c# - 如何将 datagridview 单元格格式值导出到 excel？

Question

我正在制作 Windows 窗体应用程序。

单击导出按钮时，datagridview 的数据导出到 Excel 文件。

我已经构建了该代码，并且运行良好。但是今天我更新了我的代码。

我添加 Datagridview 的 CellFormatting 事件，更改文件大小值，并显示

它到Datagridview。

然后，我导出到 excel 但在 excel 文件中，仍然显示原始数据

也就是说，原始数据是451936256，转换后的数据是431MB

在 excel 表中，它显示 451936256。

我的代码在下面

   //Button click Event
    private void mtbtnExportToExcel_Click(object sender, EventArgs e)
            {
                DataGridView[] dgv = new DataGridView[] { mgrdWebApplication, mgrdContentDatabase, mgrdSiteCollections, mgrdSites, mgrdLists, mgridDocumentLibrary };
                mtProgressStatus.Spinning = true;
                ExportDataToExcel(dgv, "MigStatus");
                mtProgressStatus.Spinning = false;

            }
    //Export gridview data to excel
    private bool ExportDataToExcel(DataGridView[] dgv, string fileName)
            {
                string saveFileName = "";
                SaveFileDialog saveDialog1 = new SaveFileDialog();
                saveDialog1.DefaultExt = "xlsx";
                saveDialog1.Filter = "Excel file|*.xlsx";
                saveDialog1.FileName = fileName;
                saveDialog1.ShowDialog();
                saveFileName = saveDialog1.FileName;

                if (saveFileName.IndexOf(":") < 0)
                    return false;

                Excel.Application xlApp = new Excel.Application();

                if (xlApp == null) 
                {
                    MessageBox.Show("Can`t create Excel");
                    return false;
                }

                Excel.Workbooks workBooks = xlApp.Workbooks;
                Excel.Workbook workBook = xlApp.Workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
                Excel.Worksheet workSheet = (Excel.Worksheet)workBook.Worksheets[1];

                try
                {
                    for (int index = 0; index < dgv.Length; index++)
                    {
                        for (int i = 0; i < dgv[index].ColumnCount; i++)
                        {
                            if (dgv[index].Columns[i].Visible)
                                workSheet.Cells[1, i + 1] = dgv[index].Columns[i].HeaderText;
                        }

                        for (int r = 0; r < dgv[index].Rows.Count; r++)
                        {
                            for (int i = 0; i < dgv[index].ColumnCount; i++)
                            {
                                if (dgv[index].Columns[i].Visible)
                                    workSheet.Cells[r + 2, i + 1] = dgv[index].Rows[r].Cells[i].Value.ToString();
                            }
                            Application.DoEvents();
                        }
                        ((Excel.Range)workSheet.Rows[1, Type.Missing]).Font.Bold = true;
                        workSheet.Columns.EntireColumn.AutoFit();

                        if (index < dgv.Length - 1)
                        {
                            workSheet = (Excel.Worksheet)workBook.Worksheets.Add();
                        }
                    }
                }
                catch(Exception ex)
                {
                    //LogWrite logWrites = new LogWrite();
                    writeLog.LogsWrite(ex.ToString());
                }

                if (saveFileName != "")
                {
                    try
                    {
                        workBook.Saved = true;
                        workBook.SaveCopyAs(saveFileName);
                    }
                    catch(Exception ex)
                    {
                        MessageBox.Show("Error, file is already opened!\n" + ex.Message);
                    }
                }
                xlApp.Quit();
                GC.Collect();
                MessageBox.Show("File : " + fileName + ".xls saved.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);

                return true;
            }
        //CellFormatting Event
        private void mgrdContentDatabase_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if(this.mgrdContentDatabase.Columns[e.ColumnIndex].HeaderText== "Size(GB)")
            {
                if (e.Value != null)
                {
                    CovertFileSize(e);
                }
            }
        }
        //convert to file size
        private void CovertFileSize(DataGridViewCellFormattingEventArgs formatting)
        {
            if (formatting.Value != null)
            {
                try
                {
                    long bytes;
                    bytes = Convert.ToInt64(formatting.Value);
                    string size = "0 Bytes";

                    //GB
                    if (bytes >= 1073741824.0)
                        size = String.Format("{0:##.##}", bytes / 1073741824.0) + " GB";
                    //MB
                    else if (bytes >= 1048576.0)
                        size = String.Format("{0:##.##}", bytes / 1048576.0) + " MB";
                    //KB
                    else if (bytes >= 1024.0)
                        size = String.Format("{0:##.##}", bytes / 1024.0) + " KB";
                    //Bytes
                    else if (bytes > 0 && bytes < 1024.0)
                        size = bytes.ToString() + " Bytes";

                    formatting.Value = size;
                    formatting.FormattingApplied = true;
                }
                catch(FormatException)
                {
                    formatting.FormattingApplied = false;
                }
            }

        }

我想将转换后的数据导出到excel。

请帮助我如何修复或添加我的代码..

谢谢

Answer 1

您应该使用 FormattedValue 细胞属性:

string value = string.Format("{0}" , dataGridView1.Rows[r].Cells[i].FormattedValue);