# 23.5、快捷操作

## 如何在实例类/静态类中使用接口，比如仓储？

由于我们目前采用的是自动抽象工厂模式，也就是面向接口编程，对象都是通过 **依赖注入/控制反转**创建的，所以我们通常在 类的构造函数中注入对象

但是，有一些特殊情况，我们需要在静态类或实例类中也能够使用这些接口，而非通过构造函数注入的方式。

* 获取数据库操作`仓储实例`对象

```csharp
var repository = AppGlobal.GetRepository<TableEntity>();
var entities = repository.GetAll(u=>u.Id > 1).ToList();
```

* 获取 `Autofac`注入的接口实例对象

```csharp
var service = AppGlobal.AutofacContainer.Resolve<IHoaApplicationService>();
```

* 获取 `ASP.NET Core` 注入的对象，比如内存缓存

```csharp
var _cache = AppGlobal.ServiceProvider.GetService<IMemoryCache>();
```

* 获取多上下文对象 `IDynamicRepository<TEntity, DbContextIdentifier>`

```csharp
var dynamicRepository = AppGlobal.GetDynamicRepository<TableEntity, DbContextIdentifier>(nameof(DbContextIdentifier));
```

* 获取选项配置

```csharp
var options = AppGlobal.GetOptions<AppOptions>();
```


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