我有一个大型应用程序,目前是 WebForms 和 MVC 2.0 的混合体。我的应用程序的启动很糟糕,罪魁祸首主要是因为 AreaRegistration.RegisterAllAreas
调用。更具体地说,它正在使用 System.Web。 Compilation.BuildManager.GetReferencedAssemblies
枚举应用程序直接引用的程序集中的所有类型,并测试它们是否派生自 AreaRegistration
。
不幸的是,我有许多第三方程序集恰好非常广泛,所以这个初始负载可能非常糟糕。如果我可以告诉它要查找哪些程序集 AreaRegistrations
,或者暂时手动注册区域,我会得到更好的结果。
我可以收集 AreaRegistration
的所有内部信息来创建和调用注册,但我很好奇是否其他人已经遇到并解决了这个问题。
最佳答案
我整理了以下实用程序来隔离用于注册区域的程序集。我不得不破解区域注册的内部结构,但它们似乎并不复杂,而且对我来说运行得相当好:
using System;
using System.Linq;
using System.Reflection;
using System.Web.Mvc;
using System.Web.Routing;
namespace MyCompany.Web.Mvc
{
/// <summary>
/// Provides helpful utilities for performing area registration, where <see cref="AreaRegistration.RegisterAllAreas()"/> may not suffice.
/// </summary>
public static class AreaRegistrationUtil
{
/// <summary>
/// Registers all areas found in the assembly containing the given type.
/// </summary>
/// <typeparam name="T">A type that derives from <see cref="AreaRegistration"/> and has a default constructor.</typeparam>
public static void RegisterAreasForAssemblyOf<T>()
where T : AreaRegistration, new()
{
RegisterAreasForAssemblyOf<T>(null);
}
/// <summary>
/// Registers all areas found in the assembly containing the given type.
/// </summary>
/// <typeparam name="T">A type that derives from <see cref="AreaRegistration"/> and has a default constructor.</typeparam>
/// <param name="state">An object containing state that will be passed to the area registration.</param>
public static void RegisterAreasForAssemblyOf<T>(object state)
where T : AreaRegistration, new()
{
RegisterAreasForAssemblies(state, typeof (T).Assembly);
}
/// <summary>
/// Registers all areas found in the given assemblies.
/// </summary>
/// <param name="assemblies"><see cref="Assembly"/> objects containing the prospective area registrations.</param>
public static void RegisterAreasForAssemblies(params Assembly[] assemblies)
{
RegisterAreasForAssemblies(null, assemblies);
}
/// <summary>
/// Registers all areas found in the given assemblies.
/// </summary>
/// <param name="state">An object containing state that will be passed to the area registration.</param>
/// <param name="assemblies"><see cref="Assembly"/> objects containing the prospective area registrations.</param>
public static void RegisterAreasForAssemblies(object state, params Assembly[] assemblies)
{
foreach (Type type in
from assembly in assemblies
from type in assembly.GetTypes()
where IsAreaRegistrationType(type)
select type)
{
RegisterArea((AreaRegistration) Activator.CreateInstance(type), state);
}
}
/// <summary>
/// Performs area registration using the specified type.
/// </summary>
/// <typeparam name="T">A type that derives from <see cref="AreaRegistration"/> and has a default constructor.</typeparam>
public static void RegisterArea<T>()
where T : AreaRegistration, new()
{
RegisterArea<T>(null);
}
/// <summary>
/// Performs area registration using the specified type.
/// </summary>
/// <typeparam name="T">A type that derives from <see cref="AreaRegistration"/> and has a default constructor.</typeparam>
/// <param name="state">An object containing state that will be passed to the area registration.</param>
public static void RegisterArea<T>(object state)
where T : AreaRegistration, new()
{
var registration = Activator.CreateInstance<T>();
RegisterArea(registration, state);
}
private static void RegisterArea(AreaRegistration registration, object state)
{
var context = new AreaRegistrationContext(registration.AreaName, RouteTable.Routes, state);
string ns = registration.GetType().Namespace;
if (ns != null) context.Namespaces.Add(string.Format("{0}.*", ns));
registration.RegisterArea(context);
}
/// <summary>
/// Returns whether or not the specified type is assignable to <see cref="AreaRegistration"/>.
/// </summary>
/// <param name="type">A <see cref="Type"/>.</param>
/// <returns>True if the specified type is assignable to <see cref="AreaRegistration"/>; otherwise, false.</returns>
private static bool IsAreaRegistrationType(Type type)
{
return (typeof (AreaRegistration).IsAssignableFrom(type) && (type.GetConstructor(Type.EmptyTypes) != null));
}
}
}
对我来说,最简单的使用方法是
AreaRegistrationUtil.RegisterAreasForAssemblyOf<SomeTypeInTargetAssembly>();
这显着缩短了启动时间,但代价是无法进入某个区域并让应用程序自动注册它。但是,在这种情况下,这不是我关心的问题。
关于c# - 在为 ASP.NET MVC 2.0 应用程序注册区域时提供或过滤程序集,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2496956/