关于C#调用autoCad单件模式的使用

之前在开发的过程中，生成一个文件后，再用cad打开时，提示被占用，只能以只读方式打开，有点不方便，所以改了下代码，利用了设计模式中的单件模式，当然，这个是为了在开发过程中的便利而设计的，不管怎么说，花了点时间去实现了，记录下呗......

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text;
usingAutodesk.AutoCAD.Interop;
usingAutodesk.AutoCAD.Interop.Common;
usingSystem.Runtime.InteropServices;

namespaceMode
{

publicclassAutoCADCon:IDisposable
{
privatestaticAutoCADConautocadcon;
privatestaticAcadApplication_application;
privatestaticbool_initialized;
privatestaticbool_disposed;

privatestaticbool_created=false;

privateAutoCADCon()
{
autocadcon=this;
_created=true;
_disposed=false;
try
{
_application=newAcadApplication();
_initialized=true;
}
catch
{
throw;
}
}

publicstaticAutoCADCongetInstance()
{
if(!_created)
{
autocadcon=newAutoCADCon();
}
returnautocadcon;
}

//Iftheuserdoesn'tcallDispose,the
//garbagecollectorwillupondestruction
~AutoCADCon()
{
try
{
_application.Quit();
Dispose(false);
}
catch{}
}

publicAcadApplicationApplication
{
get
{
return_application;
}
}
//Thisistheuser-callableversionofDispose.
//Itcallsourinternalversionandremovesthe
//objectfromthegarbagecollector'squeue.

publicvoidDispose()
{
Dispose(false);
GC.SuppressFinalize(this);
}

//ThisversionofDisposegetscalledbyour
//destructor.

protectedvirtualvoidDispose(booldisposing)
{
//IfwecreatedourAutoCADinstance,callits
//Quitmethodtoavoidleakingmemory.

if(!_disposed&&_initialized)
{
_application.Quit();
}
_disposed=true;
_created=false;
}
}
}