C# EF ExcelHelper 导入导出

分手后的思念是犯贱 2023-10-18 21:31 12阅读 0赞

//EF导出示例
        var query = from u in orderQuery
        join pro in dbContext.Project on
        u.projectNo equals pro.projectNo
        join org in dbContext.Org on
        u.orgNo equals org.orgNo into JoinedEmpDept
        from dept in JoinedEmpDept.DefaultIfEmpty()
        select new
        {
            学校名称= pro.projectName,
            所属班级=dept.orgName,
            费用类型=u.orderName,
            学生姓名=u.userName,
            身份证号=u.userNo,
            手机号=u.userPhone,
            订单编号=u.orderNo,
            费用金额=u.orderAmount/100.0,
            支付状态=u.payState==1?"已支付":"未支付",
            支付时间=u.payTime,
            银行流水号=u.ccbOrderId,
            添加时间=u.createTime,
            备注=u.remark        
        };
        string fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx";
        string file = localPath + fileName;
        using (ExcelHelper excelHelper = new ExcelHelper(file))
        {
            var list = query.OrderByDescending(u => u.添加时间).ToList();
            excelHelper.ListToExcel(list,"费用");
            return ReturnNode.ReturnSuccess(fileName);
        }

//EF导出示例2，SQL直接导出
    try
    {
        var sql = "SELECT * from user ";
    
       //输出排名
       //sql = string.Format("SELECT @rank :=@rank + 1 AS 排名,A.* FROM ( {0}) A, (SELECT @rank := 0) B;", sql);
    
        string fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx";
        string file = localPath + fileName;
        using (ExcelHelper excelHelper = new ExcelHelper(file))
        {
            System.Data.Common.DbCommand cmd = dbContext.Database.Connection.CreateCommand();
            cmd.CommandText = sql;
            cmd.CommandType = CommandType.Text;
            //转成sqlcommand正常查询语句。
            MySql.Data.MySqlClient.MySqlDataAdapter da = new MySql.Data.MySqlClient.MySqlDataAdapter();
            da.SelectCommand = cmd as MySql.Data.MySqlClient.MySqlCommand;
            DataTable dt = new DataTable();
            da.Fill(dt);
            excelHelper.DataTableToExcel(dt, "用户表",true);
            return ReturnNode.ReturnSuccess(serverPath + fileName);
        }
    }
    catch (Exception ex)
    {
        return ReturnNode.ReturnError(ex.Message);
    }

//导入示例
    string file = "C:\\Data\\模板.xlsx";
    using (ExcelHelper excelHelper = new ExcelHelper(file))
    {
        DataTable dt = excelHelper.ExcelToDataTable("Sheet1", true);
    
        int num = 0;
        for (int i = 0; i < dt.Rows.Count; ++i)
        {
            DataRow row = dt.Rows[i];
            string index = row[0].ToString();
            string orgName = row[1].ToString();
            string orgNo = row[2].ToString();
            string orderName = row[3].ToString();
            string orderAmount = row[4].ToString();
            string userName = row[5].ToString();
            string userNo = row[6].ToString();
            string userPhone = row[7].ToString();
            string remark = row[8].ToString();
    
            
            num++;
        }
    }

using NPOI.HSSF.UserModel;
    using NPOI.SS.UserModel;
    using NPOI.XSSF.UserModel;
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Diagnostics;
    using System.IO;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    
    namespace YFAPICommon.Lib
    {
        class ExcelHelper : IDisposable
        {
            private string fileName = null; //文件名
            private NPOI.SS.UserModel.IWorkbook workbook = null;
            private FileStream fs = null;
            private bool disposed;
    
            public ExcelHelper(string fileName)
            {
                this.fileName = fileName;
                disposed = false;
            }
    
            /// <summary>
            /// 将DataTable数据导入到excel中
            /// </summary>
            /// <param name="data">要导入的数据</param>
            /// <param name="isColumnWritten">DataTable的列名是否要导入</param>
            /// <param name="sheetName">要导入的excel的sheet的名称</param>
            /// <returns>导入数据行数(包含列名那一行)</returns>
            public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)
            {
                int i = 0;
                int j = 0;
                int count = 0;
                ISheet sheet = null;
    
                fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                    workbook = new XSSFWorkbook();
                else if (fileName.IndexOf(".xls") > 0) // 2003版本
                    workbook = new HSSFWorkbook();
    
                try
                {
                    if (workbook != null)
                    {
                        sheet = workbook.CreateSheet(sheetName);
                    }
                    else
                    {
                        return -1;
                    }
    
                    if (isColumnWritten == true) //写入DataTable的列名
                    {
                        IRow row = sheet.CreateRow(0);
                        for (j = 0; j < data.Columns.Count; ++j)
                        {
                            row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
                        }
                        count = 1;
                    }
                    else
                    {
                        count = 0;
                    }
    
                    for (i = 0; i < data.Rows.Count; ++i)
                    {
                        IRow row = sheet.CreateRow(count);
                        for (j = 0; j < data.Columns.Count; ++j)
                        {
                            row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
                        }
                        ++count;
                    }
                    workbook.Write(fs); //写入到excel
                    return count;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Exception: " + ex.Message);
                    return -1;
                }
            }
    
