priority) ?? 0.0);
}
}
}
@inject TodoList.Services.StatisticsService Statistics
添加标记调用 StatisticsService：
@Html.ActionLink("Create New Todo", "Create", "Todo")
@await Component.InvokeAsync("PriorityList", 4, true)Stats
以下是该文件的完整代码：
@inject TodoList.Services.StatisticsService Statistics
@{ViewBag.Title = "Home Page";
}
ASP.NET vNext
@if (Model.Count == 0)
{No Todo Items
}
else
{| TODO | |
|---|---|
| @todo.Title | @Html.ActionLink("Details", "Details", "Todo", new { id = todo.Id }) | @Html.ActionLink("Edit", "Edit", "Todo", new { id = todo.Id }) | @Html.ActionLink("Delete", "Delete", "Todo", new { id = todo.Id }) |
}
@Html.ActionLink("Create New Todo", "Create", "Todo")
@await Component.InvokeAsync("PriorityList", 4, true)Stats
// This method gets called by the runtime.
public void ConfigureServices(IServiceCollection services)
{// Add EF services to the services container.
services.AddEntityFramework(Configuration)
.AddSqlServer()
.AddDbContext();
// Add Identity services to the services container.