using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Web;

namespace SuperMap.RealEstate.HighWay.Handler.CommonInterface
{
    public class CommonHelper
    {
        public const string charSet = "1,2,3,4,5,6,7,8,9";

        #region 方法 -> 生成验证码
        /// <summary>    
        /// 生成验证码          
        /// <param name="n">位数</param>   
        /// <returns>验证码字符串</returns>   
        public static string CreateRandomCode(int n)
        {
            string[] CharArray = charSet.Split(',');
            string randomCode = "";
            int temp = -1;
            Random rand = new Random();
            for (int i = 0; i < n; i++)
            {
                if (temp != -1)
                {
                    rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
                }
                int t = rand.Next(CharArray.Length - 1);
                if (temp == t)
                {
                    return CreateRandomCode(n);
                }
                temp = t;
                randomCode += CharArray[t];
            }
            return randomCode;
        }
        #endregion

        #region 方法 -> 获取get,post传参的值
        public static string Request(string key)
        {

            var v = HttpContext.Current.Request.Form[key];

            if (v == null)
            {
                v = HttpContext.Current.Request.QueryString[key];
            }

            return v ?? string.Empty;
        }
        #endregion

        #region 方法 -> 获取DataTable前几条数据
        /// <summary> 
        /// 获取DataTable前几条数据 
        /// </summary> 
        /// <param name="TopItem">前N条数据</param> 
        /// <param name="oDT">源DataTable</param> 
        /// <returns></returns> 
        public static DataTable DtSelectTop(int TopItem, DataTable oDT)
        {
            if (oDT.Rows.Count < TopItem) return oDT;

            DataTable NewTable = oDT.Clone();
            DataRow[] rows = oDT.Select("1=1");
            for (int i = 0; i < TopItem; i++)
            {
                NewTable.ImportRow((DataRow)rows[i]);
            }
            return NewTable;
        }
        #endregion

        #region 对象 -> 通用对象
        /// <summary>
        /// 通用对象
        /// </summary>
        /// <param name="ResultCode">返回结果</param>
        /// <param name="FirstParameter">参数1</param>
        /// <param name="SecondParameter">参数2</param>
        /// <param name="ThirdParameter">参数3</param>
        /// <param name="FourthParameter">参数4</param>
        /// <param name="FifthParameter">参数5</param>
        /// <param name="ResultDesc">备注信息</param>
        public class ResultObject
        {
            /// <summary>
            /// 返回结果
            /// </summary>
            public string ResultCode
            {
                get;
                set;
            }
            /// <summary>
            /// 参数1
            /// </summary>
            public string FirstParameter
            {
                get;
                set;
            }
            /// <summary>
            /// 参数2
            /// </summary>
            public string SecondParameter
            {
                get;
                set;
            }
            /// <summary>
            /// 参数3
            /// </summary>
            public string ThirdParameter
            {
                get;
                set;
            }
            /// <summary>
            /// 参数4
            /// </summary>
            public string FourthParameter
            {
                get;
                set;
            }
            /// <summary>
            /// 参数5
            /// </summary>
            public string FifthParameter
            {
                get;
                set;
            }
            /// <summary>
            /// 参数6
            /// </summary>
            public string SixthParameter
            {
                get;
                set;
            }
            /// <summary>
            /// 参数7
            /// </summary>
            public string SeventhParameter
            {
                get;
                set;
            }
            /// <summary>
            /// 参数8
            /// </summary>
            public string EighthParameter
            {
                get;
                set;
            }
            /// <summary>
            /// 备注
            /// </summary>
            public string ResultDesc
            {
                get;
                set;
            }
        }
        #endregion

        #region 方法 -> 存储图片文件
        public static bool UploadImg(byte[] fileBytes, string FilePath, string FileName)
        {
            bool flag = false;
            try
            {
                string filePath = FilePath + FileName;//图片要保存的路径及文件名
                using (MemoryStream memoryStream = new MemoryStream(fileBytes))//1.定义并实例化一个内存流，以存放提交上来的字节数组。
                {
                    using (FileStream fileUpload = new FileStream(filePath, FileMode.Create))//2.定义实际文件对象，保存上载的文件。
                    {
                        memoryStream.WriteTo(fileUpload); ///3.把内存流里的数据写入物理文件  
                        flag = true;
                    }
                }
            }
            catch (Exception ex)
            {
                SuperMap.RealEstate.Utility.ErrorLogHelper.Write(ex);
            }
            return flag;
        }
        #endregion
    }
}