Passingwind

ITypeFinder 接口 :

    /// <summary>
    /// Classes implementing this interface provide information about types 
    /// to various services in the Nop engine.
    /// </summary>
    public interface ITypeFinder
    {
        IList<Assembly> GetAssemblies();

        IEnumerable<Type> FindClassesOfType(Type assignTypeFrom, bool onlyConcreteClasses = true);

        IEnumerable<Type> FindClassesOfType(Type assignTypeFrom, IEnumerable<Assembly> assemblies, bool onlyConcreteClasses = true);

        IEnumerable<Type> FindClassesOfType<T>(bool onlyConcreteClasses = true);

        IEnumerable<Type> FindClassesOfType<T>(IEnumerable<Assembly> assemblies, bool onlyConcreteClasses = true);
    }

AppDomainTypeFinder ：

    /// <summary>
    /// A class that finds types needed by Nop by looping assemblies in the 
    /// currently executing AppDomain. Only assemblies whose names matches
    /// certain patterns are investigated and an optional list of assemblies
    /// referenced by <see cref="AssemblyNames"/> are always investigated.
    /// </summary>
    public class AppDomainTypeFinder : ITypeFinder
    {
        #region Fields

        private bool ignoreReflectionErrors = true;
        private bool loadAppDomainAssemblies = true;
        private string assemblySkipLoadingPattern = "^System|^mscorlib|^Microsoft|^AjaxControlToolkit|^Antlr3|^Autofac|^AutoMapper|^Castle|^ComponentArt|^CppCodeProvider|^DotNetOpenAuth|^EntityFramework|^EPPlus|^FluentValidation|^ImageResizer|^itextsharp|^log4net|^MaxMind|^MbUnit|^MiniProfiler|^Mono.Math|^MvcContrib|^Newtonsoft|^NHibernate|^nunit|^Org.Mentalis|^PerlRegex|^QuickGraph|^Recaptcha|^Remotion|^RestSharp|^Rhino|^Telerik|^Iesi|^TestDriven|^TestFu|^UserAgentStringLibrary|^VJSharpCodeProvider|^WebActivator|^WebDev|^WebGrease";
        private string assemblyRestrictToLoadingPattern = ".*";
        private IList<string> assemblyNames = new List<string>();

        #endregion

        #region Ctor

        /// <summary>Creates a new instance of the AppDomainTypeFinder.</summary>
        public AppDomainTypeFinder()
        {
        }

        #endregion

        #region Properties

        /// <summary>The app domain to look for types in.</summary>
        public AppDomain App
        {
            get { return AppDomain.CurrentDomain; }
        }

        /// <summary>Gets or sets wether Nop should iterate assemblies in the app domain when loading Nop types. Loading patterns are applied when loading these assemblies.</summary>
        public bool LoadAppDomainAssemblies
        {
            get { return loadAppDomainAssemblies; }
            set { loadAppDomainAssemblies = value; }
        }

        /// <summary>Gets or sets assemblies loaded a startup in addition to those loaded in the AppDomain.</summary>
        public IList<string> AssemblyNames
        {
            get { return assemblyNames; }
            set { assemblyNames = value; }
        }

        /// <summary>Gets the pattern for dlls that we know don't need to be investigated.</summary>
        public string AssemblySkipLoadingPattern
        {
            get { return assemblySkipLoadingPattern; }
            set { assemblySkipLoadingPattern = value; }
        }

        /// <summary>Gets or sets the pattern for dll that will be investigated. For ease of use this defaults to match all but to increase performance you might want to configure a pattern that includes assemblies and your own.</summary>
        /// <remarks>If you change this so that Nop assemblies arn't investigated (e.g. by not including something like "^Nop|..." you may break core functionality.</remarks>
        public string AssemblyRestrictToLoadingPattern
        {
            get { return assemblyRestrictToLoadingPattern; }
            set { assemblyRestrictToLoadingPattern = value; }
        }

