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  • ExcelHelper.cs

    using System;
    using System.IO;
    using System.Data;
    using System.Collections;
    using System.Data.OleDb;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Reflection;
    
    namespace Comm
    {
        /// <summary>
        /// Excel操作类
        /// </summary>
        /// Microsoft Excel 11.0 Object Library
        public class ExcelHelper
        {
            #region 数据导出至Excel文件
            /// </summary> 
            /// 导出Excel文件,自动返回可下载的文件流 
            /// </summary> 
            public static void DataTable1Excel(System.Data.DataTable dtData)
            {
                GridView gvExport = null;
                HttpContext curContext = HttpContext.Current;
                StringWriter strWriter = null;
                HtmlTextWriter htmlWriter = null;
                if (dtData != null)
                {
                    curContext.Response.ContentType = "application/vnd.ms-excel";
                    curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
                    curContext.Response.Charset = "utf-8";
                    strWriter = new StringWriter();
                    htmlWriter = new HtmlTextWriter(strWriter);
                    gvExport = new GridView();
                    gvExport.DataSource = dtData.DefaultView;
                    gvExport.AllowPaging = false;
                    gvExport.DataBind();
                    gvExport.RenderControl(htmlWriter);
                    curContext.Response.Write("<meta http-equiv="Content-Type" content="text/html;charset=gb2312"/>" + strWriter.ToString());
                    curContext.Response.End();
                }
            }
    
            /// <summary>
            /// 导出Excel文件,转换为可读模式
            /// </summary>
            public static void DataTable2Excel(System.Data.DataTable dtData)
            {
                DataGrid dgExport = null;
                HttpContext curContext = HttpContext.Current;
                StringWriter strWriter = null;
                HtmlTextWriter htmlWriter = null;
    
                if (dtData != null)
                {
                    curContext.Response.ContentType = "application/vnd.ms-excel";
                    curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;
                    curContext.Response.Charset = "";
                    strWriter = new StringWriter();
                    htmlWriter = new HtmlTextWriter(strWriter);
                    dgExport = new DataGrid();
                    dgExport.DataSource = dtData.DefaultView;
                    dgExport.AllowPaging = false;
                    dgExport.DataBind();
                    dgExport.RenderControl(htmlWriter);
                    curContext.Response.Write(strWriter.ToString());
                    curContext.Response.End();
                }
            }
    
            /// <summary>
            /// 导出Excel文件,并自定义文件名
            /// </summary>
            public static void DataTable3Excel(System.Data.DataTable dtData, String FileName)
            {
                GridView dgExport = null;
                HttpContext curContext = HttpContext.Current;
                StringWriter strWriter = null;
                HtmlTextWriter htmlWriter = null;
    
                if (dtData != null)
                {
                    HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);
                    curContext.Response.AddHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls");
                    curContext.Response.ContentType = "application nd.ms-excel";
                    curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;
                    curContext.Response.Charset = "GB2312";
                    strWriter = new StringWriter();
                    htmlWriter = new HtmlTextWriter(strWriter);
                    dgExport = new GridView();
                    dgExport.DataSource = dtData.DefaultView;
                    dgExport.AllowPaging = false;
                    dgExport.DataBind();
                    dgExport.RenderControl(htmlWriter);
                    curContext.Response.Write(strWriter.ToString());
                    curContext.Response.End();
                }
            }
    
    
            public static bool DataSetToExcel(DataSet dataSet, string fileName, bool isShowExcle)
            {
                DataTable dataTable = dataSet.Tables[0];
                int rowNumber = dataTable.Rows.Count;
                int columnNumber = dataTable.Columns.Count;
    
                if (rowNumber == 0)
                {
                    //MessageBox.Show("没有任何数据可以导入到Excel文件!");
                    return false;
                }
    
                //建立Excel对象
                Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
                Microsoft.Office.Interop.Excel.Workbook workBook = excel.Application.Workbooks.Add(true);
                excel.Visible = false;//是否打开该Excel文件
    
                //填充数据
                for (int i = 0; i < rowNumber; i++)
                {
                    for (int j = 0; j < columnNumber; j++)
                    {
                        excel.Cells[i + 1, j + 1] = dataTable.Rows[i].ItemArray[j];
                    }
                }
    
                //string fileName = path + "\" + DateTime.Now.ToString().Replace(':', '_') + ".xls";
                workBook.SaveAs(fileName, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
    
                try
                {
                    workBook.Saved = true;
                    excel.UserControl = false;
                    //excelapp.Quit();
                }
                catch (Exception exception)
                {
                    //MessageBox.Show(exception.Message);
                }
                finally
                {
                    workBook.Close(Microsoft.Office.Interop.Excel.XlSaveAction.xlSaveChanges, Missing.Value, Missing.Value);
                    excel.Quit();
                }
    
                if (isShowExcle)
                {
                    System.Diagnostics.Process.Start(fileName);
                }
                return true;
            }
            /// <summary>
            /// 将数据导出至Excel文件
            /// </summary>
            /// <param name="Table">DataTable对象</param>
            /// <param name="ExcelFilePath">Excel文件路径</param>
            public static bool OutputToExcel(DataTable Table, string ExcelFilePath)
            {
                if (File.Exists(ExcelFilePath))
                {
                    throw new Exception("该文件已经存在!");
                }
    
                if ((Table.TableName.Trim().Length == 0) || (Table.TableName.ToLower() == "table"))
                {
                    Table.TableName = "Sheet1";
                }
    
