Generics in .net 2.0

[Søren Reinke]

Hi there

I have a problem, with key/value pairs in web.config.

The value is sometimes a boolean, sometimes an integer and sometimes a
string and so on.

Do i need to make a method for each type ?
Or can i use generics ?

I would like to be able to do something like:

Integer age=getConfigValue("KeyName",17); //name,default value if something
fails)
Boolean productionServer=getConfigValue("onProductionServe r",false);

And more like that.
--
Best regards C.T.O. Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net. Download it in PDF
Aug-sept issue of X-RAY Magazine is ready to download:
EGYPT Finding Yolanda Wreck, Celebrate the Seas 2005

[billr]

Personally, I would create an accessor for each type I expect to get out of
the .config file ...

GetInt()
GetDouble()
GetBoolean()

etc.

have a look at the post "Reccomended ways of saving WinForms' "viewstate"?"
in group "microsoft.public.dotnet.framework.windowsform s" for a sample
..config file reader/writer
--
Of all words of tongue and pen, the saddest are: "It might have been"

Bill.Richards @ greyskin .co .uk
http://greyskin.co.uk
"Søren Reinke" wrote:

Hi there

I have a problem, with key/value pairs in web.config.

The value is sometimes a boolean, sometimes an integer and sometimes a
string and so on.

Do i need to make a method for each type ?
Or can i use generics ?

I would like to be able to do something like:

Integer age=getConfigValue("KeyName",17); //name,default value if something
fails)
Boolean productionServer=getConfigValue("onProductionServe r",false);

And more like that.
--
Best regards C.T.O. Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net. Download it in PDF
Aug-sept issue of X-RAY Magazine is ready to download:
EGYPT Finding Yolanda Wreck, Celebrate the Seas 2005

[Søren Reinke]

"billr" <bi***@discussions.microsoft.com> wrote in message
news:37**********************************@microsof t.com...

Personally, I would create an accessor for each type I expect to get out
of
the .config file ...

GetInt()
GetDouble()
GetBoolean()
That is what i have done, just interested in knowing if it was possible to
do in Generics.
--
Best regards C.T.O. Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net. Download it in PDF
Aug-sept issue of X-RAY Magazine is ready to download:
EGYPT Finding Yolanda Wreck, Celebrate the Seas 2005

etc.

have a look at the post "Reccomended ways of saving WinForms'
"viewstate"?"
in group "microsoft.public.dotnet.framework.windowsform s" for a sample
.config file reader/writer
--
Of all words of tongue and pen, the saddest are: "It might have been"

Bill.Richards @ greyskin .co .uk
http://greyskin.co.uk
"Søren Reinke" wrote:

Hi there

I have a problem, with key/value pairs in web.config.

The value is sometimes a boolean, sometimes an integer and sometimes a
string and so on.

Do i need to make a method for each type ?
Or can i use generics ?

I would like to be able to do something like:

Integer age=getConfigValue("KeyName",17); //name,default value if
something
fails)
Boolean productionServer=getConfigValue("onProductionServe r",false);

And more like that.
--
Best regards C.T.O. Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net. Download it in
PDF
Aug-sept issue of X-RAY Magazine is ready to download:
EGYPT Finding Yolanda Wreck, Celebrate the Seas 2005

[Nicholas Paldino [.NET/C# MVP]]

Søren,

You should be able to use generics here, on the method level. You could
declare the method as:

// Name it GetConfigValue, not getConfigValue, since
// it is a violation of the public naming guidelines.
public T GetConfigValue<T>(string key, T defaultValue)
{
// Get the value here, it should be returned as an object.
object retVal = ...;

// Cast the return value.
return (T) retVal;
}

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Søren Reinke" <so***@reinke.fjernmig.dk> wrote in message
news:de**********@newsbin.cybercity.dk...

"billr" <bi***@discussions.microsoft.com> wrote in message
news:37**********************************@microsof t.com...

Personally, I would create an accessor for each type I expect to get out
of
the .config file ...

