Npoi匯出excel整理（附原始碼）
阿新 • • 發佈：2018-12-21
http://www.cnblogs.com/WikStone/archive/2013/01/12/2857466.html
前些日子做了一個簡單的winform程式，需要匯出的功能，剛開始省事直接使用微軟的元件，但是匯出之後發現效率極其低下，絕對像web那樣使用npoi元件，因此簡單的進行了整理，包括直接根據DataTable匯出excel及DataGridview匯出excel，版本是1.2.4，下面貼下主要程式碼兩種方式，1、NPOI匯出excel、 2、普通的匯出excel
下面貼下主要程式碼：NPOI匯出
/// <summary>
/// DataTable匯出到Excel檔案
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表頭文字</param>
/// <param name="strFileName">儲存位置</param>
public static void DataTableToExcel(DataTable dtSource, string strHeaderText, string strFileName)
{
using (MemoryStream ms = DataTableToExcel(dtSource, strHeaderText))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}
/// <summary>
/// DataTable匯出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表頭文字</param>
public static MemoryStream DataTableToExcel(DataTable dtSource, string strHeaderText)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet();
#region 右擊檔案 屬性資訊
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "NPOI";
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = "檔案作者資訊"; //填加xls檔案作者資訊
si.ApplicationName = "建立程式資訊"; //填加xls檔案建立程式資訊
si.LastAuthor = "最後儲存者資訊"; //填加xls檔案最後儲存者資訊
si.Comments = "作者資訊"; //填加xls檔案作者資訊
si.Title = "標題資訊"; //填加xls檔案標題資訊
si.Subject = "主題資訊";//填加檔案主題資訊
si.CreateDateTime = System.DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
HSSFCellStyle dateStyle = (HSSFCellStyle)workbook.CreateCellStyle();
HSSFDataFormat format = (HSSFDataFormat)workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
//取得列寬
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
int rowIndex = 0;
foreach (DataRow row in dtSource.Rows)
{
#region 新建表，填充表頭，填充列頭，樣式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = (HSSFSheet)workbook.CreateSheet();
}
#region 表頭及樣式
{
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0);
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText);
HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();
// headStyle.Alignment = CellHorizontalAlignment.CENTER;
HSSFFont font = (HSSFFont)workbook.CreateFont();
font.FontHeightInPoints = 20;
font.Boldweight = 700;
headStyle.SetFont(font);
headerRow.GetCell(0).CellStyle = headStyle;
// sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
//headerRow.Dispose();
}
#endregion
#region 列頭及樣式
{
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(1);
HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();
//headStyle.Alignment = CellHorizontalAlignment.CENTER;
HSSFFont font = (HSSFFont)workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
//設定列寬
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
}
// headerRow.Dispose();
}
#endregion
rowIndex = 2;
}
#endregion
#region 填充內容
HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
HSSFCell newCell =(HSSFCell) dataRow.CreateCell(column.Ordinal);
string drValue = row[column].ToString();
switch (column.DataType.ToString())
{
case "System.String"://字串型別
newCell.SetCellValue(drValue);
break;
case "System.DateTime"://日期型別
System.DateTime dateV;
System.DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);
newCell.CellStyle = dateStyle;//格式化顯示
break;
case "System.Boolean"://布林型
bool boolV = false;
bool.TryParse(drValue, out boolV);
newCell.SetCellValue(boolV);
break;
case "System.Int16"://整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case "System.Decimal"://浮點型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case "System.DBNull"://空值處理
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue("");
break;
}
}
#endregion
rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
sheet.Dispose();
//workbook.Dispose();//一般只用寫這一個就OK了，他會遍歷並釋放所有資源，但當前版本有問題所以只釋放sheet
return ms;
}
}
普通excel匯出
#region 匯出excel
public static void ExportExcel(string fileName, DataGridView myDGV,bool isShowDialog)
{
string saveFileName = "";
if (isShowDialog)
{
//bool fileSaved = false;
SaveFileDialog saveDialog = new SaveFileDialog();
saveDialog.DefaultExt = "xls";
saveDialog.Filter = "Excel檔案|*.xls";
saveDialog.FileName = fileName;
saveDialog.ShowDialog();
saveFileName = saveDialog.FileName;
if (saveFileName.IndexOf(":") < 0) return; //被點了取消
}
else
{
// saveFileName = Application.StartupPath + @"\匯出記錄\" + fileName + ".xls";
saveFileName = fileName;
}
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
if (xlApp == null)
{
MessageBox.Show("無法建立Excel物件，可能您的機子未安裝Excel");
return;
}
Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
//寫入標題
for (int i = 0; i < myDGV.ColumnCount; i++)
{
worksheet.Cells[1, i + 1] = myDGV.Columns[i].HeaderText;
}
//寫入數值
for (int r = 0; r < myDGV.Rows.Count; r++)
{
for (int i = 0; i < myDGV.ColumnCount; i++)
{
if (myDGV[i, r].ValueType == typeof(string)
|| myDGV[i, r].ValueType == typeof(DateTime))//這裡就是驗證DataGridView單元格中的型別,如果是string或是DataTime型別,則在放入緩 存時在該內容前加入" ";
{
worksheet.Cells[r + 2, i + 1] = "'" + myDGV.Rows[r].Cells[i].Value;
}
else
{
worksheet.Cells[r + 2, i + 1] = myDGV.Rows[r].Cells[i].Value;
}
}
System.Windows.Forms.Application.DoEvents();
}
worksheet.Columns.EntireColumn.AutoFit();//列寬自適應
//if (Microsoft.Office.Interop.cmbxType.Text != "Notification")
//{
// Excel.Range rg = worksheet.get_Range(worksheet.Cells[2, 2], worksheet.Cells[ds.Tables[0].Rows.Count + 1, 2]);
// rg.NumberFormat = "00000000";
//}
if (saveFileName != "")
{
try
{
workbook.Saved = true;
workbook.SaveCopyAs(saveFileName);
//fileSaved = true;
}
catch (Exception ex)
{
//fileSaved = false;
MessageBox.Show("匯出檔案時出錯,檔案可能正被開啟！\n" + ex.Message);
}
}
//else
//{
// fileSaved = false;
//}
xlApp.Quit();
GC.Collect();//強行銷燬
// if (fileSaved && System.IO.File.Exists(saveFileName)) System.Diagnostics.Process.Start(saveFileName); //開啟EXCEL
MessageBox.Show(fileName + "儲存成功", "提示", MessageBoxButtons.OK);
}
#endregion
5萬條資料效能測試
下面附上原始碼，裡面有NPOI和普通匯出excel的效能比較。
下載原始碼 如果您覺的文章不錯，請點選推薦！