扫描程序集找到实现了某个接口的第一个实例

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<pre name="code" class="csharp">using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Reflection;using System.Web;namespace HS.Comm.Utility{    /// <summary>    /// 程序集反射辅助类    /// </summary>    public static class AssemblyHelper    {        /// <summary>        /// 得到入口程序集，兼容Web和Winform        /// </summary>        /// <returns></returns>        public static Assembly GetEntryAssembly()        {            var entryAssembly = Assembly.GetEntryAssembly();            if (entryAssembly != null)                return entryAssembly;                        if (System.Web.HttpContext.Current == null ||                System.Web.HttpContext.Current.ApplicationInstance == null)                return Assembly.GetExecutingAssembly();            var type = System.Web.HttpContext.Current.ApplicationInstance.GetType();            while (type != null && type.Namespace == "ASP")            {                type = type.BaseType;            }            return type == null ? null : type.Assembly;        }                public static IList<Stream> GetResourceStream(Assembly assembly, System.Linq.Expressions.Expression<Func<string, bool>> predicate)        {            List<Stream> result = new List<Stream>();            foreach (string resource in assembly.GetManifestResourceNames())            {                if (predicate.Compile().Invoke(resource))                {                    result.Add(assembly.GetManifestResourceStream(resource));                }            }            StreamReader sr = new StreamReader(result[0]);            string r = sr.ReadToEnd();            result[0].Position = 0;            return result;        }        /// <summary>        /// 扫描程序集找到继承了某基类的所有子类        /// </summary>        /// <param name="inheritType">基类</param>        /// <param name="searchpattern">文件名过滤</param>        /// <returns></returns>        public static List<Type> FindTypeByInheritType(Type inheritType, string searchpattern = "*.dll")        {            var result = new List<Type>();            Type attr = inheritType;            string domain = GetBaseDirectory();            string[] dllFiles = Directory.GetFiles(domain, searchpattern, SearchOption.TopDirectoryOnly);            foreach (string dllFileName in dllFiles)            {                foreach (Type type in Assembly.LoadFrom(dllFileName).GetLoadableTypes())                {                    if (type.BaseType == inheritType)                    {                        result.Add(type);                    }                }            }            return result;        }        /// <summary>        /// 扫描程序集找到带有某个Attribute的所有PropertyInfo        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="searchpattern">文件名过滤</param>        /// <returns></returns>        public static Dictionary<PropertyInfo, T> FindAllPropertyByAttribute<T>(string searchpattern = "*.dll") where T : Attribute        {            var result = new Dictionary<PropertyInfo, T>();            var attr = typeof(T);            string domain = GetBaseDirectory();            string[] dllFiles = Directory.GetFiles(domain, searchpattern, SearchOption.TopDirectoryOnly);            foreach (string dllFileName in dllFiles)            {                foreach (Type type in Assembly.LoadFrom(dllFileName).GetLoadableTypes())                {                    foreach (var property in type.GetProperties())                    {                        var attrs = property.GetCustomAttributes(attr, true);                        if (attrs.Length == 0)                            continue;                        result.Add(property, (T)attrs.First());                    }                }            }            return result;        }        /// <summary>        /// 扫描程序集找到类型上带有某个Attribute的所有类型        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="searchpattern">文件名过滤</param>        /// <returns></returns>        public static Dictionary<string, List<T>> FindAllTypeByAttribute<T>(string searchpattern = "*.dll") where T : Attribute        {            var result = new Dictionary<string, List<T>>();            Type attr = typeof(T);            string domain = GetBaseDirectory();            string[] dllFiles = Directory.GetFiles(domain, searchpattern, SearchOption.TopDirectoryOnly);            foreach (string dllFileName in dllFiles)            {                foreach (Type type in Assembly.LoadFrom(dllFileName).GetLoadableTypes())                {                    var typeName = type.AssemblyQualifiedName;                    var attrs = type.GetCustomAttributes(attr, true);                    if (attrs.Length == 0)                        continue;                    result.Add(typeName, new List<T>());                    foreach (T a in attrs)                        result[typeName].Add(a);                }            }            return result;        }        /// <summary>        /// 扫描程序集找到实现了某个接口的第一个实例        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="searchpattern">文件名过滤</param>        /// <returns></returns>        public static T FindTypeByInterface<T>(string searchpattern = "*.dll") where T : class        {                 var interfaceType = typeof(T);            string domain = GetBaseDirectory();            string[] dllFiles = Directory.GetFiles(domain, searchpattern, SearchOption.TopDirectoryOnly);            foreach (string dllFileName in dllFiles)            {                foreach (Type type in Assembly.LoadFrom(dllFileName).GetLoadableTypes())                {                    if (interfaceType != type && interfaceType.IsAssignableFrom(type))                    {                        var instance = Activator.CreateInstance(type) as T;                        return instance;                    }                }            }            return null;        }        public static IEnumerable<Type> GetLoadableTypes(this Assembly assembly)        {            if (assembly == null) throw new ArgumentNullException("assembly");            try            {                return assembly.GetTypes();            }            catch (ReflectionTypeLoadException e)            {                return e.Types.Where(t => t != null);            }        }        /// <summary>        /// 得到当前应用程序的根目录        /// </summary>        /// <returns></returns>        public static string GetBaseDirectory()        {            var baseDirectory = AppDomain.CurrentDomain.SetupInformation.PrivateBinPath;            if (AppDomain.CurrentDomain.SetupInformation.PrivateBinPath == null)                baseDirectory = AppDomain.CurrentDomain.BaseDirectory;            return baseDirectory;        }    }}
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