asp.net将ppt文档转换成pdf

///<summary>        
/// 把PowerPoint文件转换成PDF格式文件       
///</summary>        
///<param name="sourcePath">源文件路径</param>     
///<param name="targetPath">目标文件路径</param> 
///<returns>成功返回true,失败返回false</returns> 
    public static bool PPTConvertToPDF(string sourcePath, string targetPath)
{
bool result;
        PpSaveAsFileType ppSaveAsFileType = PpSaveAsFileType.ppSaveAsPDF;//转换成pdf
        object missing = Type.Missing;
        Microsoft.Office.Interop.PowerPoint.ApplicationClass application = null;
        Presentation persentation = null;
try
{
            application = new Microsoft.Office.Interop.PowerPoint.ApplicationClass();
            persentation = application.Presentations.Open(sourcePath, MsoTriState.msoTrue, MsoTriState.msoFalse, MsoTriState.msoFalse);
if (persentation!=null)
{
                persentation.SaveAs(targetPath, ppSaveAsFileType, MsoTriState.msoTrue);
            }
            result = true;
        }
catch
{
            result = false;
        }
finally
{
if (persentation != null)
{
                persentation.Close();
                persentation = null;
            }
if (application != null)
{
                application.Quit();
                application = null;
            }
        }
return result;
    }