Excel导出公共函数

     　　/// <summary>
        /// 将一组对象导出成EXCEL
        /// </summary>
        /// <typeparam name="T">要导出对象的类型</typeparam>
        /// <param name="objList">一组对象</param>
        /// <param name="FileName">导出后的文件名</param>
        /// <param name="columnInfo">列名信息</param>
        public void Excel<T>(List<T> objList, string FileName, Dictionary<string, string> columnInfo)
        {
            //生成EXCEL的HTML
            string excelStr = "";
            Type myType = objList[].GetType();
            //根据反射从传递进来的属性名信息得到要显示的属性
            List<System.Reflection.PropertyInfo> myPro = new List<System.Reflection.PropertyInfo>();
            foreach (string cName in columnInfo.Keys)
            {
                System.Reflection.PropertyInfo p = myType.GetProperty(cName);
                if (p != null)
                {
                    myPro.Add(p);
                    excelStr += columnInfo[cName] + "\t";
                }
            }
            //如果没有找到可用的属性则结束
            excelStr += "\n";
            foreach (T obj in objList)
            {
                foreach (System.Reflection.PropertyInfo p in myPro)
                {
                    excelStr += p.GetValue(obj, null) + "\t";
                }
                excelStr += "\n";
            }
            //输出EXCEL
            HttpResponse rs = System.Web.HttpContext.Current.Response;
            rs.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            rs.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8));
            rs.ContentType = "application/ms-excel";
            rs.Write(excelStr);
            rs.End();
        }