C#获取Excel文件所有文本数据内容的示例代码

public string getExcelContent(string _filename)
{
			Object Nothing=System.Reflection.Missing.Value;
 
			string _txtfile="",_path=Path.GetDirectoryName(_filename)+"\\",_ext="";
			if(!Directory.Exists(_path))
			{
				Directory.CreateDirectory(_path);
			}
 
		
			_txtfile=_path+System.Guid.NewGuid()+".txt";
 
			object filename=_filename;
			//创建一个名为ExcelApp的组件对象
			DateTime beforetime=DateTime.Now;
			Excel.Application excel=new Excel.Application();
			
			excel.DisplayAlerts=false;
			excel.AskToUpdateLinks=false;
 
			excel.Visible=true;
			
			DateTime aftertime=DateTime.Now;
 
			Excel.Workbook xb=excel.Workbooks.Add(filename);
			Worksheet worksheet = (Worksheet) excel.ActiveSheet;
			sheetCount=excel.Sheets.Count;
			worksheet.Activate();
			
 
			worksheet.SaveAs(@_txtfile,XlFileFormat.xlUnicodeText, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value); 
			FileEx fe=new FileEx();
			excel.Workbooks.Close();
			string rv=fe.LoadFromFile(@_txtfile,Encoding.Unicode);
			File.Delete(@_txtfile);
 
 
 
			excel.Quit();
 
			if(worksheet != null)
			{
				System.Runtime.InteropServices.Marshal.ReleaseComObject(worksheet);
				worksheet = null;
			}
			if(xb != null)
			{
				System.Runtime.InteropServices.Marshal.ReleaseComObject(xb);
				xb = null;
			}
			if(excel != null)
			{
				System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
				excel = null;
			}
			GC.Collect();
			
 
			KillProcessByStartTime("EXCEL",beforetime,aftertime);
			return rv;
}
public string KillProcessByStartTime(string processName,DateTime beforetime,DateTime aftertime)
{
			Process[] ps = Process.GetProcesses();
			foreach (Process p in ps)  
			{
				if(p.ProcessName.ToUpper()!=processName) continue;
 
				if(p.StartTime > beforetime && p.StartTime < aftertime)
				{
					try
					{
						p.Kill();
					}
					catch(Exception e)
					{
						return e.Message;
					}
				}
			}  
			return "";
}