datagridview与excel文件的导入导出

你导出的有些问题，用这个，我测试过：
  public static void DataGridViewToExcel(DataGridView dgv)
        {
            #region   验证可操作性            //申明保存对话框
            SaveFileDialog dlg = new SaveFileDialog();
            //默然文件后缀
            dlg.DefaultExt = "xls ";
            //文件后缀列表
            dlg.Filter = "EXCEL文件(*.XLS)|*.xls ";
            //默然路径是系统当前路径
            dlg.InitialDirectory = Directory.GetCurrentDirectory();
            //打开保存对话框
            if (dlg.ShowDialog() == DialogResult.Cancel) return;
            //返回文件路径
            string fileNameString = dlg.FileName;
            //验证strFileName是否为空或值无效
            if (fileNameString.Trim() == " ")
            { return; }
            //定义表格内数据的行数和列数
            int rowscount = dgv.Rows.Count;
            int colscount = dgv.Columns.Count;
            //行数必须大于0
            if (rowscount <= 0)
            {
                MessageBox.Show("没有数据可供保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }            //列数必须大于0
            if (colscount <= 0)
            {
                MessageBox.Show("没有数据可供保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }            //行数不可以大于65536
            if (rowscount > 65536)
            {
                MessageBox.Show("数据记录数太多(最多不能超过65536条)，不能保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }            //列数不可以大于255
            if (colscount > 255)
            {
                MessageBox.Show("数据记录行数太多，不能保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }            //验证以fileNameString命名的文件是否存在，如果存在删除它
            FileInfo file = new FileInfo(fileNameString);
            if (file.Exists)
            {
                try
                {
                    file.Delete();
                }
                catch (Exception error)
                {
                    MessageBox.Show(error.Message, "删除失败 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    return;
                }
            }
            #endregion
            Microsoft.Office.Interop.Excel.Application objExcel = null;
            Microsoft.Office.Interop.Excel.Workbook objWorkbook = null;
            Microsoft.Office.Interop.Excel.Worksheet objsheet = null;
            try
            {
                //申明对象
                objExcel = new Microsoft.Office.Interop.Excel.Application();
                objWorkbook = objExcel.Workbooks.Add(Missing.Value);
                objsheet = (Microsoft.Office.Interop.Excel.Worksheet)objWorkbook.ActiveSheet;
                //设置EXCEL不可见
                objExcel.Visible = false;                //向Excel中写入表格的表头
                int displayColumnsCount = 1;
                for (int i = 0; i <= dgv.ColumnCount - 1; i++)
                {
                    if (dgv.Columns[i].Visible == true)
                    {
                        objExcel.Cells[1, displayColumnsCount] = dgv.Columns[i].HeaderText.Trim();
                        displayColumnsCount++;
                    }
                }
                //设置进度条
                //tempProgressBar.Refresh();
                //tempProgressBar.Visible   =   true;
                //tempProgressBar.Minimum=1;
                //tempProgressBar.Maximum=dgv.RowCount;
                //tempProgressBar.Step=1;
                //向Excel中逐行逐列写入表格中的数据
                for (int row = 0; row <= dgv.RowCount - 1; row++)
                {
                    //tempProgressBar.PerformStep();                       displayColumnsCount = 1;
                    for (int col = 0; col < colscount; col++)
                    {
                        if (dgv.Columns[col].Visible == true)
                        {
                            try
                            {
                                objExcel.Cells[row + 2, displayColumnsCount] = dgv.Rows[row].Cells[col].Value.ToString().Trim();
                                displayColumnsCount++;
                            }
                            catch (Exception)
                            {                            }                        }
                    }
                }
                //隐藏进度条
                //tempProgressBar.Visible   =   false;
                //保存文件
                objWorkbook.SaveAs(fileNameString, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
                        Missing.Value, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlShared, Missing.Value, Missing.Value, Missing.Value,
                        Missing.Value, Missing.Value);
            }
            catch (Exception error)
            {
                MessageBox.Show(error.Message, "警告 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            finally
            {
                //关闭Excel应用
                if (objWorkbook != null) objWorkbook.Close(Missing.Value, Missing.Value, Missing.Value);
                if (objExcel.Workbooks != null) objExcel.Workbooks.Close();
                if (objExcel != null) objExcel.Quit();                objsheet = null;
                objWorkbook = null;
                objExcel = null;
            }
            MessageBox.Show(fileNameString + "\n\n导出完毕! ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);        }

