DataGridView导出到Excel的三个方法

原文出处：http://www.yongfa365.com/Item/DataGridViewToExcel.html

#region 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 == 0)

        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 = 0; i < dgv.ColumnCount; i++)

    {

        excel.Cells[1, i + 1] = dgv.Columns[i].HeaderText;

    }

    //填充数据 

    for (int i = 0; i < dgv.RowCount - 1; i++)

    {

        for (int j = 0; j < dgv.ColumnCount; j++)

        {

            if (dgv[j, i].ValueType == typeof(string))

            {

                excel.Cells[i + 2, j + 1] = "'" + dgv[j, i].Value.ToString();

            }

            else

            {

                excel.Cells[i + 2, j + 1] = dgv[j, i].Value.ToString();

            }

        }

    }

    return true;

}

#endregion 



#region DateGridView导出到csv格式的Excel

/// <summary>

/// 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>

/// <remarks>

/// using System.IO;

/// </remarks>

/// <param name="dgv"></param>

private void DataGridViewToExcel(DataGridView dgv)

{

    SaveFileDialog dlg = new SaveFileDialog();

    dlg.Filter = "Execl files (*.xls)|*.xls";

    dlg.FilterIndex = 0;

    dlg.RestoreDirectory = true;

    dlg.CreatePrompt = true;

    dlg.Title = "保存为Excel文件";



    if (dlg.ShowDialog() == DialogResult.OK)

    {

        Stream myStream;

        myStream = dlg.OpenFile();

        StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));

        string columnTitle = "";

        try

        {

            //写入列标题

            for (int i = 0; i < dgv.ColumnCount; i++)

            {

                if (i > 0)

                {

                    columnTitle += "\t";

                }

                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();

        }

    }

} 

#endregion



#region DataGridView导出到Excel，有一定的判断性

/// <summary> 

///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 <= 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

    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 = 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, 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