            /// <summary>
            /// 将List数据导入到excel中
            /// </summary>
            /// <param name="data">要导入的数据</param>
            /// <param name="sheetName">要导入的excel的sheet的名称</param>
            /// <returns>导入数据行数(包含列名那一行)</returns>
            public int ListToExcel<T>(List<T> data, string sheetName)
            {
                
                ISheet sheet = null;
    
                fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                    workbook = new XSSFWorkbook();
                else if (fileName.IndexOf(".xls") > 0) // 2003版本
                    workbook = new HSSFWorkbook();
    
                try
                {
                    if (workbook != null)
                    {
                        sheet = workbook.CreateSheet(sheetName);
                    }
                    else
                    {
                        return -1;
                    }
    
    
                    PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
                    IRow row0 = sheet.CreateRow(0);
                    for (int i = 0; i < properties.Count; i++)
                    {
                        PropertyDescriptor property = properties[i];
                        Debug.WriteLine(property.Name);
                        row0.CreateCell(i).SetCellValue(property.Name);
                    }
    
                    int count = 1;
                    object[] values = new object[properties.Count];
                    foreach (T item in data)
                    {
                        IRow row = sheet.CreateRow(count);
                        for (int j = 0; j < values.Length; j++)
                        {
                            object obj = properties[j].GetValue(item);
                            Debug.WriteLine(properties[j].GetValue(item));
                            row.CreateCell(j).SetCellValue(obj==null?"":obj.ToString());
                            
                        }
                        ++count;
                    }
                    workbook.Write(fs); //写入到excel
                    return count;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Exception: " + ex.Message);
                    return -1;
                }
            }
    
            /// <summary>
            /// 将excel中的数据导入到DataTable中
            /// </summary>
            /// <param name="sheetName">excel工作薄sheet的名称</param>
            /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
            /// <returns>返回的DataTable</returns>
            public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn)
            {
                ISheet sheet = null;
                DataTable data = new DataTable();
                int startRow = 0;
                try
                {
                    fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                    if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                        workbook = new XSSFWorkbook(fs);
                    else if (fileName.IndexOf(".xls") > 0) // 2003版本
                        workbook = new HSSFWorkbook(fs);
    
                    if (sheetName != null)
                    {
                        sheet = workbook.GetSheet(sheetName);
                        if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
                        {
                            sheet = workbook.GetSheetAt(0);
                        }
                    }
                    else
                    {
                        sheet = workbook.GetSheetAt(0);
                    }
                    if (sheet != null)
                    {
                        IRow firstRow = sheet.GetRow(0);
                        int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数
    
                        if (isFirstRowColumn)
                        {
                            for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                            {
                                ICell cell = firstRow.GetCell(i);
                                if (cell != null)
                                {
                                    string cellValue = cell.StringCellValue;
                                    if (cellValue != null)
                                    {
                                        DataColumn column = new DataColumn(cellValue);
                                        data.Columns.Add(column);
                                    }
                                }
                            }
                            startRow = sheet.FirstRowNum + 1;
                        }
                        else
                        {
                            startRow = sheet.FirstRowNum;
                        }
    
                        //最后一列的标号
                        int rowCount = sheet.LastRowNum;
                        for (int i = startRow; i <= rowCount; ++i)
                        {
                            IRow row = sheet.GetRow(i);
                            if (row == null)
                                break;
                                //continue; //没有数据的行默认是null　　　　　　　
    
                            DataRow dataRow = data.NewRow();
                            for (int j = row.FirstCellNum; j < cellCount; ++j)
                            {
                                if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
                                    dataRow[j] = row.GetCell(j).ToString();
                            }
                            data.Rows.Add(dataRow);
                        }
                    }
    
                    return data;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Exception: " + ex.Message);
                    //System.Windows.Forms.MessageBox.Show(ex.Message);
                    return null;
                }
            }
    
            internal void ListToExcel(List<object> list, string v)
            {
                throw new NotImplementedException();
            }
    
            public void Dispose()
            {
                Dispose(true);
                GC.SuppressFinalize(this);
            }
    
            protected virtual void Dispose(bool disposing)
            {
                if (!this.disposed)
                {
                    if (disposing)
                    {
                        if (fs != null)
                            fs.Close();
                    }
    
                    fs = null;
                    disposed = true;
                }
            }
        }
    }