还是老问题，我们的方法导出都是csv文件，后缀被改成了xls。用xls打开会有提示。导出的csv文件再用原来导入的方法会有问题，在conn.open();那行。csv文件导入到datagridview中方法，我不会啊求大神指教。下面是代码，有错的。 string ConnectionString;
                string SQLString;
                ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+path+";Extended Properties=\"Text;HDR=yes;FMT=Delimited\""; //注意是文件所在的文件夹，不是文件本身路径
                SQLString = "Select * from 7.csv";
                System.Data.OleDb.OleDbConnection ConnectionText = new System.Data.OleDb.OleDbConnection();
                ConnectionText.ConnectionString = ConnectionString;
                ConnectionText.Open();
                System.Data.OleDb.OleDbDataAdapter AdapterText = new System.Data.OleDb.OleDbDataAdapter(SQLString, ConnectionText);
                System.Data.DataSet DataSetText = new System.Data.DataSet("TextFiles");
                AdapterText.Fill(DataSetText, "TextFile");
                                DataTable tb = new DataTable();
                foreach (DataGridViewColumn dgvc in dgv.Columns)
                {
                    if (dgvc.Visible && dgvc.CellType != typeof(DataGridViewCheckBoxCell))
                    {
                        DataColumn dc = new DataColumn();
                        dc.ColumnName = dgvc.DataPropertyName;
                        //dc.DataType = dgvc.ValueType;//若需要限制导入时的数据类型则取消注释，前提是DataGridView必须先绑定一个数据源那怕是空的DataTable
                        tb.Columns.Add(dc);
                    }
                }
               DataSet ds = new DataSet();
               ds = (DataSet)dgv.DataSource;
                //根据Excel的行逐一对上面构造的DataTable的列进行赋值
                foreach (DataRow excelRow in ds.Tables[0].Rows)
                {
                    int i = 0;
                    DataRow dr = tb.NewRow();
                    foreach (DataColumn dc in tb.Columns)
                    {
                        dr[dc] = excelRow[i];
                        i++;
                    }
                    tb.Rows.Add(dr);
                }
                //在DataGridView中显示导入的数据
                dgv.Columns.Clear();
                dgv.DataSource = tb;

用这个方式导入，如何？
  private void button4_Click(object sender, EventArgs e)
        {            dgv.DataSource = newOpenCSV("d:\\7.csv");
        }
        public DataTable newOpenCSV(string filePath)
        {
            //Encoding encoding = Common.GetType(filePath); //Encoding.ASCII;//
            DataTable dt = new DataTable();
            FileStream fs = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);            StreamReader sr = new StreamReader(fs, Encoding.Default);
            //StreamReader sr = new StreamReader(fs, encoding);
            //string fileContent = sr.ReadToEnd();
            //encoding = sr.CurrentEncoding;
            //记录每次读取的一行记录
            string strLine = "";
            //记录每行记录中的各字段内容
            string[] aryLine = null;
            string[] tableHead = null;
            //标示列数
            int columnCount = 0;
            //标示是否是读取的第一行
            bool IsFirst = true;
            //逐行读取CSV中的数据
            while ((strLine = sr.ReadLine()) != null)
            {
                //strLine = Common.ConvertStringUTF8(strLine, encoding);
                //strLine = Common.ConvertStringUTF8(strLine);                if (IsFirst == true)
                {
                    tableHead = strLine.Split(',');
                    IsFirst = false;
                    columnCount = tableHead.Length;
                    //创建列
                    for (int i = 0; i < columnCount; i++)
                    {
                        DataColumn dc = new DataColumn(tableHead[i]);
                        dt.Columns.Add(dc);
                    }
                }
                else
                {
                    aryLine = strLine.Split(',');
                    DataRow dr = dt.NewRow();
                    for (int j = 0; j < columnCount; j++)
                    {
                        dr[j] = aryLine[j];
                    }
                    dt.Rows.Add(dr);
                }
            }
            if (aryLine != null && aryLine.Length > 0)
            {
                dt.DefaultView.Sort = tableHead[0] + " " + "asc";
            }            sr.Close();
            fs.Close();
            return dt;
        }