        #endregion

        #region Methods

        public IEnumerable<Type> FindClassesOfType<T>(bool onlyConcreteClasses = true)
        {
            return FindClassesOfType(typeof(T), onlyConcreteClasses);
        }

        public IEnumerable<Type> FindClassesOfType(Type assignTypeFrom, bool onlyConcreteClasses = true)
        {
            return FindClassesOfType(assignTypeFrom, GetAssemblies(), onlyConcreteClasses);
        }

        public IEnumerable<Type> FindClassesOfType<T>(IEnumerable<Assembly> assemblies, bool onlyConcreteClasses = true)
        {
            return FindClassesOfType(typeof(T), assemblies, onlyConcreteClasses);
        }

        public IEnumerable<Type> FindClassesOfType(Type assignTypeFrom, IEnumerable<Assembly> assemblies, bool onlyConcreteClasses = true)
        {
            var result = new List<Type>();
            try
            {
                foreach (var a in assemblies)
                {
                    Type[] types = null;
                    try
                    {
                        types = a.GetTypes();
                    }
                    catch
                    {
                        //Entity Framework 6 doesn't allow getting types (throws an exception)
                        if (!ignoreReflectionErrors)
                        {
                            throw;
                        }
                    }
                    if (types != null)
                    {
                        foreach (var t in types)
                        {
                            if (assignTypeFrom.IsAssignableFrom(t) || (assignTypeFrom.IsGenericTypeDefinition && DoesTypeImplementOpenGeneric(t, assignTypeFrom)))
                            {
                                if (!t.IsInterface)
                                {
                                    if (onlyConcreteClasses)
                                    {
                                        if (t.IsClass && !t.IsAbstract)
                                        {
                                            result.Add(t);
                                        }
                                    }
                                    else
                                    {
                                        result.Add(t);
                                    }
                                }
                            }
                        }
                    }
                }
            }
            catch (ReflectionTypeLoadException ex)
            {
                var msg = string.Empty;
                foreach (var e in ex.LoaderExceptions)
                    msg += e.Message + Environment.NewLine;

                var fail = new Exception(msg, ex);
                Debug.WriteLine(fail.Message, fail);

                throw fail;
            }
            return result;
        }

        /// <summary>Gets the assemblies related to the current implementation.</summary>
        /// <returns>A list of assemblies that should be loaded by the Nop factory.</returns>
        public virtual IList<Assembly> GetAssemblies()
        {
            var addedAssemblyNames = new List<string>();
            var assemblies = new List<Assembly>();

            if (LoadAppDomainAssemblies)
                AddAssembliesInAppDomain(addedAssemblyNames, assemblies);
            AddConfiguredAssemblies(addedAssemblyNames, assemblies);

            return assemblies;
        }

        #endregion

        #region Utilities

        /// <summary>
        /// Iterates all assemblies in the AppDomain and if it's name matches the configured patterns add it to our list.
        /// </summary>
        /// <param name="addedAssemblyNames"></param>
        /// <param name="assemblies"></param>
        private void AddAssembliesInAppDomain(List<string> addedAssemblyNames, List<Assembly> assemblies)
        {
            foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies())
            {
                if (Matches(assembly.FullName))
                {
                    if (!addedAssemblyNames.Contains(assembly.FullName))
                    {
                        assemblies.Add(assembly);
                        addedAssemblyNames.Add(assembly.FullName);
                    }
                }
            }
        }

        /// <summary>
        /// Adds specificly configured assemblies.
        /// </summary>
        /// <param name="addedAssemblyNames"></param>
        /// <param name="assemblies"></param>
        protected void AddConfiguredAssemblies(List<string> addedAssemblyNames, List<Assembly> assemblies)
        {
            foreach (string assemblyName in AssemblyNames)
            {
                Assembly assembly = Assembly.Load(assemblyName);
                if (!addedAssemblyNames.Contains(assembly.FullName))
                {
                    assemblies.Add(assembly);
                    addedAssemblyNames.Add(assembly.FullName);
                }
            }
        }

        /// <summary>
        /// Check if a dll is one of the shipped dlls that we know don't need to be investigated.
        /// </summary>
        /// <param name="assemblyFullName">
        /// The name of the assembly to check.
        /// </param>
        /// <returns>
        /// True if the assembly should be loaded into Nop.
        /// </returns>
        public bool Matches(string assemblyFullName)
        {
            return !Matches(assemblyFullName, AssemblySkipLoadingPattern)
                   && Matches(assemblyFullName, AssemblyRestrictToLoadingPattern);
        }

