C# 创建 写入 读取 excel
public static void CreateExcelFile(string FileName, List<UUser> luu)
{
if (FileName.Split('.')[FileName.Split('.').Length - 1] == "xlsx")//如果是2007版以后
{
//create
object Nothing = System.Reflection.Missing.Value;
var app = new Excel.Application();
app.Visible = false;
Excel.Workbook workBook = app.Workbooks.Add(Nothing);
Excel.Worksheet worksheet = (Excel.Worksheet)workBook.Sheets[1];
worksheet.Name = "Sheet1";
//headline
int i = 1;
foreach (UUser uu in luu)
{
worksheet.Cells[1, i] = uu.name;
i++;
}
worksheet.SaveAs(FileName, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing);
workBook.Close(false, Type.Missing, Type.Missing);
app.Quit();
}
else
{
HSSFWorkbook wk = new HSSFWorkbook(); //创建一个名称为mySheet的表
ISheet tb = wk.CreateSheet("Sheet1");
//创建一行，此行为第二行
IRow row = tb.CreateRow(1);
for (int i = 0; i < luu.Count; i++)
{
ICell cell = row.CreateCell(i); //在第二行中创建单元格
cell.SetCellValue(luu[i].name);//循环往第二行的单元格中添加数据 }
using (FileStream fs = File.OpenWrite(FileName))
{
wk.Write(fs); //向打开的这个xls文件中写入mySheet表并保存。
}
}
}
}using Excel = Microsoft.Office.Interop.Excel;
using NExcel;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
需要这些引用 dll网上都可以下载
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="sheetName">excel工作薄sheet的名称</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
/// <returns>返回的DataTable</returns>
public static DataTable ExcelToDataTable(string name, string sheetName, bool isFirstRowColumn)//name 是excel的地址
{
List<string> ls = new List<string>();
string sss = null;
IWorkbook workbook = null;
string fileName = name;
ISheet sheet = null;
DataTable data = new DataTable();
int startRow = 0;
try
{
FileStream 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.GetSheetAt(0);
sheet = workbook.GetSheet(sheetName);
}
else
{
sheet = workbook.GetSheetAt(0);
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow(0);
int cellCount = firstRow.Cells.Count; //一行最后一个cell的编号 即总的列数
if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
DataColumn column = new DataColumn(firstRow.GetCell(i).StringCellValue.Replace("\n", "").Replace(" ","").Replace("\t","").Replace("\r",""));
data.Columns.Add(column);
}
startRow = sheet.FirstRowNum + 1;
}
else
{
startRow = sheet.FirstRowNum;
}
//最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
IRow row = sheet.GetRow(i);
if (row == null) continue; //没有数据的行默认是null
DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
{
switch (row.GetCell(j).CellType)
{
case NPOI.SS.UserModel.CellType.Blank: //空数据类型处理
dataRow[j] = "";
break;
case NPOI.SS.UserModel.CellType.String: //字符串类型
dataRow[j] = "'" + row.GetCell(j).StringCellValue;
break;
case NPOI.SS.UserModel.CellType.Numeric: //数字类型
if (HSSFDateUtil.IsCellDateFormatted(row.GetCell(j)))
{
dataRow[j] ="'"+row.GetCell(j).DateCellValue.ToShortDateString().Split(' ')[0];
}
else
{
if (row.GetCell(j).NumericCellValue.ToString().IndexOf(".") < 0)
dataRow[j] = row.GetCell(j).NumericCellValue;
else
{
dataRow[j] =Convert.ToDouble( getstr( row.GetCell(j).NumericCellValue.ToString()));
}
}
break;
case NPOI.SS.UserModel.CellType.Formula:
if (fileName.IndexOf(".xlsx") < 0)
{
HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(workbook);
dataRow[j] = e.Evaluate(row.GetCell(j)).StringValue;
}
else
{
XSSFFormulaEvaluator e = new XSSFFormulaEvaluator(workbook);
dataRow[j] = e.Evaluate(row.GetCell(j)).StringValue;
}
break;
default:
row.GetCell(j).SetCellType(NPOI.SS.UserModel.CellType.String);
dataRow[j] = row.GetCell(j).StringCellValue;
break;
}
}
}
data.Rows.Add(dataRow);
}
}
fs.Close();
return data;
}
catch (Exception ex)
{
// MessageBox.Show("err："+ex.Message);
return new DataTable();
}
}
public static void DataTableToExcel(DataTable dt, Excel.Worksheet excelSheet,ProgressBar s,List<UUser> luu) { s.Maximum = dt.Rows.Count * luu.Count; s.Value = 0; s.Visible = true; int rowCount = dt.Rows.Count ; int colCount =luu.Count; object[,] dataArray = new object[rowCount+1, colCount]; for (int k = 0; k < luu.Count; k++) { string str= luu[k].name; dataArray[0, k] = str; } for (int i = 0; i < rowCount; i++) { for (int j = 0; j < luu.Count; j++) { dataArray[i + 1, j] =dt.Rows[i][luu[j].source]; Application.DoEvents(); s.Value = s.Value + 1; } } excelSheet.Range["A1", excelSheet.Cells[rowCount+1, colCount]].Value2 = dataArray; s.Visible = false; s.Value = 0; }
这个uuser 有两个字段 Name 和 Source
name 是写入到新excel的列名
source 是datatable里的列名
这个是一个excel转换的流程
如果只是读取和写入直接去掉list<uuser>即可
