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 == -)
            {
                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;
            }
        }

另一个序列化方式为Json.NET

详见：http://json.codeplex.com/

性能比较如下：

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 bool MyWebRequest(string url, bool isPost, IDictionary<string, string> parames, out string serverMsg)
        {
            try
            {
                string param = string.Empty;
                if (parames != null)
                {
                    foreach (var item in parames.Keys)
                    {
                        param += item + "=" + parames[item] + "&";
                    }
                }
                param.TrimEnd('&');
                if (!isPost)
                {
                    url += "?" + param;
                }
                HttpWebRequest webRequest = WebRequest.Create(url) as HttpWebRequest;
                webRequest.Method = isPost ? "Post" : "Get";
                webRequest.KeepAlive = true;
                webRequest.CookieContainer = cookie;
                webRequest.Timeout =  * ;
                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, , bs.Length);
                    }
                }
                using (WebResponse webResponse = webRequest.GetResponse())
                {
                    //string cookieheader = webRequest.CookieContainer.GetCookieHeader(new Uri(url));
                    //cookie.SetCookies(new Uri(url), cookieheader);
                    using (StreamReader responseReader = new StreamReader(webResponse.GetResponseStream()))
                    {
                        serverMsg = responseReader.ReadToEnd();
                        return true;
                    }
                }
            }
            catch (Exception ex)
            {
                serverMsg = ex.Message;
                return false;
            }
        }

//对应的服务端处理
public class Main : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        HttpRequest hr = context.Request;
        //没必要区分是post还是get方式了，直接可以获取相对应的值了
        string name = hr["name"];
        //get方式获取值
        string getName = hr.QueryString["name"];
        //post方式获取值
        string postName = hr.Form["name"];

        context.Response.ContentType = "text/plain";
        context.Response.Write("姓名：" + name + " = " + getName + " = " + postName);
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

        /// <summary>
        /// json数据的Post请求
        /// </summary>
        /// <param name="url">请求的地址</param>
        /// <param name="data">请求的jason参数</param>
        /// <param name="msg">服务器返回的消息或者异常信息</param>
        /// <returns>是否执行成功</returns>
        public static bool JsonPost(string url, string data, out string msg)
        {
            try
            {
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                request.Method = "POST";
                request.ContentType = "application/json";
                using (StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.UTF8))
                {
                    writer.Write(data);
                }
                using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
                {
                    using (Stream responseStream = response.GetResponseStream())
                    {
                        using (StreamReader reader = new StreamReader(responseStream, Encoding.UTF8))
                        {
                            msg = reader.ReadToEnd();
                            return true;
                        }
                    }
                }
            }
            catch (Exception exception)
            {
                msg = exception.Message;
                return false;
            }
        }

//对应的服务端处理
public class Main : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        HttpRequest hr = context.Request;
        string result = string.Empty;
        using (Stream stream = hr.InputStream)
        {
            using (StreamReader sr = new StreamReader(stream))
            {
                result = sr.ReadToEnd();
            }
        }
        //此处对result进行json反序列化即可
        context.Response.ContentType = "text/plain";
        context.Response.Write("客户端发送的整体内容：" + result);
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

        /// <summary>
        /// 上传文件到服务器
        /// </summary>
        /// <param name="url">请求的服务器地址</param>
        /// <param name="uploadFile">要上传的文件本地路径</param>
        /// <param name="msg">服务器返回的消息或者异常信息</param>
        /// <returns>是否执行成功</returns>
        public static bool UploadFile(string url, string uploadFile, out string msg)
        {
            msg = string.Empty;
            try
            {
                using (HttpClient client = new HttpClient())
                {
                    client.Timeout = new TimeSpan(, , );
                    using (FileStream stream = File.OpenRead(uploadFile))
                    {
                        StreamContent content2 = new StreamContent(stream);
                        using (MultipartFormDataContent content = new MultipartFormDataContent())
                        {
                            content.Add(content2, "file", Path.GetFileName(uploadFile));
                            HttpResponseMessage result = client.PostAsync(url, content).Result;
                            msg = result.Content.ReadAsStringAsync().Result;
                            if (result.StatusCode.ToString() == "OK")
                            {
                                return true;
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                msg = ex.Message;
            }
            return false;
        }

//对应的服务端处理
public class Main : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        HttpRequest hr = context.Request;

        HttpFileCollection hfc = hr.Files;
        IList<HttpPostedFile> list = hfc.GetMultiple("file");
        for (int i = ; i < list.Count; i++)
        {
            HttpPostedFile ff = list[i];
　　　　　　　//或者直接这样保存：ff.SaveAs("F:\\" + ff.FileName);
            using (Stream stream = ff.InputStream)
            {
                using (FileStream fs = File.OpenWrite("C:\\infoOver.txt"))
                {
                    byte[] b = new byte[ *  * ];
                    int readlength = ;
                    while ((readlength = stream.Read(b, , b.Length)) > )
                    {
                        fs.Write(b, , readlength);
                    }
                }
            }
        }
        context.Response.ContentType = "text/plain";
        context.Response.Write("文件保存成功");
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}