GetInt()
GetDouble()
GetBoolean()

That is what i have done, just interested in knowing if it was possible to
do in Generics.
--
Best regards C.T.O. Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net. Download it in
PDF
Aug-sept issue of X-RAY Magazine is ready to download:
EGYPT Finding Yolanda Wreck, Celebrate the Seas 2005

etc.

have a look at the post "Reccomended ways of saving WinForms'
"viewstate"?"
in group "microsoft.public.dotnet.framework.windowsform s" for a sample
.config file reader/writer
--
Of all words of tongue and pen, the saddest are: "It might have been"

Bill.Richards @ greyskin .co .uk
http://greyskin.co.uk
"Søren Reinke" wrote:

Hi there

I have a problem, with key/value pairs in web.config.

The value is sometimes a boolean, sometimes an integer and sometimes a
string and so on.

Do i need to make a method for each type ?
Or can i use generics ?

I would like to be able to do something like:

Integer age=getConfigValue("KeyName",17); //name,default value if
something
fails)
Boolean productionServer=getConfigValue("onProductionServe r",false);

And more like that.
--
Best regards C.T.O. Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net. Download it in
PDF
Aug-sept issue of X-RAY Magazine is ready to download:
EGYPT Finding Yolanda Wreck, Celebrate the Seas 2005

[Ted Miller]

Be careful with that approach. If retVal is (for example) a boxed int, the
cast will throw an exception if T is anything other than int.

To really make this approach work, conversions are required.

I think this is not really a good application for generics.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:uF**************@TK2MSFTNGP12.phx.gbl...

Søren,

You should be able to use generics here, on the method level. You
could declare the method as:

// Name it GetConfigValue, not getConfigValue, since
// it is a violation of the public naming guidelines.
public T GetConfigValue<T>(string key, T defaultValue)
{
// Get the value here, it should be returned as an object.
object retVal = ...;

// Cast the return value.
return (T) retVal;
}

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Søren Reinke" <so***@reinke.fjernmig.dk> wrote in message
news:de**********@newsbin.cybercity.dk...

"billr" <bi***@discussions.microsoft.com> wrote in message
news:37**********************************@microsof t.com...

Personally, I would create an accessor for each type I expect to get out
of
the .config file ...

GetInt()
GetDouble()
GetBoolean()

That is what i have done, just interested in knowing if it was possible
to do in Generics.
--
Best regards C.T.O. Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net. Download it in
PDF
Aug-sept issue of X-RAY Magazine is ready to download:
EGYPT Finding Yolanda Wreck, Celebrate the Seas 2005

etc.

have a look at the post "Reccomended ways of saving WinForms'
"viewstate"?"
in group "microsoft.public.dotnet.framework.windowsform s" for a sample
.config file reader/writer
--
Of all words of tongue and pen, the saddest are: "It might have been"

Bill.Richards @ greyskin .co .uk
http://greyskin.co.uk
"Søren Reinke" wrote:

Hi there

I have a problem, with key/value pairs in web.config.

The value is sometimes a boolean, sometimes an integer and sometimes a
string and so on.

Do i need to make a method for each type ?
Or can i use generics ?

I would like to be able to do something like:

Integer age=getConfigValue("KeyName",17); //name,default value if
something
fails)
Boolean productionServer=getConfigValue("onProductionServe r",false);

And more like that.
--
Best regards C.T.O. Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net. Download it in
PDF
Aug-sept issue of X-RAY Magazine is ready to download:
EGYPT Finding Yolanda Wreck, Celebrate the Seas 2005

[Søren Reinke]

"Ted Miller" <te*@millerzone.net> wrote in message
news:11*************@corp.supernews.com...

Be careful with that approach. If retVal is (for example) a boxed int, the
cast will throw an exception if T is anything other than int.

To really make this approach work, conversions are required.

I think this is not really a good application for generics.

Okay, i'll just stick to 1 method per type :)
--
Best regards C.T.O. Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net. Download it in PDF
Aug-sept issue of X-RAY Magazine is ready to download:
EGYPT Finding Yolanda Wreck, Celebrate the Seas 2005