c# excel 导入 与 导出（可直接用）
2024-03-23 09:26:43
c#操作excel方式很多
- 采用OleDB读取EXCEL文件：
- 引用的com组件：Microsoft.Office.Interop.Excel.dll 读取EXCEL文件
- 将EXCEL文件转化成CSV（逗号分隔）的文件，用文件流读取
这些其实都不好，因为需要配置环境
我要介绍的是与环境无关的，即使部署到服务器也没有啥关系；
需要引用
using NPOI.HSSF.UserModel;
using NPOI.SS.Formula.Eval;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.XSSF.UserModel;
ICSharpCode.SharpZipLib 这个也需要
上代码，将excel导入到table中
/// <summary>
/// 将制定sheet中的数据导出到datatable中
/// </summary>
/// <param name="sheet">需要导出的sheet</param>
/// <param name="headerRowIndex">列头所在行号，-1表示没有列头</param>
/// <param name="needHeader"></param>
/// <param name="tableNameRowIndex"></param>
/// <returns></returns>
static DataTable ImportDt(ISheet sheet, int headerRowIndex, bool needHeader, int tableNameRowIndex = -1)
{
var table = new DataTable();
IRow headerRow;
int cellCount;
try
{
if (headerRowIndex < 0 || !needHeader)
{
headerRow = sheet.GetRow(0);
cellCount = headerRow.LastCellNum; for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
var column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}
}
else
{
headerRow = sheet.GetRow(headerRowIndex);
cellCount = headerRow.LastCellNum;
if (tableNameRowIndex > -1)
{
var head = sheet.GetRow(tableNameRowIndex);
table.TableName = head.GetCell(0).StringCellValue;
} for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
if (headerRow.GetCell(i) == null)
{
if (table.Columns.IndexOf(Convert.ToString(i)) > 0)
{
var column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
var column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}
}
else if (table.Columns.IndexOf(headerRow.GetCell(i).ToString()) > 0)
{
var column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
var column = new DataColumn(headerRow.GetCell(i).ToString());
table.Columns.Add(column);
}
}
}
int rowCount = sheet.LastRowNum;
for (int i = (headerRowIndex + 1); i <= sheet.LastRowNum; i++)
{
try
{
IRow row;
if (sheet.GetRow(i) == null)
{
row = sheet.CreateRow(i);
}
else
{
row = sheet.GetRow(i);
} DataRow dataRow = table.NewRow(); for (int j = row.FirstCellNum; j < cellCount; j++)
{
try
{
if (row.GetCell(j) != null)
{
switch (row.GetCell(j).CellType)
{
case CellType.String:
string str = row.GetCell(j).StringCellValue;
if (str != null && str.Length > 0)
{
dataRow[j] = str.ToString();
}
else
{
dataRow[j] = null;
}
break;
case CellType.Numeric:
if (DateUtil.IsCellDateFormatted(row.GetCell(j)))
{
dataRow[j] = DateTime.FromOADate(row.GetCell(j).NumericCellValue);
}
else
{
dataRow[j] = Convert.ToDouble(row.GetCell(j).NumericCellValue);
}
break;
case CellType.Boolean:
dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue);
break;
case CellType.Error:
dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue);
break;
case CellType.Formula:
switch (row.GetCell(j).CachedFormulaResultType)
{
case CellType.String:
string strFORMULA = row.GetCell(j).StringCellValue;
if (strFORMULA != null && strFORMULA.Length > 0)
{
dataRow[j] = strFORMULA.ToString();
}
else
{
dataRow[j] = null;
}
break;
case CellType.Numeric:
dataRow[j] = Convert.ToString(row.GetCell(j).NumericCellValue);
break;
case CellType.Boolean:
dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue);
break;
case CellType.Error:
dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue);
break;
default:
dataRow[j] = "";
break;
}
break;
default:
dataRow[j] = "";
break;
}
}
}
catch (Exception exception)
{
var str = exception.Message;
throw;
}
}
table.Rows.Add(dataRow);
}
catch (Exception exception)
{
var str = exception.Message;
throw;
}
}
}
catch (Exception exception)
{
var str = exception.Message;
throw;
}
return table;
}
下面上代码直接是table到excel
/// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
public static MemoryStream ExportDt(DataTable dtSource, string strHeaderText)
{
var workbook = new HSSFWorkbook();
var sheet = workbook.CreateSheet() as HSSFSheet; var cellStyle = workbook.CreateBasicCellStyle(); HSSFCellStyle dateStyle = workbook.CreateBasicCellStyle();
var format = workbook.CreateDataFormat() as HSSFDataFormat;
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
//取得列宽
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName).Length + 6;
}