你这个导入要重新修改数据吗？如果不用，下面代码就可，去了当中的代码。
  string ConnectionString;
            string SQLString;
            ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + ";Extended Properties=\"Text;HDR=yes;FMT=Delimited\""; //注意是文件所在的文件夹，不是文件本身路径
            SQLString = "Select * from 8.csv";
            System.Data.OleDb.OleDbConnection ConnectionText = new System.Data.OleDb.OleDbConnection();
            ConnectionText.ConnectionString = ConnectionString;
            ConnectionText.Open();
            System.Data.OleDb.OleDbDataAdapter AdapterText = new System.Data.OleDb.OleDbDataAdapter(SQLString, ConnectionText);
            System.Data.DataSet DataSetText = new System.Data.DataSet("TextFiles");
            AdapterText.Fill(DataSetText, "TextFile");
            dgv.DataSource = DataSetText.Tables[0].DefaultView;

你的path是路径,如果7.csv是放在d:\,那么string path=@"D:\";

运行到dr[j] = aryLine[j];出错。索引超出了数组界限。

这个是else里，不从第一行读取，你可以不用else里的代码，看一下，注释了

导入原始excel文件的结果是这样用5楼方法保存，再用9楼方法导入是这样

我知道了，你保存是EXCEL，我这个是读取是CSV，不一样，

恩保存的是excel，但实际上是csv文件。所以再用1楼导入excel方法导入就出错了。

8楼9楼导入结果是一样的，只需要删掉前面的13列即可（datagridview设置原始是13列）。
但是结果每一行的数据都到一列上去了。
是不是strLine.Split(',');得改成“空格”分割，因为我用记事本打开看是列与列的数据之间是空格。

导入方法
        /// <summary>
        /// excel数据导入datagridview方法
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="dgv"></param>
        public void ExcelToDataGridView(string filePath, DataGridView dgv)
        {
            if (filePath.Contains(".xls"))
            {
                //根据路径打开一个Excel文件并将数据填充到DataSet中
                string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = " + filePath + ";Extended Properties ='Excel 8.0;HDR=NO;IMEX=1'";//HDR=YES 有两个值:YES/NO,表示第一行是否字段名,默认是YES,第一行是字段名
                OleDbConnection conn = new OleDbConnection(strConn);
                conn.Open();
                string strExcel = "";
                OleDbDataAdapter myCommand = null;
                DataSet ds = null;
                strExcel = "select  * from   [sheet1$]";
                myCommand = new OleDbDataAdapter(strExcel, strConn);
                ds = new DataSet();
                myCommand.Fill(ds, "table1");                //根据DataGridView的列构造一个新的DataTable
                DataTable tb = new DataTable();
                foreach (DataGridViewColumn dgvc in dgv.Columns)
                {
                    if (dgvc.Visible && dgvc.CellType != typeof(DataGridViewCheckBoxCell))
                    {
                        DataColumn dc = new DataColumn();
                        dc.ColumnName = dgvc.DataPropertyName;
                        //dc.DataType = dgvc.ValueType;//若需要限制导入时的数据类型则取消注释，前提是DataGridView必须先绑定一个数据源那怕是空的DataTable
                        tb.Columns.Add(dc);
                    }
                }                //根据Excel的行逐一对上面构造的DataTable的列进行赋值
                foreach (DataRow excelRow in ds.Tables[0].Rows)
                {
                    int i = 0;
                    DataRow dr = tb.NewRow();
                    foreach (DataColumn dc in tb.Columns)
                    {
                        dr[dc] = excelRow[i];
                        i++;
                    }
                    tb.Rows.Add(dr);
                }
                //在DataGridView中显示导入的数据
                dgv.Columns.Clear();
                dgv.DataSource = tb;
            }            if (filePath.Contains(".csv"))
            {
                string ConnectionString;
                string SQLString;
                ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + ";Extended Properties=\"Text;HDR=yes;FMT=Delimited\""; //注意是文件所在的文件夹，不是文件本身路径
                SQLString = "Select * from 7.csv";
                System.Data.OleDb.OleDbConnection ConnectionText = new System.Data.OleDb.OleDbConnection();
                ConnectionText.ConnectionString = ConnectionString;
                ConnectionText.Open();
                System.Data.OleDb.OleDbDataAdapter AdapterText = new System.Data.OleDb.OleDbDataAdapter(SQLString, ConnectionText);
                System.Data.DataSet DataSetText = new System.Data.DataSet("TextFiles");
                AdapterText.Fill(DataSetText, "TextFile");
                dgv.DataSource = DataSetText.Tables[0].DefaultView;


