C# and COM+ Constuct

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

All,

I am trying to use the COM+ constructor string as follows:

[ConstructionEnabled (true)]
public sealed class xxxx: ServicedComponent
{

public override void Construct(string constructString)
{

}
{

But when I build the project I get the following error:

C:\xxx.cs(33): xxxxxx.Construct(string)': cannot change access modifiers
when overriding 'protected' inherited member
'System.EnterpriseServices.ServicedComponent.Construct(string)'

What am I doing wrong?

Thanks
Msuk
 
The 'Construct' method is defined as 'protected' in the ServicedComponent
class you can't change the access modifier in your derived class - this is
what the compiler error says...

You can't call this method externally from the class....

HTH

Ollie Riches
 
Hi,

All the examples show that you can have it as a public method e.g

http://www.ondotnet.com/pub/a/dotnet/excerpt/com_dotnet_ch10/?page=6

What should it be?

Thanks
Msuk

Ollie Riches said:
The 'Construct' method is defined as 'protected' in the ServicedComponent
class you can't change the access modifier in your derived class - this is
what the compiler error says...

You can't call this method externally from the class....

HTH

Ollie Riches

msuk said:
All,

I am trying to use the COM+ constructor string as follows:

[ConstructionEnabled (true)]
public sealed class xxxx: ServicedComponent
{

public override void Construct(string constructString)
{

}
{

But when I build the project I get the following error:

C:\xxx.cs(33): xxxxxx.Construct(string)': cannot change access modifiers
when overriding 'protected' inherited member
'System.EnterpriseServices.ServicedComponent.Construct(string)'

What am I doing wrong?

Thanks
Msuk
Click to expand...
Click to expand...
 
IIRC IObjectConstruct (the COM+ construction interface) has the signature

IObjectConstruct
{
HRESULT Construct(IDispatch* pCtorObj);
}

This is obviously not the same signature as the overridable Construct method from ServiceComponent. So ServicedComponent implements the interface and then it's implementation of IObjectConstruct::Construct calls a protected virtual Construct method which you can override. Thats why the Construct method you override is protected rather than public

Regards]

Richard Blewett - DevelopMentor
http://www.dotnetconsult.co.uk/weblog
http://www.dotnetconsult.co.uk

The 'Construct' method is defined as 'protected' in the ServicedComponent
class you can't change the access modifier in your derived class - this is
what the compiler error says...

You can't call this method externally from the class....

HTH

Ollie Riches
 
You can't change the access modifier (he, but that's what the compiler
say's..;-).

Change your method definition to:

protected override void Construct(string s) {
..

}

And don't forget that passing a string is done through the
ConstructionEnabledAttribute.

[ConstructionEnabled(Enabled=true, Default="Test string")]


Willy.
 
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