在工作开发中,客户经常要求数据库中数据导出到Excel表格。以前方法是引用office相关组件,如果客户没有安装office,功能就会遇到问题。
现在用Npoi导出Excel,导出表格是合并行列,如图:
导出的要求:合计列要进行合并,序号一致的要合并。最后一行要合并列。
因为相同序号数量不是固定的,要动态算合并的行数。
合并行列接口:XXX.AddMergedRegion(new CellRangeAddress(开始行, 最后一行, 开始列, 最后一列));
隐藏指定:sheet.SetColumnHidden(cellIndex, true);
引用组件:
NPOI.dll;
NPOI.OOXML.dll;
NPOI.OpenXml4Net.dll;
NPOI.OpenXmlFormats.dll;
ICSharpCode.SharpZipLib.dll;
代码如下:
/// <summary>
///
/// </summary>
/// <param name="dtSource">数据源</param>
/// <param name="strFileName">保存路径</param>
/// <param name="dvXH">序号</param>
public void Export(DataTable dtSource,string strFileName,DataView dvXH=null)
{
//创建工作簿 office2007以上
XSSFWorkbook workbook = new XSSFWorkbook();
//为工作簿创建工作表并命名
ISheet sheet = workbook.CreateSheet("商品表");
ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
#region 表头及样式
int cellIndex = 0;
IRow headerRow = sheet.CreateRow(0);
for (int i = 0; i < dtSource.Columns.Count; i++)
{
#region MyRegion
string ColumnsName = dtSource.Columns[i].ToString();
if (dtSource.Columns[i].ColumnName.EndsWith("XH"))
{
ColumnsName = "序号";
sheet.SetColumnWidth(cellIndex, 3000);
//sheet.SetColumnHidden(cellIndex, true);隐藏指定列
}
else if (dtSource.Columns[i].ColumnName.EndsWith("GoogName"))
{
ColumnsName = "商品名称";
sheet.SetColumnWidth(cellIndex,10000);//设置列宽
}
else if (dtSource.Columns[i].ColumnName.EndsWith("Num"))
{
ColumnsName = "数量";
sheet.SetColumnWidth(cellIndex, 5000);
}
else if (dtSource.Columns[i].ColumnName.EndsWith("Summation"))
{
ColumnsName = "合计(元)";
sheet.SetColumnWidth(cellIndex, 5000);
}
#endregion
//设置行高
headerRow.HeightInPoints = 35;
headerRow.CreateCell(cellIndex).SetCellValue(ColumnsName);
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.WrapText = true;
IFont font = workbook.CreateFont();
//字体大小
font.FontHeightInPoints = 12;
font.Boldweight = 360;
headStyle.SetFont(font);
headerRow.GetCell(cellIndex).CellStyle = headStyle;
cellIndex++;
}
#endregion
int rowIndex = 1;//行数一定要从1行开始
int count = 1;
int startRow = 1;
DataView dvSource = dtSource.DefaultView;
if (dvXH!=null)
{
foreach (DataRowView drv in dvXH)
{//1-10.11-12,13-14,15-16
int rowcout = 0;
dvSource.RowFilter = "XH='" + drv["XH"] + "'";
foreach (DataRowView row in dvSource)
{
#region 填充内容
IRow dataRow = sheet.CreateRow(rowIndex);
//序号
ICell newCel0 = dataRow.CreateCell(0);
ICellStyle style0 = workbook.CreateCellStyle();
style0.DataFormat = format.GetFormat("text");
newCel0.SetCellValue(row["XH"].ToString());
//标的名称
ICell newCel2 = dataRow.CreateCell(1);
ICellStyle style2 = workbook.CreateCellStyle();
style2.DataFormat = format.GetFormat("text");
newCel2.SetCellValue(row["GoogName"].ToString());
//标的数量
ICell newCel4 = dataRow.CreateCell(2);
ICellStyle style4 = workbook.CreateCellStyle();
style4.DataFormat = format.GetFormat("text");
newCel4.SetCellValue(row["Num"].ToString());
//合计(元)
ICell newCel8 = dataRow.CreateCell(3);
ICellStyle style8 = workbook.CreateCellStyle();
style8.DataFormat = format.GetFormat("text");
newCel8.SetCellValue(row["Summation"].ToString());
#endregion
rowIndex++;
rowcout++;
}
if (count == 1)
{
//合并行数
sheet.AddMergedRegion(new CellRangeAddress(startRow, rowcout, 3, 3));
startRow = startRow + rowcout;
}
else
{
sheet.AddMergedRegion(new CellRangeAddress(startRow, startRow + rowcout - 1, 3, 3));
startRow = startRow + rowcout;
}
count++;
}
}
else
{
