C#帮助类

1、集合操作

        // <summary>
        /// 判断一个集合是否包含某个值
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="list"></param>
        /// <param name="value"></param>
        /// <returns>返回索引值</returns>
        public static int IsContainValue<T>(IEnumerable<T> list, T value)
        {
            return list.ToList<T>().FindIndex(i => i.Equals(value));
        }

2、反射

        /// <summary>
        ///  实例化反射对象
        /// </summary>
        /// <param name="t">如果类型为null，就根据对象获取类型</param>
        /// <param name="obj">如果对象为null，就根据类型实例化对象</param>
        static void JudgeType(ref Type t, ref object obj, ref BindingFlags flags, bool isPublic, bool isStatic)
        {
            if (t != null)
            {
                obj = Activator.CreateInstance(t);
            }
            else
            {
                t = obj.GetType();
            }
            flags = (isStatic ? BindingFlags.Static : BindingFlags.Instance) | (isPublic ? BindingFlags.Public : BindingFlags.NonPublic);
        }

        /// <summary>
        /// 获取对象的属性或者字段的值
        /// </summary>
        /// <param name="t">如果类型为null，就根据对象获取类型</param>
        /// <param name="obj">如果对象为null，就根据类型实例化对象</param>
        /// <param name="name">属性或者字段的名称</param>
        /// <param name="isPublic">是否是public修饰符修饰的</param>
        /// <param name="isStatic">是否是静态的</param>
        /// <returns>返回字段或者属性的值</returns>
        public static object GetFieldOrProperty(Type t, object obj, string name, bool isPublic, bool isStatic)
        {
            BindingFlags flags = BindingFlags.Default;
            JudgeType(ref t, ref  obj, ref flags, isPublic, isStatic);
            FieldInfo fieldInfo = t.GetField(name, flags);
            if (fieldInfo == null)
            {
                PropertyInfo propertyInfo = t.GetProperty(name, flags);
                if (propertyInfo != null)
                {
                    return propertyInfo.GetValue(obj, null);
                }
                return null;
            }
            return fieldInfo.GetValue(obj);
        }

        /// <summary>
        /// 反射执行对象的方法
        /// </summary>
        /// <param name="t">如果类型为null，就根据对象获取类型</param>
        /// <param name="obj">如果对象为null，就根据类型实例化对象</param>
        /// <param name="methodName">方法名称</param>
        /// <param name="parameters">方法参数</param>
        /// <param name="isPublic">是否是public修饰符修饰的</param>
        /// <param name="isStatic">是否是静态的</param>
        public static void ExecuteMethod(Type t, object obj, string methodName, object[] parameters, bool isPublic, bool isStatic)
        {
            BindingFlags flags = BindingFlags.Default;
            JudgeType(ref t, ref obj, ref flags, isPublic, isStatic);
            MethodInfo methodInfo = t.GetMethod(methodName, flags);
            if (methodInfo != null)
            {
                methodInfo.Invoke(obj, parameters);
            }
        }

        /// <summary>
        /// 得到属性或者字段或者方法的特性
        /// </summary>
        /// <param name="t">如果类型为null，就根据对象获取类型</param>
        /// <param name="obj">如果对象为null，就根据类型实例化对象</param>
        /// <param name="name">名称</param>
        /// <param name="isPublic">是否是public修饰符修饰的</param>
        /// <param name="isStatic">是否是静态的</param>
        /// <returns></returns>
        public static object[] GetCustomAttributes(Type t, object obj, string name, bool isPublic, bool isStatic)
        {
            BindingFlags flags = BindingFlags.Default;
            JudgeType(ref t, ref obj, ref flags, isPublic, isStatic);
            MethodInfo methodInfo = t.GetMethod(name, flags);
            if (methodInfo != null)
            {
                return methodInfo.GetCustomAttributes(false);
            }
            else
            {
                FieldInfo fieldInfo = t.GetField(name, flags);
                if (fieldInfo != null)
                {
                    return fieldInfo.GetCustomAttributes(false);
                }
                else
                {
                    PropertyInfo propertyInfo = t.GetProperty(name, flags);
                    if (propertyInfo != null)
                    {
                        return propertyInfo.GetCustomAttributes(false);
                    }
                    return null;
                }
            }
        }

