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Anyone has expereince Com Interop in .NET using c#? I got some problems when I try to release a COM object using Marshal.ReleaseComObject.

graceye88(叶子)

I used two Com interop object in my method and one of them has to call some function to do some initilizeing by passing in the other com object. I declared the object as following:

B2K_Server2.clsAppBroker Broker = new B2K_Server2.clsAppBroker();
B2K_Server2.clsBLL_RequisitionClass objReq = new B2K_Server2.clsBLL_RequisitionClass();

objReq.Init(ref Broker);

I release them like this:

Marshal.ReleaseComObject(Broker);
Marshal.ReleaseComObject(objReq);

However, after the process is finished, I found the object objReq is released but Broker is not released. I think the problem is the way to declare the variable is different . Borker is using the original class from COM and the objReq is declared using the class the RCW generated. However, I cannot decalre the broker in the same way otherewise the
objReq.Init(ref Broker) will generate an error because of the different type of argument.
Anyone know how I can solve this problem?

Thanks in advance!

(#2991289@0)
Last Updated: 2006-5-25
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工作学习 / 专业技术讨论 / Anyone has expereince Com Interop in .NET using c#? I got some problems when I try to release a COM object using Marshal.ReleaseComObject. -graceye88(叶子); 2006-5-25 {983} (#2991289@0)
I used two Com interop object in my method and one of them has to call some function to do some initilizeing by passing in the other com object. I declared the object as following:

B2K_Server2.clsAppBroker Broker = new B2K_Server2.clsAppBroker();
B2K_Server2.clsBLL_RequisitionClass objReq = new B2K_Server2.clsBLL_RequisitionClass();

objReq.Init(ref Broker);

I release them like this:

Marshal.ReleaseComObject(Broker);
Marshal.ReleaseComObject(objReq);

However, after the process is finished, I found the object objReq is released but Broker is not released. I think the problem is the way to declare the variable is different . Borker is using the original class from COM and the objReq is declared using the class the RCW generated. However, I cannot decalre the broker in the same way otherewise the
objReq.Init(ref Broker) will generate an error because of the different type of argument.
Anyone know how I can solve this problem?

Thanks in advance!

I think that is because the Broker is ref, which can not be released in this way. -42channel(Channel); 2006-5-25 (#2991359@0)

Yes. I think that is the problem. I don't know how I can release a Com object like that. Do you have any good suggestion. -graceye88(叶子); 2006-5-26 (#2992276@0)

I don't think 'ReleaseComObject' really matters here. The interface must be leaked somewhere else. -yuxiliu(Nescafe); 2006-5-26 (#2992721@0)

And I don't think you need to call "ReleaseComObject" unless you 1. want the objects to be released in a certain order. 2. someone statically holds a reference of your object somewhere in your code. -yuxiliu(Nescafe); 2006-5-26 (#2992727@0)

I am not sure if I have to. In my code, I have to create the object in page load. Sometimes I got the error: The callee (server [not server application]) is not available and disappeared; all connections are invalid. -graceye88(叶子); 2006-5-26 {138} (#2992954@0)
This happens very random.So I think it is better to release the object immedately rather than wait for Garbage collection to release it.

That's sounds like an automation error, as the message states, you are making calls on a already released object. -yuxiliu(Nescafe); 2006-5-26 {86} (#2993461@0)
I would suggest to investigate when and why the object you are calling become invalid.

@Calgary

Anyone has expereince Com Interop in .NET using c#? I got some problems when I try to release a COM object using Marshal.ReleaseComObject.

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