DataGridView导入导出excel

DataGridView导出到Excel

#region 方法一 DateGridView导出到csv格式的Excel
/// <summary>
/// 导出数据到Excel.常用方法，列之间加\t，一行一行输出，此文件其实是csv文件，不过默认可以当成Excel打开。
/// </summary>
/// <param name="dgv"></param>
private void DataGridViewToExcel(DataGridView dgv)
{
    SaveFileDialog saveFileDialog = new SaveFileDialog();
    saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
    saveFileDialog.FilterIndex = ;
    saveFileDialog.RestoreDirectory = true;
    saveFileDialog.CreatePrompt = true;
    saveFileDialog.Title = "导出Excel文件到";
    saveFileDialog.ShowDialog();
    if (saveFileDialog.FileName == "")
    {
        return;
    }
    Stream myStream;
    myStream = saveFileDialog.OpenFile();
    StreamWriter sw = new StreamWriter(myStream, Encoding.Default);
    string strhead = "";
    string str = "";

    try
    {
        //写表格标题
        for (int i = ; i < dgv.ColumnCount; i++)
        {
            if (i == dgv.ColumnCount - )
                strhead = strhead + dgv.Columns[i].HeaderText.ToString().Replace("\r", " ").Replace("\n", " ").Replace("\t", " ") + "\n";
            else
                strhead = strhead + dgv.Columns[i].HeaderText.ToString().Replace("\r", " ").Replace("\n", " ").Replace("\t", " ") + "\t";
        }
        sw.Write(strhead);

        //写内容
        for (int i = ; i < dgv.Rows.Count; i++)
        {
            for (int j = ; j < dgv.ColumnCount; j++)
            {
                if (j == dgv.ColumnCount - )
                    str = str + dgv.Rows[i].Cells[j].Value.ToString().Replace("\r", " ").Replace("\n", " ").Replace("\t", " ") + "\n";
                else
                    str = str + dgv.Rows[i].Cells[j].Value.ToString().Replace("\r", " ").Replace("\n", " ").Replace("\t", " ") + "\t";
            }
            sw.Write(str);
            str = "";
        }
        sw.Close();
        myStream.Close();
    }
    catch (Exception e1)
    {
        MessageBox.Show(e1.ToString());
    }
    finally
    {
        sw.Close();
        myStream.Close();
    }
}
#endregion

#region 方法二 DataGridView数据显示到Excel
/// <summary>
/// 打开Excel并将DataGridView控件中数据导出到Excel
/// </summary>
/// <param name="dgv">DataGridView对象 </param>
/// <param name="isShowExcle">是否显示Excel界面 </param>
/// <remarks>
/// add com "Microsoft Excel 11.0 Object Library"
/// using Excel=Microsoft.Office.Interop.Excel;
/// </remarks>
/// <returns> </returns>
public bool DataGridviewShowToExcel(DataGridView dgv, bool isShowExcle)
{
    if (dgv.Rows.Count == )
        return false;
    //建立Excel对象
    Excel.Application excel = new Excel.Application();
    excel.Application.Workbooks.Add(true);
    excel.Visible = isShowExcle;
    //生成字段名称
    for (int i = ; i < dgv.ColumnCount; i++)
    {
        excel.Cells[, i + ] = dgv.Columns[i].HeaderText;
    }
    //填充数据
    for (int i = ; i < dgv.RowCount - ; i++)
    {
        for (int j = ; j < dgv.ColumnCount; j++)
        {
            if (dgv[j, i].ValueType == typeof(string))
            {
                excel.Cells[i + , j + ] = "'" + dgv[j, i].Value.ToString();
            }
            else
            {
                excel.Cells[i + , j + ] = dgv[j, i].Value.ToString();
            }
        }
    }
    return true;
}
#endregion 

#region 方法三 DataGridView导出到Excel，有一定的判断性
/// <summary>    www.2cto.com
///方法，导出DataGridView中的数据到Excel文件
/// </summary>
/// <remarks>
/// add com "Microsoft Excel 11.0 Object Library"
/// using Excel=Microsoft.Office.Interop.Excel;
/// using System.Reflection;
/// </remarks>
/// <param name= "dgv"> DataGridView </param>
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 <= )
    {
        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 <= )
    {
        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 > )
    {
        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 > )
    {
        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
    Excel.Application objExcel = null;
    Excel.Workbook objWorkbook = null;
    Excel.Worksheet objsheet = null;
    try
    {
        //申明对象
        objExcel = new Microsoft.Office.Interop.Excel.Application();
        objWorkbook = objExcel.Workbooks.Add(Missing.Value);
        objsheet = (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 = ;
        for (int i = ; i <= dgv.ColumnCount - ; i++)
        {
            if (dgv.Columns[i].Visible == true)
            {
                objExcel.Cells[, 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 = ; row <= dgv.RowCount - ; row++)
        {
            //tempProgressBar.PerformStep();   

            displayColumnsCount = ;
            for (int col = ; col < colscount; col++)
            {
                if (dgv.Columns[col].Visible == true)
                {
                    try
                    {
                        objExcel.Cells[row + , 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, 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);  

} 

#endregion 

Excel导入到DataGridView

/// <summary>
/// Excel数据导入方法
/// </summary>
/// <param name="filePath"></param>
/// <param name="dgv"></param>
public void ExcelToDataGridView(DataGridView dgv)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Title = "从Excel文件导入数据";
ofd.FileName = "";
ofd.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
ofd.Filter = "Excel文件(*.xls)|*.xls";
ofd.ValidateNames = true;
ofd.CheckFileExists = true;
ofd.CheckPathExists = true;

string fileName = string.Empty;
if (ofd.ShowDialog() == DialogResult.OK)
{
    fileName = ofd.FileName;
    //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 = " + fileName + ";Extended Properties ='Excel 8.0;HDR=NO;IMEX=1'";//导入时包含Excel中的第一行数据，并且将数字和字符混合的单元格视为文本进行导入
    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[].Rows)
    {
        if (excelRow[].ToString().Trim().Equals("")) continue;

        int i = ;
        DataRow dr = tb.NewRow();
        foreach (DataColumn dc in tb.Columns)
        {
            try
            {
                dr[dc] = excelRow[i];
            }
            catch
            {
                dr[dc] = "";
            }
            i++;

        }
        tb.Rows.Add(dr);
    }
    //在DataGridView中显示导入的数据,先清除，后绑定
    //dgv.Columns.Clear();
    dgv.DataSource = tb;
}