        /// <summary>
        /// Check if a dll is one of the shipped dlls that we know don't need to be investigated.
        /// </summary>
        /// <param name="assemblyFullName">
        /// The assembly name to match.
        /// </param>
        /// <param name="pattern">
        /// The regular expression pattern to match against the assembly name.
        /// </param>
        /// <returns>
        /// True if the pattern matches the assembly name.
        /// </returns>
        protected bool Matches(string assemblyFullName, string pattern)
        {
            return Regex.IsMatch(assemblyFullName, pattern, RegexOptions.IgnoreCase | RegexOptions.Compiled);
        }

        /// <summary>
        /// Makes sure matching assemblies in the supplied folder are loaded in the app domain.
        /// </summary>
        /// <param name="directoryPath">
        /// The physical path to a directory containing dlls to load in the app domain.
        /// </param>
        protected void LoadMatchingAssemblies(string directoryPath)
        {
            var loadedAssemblyNames = new List<string>();
            foreach (Assembly a in GetAssemblies())
            {
                loadedAssemblyNames.Add(a.FullName);
            }

            if (!Directory.Exists(directoryPath))
            {
                return;
            }

            foreach (string dllPath in Directory.GetFiles(directoryPath, "*.dll"))
            {
                try
                {
                    var an = AssemblyName.GetAssemblyName(dllPath);
                    if (Matches(an.FullName) && !loadedAssemblyNames.Contains(an.FullName))
                    {
                        App.Load(an);
                    }

                    //old loading stuff
                    //Assembly a = Assembly.ReflectionOnlyLoadFrom(dllPath);
                    //if (Matches(a.FullName) && !loadedAssemblyNames.Contains(a.FullName))
                    //{
                    //    App.Load(a.FullName);
                    //}
                }
                catch (BadImageFormatException ex)
                {
                    Trace.TraceError(ex.ToString());
                }
            }
        }

        /// <summary>
        /// Does type implement generic?
        /// </summary>
        /// <param name="type"></param>
        /// <param name="openGeneric"></param>
        /// <returns></returns>
        protected bool DoesTypeImplementOpenGeneric(Type type, Type openGeneric)
        {
            try
            {
                var genericTypeDefinition = openGeneric.GetGenericTypeDefinition();
                foreach (var implementedInterface in type.FindInterfaces((objType, objCriteria) => true, null))
                {
                    if (!implementedInterface.IsGenericType)
                        continue;

                    var isMatch = genericTypeDefinition.IsAssignableFrom(implementedInterface.GetGenericTypeDefinition());
                    return isMatch;
                }
                return false;
            }
            catch
            {
                return false;
            }
        }

        #endregion
    }

WebAppTypeFinder ：

    /// <summary>
    /// Provides information about types in the current web application. 
    /// Optionally this class can look at all assemblies in the bin folder.
    /// </summary>
    public class WebAppTypeFinder : AppDomainTypeFinder
    {
        #region Fields

        private bool _ensureBinFolderAssembliesLoaded = true;
        private bool _binFolderAssembliesLoaded = false;

        #endregion

        #region Ctor

        public WebAppTypeFinder(bool dynamicDiscovery = true)
        {
            this._ensureBinFolderAssembliesLoaded = dynamicDiscovery;
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets or sets wether assemblies in the bin folder of the web application should be specificly checked for beeing loaded on application load. This is need in situations where plugins need to be loaded in the AppDomain after the application been reloaded.
        /// </summary>
        public bool EnsureBinFolderAssembliesLoaded
        {
            get { return _ensureBinFolderAssembliesLoaded; }
            set { _ensureBinFolderAssembliesLoaded = value; }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Gets a physical disk path of \Bin directory
        /// </summary>
        /// <returns>The physical path. E.g. "c:\inetpub\wwwroot\bin"</returns>
        public string GetBinDirectory()
        {
            if (HostingEnvironment.IsHosted)
            {
                //hosted
                return HttpRuntime.BinDirectory;
            }
            else
            {
                //not hosted. For example, run either in unit tests
                return AppDomain.CurrentDomain.BaseDirectory;
            }
        }

        public override IList<Assembly> GetAssemblies()
        {
            if (this.EnsureBinFolderAssembliesLoaded && !_binFolderAssembliesLoaded)
            {
                _binFolderAssembliesLoaded = true;
                string binPath = GetBinDirectory();
                //binPath = _webHelper.MapPath("~/bin");
                LoadMatchingAssemblies(binPath);
            }

            return base.GetAssemblies();
        }

        #endregion
    }

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