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�����ṩһ������Excel���࣬�����ṩ��4�������������������������롣����ͨ��DataSet����ӵ�ж��Sheet��Excel�ļ���Ҳ����ͨ��DataTable����ӵ��һ��Sheet��Excel������Ҳ��һ����ͨ��ָ��Sheet����������DataTable������ֱ�ӵ�������Sheet����һ��DataSet��
public class ExcelHelper
{
/// <summary>
/// ����Excel��Sheet����DataTable
/// </summary>
/// <param name="filePath">Excel�ļ���ַ</param>
/// <param name="sheetIndex">Sheet����</param>
/// <returns>DataTable</returns>
public static DataTable GetDataTable(string filePath, int sheetIndex)
{
return GetDataSet(filePath, sheetIndex).Tables[0];
}
/// <summary>
/// ����Excel����DataSet
/// </summary>
/// <param name="filePath">Excel�ļ���ַ</param>
/// <param name="sheetIndex">Sheet��������ѡ��Ĭ�Ϸ�������Sheet</param>
/// <returns>DataSet</returns>
public static DataSet GetDataSet(string filePath, int? sheetIndex = null)
{
DataSet ds = new DataSet();
IWorkbook fileWorkbook;
using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
if (filePath.Last() == 's')
{
try
{
fileWorkbook = new HSSFWorkbook(fs);
}
catch (Exception ex)
{
throw ex;
}
}
else
{
try
{
fileWorkbook = new XSSFWorkbook(fs);
}
catch
{
fileWorkbook = new HSSFWorkbook(fs);
}
}
}
for (int i = 0; i < fileWorkbook.NumberOfSheets; i++)
{
if (sheetIndex != null && sheetIndex != i)
continue;
DataTable dt = new DataTable();
ISheet sheet = fileWorkbook.GetSheetAt(i);
//��ͷ
IRow header = sheet.GetRow(sheet.FirstRowNum);
List<int> columns = new List<int>();
for (int j = 0; j < header.LastCellNum; j++)
{
object obj = GetValueTypeForXLS(header.GetCell(j) as HSSFCell);
if (obj == null || obj.ToString() == string.Empty)
{
dt.Columns.Add(new DataColumn("Columns" + j.ToString()));
}
else
dt.Columns.Add(new DataColumn(obj.ToString()));
columns.Add(j);
}
//����
IEnumerator rows = sheet.GetEnumerator();
while (rows.MoveNext())
{
int j = sheet.FirstRowNum + 1;
DataRow dr = dt.NewRow();
bool hasValue = false;
foreach (int K in columns)
{
dr[K] = GetValueTypeForXLS(sheet.GetRow(K).GetCell(K) as HSSFCell);
if (dr[K] != null && dr[K].ToString() != string.Empty)
{
hasValue = true;
}
}
if (hasValue)
{
dt.Rows.Add(dr);
}
j++;
}
ds.Tables.Add(dt);
}
return ds;
}
/// <summary>
/// ����DataTable����Excel
/// </summary>
/// <param name="dt">DataTable</param>
/// <param name="file">�����ַ</param>
public static void GetExcelByDataTable(DataTable dt, string file)
{
DataSet ds = new DataSet();
ds.Tables.Add(dt);
GetExcelByDataSet(ds, file);
}
/// <summary>
/// ����DataSet����Excel
/// </summary>
/// <param name="ds">DataSet</param>
/// <param name="file">�����ַ</param>
public static void GetExcelByDataSet(DataSet ds, string file)
{
IWorkbook fileWorkbook = new HSSFWorkbook();
int index = 0;
foreach (DataTable dt in ds.Tables)
{
index++;
ISheet sheet = fileWorkbook.CreateSheet("Sheet" + index);
//��ͷ
IRow row = sheet.CreateRow(0);
for (int i = 0; i < dt.Columns.Count; i++)
{
ICell cell = row.CreateCell(i);
cell.SetCellValue(dt.Columns[i].ColumnName);
}
//����
for (int i = 0; i < dt.Rows.Count; i++)
{
IRow row1 = sheet.CreateRow(i + 1);
for (int j = 0; j < dt.Columns.Count; j++)
{
ICell cell = row1.CreateCell(j);
cell.SetCellValue(dt.Rows[i][j].ToString());
}
}
}
//תΪ�ֽ�����
MemoryStream stream = new MemoryStream();
fileWorkbook.Write(stream);
var buf = stream.ToArray();
//����ΪExcel�ļ�
using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, 0, buf.Length);
fs.Flush();
}
}
/// <summary>
/// ���ݵ�Ԫ�����ݷ���Ϊ��Ӧ���͵�����
/// </summary>
/// <param name="cell">��Ԫ��</param>
/// <returns>����</returns>
private static object GetValueTypeForXLS(HSSFCell cell)
{
if (cell == null)
return null;
switch (cell.CellType)
{
case CellType.Blank: //BLANK:
return null;
case CellType.Boolean: //BOOLEAN:
return cell.BooleanCellValue;
case CellType.Numeric: //NUMERIC:
return cell.NumericCellValue;
case CellType.String: //STRING:
return cell.StringCellValue;
case CellType.Error: //ERROR:
return cell.ErrorCellValue;
case CellType.Formula: //FORMULA:
default:
return "=" + cell.CellFormula;
}
}
}
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