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，填充表头，填充列头，样式 if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet() as HSSFSheet;
} #region 表头及样式 if (!string.IsNullOrEmpty(strHeaderText) && strHeaderText != "下载开票模板_Evan")
{
var headerRow = sheet.CreateRow(0) as HSSFRow;
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText); var headStyle = workbook.CreateCellStyle() as HSSFCellStyle;
headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
var font = workbook.CreateFont() as HSSFFont;
font.FontHeightInPoints = 16;
font.Boldweight = 700;
headStyle.SetFont(font); headerRow.GetCell(0).CellStyle = headStyle; sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
//headerRow.Dispose(); if (dtSource.Columns[dtSource.Columns.Count - 1].ColumnName == "编号")
{
sheet.SetColumnHidden(dtSource.Columns.Count - 1, true);
}
// sheet.SetColumnHidden(); } #endregion #region 列头及样式 {
var rownum = 0;
if (strHeaderText == "下载开票模板_Evan")
{
rownum = 0;
}
else
{
rownum = string.IsNullOrEmpty(strHeaderText) ? 0 : 1;
}
var headerRow = sheet.CreateRow(rownum) as HSSFRow; headerRow.HeightInPoints = 20; var headStyle = workbook.CreateCellStyle() as HSSFCellStyle;
headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
var font = workbook.CreateFont() as HSSFFont;
font.FontHeightInPoints = 11;
font.Boldweight = 600;
headStyle.SetFont(font); headStyle.BorderLeft = BorderStyle.Thin;
headStyle.BorderRight = BorderStyle.Thin;
headStyle.BorderTop = BorderStyle.Thin;
headStyle.BorderBottom = BorderStyle.Thin; foreach (DataColumn column in dtSource.Columns)
{
if (strHeaderText == "下载开票模板_Evan")
{
//headStyle.IsLocked = true;
headerRow.CreateCell(column.Ordinal).CellStyle = headStyle;
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
}
else
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
//设置列宽
//sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
}
}
//sheet.CreateFreezePane(0, 1, 0, 1);
//sheet.CreateFreezePane(1, 0, 1, 0);
//headerRow.Dispose();
} #endregion if (strHeaderText == "下载开票模板_Evan")
{
rowIndex = 1;
}
else
{
rowIndex = string.IsNullOrEmpty(strHeaderText) ? 1 : 2;
}
} #endregion #region 填充内容 var dataRow = sheet.CreateRow(rowIndex) as HSSFRow; foreach (DataColumn column in dtSource.Columns)
{
var newCell = dataRow.CreateCell(column.Ordinal) as HSSFCell; newCell.CellStyle = cellStyle; string drValue = row[column].ToString(); #region 写单元格的值 switch (column.DataType.ToString())
{
case "System.String": //字符串类型
double result;
if (IsNumeric(drValue, out result))
{
double.TryParse(drValue, out result);
newCell.SetCellValue(result);
break;
}
else
{
newCell.SetCellValue(drValue);
break;
} case "System.DateTime": //日期类型
DateTime dateV;
if (DateTime.TryParse(drValue, out dateV))
{
newCell.SetCellValue(dateV);
newCell.CellStyle = dateStyle; //格式化显示
}
break;
case "System.Boolean": //布尔型
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": //浮点型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case "System.DBNull": //空值处理
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue(drValue);
break;
} #endregion if (strHeaderText == "下载开票模板_Evan")
{
if (column.ColumnName == "Booking Branch" || column.ColumnName == "Customer ID" || column.ColumnName == "EBBS relationship ID" || column.ColumnName == "Customer ID/counterparty ID" || column.ColumnName == "EBBS Master ID" || column.ColumnName == "分行代码" || column.ColumnName == "客户编码")
{
newCell.SetCellValue(drValue);
}
}
} #endregion rowIndex++;
}
using (var ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
return ms;
}
}
/// <summary>
/// DataTable导出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">保存位置</param>
public static void DataTableToExcel(DataTable dtSource, string strHeaderText, string strFileName)
{
string[] temp = strFileName.Split('.'); if (temp[temp.Length - 1] == "xls" && dtSource.Columns.Count < 256 && dtSource.Rows.Count < 65536)
{
using (MemoryStream ms = ExportDt(dtSource, strHeaderText))
{
using (var fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}
else
{
if (temp[temp.Length - 1] == "xls")
strFileName = strFileName + "x"; using (var fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
ExportDti(dtSource, strHeaderText, fs);
} }
}
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