           }
        }


       /// 导入button
       /// </summary>
       /// <param name="sender"></param>
       /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            //打开一个文件选择框
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Title = "导入数据";
            ofd.FileName = "";
            ofd.InitialDirectory = path;//ofd.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);为了获取特定的系统文件夹，可以使用System.Environment类的静态方法GetFolderPath()。该方法接受一个Environment.SpecialFolder枚举，其中可以定义要返回路径的哪个系统目录
            ofd.Filter = "Excel文件(*.xls)|*.xls|csv文件(*.csv)|*.csv";
            ofd.ValidateNames = true;     //文件有效性验证ValidateNames，验证用户输入是否是一个有效的Windows文件名
            ofd.CheckFileExists = true;  //验证路径有效性
            ofd.CheckPathExists = true; //验证文件有效性
            string strName = string.Empty;
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                strName = ofd.FileName;
            }            if (strName == "")
            {
                MessageBox.Show("没有选择Excel文件！无法进行数据导入");
                return;
            }
            ExcelToDataGridView(strName, this.dataGridView1); //Excel写错？            //不可列排序
            for (int i = 0; i < dataGridView1.Columns.Count; i++)
            {
                dataGridView1.Columns[i].SortMode = DataGridViewColumnSortMode.NotSortable;
            }

        }

保存方法 /// <summary>
        /// 保存button
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {

                DataGridViewToExcel(this.dataGridView1);
               }
        public static void DataGridViewToExcel(DataGridView dgv)
        {
            #region   验证可操作性            //申明保存对话框
            SaveFileDialog dlg = new SaveFileDialog();
            //默然文件后缀
            dlg.DefaultExt = "xls ";
            //文件后缀列表
            dlg.Filter = "EXCEL文件(*.csv)|*.csv";
            //默然路径是系统当前路径
            dlg.InitialDirectory = Directory.GetCurrentDirectory();
            //打开保存对话框
            if (dlg.ShowDialog() == DialogResult.Cancel) return;
            //返回文件路径
            string fileNameString = dlg.FileName;
            //验证strFileName是否为空或值无效
            if (fileNameString.Trim() == " ")
            { return; }
            //定义表格内数据的行数和列数
            int rowscount = dgv.Rows.Count;
            int colscount = dgv.Columns.Count;
            //行数必须大于0
            if (rowscount <= 0)
            {
                MessageBox.Show("没有数据可供保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }            //列数必须大于0
            if (colscount <= 0)
            {
                MessageBox.Show("没有数据可供保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }            //行数不可以大于65536
            if (rowscount > 65536)
            {
                MessageBox.Show("数据记录数太多(最多不能超过65536条)，不能保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }            //列数不可以大于255
            if (colscount > 255)
            {
                MessageBox.Show("数据记录行数太多，不能保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }            //验证以fileNameString命名的文件是否存在，如果存在删除它
            FileInfo file = new FileInfo(fileNameString);
            if (file.Exists)
            {
                try
                {
                    file.Delete();
                }
                catch (Exception error)
                {
                    MessageBox.Show(error.Message, "删除失败 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    return;
                }
            }
            #endregion
            object oMis = System.Reflection.Missing.Value;
            Microsoft.Office.Interop.Excel.Application objExcel = null;
            Microsoft.Office.Interop.Excel.Workbook objWorkbook = null;
            Microsoft.Office.Interop.Excel.Worksheet objsheet = null;
            try
            {
                //申明对象
                objExcel = new Microsoft.Office.Interop.Excel.Application();
                objWorkbook = objExcel.Workbooks.Add(oMis);
                objsheet = (Microsoft.Office.Interop.Excel.Worksheet)objWorkbook.ActiveSheet;
                //设置EXCEL不可见
                objExcel.Visible = false;                //向Excel中写入表格的表头
                int displayColumnsCount = 1;
                for (int i = 0; i <= dgv.ColumnCount - 1; i++)
                {
                    if (dgv.Columns[i].Visible == true)
                    {
                        objExcel.Cells[1, displayColumnsCount] = dgv.Columns[i].HeaderText.Trim();
                        displayColumnsCount++;
                    }
                }
                //设置进度条
                //tempProgressBar.Refresh();
                //tempProgressBar.Visible   =   true;
                //tempProgressBar.Minimum=1;
                //tempProgressBar.Maximum=dgv.RowCount;
                //tempProgressBar.Step=1;
                //向Excel中逐行逐列写入表格中的数据
                for (int row = 0; row <= dgv.RowCount - 1; row++)
                {
                    //tempProgressBar.PerformStep();                       displayColumnsCount = 1;
                    for (int col = 0; col < colscount; col++)
                    {
                        if (dgv.Columns[col].Visible == true)
                        {
                            try
                            {
                                objExcel.Cells[row + 2, displayColumnsCount] = dgv.Rows[row].Cells[col].Value.ToString().Trim();
                                displayColumnsCount++;
                            }
                            catch (Exception)
                            {                            }                        }
                    }
                }
                //隐藏进度条
                //tempProgressBar.Visible   =   false;
                //保存文件
                objWorkbook.SaveAs(fileNameString, oMis, oMis, oMis, oMis,
                        oMis, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlShared, oMis, oMis, oMis,
                        oMis, oMis);
            }
            catch (Exception error)
            {
                MessageBox.Show(error.Message, "警告 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            finally
            {
                //关闭Excel应用
                if (objWorkbook != null) objWorkbook.Close(oMis, oMis, oMis);
                if (objExcel.Workbooks != null) objExcel.Workbooks.Close();
                if (objExcel != null) objExcel.Quit();                objsheet = null;
                objWorkbook = null;
                objExcel = null;
            }
            MessageBox.Show(fileNameString + "\n\n导出完毕! ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

导入方法二 private void button6_Click(object sender, EventArgs e)
        {            this.dataGridView1.DataSource = newOpenCSV(path+"\\7.csv");
        }
        public DataTable newOpenCSV(string filePath)
        {
            //Encoding encoding = Common.GetType(filePath); //Encoding.ASCII;//
            DataTable dt = new DataTable();
            FileStream fs = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);            StreamReader sr = new StreamReader(fs, Encoding.Default);
            //StreamReader sr = new StreamReader(fs, encoding);
            //string fileContent = sr.ReadToEnd();
            //encoding = sr.CurrentEncoding;
            //记录每次读取的一行记录
            string strLine = "";
            //记录每行记录中的各字段内容
            string[] aryLine = null;
            string[] tableHead = null;
            //标示列数
            int columnCount = 0;
            //标示是否是读取的第一行
            bool IsFirst = true;
            //逐行读取CSV中的数据
            while ((strLine = sr.ReadLine()) != null)
            {
                //strLine = Common.ConvertStringUTF8(strLine, encoding);
                //strLine = Common.ConvertStringUTF8(strLine);                if (IsFirst == true)
                {
                    tableHead = strLine.Split(',');
                    IsFirst = false;
                    columnCount = tableHead.Length;
                    //创建列
                    for (int i = 0; i < columnCount; i++)
                    {
                        DataColumn dc = new DataColumn(tableHead[i]);
                        dt.Columns.Add(dc);
                    }
                }
                else
                {
                    aryLine = strLine.Split(',');
                    DataRow dr = dt.NewRow();
                    for (int j = 0; j < columnCount; j++)
                    {
                        dr[j] = aryLine[j];
                    }
                    dt.Rows.Add(dr);
                }
                                 }
            if (aryLine != null && aryLine.Length > 0)
            {
                dt.DefaultView.Sort = tableHead[0] + " " + "asc";
            }            sr.Close();
            fs.Close();
            return dt;
        }

