C#强制关闭Excel进程（通过COM使用Excel时）

public class ExcelInstances
{
private static Microsoft.Office.Interop.Excel.Application m_excelApp = null ;
private static Microsoft.Office.Interop.Excel.Workbooks m_excelWorkBooks = null ;

[DllImport( " User32.dll " )]
public static extern int GetWindowThreadProcessId(IntPtr hWnd, out int Processid);

private ExcelInstances()
{
}



// 初始化ExcelInstances后，生成相应的COM实例

private static void Init()
{
if (m_excelApp == null )
{
m_excelApp = new Microsoft.Office.Interop.Excel.Application();
m_excelApp.DisplayAlerts = false ;
m_excelApp.AlertBeforeOverwriting = false ;
}

if (m_excelWorkBooks == null )
{
if (m_excelApp != null )
{
m_excelWorkBooks = m_excelApp.Workbooks;
}
}
}



// 辅助功能-获取当前系统中Excel的进程数

public static int GetExcelProcessCount()
{
int iReturn = 0 ;
System.Diagnostics.Process[] pProcesses = null ;

try
{
pProcesses = System.Diagnostics.Process.GetProcesses();

foreach (System.Diagnostics.Process p in pProcesses)
{
if ( string .Equals(p.ProcessName.ToString(), " EXCEL " ))
{
iReturn ++ ;
}
}
}
catch (Exception e)
{
throw e;
}

return iReturn;
}



// 强行关闭指定的Excel进程

public static void Kill(Microsoft.Office.Interop.Excel.Application theApp)
{
int iId = 0 ;
IntPtr intptr = new IntPtr(theApp.Hwnd);
System.Diagnostics.Process p = null ;

try
{
GetWindowThreadProcessId(intptr, out iId);
p = System.Diagnostics.Process.GetProcessById(iId);

if (p != null )
{
p.Kill();
p.Dispose();
}

}
catch (Exception e)
{
throw e;
}
}

private static ExcelInstances _objInstances = null ;



// 获得一个ExcelInstances 的实例

public static ExcelInstances GetInstances()
{
if (_objInstances == null )
{
_objInstances = new ExcelInstances();
}

Init();

return _objInstances;
}

// 按照文件名获得指定的workbook
public Microsoft.Office.Interop.Excel.Workbook GetWorkBook( string strFileName)
{
return m_excelWorkBooks.Add(strFileName);
}

// 关闭workbook
public void Close()
{
try
{
if (m_excelWorkBooks != null )
{
m_excelWorkBooks.Close();
System.Runtime.InteropServices.Marshal.ReleaseComObject(m_excelWorkBooks);
m_excelWorkBooks = null ;
}

if (m_excelApp != null )
{
m_excelApp.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(m_excelApp);
m_excelApp = null ;
}
}
catch (Exception e)
{
throw e;
}
}
}