C#使用NPOI導出Excel
NPOI能夠在沒有安裝Office的狀況下對Word或Excel文檔進行讀寫操做瀏覽器
下面介紹下NPOI操做Excel的方法服務器
首先咱們須要下載NPOI的程序集 app
下載地址 http://npoi.codeplex.com/releasesthis
我下載下來是有這兩個文件spa
這裏使用的是net4.0excel
將下面幾個dll添加到項目中並引用code
廢話很少說 上代碼orm
/// <summary>
/// create 2016-11-30 by sly
/// 將DataTable數據導入到excel中 此方法直接返回文件給瀏覽器下載
/// </summary>
/// <param name="data">要導入的數據</param>
/// <param name="isColumnWritten">DataTable的列名是否要導入</param>
/// <param name="sheetName">要導入的excel的sheet的名稱</param>
/// <param name="widthDic">要設置的寬度(key 列下標,val 寬度大小)</param>
/// <returns></returns>
public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten, Dictionary<int, int> widthDic = null)
{
int i = 0;
int j = 0;
int count = 0;
ISheet sheet = null;
MemoryStream file = new MemoryStream();
if (fileName.IndexOf(".xlsx") > 0) //2007版本
workbook = new XSSFWorkbook();
else
if (fileName.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook();
try
{
if (workbook != null)
{
sheet = workbook.CreateSheet(sheetName);
//設置全部列寬
for (int l = 0; l <= data.Rows.Count; l++)
{
sheet.DefaultColumnWidth = 12;
}
if (widthDic != null)
{
//設定自定義寬度
foreach (var item in widthDic)
{
sheet.SetColumnWidth(item.Key, item.Value);
}
}
}
else
{
return -1;
}
if (isColumnWritten == true) //寫入DataTable的列名
{
IRow row = sheet.CreateRow(0);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
}
count = 1;
}
else
{
count = 0;
}
int outRes = -1;
for (i = 0; i < data.Rows.Count; ++i)
{
IRow row = sheet.CreateRow(count);
for (j = 0; j < data.Columns.Count; ++j)
{
if (int.TryParse(data.Rows[i][j].ToString(), out outRes))
{
row.CreateCell(j).SetCellValue(Convert.ToInt32(data.Rows[i][j].ToString()));
}
else
{
if (!string.IsNullOrEmpty(data.Rows[i][j].ToString()) && data.Rows[i][j].ToString().Length > 10)
{
if ((data.Rows[i][j].ToString().Substring(0, 7) == "http://" || data.Rows[i][j].ToString().Substring(0, 8) == "https://"))
{
var TCell = row.CreateCell(j);
HSSFHyperlink link = new HSSFHyperlink(HyperlinkType.Url);//建一個HSSFHyperlink實體，指明連接類型爲URL
TCell.SetCellValue(data.Rows[i][j].ToString());
link.Address = data.Rows[i][j].ToString();//給HSSFHyperlink的地址賦值
TCell.Hyperlink = link;
}
else
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
}
else
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
}
}
++count;
}
workbook.Write(file); //寫入到excel
var context = System.Web.HttpContext.Current;
context.Response.ContentType = "application/vnd.ms-excel";
context.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", fileName));
context.Response.Clear();
context.Response.BinaryWrite(file.GetBuffer());
context.Response.End();
return count;
}
catch (Exception ex)
{
return -2;
}
}
/// <summary>
/// 將excel中的數據導入到DataTable中
/// </summary>
/// <param name="sheetName">excel工做薄sheet的名稱</param>
/// <param name="isFirstRowColumn">第一行是不是DataTable的列名</param>
/// <returns></returns>
public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn)
{
ISheet sheet = null;
DataTable data = new DataTable();
int startRow = 0;
try
{
fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
if (fileName.IndexOf(".xlsx") > 0) // 2007版本
workbook = new XSSFWorkbook(fs);
else
if (fileName.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook(fs);
if (sheetName != null)
{
sheet = workbook.GetSheet(sheetName);
if (sheet == null) //若是沒有找到指定的sheetName對應的sheet，則嘗試獲取第一個sheet
{
sheet = workbook.GetSheetAt(0);
}
}
else
{
sheet = workbook.GetSheetAt(0);
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow(0);
int cellCount = firstRow.LastCellNum; //一行最後一個cell的編號 即總的列數
if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
ICell cell = firstRow.GetCell(i);
if (cell != null)
{
string cellValue = cell.StringCellValue;
if (cellValue != null)
{
DataColumn column = new DataColumn(cellValue);
data.Columns.Add(column);
}
}
}
startRow = sheet.FirstRowNum + 1;
}
else
{
startRow = sheet.FirstRowNum;
}
//最後一列的標號
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
IRow row = sheet.GetRow(i);
if (row == null) continue; //沒有數據的行默認是null
DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
if (row.GetCell(j) != null) //同理，沒有數據的單元格都默認是null
dataRow[j] = row.GetCell(j).ToString();
}
data.Rows.Add(dataRow);
}
}
return data;
}
catch (Exception ex)
{
return null;
}
}
/// <summary>
/// 合併單元格
/// </summary>
/// <param name="sheet">要合併單元格所在的sheet</param>
/// <param name="rowstart">開始行的索引</param>
/// <param name="rowend">結束行的索引</param>
/// <param name="colstart">開始列的索引</param>
/// <param name="colend">結束列的索引</param>
public static void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend)
{
CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend);
sheet.AddMergedRegion(cellRangeAddress);
}
//調用導出方法
new Helper.ExcelHelper("導出的文件名.xls").DataTableToExcel(dt, "sheet1", true, null);
new Helper.ExcelHelper("導出的文件名.xlsx").DataTableToExcel(dt, "sheet1", true, null);
下面是導入blog
<input type="file" name="fileField" class="file" id="fileField" value="導入" style="display: none;" />
<script>
$("#fileField").live("change", function () {
var Reg = new RegExp("^.+\.(xls)");
var Reg2 = new RegExp("^.+\.(xlsx)");
if (Reg.test($(this).val()) || Reg.test2($(this).val())) {
ImportGrade();//此處調用後臺導入方法，這裏就不寫了哈
} else {
$.IvanDialogOpen({ "Type": "tips", "Info": "僅支持 .xls ，.xlsx 文件", "Plugins": { CloseTime: 800 } });
}
})
</script>
/// <summary>
/// 導入Demo
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
public ActionResult ImportGrade(string filePath)
{
//獲取文件在服務器上的路徑
string path = string.Concat(FileUpload.GetFilePath(UploadType.ImportGradeFile), filePath);
//根據上傳路徑獲取表格數據
ExcelHelper eh = new ExcelHelper(path.Replace("\\", "/"));
DataTable dt = eh.ExcelToDataTable("Sheet1", true);
return Content("");
}
以上就是NPOI的簡單使用方法索引