最终代码如下：
/// <summary>
        /// 导入button
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            //打开一个文件选择框
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Title = "导入数据";
            ofd.FileName = "";
            ofd.InitialDirectory = path;//ofd.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);为了获取特定的系统文件夹，可以使用System.Environment类的静态方法GetFolderPath()。该方法接受一个Environment.SpecialFolder枚举，其中可以定义要返回路径的哪个系统目录
            ofd.Filter = "Excel文件(*.xls)|*.xls|Txt文件(*.txt)|*.txt";
            ofd.ValidateNames = true;     //文件有效性验证ValidateNames，验证用户输入是否是一个有效的Windows文件名
            ofd.CheckFileExists = true;  //验证路径有效性
            ofd.CheckPathExists = true; //验证文件有效性
            string strName = string.Empty;
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                strName = ofd.FileName;
            }            if (strName == "")
            {
                MessageBox.Show("没有选择数据文件！无法进行数据导入！");
                return;
            }
            FileToDataGridView(strName, this.dataGridView1);            //不可列排序
            for (int i = 0; i < dataGridView1.Columns.Count; i++)
            {
                dataGridView1.Columns[i].SortMode = DataGridViewColumnSortMode.NotSortable;
            }        }
        /// <summary>
        /// 导入文件方法
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="dgv"></param>
        public void FileToDataGridView(string filePath, DataGridView dgv)
        {
            if (filePath.Contains(".xls"))
            {
                //根据路径打开一个Excel文件并将数据填充到DataSet中
                string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = " + filePath + ";Extended Properties ='Excel 8.0;HDR=NO;IMEX=1'";//HDR=YES 有两个值:YES/NO,表示第一行是否字段名,默认是YES,第一行是字段名
                OleDbConnection conn = new OleDbConnection(strConn);
                conn.Open();
                string strExcel = "";
                OleDbDataAdapter myCommand = null;
                DataSet ds = null;
                strExcel = "select  * from   [sheet1$]";
                myCommand = new OleDbDataAdapter(strExcel, strConn);
                ds = new DataSet();
                myCommand.Fill(ds, "table1");                //根据DataGridView的列构造一个新的DataTable
                DataTable tb = new DataTable();
                foreach (DataGridViewColumn dgvc in dgv.Columns)
                {
                    if (dgvc.Visible && dgvc.CellType != typeof(DataGridViewCheckBoxCell))
                    {
                        DataColumn dc = new DataColumn();
                        dc.ColumnName = dgvc.DataPropertyName;
                        //dc.DataType = dgvc.ValueType;//若需要限制导入时的数据类型则取消注释，前提是DataGridView必须先绑定一个数据源那怕是空的DataTable
                        tb.Columns.Add(dc);
                    }
                }                //根据Excel的行逐一对上面构造的DataTable的列进行赋值
                foreach (DataRow excelRow in ds.Tables[0].Rows)
                {
                    int i = 0;
                    DataRow dr = tb.NewRow();
                    foreach (DataColumn dc in tb.Columns)
                    {
                        dr[dc] = excelRow[i];
                        i++;
                    }
                    tb.Rows.Add(dr);
                }                //在DataGridView中显示导入的数据
                dgv.Columns.Clear();
                dgv.DataSource = tb;
            }            if (filePath.Contains(".txt"))
            {
                //Encoding encoding = Common.GetType(filePath); //Encoding.ASCII;
                DataTable dt = new DataTable();
                FileStream fs = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);                StreamReader sr = new StreamReader(fs, Encoding.Default);
                //StreamReader sr = new StreamReader(fs, encoding);
                //string fileContent = sr.ReadToEnd();
                //encoding = sr.CurrentEncoding;
                //记录每次读取的一行记录
                string strLine = "";
                //记录每行记录中的各字段内容
                string[] aryLine = null;