#region MyRegion
foreach (DataRowView row in dvSource)
{
#region 填充内容
IRow dataRow = sheet.CreateRow(rowIndex);
//序号
ICell newCel0 = dataRow.CreateCell(0);
ICellStyle style0 = workbook.CreateCellStyle();
style0.DataFormat = format.GetFormat("text");
newCel0.SetCellValue(row["XH"].ToString());
//商品名称
ICell newCel1 = dataRow.CreateCell(1);
ICellStyle style1 = workbook.CreateCellStyle();
style1.DataFormat = format.GetFormat("text");
newCel1.SetCellValue(row["GoogName"].ToString());
//数量
ICell newCel2 = dataRow.CreateCell(2);
ICellStyle style2 = workbook.CreateCellStyle();
style2.DataFormat = format.GetFormat("text");
newCel2.SetCellValue(row["Num"].ToString());
//合计(元)
ICell newCel3 = dataRow.CreateCell(3);
ICellStyle style3 = workbook.CreateCellStyle();
style3.DataFormat = format.GetFormat("text");
newCel3.SetCellValue(row["Summation"].ToString());
#endregion
rowIndex++;
}
#endregion
}
#region 拼接最后一行
IFont fontLast = workbook.CreateFont();
fontLast.FontHeightInPoints = 30;
fontLast.Boldweight = 480;
IRow dataRowLast = sheet.CreateRow(rowIndex);
dataRowLast.HeightInPoints = 40;
ICell newCelLast = dataRowLast.CreateCell(0);
ICellStyle styleLast = workbook.CreateCellStyle();
styleLast.DataFormat = format.GetFormat("text");
styleLast.SetFont(fontLast);
newCelLast.SetCellValue("制作人:张三");
sheet.AddMergedRegion(new CellRangeAddress(rowIndex, rowIndex, 0, 3));
#endregion
MemoryStream stream = new MemoryStream();
workbook.Write(stream);
var buf = stream.ToArray();
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, 0, buf.Length);
fs.Flush();
}
}
实际运用中,涉及到数据,方法中有很多校验等操作,方法直观可读性不是太好,下面附上简单导出的方法:
实际上导出Excel,总结有几点:
1、引用相关组件
2、创建一个工作簿,创建工作表并命名;
3、设置表头及样式;
4、填充数据;
5、保存数据到指定位置;
/// <summary>
/// 简单导出数据
/// </summary>
/// <param name="dtSource">数据源</param>
/// <param name="strFileName">保存路径</param>
/// <param name="dvXH">序号</param>
public void Export1(DataTable dtSource, string strFileName)
{
//创建工作簿
XSSFWorkbook workbook = new XSSFWorkbook();
//为工作簿创建工作表并命名
ISheet sheet = workbook.CreateSheet("商品表");
IDataFormat format = workbook.CreateDataFormat();
#region 表头及样式
int cellIndex = 0;
IRow headerRow = sheet.CreateRow(0);
for (int i = 0; i < dtSource.Columns.Count; i++)
{
//设置行高
headerRow.HeightInPoints = 35;
headerRow.CreateCell(cellIndex).SetCellValue(dtSource.Columns[i].ToString());
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.WrapText = true;
IFont font = workbook.CreateFont();
//字体大小
font.FontHeightInPoints = 12;
font.Boldweight = 360;
headStyle.SetFont(font);
headerRow.GetCell(cellIndex).CellStyle = headStyle;
cellIndex++;
}
#endregion
#region 数据填充
int rowIndex = 1;//行数一定要从1行开始,因为上面已经创建了表头为0行;
DataView dvSource = dtSource.DefaultView;
foreach (DataRow row in dtSource.Rows)
{
int ColumnIndex = 0;
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
//序号
ICell newCel0 = dataRow.CreateCell(ColumnIndex);
ICellStyle style0 = workbook.CreateCellStyle();
style0.DataFormat = format.GetFormat("text");//数据类型
newCel0.SetCellValue(row[column.ColumnName].ToString());
ColumnIndex++;
}
rowIndex++;
}
#endregion
#region 保存到指定位置
MemoryStream stream = new MemoryStream();
workbook.Write(stream);
var buf = stream.ToArray();
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, 0, buf.Length);
fs.Flush();
}
#endregion
}
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持编程网。