autofac 基类属性为 null
这是我对 Asp.Net Mvc 3 的设置：
public abstract class BaseProvider
{
protected ICache Cache;
}
public interface ICache
{
void Add(string key, object data);
void Remove(string key);
...
}
public class MyCache : ICache
{
private static MemoryCache cache = MemoryCache.Default;
void Add(string key, object data)
{
...
}
}
public interface IEmployeeProvider
{
IEnumerable<Employee> GetEmployees(string department);
}
public class EmployeeProvider:BaseProvider,IEmployeeProvider
{
public IEnumerable<Employee> GetEmployees(string department)
{
**if (Cache.Get("employees_"+department)!=null)**
}
}
加星号的行抛出一个错误，指出 Cache 为空。 我尝试将基类注册为类型，但是我想这是错误的。 我的 Autofac 设置是这样的：
builder.Register(r => new EmployeeProvider()).As<IEmployeeProvider>().InstancePerHttpRequest();
builder.Register(r => new MyCache()).As<ICache>().InstancePerHttpRequest();
builder.RegisterType<BaseProvider>().PropertiesAutowired();
我缺少什么？
Here is my setup with Asp.Net Mvc 3:
public abstract class BaseProvider
{
protected ICache Cache;
}
public interface ICache
{
void Add(string key, object data);
void Remove(string key);
...
}
public class MyCache : ICache
{
private static MemoryCache cache = MemoryCache.Default;
void Add(string key, object data)
{
...
}
}
public interface IEmployeeProvider
{
IEnumerable<Employee> GetEmployees(string department);
}
public class EmployeeProvider:BaseProvider,IEmployeeProvider
{
public IEnumerable<Employee> GetEmployees(string department)
{
**if (Cache.Get("employees_"+department)!=null)**
}
}
Starred line throws an error saying that Cache is null.
I tried to register the base class as a type but, I guess it is wrong.
My Autofac setup is like this:
builder.Register(r => new EmployeeProvider()).As<IEmployeeProvider>().InstancePerHttpRequest();
builder.Register(r => new MyCache()).As<ICache>().InstancePerHttpRequest();
builder.RegisterType<BaseProvider>().PropertiesAutowired();
What am I missing?
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评论（1）
您应该使用
PropertiesAutowired()注册EmployeeProvider或扫描程序集以查找从BaseProvider继承的每个类。第一个注册忘记了
PropertiesAutowired()，第三行忘记了EmployeeProvider。You should either register
EmployeeProviderwithPropertiesAutowired()or scan the assembly for every class that inherits fromBaseProvider.The first registration forgets the
PropertiesAutowired(), the third line forgets theEmployeeProvider.