DataSet、Excel、XML之间的导入导出

class ImportExportToExcel
{
public class ImportExportToExcel
{
private string strConn;

private System.Windows.Forms.OpenFileDialog openFileDlg = new System.Windows.Forms.OpenFileDialog();
private System.Windows.Forms.SaveFileDialog saveFileDlg = new System.Windows.Forms.SaveFileDialog();

public ImportExportToExcel()
{
//
// TODO: 在此处添加构造函数逻辑
//
this.openFileDlg.DefaultExt = "xls";
this.openFileDlg.Filter = "Excel文件 (*.xls)|*.xls";
this.saveFileDlg.DefaultExt = "xls";
this.saveFileDlg.Filter = "Excel文件 (*.xls)|*.xls";

}

#region 从Excel文件导入到DataSet
/**/
/// <summary>
/// 从选择的Excel文件导入
/// </summary>
/// <returns>DataSet</returns>
public DataSet ImportFromExcel()
{
DataSet ds = new DataSet();
if (openFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
ds = doImport(openFileDlg.FileName);
return ds;
}
/**/
/// <summary>
/// 从指定的Excel文件导入
/// </summary>
/// <param name="strFileName">Excel文件名</param>
/// <returns></returns>
public DataSet ImportFromExcel(string strFileName)
{
DataSet ds = new DataSet();
ds = doImport(strFileName);
return ds;
}
/**/
/// <summary>
/// 执行导入
/// </summary>
/// <param name="strFileName">文件名</param>
/// <returns>DataSet</returns>
private DataSet doImport(string strFileName)
{
if (strFileName == "") return null;

strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=" + strFileName + ";" +
"Extended Properties=Excel 8.0;";
OleDbDataAdapter ExcelDA = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", strConn);
DataSet ExcelDs = new DataSet();
try
{
ExcelDA.Fill(ExcelDs, "ExcelInfo");

}
catch (Exception err)
{
System.Console.WriteLine(err.ToString());
}
return ExcelDs;

}
#endregion

#region 从DataSet导出到Excel
/**/
/// <summary>
/// 导出指定的Excel文件
/// </summary>
/// <param name="ds">要导出的DataSet</param>
/// <param name="strExcelFileName">要导出的Excel文件名</param>
public void ExportToExcel(DataSet ds, string strExcelFileName)
{
if (ds.Tables.Count == 0 || strExcelFileName == "") return;
doExport(ds, strExcelFileName);

}
/**/
/// <summary>
/// 导出用户选择的Excel文件
/// </summary>
/// <param name="ds">DataSet</param>
public void ExportToExcel(DataSet ds)
{
if (saveFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
doExport(ds, saveFileDlg.FileName);

}
/**/
/// <summary>
/// 执行导出
/// </summary>
/// <param name="ds">要导出的DataSet</param>
/// <param name="strExcelFileName">要导出的文件名</param>
private void doExport(DataSet ds, string strExcelFileName)
{

Excel.Application excel = new Excel.Application();

//            Excel.Workbook obj=new Excel.WorkbookClass();
//            obj.SaveAs("c:/zn.xls",Excel.XlFileFormat.xlExcel9795,null,null,false,false,Excel.XlSaveAsAccessMode.xlNoChange,null,null,null,null);

int rowIndex = 1;
int colIndex = 0;
excel.Application.Workbooks.Add(true);

System.Data.DataTable table = ds.Tables[0];
foreach (DataColumn col in table.Columns)
{
colIndex++;
excel.Cells[1, colIndex] = col.ColumnName;
}

foreach (DataRow row in table.Rows)
{
rowIndex++;
colIndex = 0;
foreach (DataColumn col in table.Columns)
{
colIndex++;
excel.Cells[rowIndex, colIndex] = row[col.ColumnName].ToString();
}
}
excel.Visible = false;
excel.Sheets[0] = "sss";
excel.ActiveWorkbook.SaveAs(strExcelFileName + ".XLS", Excel.XlFileFormat.xlExcel9795, null, null, false, false, Excel.XlSaveAsAccessMode.xlNoChange, null, null, null, null);

//wkbNew.SaveAs strBookName

//excel.Save(strExcelFileName);
excel.Quit();
excel = null;

GC.Collect();//垃圾回收
}
#endregion

#region 从XML导入到Dataset
/**/
/// <summary>
/// 从选择的XML文件导入
/// </summary>
/// <returns>DataSet</returns>
public DataSet ImportFromXML()
{
DataSet ds = new DataSet();
System.Windows.Forms.OpenFileDialog openFileDlg = new System.Windows.Forms.OpenFileDialog();
openFileDlg.DefaultExt = "xml";
openFileDlg.Filter = "xml文件 (*.xml)|*.xml";
if (openFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
try { ds.ReadXml(openFileDlg.FileName, System.Data.XmlReadMode.ReadSchema); }
catch { }
return ds;
}
/**/
/// <summary>
/// 从指定的XML文件导入
/// </summary>
/// <param name="strFileName">XML文件名</param>
/// <returns></returns>
public DataSet ImportFromXML(string strFileName)
{
if (strFileName == "")
return null;
DataSet ds = new DataSet();
try { ds.ReadXml(strFileName, System.Data.XmlReadMode.ReadSchema); }
catch { }
return ds;
}

#endregion

#region 从DataSet导出到XML
/**/
/// <summary>
/// 导出指定的XML文件
/// </summary>
/// <param name="ds">要导出的DataSet</param>
/// <param name="strXMLFileName">要导出的XML文件名</param>
public void ExportToXML(DataSet ds, string strXMLFileName)
{
if (ds.Tables.Count == 0 || strXMLFileName == "") return;
doExportXML(ds, strXMLFileName);
}
/**/
/// <summary>
/// 导出用户选择的XML文件
/// </summary>
/// <param name="ds">DataSet</param>
public void ExportToXML(DataSet ds)
{
System.Windows.Forms.SaveFileDialog saveFileDlg = new System.Windows.Forms.SaveFileDialog();
saveFileDlg.DefaultExt = "xml";
saveFileDlg.Filter = "xml文件 (*.xml)|*.xml";
if (saveFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
doExportXML(ds, saveFileDlg.FileName);
}

/**/
/// <summary>
/// 执行导出
/// </summary>
/// <param name="ds">要导出的DataSet</param>
/// <param name="strExcelFileName">要导出的XML文件名</param>
private void doExportXML(DataSet ds, string strXMLFileName)
{
try
{ ds.WriteXml(strXMLFileName, System.Data.XmlWriteMode.WriteSchema); }
catch (Exception ex)
{ System.Windows.Forms.MessageBox.Show(ex.Message, "Errol"); }
}

#endregion
}

//可能用进程的强制删除方法:kill()
#region "强制结束Word进程(垃圾回收)"
/// <summary>
/// 强制结束Word进程(垃圾回收)
/// </summary>
public void KillWordProcess()
{
int ProceedingCount = 0;
try
{
System.Diagnostics.Process[] ProceddingCon = System.Diagnostics.Process.GetProcesses();
foreach (System.Diagnostics.Process IsProcedding in ProceddingCon)
{
if (IsProcedding.ProcessName.ToUpper() == "WINWORD")
{
ProceedingCount += 1;
IsProcedding.Kill();
}
}
}
catch (System.Exception err)
{
MessageBox.Show(err.Message + "/r" + "(" + err.Source + ")" + "/r" + err.StackTrace);
}
}
#endregion
}
关于Excel进程一直驻留的，参考： http://support.microsoft.com/?scid=kb;zh-cn;317109&spid=1108&sid=152