        /// <summary>
        /// 加载程序集，并实例化对象
        /// </summary>
        /// <param name="dllPath">程序集路径（绝对路径）</param>
        /// <param name="index">为-1，表示要实例化所有对象，不为-1，表示要实例化索引为index的对象</param>
        /// <param name="objList">输出实例化的对象</param>
        /// <returns>返回所有类型</returns>
        public static Type[] GetTypes(string dllPath, int index, ref List<object> objList)
        {
            objList = new List<object>();
            Type[] t;
            object obj;
            Assembly assembly = Assembly.LoadFile(dllPath);
            t = assembly.GetTypes();
            if (index == -1)
            {
                foreach (var item in t)
                {
                    obj = Activator.CreateInstance(item);
                    objList.Add(obj);
                }
            }
            else
            {
                obj = Activator.CreateInstance(t[index]);
                objList.Add(obj);
            }
            return t;
        }

3、序列化

        // JavaScriptSerializer在net3.5中已被标记“过时”,使用这个类，必须引用System.Web.Extensions.dll
        // 新的序列化类“DataContractJsonSerializer”，使用DataContract和DataMember特性来分别标记你要序列化的对象和成员
        // 如果不想序列化某个成员，就标记为 [IgnoreDataMember]
        // 你可以在DataMember属性里用"Name"参数指定名称，例子如下：
        // [DataMember(Name = "First")]
        // public string FirstName { get; set; }
        // 序列化后的结果：{"First":"Chris","LastName":"Pietschmann"} 

        /// <summary>
        /// 序列化，需要引用System.Runtime.Serialization和System.ServiceModel.Web
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string Serialize<T>(T obj)
        {
            using (MemoryStream stream = new MemoryStream())
            {
                string result = string.Empty;
                DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
                serializer.WriteObject(stream, obj);
                result = Convert.ToBase64String(stream.ToArray(), Base64FormattingOptions.None);
                return result;
            }
        }

        /// <summary>
        /// 反序列化
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="str"></param>
        /// <returns></returns>
        public static T Deserialize<T>(string str)
        {
            //T obj = Activator.CreateInstance<T>();
            using (MemoryStream stream = new MemoryStream(Convert.FromBase64String(str)))
            {
                DataContractJsonSerializer deserialize = new DataContractJsonSerializer(typeof(T));
                var obj = (T)deserialize.ReadObject(stream);
                return obj;
            }
        }

4、网页

        /// <summary>
        /// 获取网页源文件
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string GetWebContent(string url)
        {
            System.Net.WebClient wc = new System.Net.WebClient();
            wc.Credentials = System.Net.CredentialCache.DefaultCredentials;
            return wc.DownloadString(url);
        }

        /// <summary>
        ///  向网页发送Post或者Get请求
        /// </summary>
        private static CookieContainer cookie = new CookieContainer();// 主要是设置session值
        public static string WebRequest(string url, bool isPost, IDictionary<string, string> parames)
        {
            HttpWebRequest webRequest = null;
            string param = string.Empty;
            foreach (var item in parames.Keys)
            {
                param += item + "=" + parames[item] + "&";
            }
            param.TrimEnd(‘&‘);
            if (!isPost)
                url += "?" + param;
            webRequest = System.Net.WebRequest.Create(url) as HttpWebRequest;
            webRequest.Method = isPost ? "Post" : "Get";
            webRequest.KeepAlive = true;
            webRequest.CookieContainer = cookie;
            webRequest.Timeout = 1000 * 60;
            webRequest.ContentType = "application/x-www-form-urlencoded";
            if (isPost)
            {
                byte[] bs = Encoding.UTF8.GetBytes(param);
                webRequest.ContentLength = bs.Length;
                using (Stream requestWriter = webRequest.GetRequestStream())
                {
                    requestWriter.Write(bs, 0, bs.Length);
                }
            }
            WebResponse webResponse = webRequest.GetResponse();
            //string cookieheader = webRequest.CookieContainer.GetCookieHeader(new Uri(url));
            //cookie.SetCookies(new Uri(url), cookieheader);
            string responseData = string.Empty;
            using (StreamReader responseReader = new StreamReader(webResponse.GetResponseStream()))
            {
                responseData = responseReader.ReadToEnd();
            }
            return responseData;
        }