                //数据表的列数
                int ColCount = Table.Columns.Count;
    
                //用于记数,实例化参数时的序号
                int i = 0;
    
                //创建参数
                OleDbParameter[] para = new OleDbParameter[ColCount];
    
                //创建表结构的SQL语句
                string TableStructStr = @"Create Table " + Table.TableName + "(";
    
                //连接字符串
                string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;";
                OleDbConnection objConn = new OleDbConnection(connString);
    
                //创建表结构
                OleDbCommand objCmd = new OleDbCommand();
    
                //数据类型集合
                ArrayList DataTypeList = new ArrayList();
                DataTypeList.Add("System.Decimal");
                DataTypeList.Add("System.Double");
                DataTypeList.Add("System.Int16");
                DataTypeList.Add("System.Int32");
                DataTypeList.Add("System.Int64");
                DataTypeList.Add("System.Single");
    
                //遍历数据表的所有列,用于创建表结构
                foreach (DataColumn col in Table.Columns)
                {
                    //如果列属于数字列,则设置该列的数据类型为double
                    if (DataTypeList.IndexOf(col.DataType.ToString()) >= 0)
                    {
                        para[i] = new OleDbParameter("@" + col.ColumnName, OleDbType.Double);
                        objCmd.Parameters.Add(para[i]);
    
                        //如果是最后一列
                        if (i + 1 == ColCount)
                        {
                            TableStructStr += col.ColumnName + " double)";
                        }
                        else
                        {
                            TableStructStr += col.ColumnName + " double,";
                        }
                    }
                    else
                    {
                        para[i] = new OleDbParameter("@" + col.ColumnName, OleDbType.VarChar);
                        objCmd.Parameters.Add(para[i]);
    
                        //如果是最后一列
                        if (i + 1 == ColCount)
                        {
                            TableStructStr += col.ColumnName + " varchar)";
                        }
                        else
                        {
                            TableStructStr += col.ColumnName + " varchar,";
                        }
                    }
                    i++;
                }
    
                //创建Excel文件及文件结构
                try
                {
                    objCmd.Connection = objConn;
                    objCmd.CommandText = TableStructStr;
    
                    if (objConn.State == ConnectionState.Closed)
                    {
                        objConn.Open();
                    }
                    objCmd.ExecuteNonQuery();
                }
                catch (Exception exp)
                {
                    throw exp;
                }
    
                //插入记录的SQL语句
                string InsertSql_1 = "Insert into " + Table.TableName + " (";
                string InsertSql_2 = " Values (";
                string InsertSql = "";
    
                //遍历所有列,用于插入记录,在此创建插入记录的SQL语句
                for (int colID = 0; colID < ColCount; colID++)
                {
                    if (colID + 1 == ColCount)  //最后一列
                    {
                        InsertSql_1 += Table.Columns[colID].ColumnName + ")";
                        InsertSql_2 += "@" + Table.Columns[colID].ColumnName + ")";
                    }
                    else
                    {
                        InsertSql_1 += Table.Columns[colID].ColumnName + ",";
                        InsertSql_2 += "@" + Table.Columns[colID].ColumnName + ",";
                    }
                }
    
                InsertSql = InsertSql_1 + InsertSql_2;
    
                //遍历数据表的所有数据行
                for (int rowID = 0; rowID < Table.Rows.Count; rowID++)
                {
                    for (int colID = 0; colID < ColCount; colID++)
                    {
                        if (para[colID].DbType == DbType.Double && Table.Rows[rowID][colID].ToString().Trim() == "")
                        {
                            para[colID].Value = 0;
                        }
                        else
                        {
                            para[colID].Value = Table.Rows[rowID][colID].ToString().Trim();
                        }
                    }
                    try
                    {
                        objCmd.CommandText = InsertSql;
                        objCmd.ExecuteNonQuery();
                    }
                    catch (Exception exp)
                    {
                        string str = exp.Message;
                    }
                }
                try
                {
                    if (objConn.State == ConnectionState.Open)
                    {
                        objConn.Close();
                    }
                }
                catch (Exception exp)
                {
                    throw exp;
                }
                return true;
            }
    
            /// <summary>
            /// 将数据导出至Excel文件
            /// </summary>
            /// <param name="Table">DataTable对象</param>
            /// <param name="Columns">要导出的数据列集合</param>
            /// <param name="ExcelFilePath">Excel文件路径</param>
            public static bool OutputToExcel(DataTable Table, ArrayList Columns, string ExcelFilePath)
            {
                if (File.Exists(ExcelFilePath))
                {
                    throw new Exception("该文件已经存在!");
                }
    
                //如果数据列数大于表的列数,取数据表的所有列
                if (Columns.Count > Table.Columns.Count)
                {
                    for (int s = Table.Columns.Count + 1; s <= Columns.Count; s++)
                    {
                        Columns.RemoveAt(s);   //移除数据表列数后的所有列
                    }
                }
    