                string[] tableHead = null;
                //标示列数
                int columnCount = 0;
                //标示是否是读取的第一行
                bool IsFirst = true;
                //逐行读取CSV中的数据
                while ((strLine = sr.ReadLine()) != null)
                {
                    //strLine = Common.ConvertStringUTF8(strLine, encoding);
                    //strLine = Common.ConvertStringUTF8(strLine);                    if (IsFirst == true)
                    {
                        tableHead = strLine.Split('\t');
                        IsFirst = false;
                        columnCount = tableHead.Length;
                        //创建列
                        for (int i = 0; i < columnCount; i++)
                        {
                            DataColumn dc = new DataColumn(tableHead[i]);
                            dt.Columns.Add(dc);
                        }
                    }
                    else
                    {
                        aryLine = strLine.Split('\t');
                        DataRow dr = dt.NewRow();
                        for (int j = 0; j < columnCount; j++)
                        {
                            dr[j] = aryLine[j];
                        }
                        dt.Rows.Add(dr);
                    }
                }                if (aryLine != null && aryLine.Length > 0)
                {
                    //dt.DefaultView.Sort = tableHead[0] + " " + "asc";
                }                sr.Close();
                fs.Close();
                this.dataGridView1.Columns.Clear();
                dgv.DataSource = dt;
            }
        }
        /// <summary>
        /// 保存button
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            SaveFileDialog dlg = new SaveFileDialog();   //实例化一个SaveFileDialog保存文件对话框
            dlg.Filter = "txt文件(*.txt)|*.txt";
            dlg.FilterIndex = 0;
            dlg.RestoreDirectory = true;
            dlg.CreatePrompt = true;
            dlg.Title = "保存为txt文件";
            dlg.FileName = "trainhistorydata.txt";
            dlg.InitialDirectory = path;
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                DataGridViewToTxt(dlg, this.dataGridView1);
            }
        }
        /// <summary>
        /// 保存文件方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DataGridViewToTxt(SaveFileDialog sfd, DataGridView dgv)
        {
            Stream mystream;  //stream类是读写字节数据的数据流类中最基础的基类
            mystream = sfd.OpenFile();    //打开用户选定的具有读写权限的文件，并把获取的文件路径赋值给mystream
            StreamWriter sw = new StreamWriter(mystream, System.Text.Encoding.GetEncoding(-0));   //实例化数据流的写入，encoding获取编码方式
            string columntitle = "";            try
            {
                //写入列标题
                for (int i = 0; i < dgv.ColumnCount; i++)
                {
                    if (i > 0)
                    {
                        columntitle += "\t"; //添加一个分隔符
                    }
                    columntitle += dgv.Columns[i].HeaderText;
                }
                sw.WriteLine(columntitle);
                //写入列内容
                for (int j = 0; j < dgv.Rows.Count; j++)
                {
                    string columnvalue = "";
                    for (int k = 0; k < dgv.Columns.Count; k++)
                    {
                        if (k > 0)
                            columnvalue += "\t";
                        if (dgv.Rows[j].Cells[k].Value == null)
                            columnvalue += "";
                        else
                            columnvalue += dgv.Rows[j].Cells[k].Value.ToString().Trim();
                    }
                    sw.WriteLine(columnvalue);
                }
                sw.Close();
                mystream.Close();
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString());
            }
            finally
            {
                sw.Close();
                mystream.Close();
            }
        }结贴啦

调试易

datagridview与excel文件的导入导出

解决方案 »