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How can I check whether .NET Framwork 2.0 is installed or not?

Posted on 2007-11-27
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Last Modified: 2010-04-05
Hi,

How can I check whether .NET Framwork 2.0 is installed or not through a Win32 Delphi app?

Thanks.
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Question by:EEssam
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10 Comments
 
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Expert Comment

by:unassassinable
ID: 20360305
In control pannel open "add/Remove programs"  the list is in alphabetic order.  Look for Microsoft .Net Framwork
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Expert Comment

by:unassassinable
ID: 20360313
or I could finnish reading the entire question before I hit post...sorry didnt notice the "a Win32 Delphi app?" part.  
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LVL 9

Expert Comment

by:mystics7
ID: 20360329
The NET runtime installs a registry key, you can check it.

For example,
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramewor k\policy\v1.1

for version 1.1.

http://msdn2.microsoft.com/en-us/library/ydh6b3yb.aspx
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Expert Comment

by:mystics7
ID: 20360335
i should have done the same thing.... finish reading!!!!!
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Accepted Solution

by:
Johnjces earned 500 total points
ID: 20360906
Here is some Delphi code in a button click event.

uses
  Regsitry;
procedure TForm1.Button1Click(Sender: TObject);

var

 Reg : TRegistry;

begin

 Reg := TRegistry.Create;

 Reg.RootKey := HKEY_LOCAL_MACHINE; 

 if Reg.KeyExists('\SOFTWARE\Microsoft\.NETFramework\policy\v1.1') then

  ShowMessage('.NET version 1.1 Found');

 if Reg.KeyExists('\SOFTWARE\Microsoft\.NETFramework\policy\v2.0') then

  ShowMessage('.NET version 2.0 Found');

 if Reg.KeyExists('\SOFTWARE\Microsoft\.NETFramework\policy\v3.0') then

  ShowMessage('.NET version 3.0 Found');

 Reg.Free; 

end;

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LVL 18

Expert Comment

by:Johnjces
ID: 20360910
I have got to check my spelling!

uses
 Registry;

John
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Author Comment

by:EEssam
ID: 20361274
Thanks, it worked but why you're checking "policy" folder not just:

\SOFTWARE\Microsoft\.NETFramework\vXXX

?
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LVL 18

Expert Comment

by:Johnjces
ID: 20361887
Because there is no key there, that I can find, with that designator, I.E.,

\SOFTWARE\Microsoft\.NETFramework\v1.1 does not exist.

Those keys are listed under policy,

SOFTWARE\Microsoft\.NETFramework\policy\v1.1 and does exist.

John
0
 

Author Comment

by:EEssam
ID: 20366609
Are you sure you don't have the key? I have it:

\SOFTWARE\Microsoft\.NETFramework\v1.1.4322

Please check it again.
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LVL 18

Expert Comment

by:Johnjces
ID: 20366973
I do not on my PC here. But I do have

\SOFTWARE\Microsoft\.NETFramework\2.0.40607
and
\SOFTWARE\Microsoft\.NETFramework\2.0.40903
and
\SOFTWARE\Microsoft\.NETFramework\2.0.50727

You should still have the core version listed under policy and I believe that is what you were seeking.

John
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