                //遍历所有的数据列,如果有数据列的数据类型不是 DataColumn,则将它移除
                DataColumn column = new DataColumn();
                for (int j = 0; j < Columns.Count; j++)
                {
                    try
                    {
                        column = (DataColumn)Columns[j];
                    }
                    catch (Exception)
                    {
                        Columns.RemoveAt(j);
                    }
                }
                if ((Table.TableName.Trim().Length == 0) || (Table.TableName.ToLower() == "table"))
                {
                    Table.TableName = "Sheet1";
                }
    
                //数据表的列数
                int ColCount = Columns.Count;
    
                //创建参数
                OleDbParameter[] para = new OleDbParameter[ColCount];
    
                //创建表结构的SQL语句
                string TableStructStr = @"Create Table " + Table.TableName + "(";
    
                //连接字符串
                string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;";
                OleDbConnection objConn = new OleDbConnection(connString);
    
                //创建表结构
                OleDbCommand objCmd = new OleDbCommand();
    
                //数据类型集合
                ArrayList DataTypeList = new ArrayList();
                DataTypeList.Add("System.Decimal");
                DataTypeList.Add("System.Double");
                DataTypeList.Add("System.Int16");
                DataTypeList.Add("System.Int32");
                DataTypeList.Add("System.Int64");
                DataTypeList.Add("System.Single");
    
                DataColumn col = new DataColumn();
    
                //遍历数据表的所有列,用于创建表结构
                for (int k = 0; k < ColCount; k++)
                {
                    col = (DataColumn)Columns[k];
    
                    //列的数据类型是数字型
                    if (DataTypeList.IndexOf(col.DataType.ToString().Trim()) >= 0)
                    {
                        para[k] = new OleDbParameter("@" + col.Caption.Trim(), OleDbType.Double);
                        objCmd.Parameters.Add(para[k]);
    
                        //如果是最后一列
                        if (k + 1 == ColCount)
                        {
                            TableStructStr += col.Caption.Trim() + " Double)";
                        }
                        else
                        {
                            TableStructStr += col.Caption.Trim() + " Double,";
                        }
                    }
                    else
                    {
                        para[k] = new OleDbParameter("@" + col.Caption.Trim(), OleDbType.VarChar);
                        objCmd.Parameters.Add(para[k]);
    
                        //如果是最后一列
                        if (k + 1 == ColCount)
                        {
                            TableStructStr += col.Caption.Trim() + " VarChar)";
                        }
                        else
                        {
                            TableStructStr += col.Caption.Trim() + " VarChar,";
                        }
                    }
                }
    
                //创建Excel文件及文件结构
                try
                {
                    objCmd.Connection = objConn;
                    objCmd.CommandText = TableStructStr;
    
                    if (objConn.State == ConnectionState.Closed)
                    {
                        objConn.Open();
                    }
                    objCmd.ExecuteNonQuery();
                }
                catch (Exception exp)
                {
                    throw exp;
                }
    
                //插入记录的SQL语句
                string InsertSql_1 = "Insert into " + Table.TableName + " (";
                string InsertSql_2 = " Values (";
                string InsertSql = "";
    
                //遍历所有列,用于插入记录,在此创建插入记录的SQL语句
                for (int colID = 0; colID < ColCount; colID++)
                {
                    if (colID + 1 == ColCount)  //最后一列
                    {
                        InsertSql_1 += Columns[colID].ToString().Trim() + ")";
                        InsertSql_2 += "@" + Columns[colID].ToString().Trim() + ")";
                    }
                    else
                    {
                        InsertSql_1 += Columns[colID].ToString().Trim() + ",";
                        InsertSql_2 += "@" + Columns[colID].ToString().Trim() + ",";
                    }
                }
    
                InsertSql = InsertSql_1 + InsertSql_2;
    
                //遍历数据表的所有数据行
                DataColumn DataCol = new DataColumn();
                for (int rowID = 0; rowID < Table.Rows.Count; rowID++)
                {
                    for (int colID = 0; colID < ColCount; colID++)
                    {
                        //因为列不连续,所以在取得单元格时不能用行列编号,列需得用列的名称
                        DataCol = (DataColumn)Columns[colID];
                        if (para[colID].DbType == DbType.Double && Table.Rows[rowID][DataCol.Caption].ToString().Trim() == "")
                        {
                            para[colID].Value = 0;
                        }
                        else
                        {
                            para[colID].Value = Table.Rows[rowID][DataCol.Caption].ToString().Trim();
                        }
                    }
                    try
                    {
                        objCmd.CommandText = InsertSql;
                        objCmd.ExecuteNonQuery();
                    }
                    catch (Exception exp)
                    {
                        string str = exp.Message;
                    }
                }
                try
                {
                    if (objConn.State == ConnectionState.Open)
                    {
                        objConn.Close();
                    }
                }
                catch (Exception exp)
                {
                    throw exp;
                }
                return true;
            }
            #endregion
        }
    }
    

      

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  • 原文地址:https://www.cnblogs.com/huxiaolin/p/4488613.html
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