ADO缺省情况下当然是Apartment线程模型。 If you are using this in IIS and ADO is only being used at page scope then it should be fine. If you are using it at the session or application level then you will need to mark it as both.
那么怎么改为Both呢？
可能就是改一下注册表里面的线程模型。
在
C:\Program Files\Common Files\System\ado
文件夹下，有两个reg文件，很有趣，可能就是这个意思。
ADOFRE15.REG
ADOAPT15.REG
其中，ADOFRE15.REG就是这个内容：
REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000507-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000514-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0000050B-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000535-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000541-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
okay, you''''ll see that the ThreadingModel is adjusted for the following coclasses: 1. Command 2. Connection 3. Parameter 4. Recordset 5. Error If the threading model selected is "Apartment" (the default), then the objects listed above can be accessed only by the thread created it. If threading model is "Both" and the object is created in an STA, then all access to it will through the single thread that runs in the STA. If threading model is "Both" and the object is created in an MTA, then any thread in this MTA will have direct access to it. If the objects integrate FTM (I don''''t know whether ADO does this or not), then different threads in different apartments will have direct access to the objects (without proxies).
或者参见权威的微软文档：
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconvisualbasiclanguagechanges.asp
You can configure ADO.NET to use the free-threaded model by importing the following registry data. To modify the registry, copy this data to a REG file (such as Adofre.reg) and import it using the Regedit.exe program (for example, Regedit /s Adofre.reg).
The following registry information is included on Windows 2000 and Windows Server 2003 systems in the Adofre15.reg file. The batch file Makfre15.bat updates the registry with the information in Adofre15.reg. Both files are located in Program Files\Common Files\System\ado\. REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000507-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000514-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0000050B-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000535-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000541-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Both"
If you do not plan to use ADO.NET from ASP.NET applications, you can use the apartment threading model for better ADO.NET performance with legacy applications such as those created with Visual Basic version 6. You can configure apartment threading by importing the following registry data. To modify the registry, copy this data to a REG file (such as Adoapt.reg) and import it using the Regedit.exe program.
The following registry information is included on Windows 2000 and Windows Server 2003 systems in the Adoapt15.reg file. The Makapt15.bat batch file updates the registry with the information in Adoapt15.reg. Both files are located in \Program Files\Common Files\System\ado\. REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000507-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Apartment"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000514-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Apartment"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0000050B-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Apartment"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000535-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Apartment"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000541-0000-0010-8000-00AA006D2EA4}\InprocServer32]
"ThreadingModel"="Apartment"
或者参见：
http://www.faqchest.com/msdn/DCOM/dcom-00/dcom-0011/dcom00112713_21236.html
Date: Mon, 27 Nov 2000 13:31:04 -0500
From: Hitesh Mittal <[PRIVACY PROTECTION]>
Subject: Re: Changing threading model of ADO.
go to c:\programfiles\common files\system\ado
you should see adoapt15.reg and adofre15.reg. Run one of these to register
Apartment or Both.
There is nothing wrong in changing the apartment model to Both, the objects
will be created in the same apartment as the thread is initialized with.
Hitesh Mittal
感谢Alex Matevossian和Jim Cirone。
Zhengyun (at) tomosoft.com 收藏。
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