数据导出

1.Web层方法

 getNewExcel(export_Infoservice.GetcourseInfoforIPN(start, end), type, "XXXX数据导出", out path, out b);

将所要导出的数据 dt 导出

private void getNewExcel(DataTable dt, string fileName, string type, out string 

filePath, out bool b)
        {
            b = false;
            StringWriter stringWriter = new StringWriter();
            HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);
            DataGrid excel = new DataGrid();
            excel.DataSource = dt.DefaultView;
            //绑定到DataGrid
            excel.DataBind();
            excel.RenderControl(htmlWriter);
            //这里指定文件的路径
            string time = DateTime.Now.ToString("yyyy-MM-dd-hh-mm-ss-ms");
            string fullFileName = fileName + type + "-" + time + ".xls";
            string iisPath = HostingEnvironment.MapPath(@"/Excels/" + 

fullFileName);
            filePath = VCommons.WebConfig.GetWebConfig("ExportData_path", 

"/ExportData/Excels/");
            int pos = iisPath.LastIndexOf("\");
            string files = iisPath.Substring(0, pos);
            if (!Directory.Exists(files))
            {
                Directory.CreateDirectory(files);
            }
            System.IO.StreamWriter sw = new StreamWriter(iisPath, false, 

Encoding.UTF8);
            sw.Write(stringWriter.ToString());
            sw.Close();
            FtpUpload ft = new FtpUpload();
            if (ft.Upload(iisPath, fullFileName, filePath))
            {
                filePath = VCommons.WebConfig.GetWebConfig("website_resource", 

"http://192.168.2.101:807") + filePath + fullFileName;
                FileInfo fileInfo = new FileInfo(iisPath);
                fileInfo.Delete();
                b = true;
            }
        }

GetWebConfig获取webconfig中的参数

public static string GetWebConfig(string strKey, string strDefault)
        {
            if (System.Configuration.ConfigurationManager.AppSettings[strKey] == 

null)
            {
                return strDefault;
            }
            else
            {
                return System.Configuration.ConfigurationManager.AppSettings

[strKey].ToString();
            }
        }

配置Web.config

<configuration>
    <appSettings>
        <add key="ExportData_path" value="/ExportData/Excels/" />
        <add key="website_resource" value="http://192.168.2.101:807" />
    </appSettings>
</configuration>

2.BLL层方法

public DataTable GetcourseInfoforIPN(DateTime start, DateTime end)
        {
            return data.GetcourseInfoforIPN(start, end);
        }

3.DAL层方法
从数据库查找所需数据

public DataTable GetcourseInfoforIPN(DateTime start, DateTime end)
        {
            var linq = from _ClassroomInfo in new 

TsingDa_NewLearningBarRepository<Classroom_Info>(base.UnitWork).GetModel().Where(i 

=> i.AddTime >= start && i.AddTime <= end && i.Status != (int)

ClassroomStatus.Delete && i.Status != 5 && i.Status != 516)
                       join _PlanTask in new CourseManagement_PlanTaskRepository

(base.UnitWork).GetModelExterior()
                        on _ClassroomInfo.ClassroomInfoID equals 

_PlanTask.ClassroomInfoID into _PlanTaskS
                       select new courseInfo
                       {
                           Id = _ClassroomInfo.ClassroomInfoID,
                           userInfoid = _ClassroomInfo.UserInfoID,
                           Title = _ClassroomInfo.Title,
                           Addtime = _ClassroomInfo.AddTime    
                          


                       };
            List<courseInfo> list = linq.ToList();
            DataTable dt = CopyToDataTable(list);
            return dt;
        }

格式转换

public DataTable CopyToDataTable<T>(List<T> array)
        {
            var ret = new DataTable();
            Type type = typeof(T);
            foreach (var item in type.GetProperties())
            {
                DescriptionAttribute descriptAttribute = (DescriptionAttribute)

Attribute.GetCustomAttribute(item, typeof(DescriptionAttribute));
                string columeName = descriptAttribute == null ? item.Name : 

descriptAttribute.Description;
                ret.Columns.Add(columeName, item.PropertyType);
            }

            foreach (T item in array)
            {
                var Row = ret.NewRow();
                foreach (var item2 in type.GetProperties())
                {
                    DescriptionAttribute descriptAttribute = 

(DescriptionAttribute)Attribute.GetCustomAttribute(item2, typeof

(DescriptionAttribute));
                    string columeName = descriptAttribute == null ? item2.Name : 

descriptAttribute.Description;
                    Row[columeName] = item2.GetValue(item);
                }
                ret.Rows.Add(Row);
            }
            return ret;
        }