Hi:

This is probably a newby question however I can't figure it out!

I'm trying to use application data caching in a web application. I have
read an article on 4 guys from rolla that shows the following syntax:

Write:

Cache["key"] = value;

Read:

value = Cache["key"] - or - value = Cache.Get["key"]

I can save the value (or I think I can) with the "write" statement / I
am unable to get the values back with the "read":


I receive the compile message:

Cannot apply indexing with [] to an expression of type 'method group'

Does anyone know how to make this work?

Also: I would very much like to be able to read and update cache values
in a class library. I have added the reference System.Web.Caching
however this doesn't work - is there a way to do this?

Thanks very much!

Fred

when you pull items from the cache, they are "object"'s ... you may have to
cast it to the appropriate type.

object o = null;
if (null!=Cache["key"])
{
o = Cache["key"];
}
DataSet ds = o as DataSet;

if(null!=ds)
{
Console.Writeline(ds.GetXml());
}

That of course .. is if you put a dataset into the cache.

There is a "smarter" way to do this:


see
http://spaces.msn.com/sholliday/ 10/24/2005 entry

it would be trivial to change this from a Session to an Application holder.





"Fred Nelson" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi:
>
> This is probably a newby question however I can't figure it out!
>
> I'm trying to use application data caching in a web application. I have
> read an article on 4 guys from rolla that shows the following syntax:
>
> Write:
>
> Cache["key"] = value;
>
> Read:
>
> value = Cache["key"] - or - value = Cache.Get["key"]
>
> I can save the value (or I think I can) with the "write" statement / I
> am unable to get the values back with the "read":
>
>
> I receive the compile message:
>
> Cannot apply indexing with [] to an expression of type 'method group'
>
> Does anyone know how to make this work?
>
> Also: I would very much like to be able to read and update cache values
> in a class library. I have added the reference System.Web.Caching
> however this doesn't work - is there a way to do this?
>
> Thanks very much!
>
> Fred
>

Hi Sloan:

Thank you very much for the post - I have it working now!

Fred


sloan wrote:

>
> when you pull items from the cache, they are "object"'s ... you may have to
> cast it to the appropriate type.
>
> object o = null;
> if (null!=Cache["key"])
> {
> o = Cache["key"];
> }
> DataSet ds = o as DataSet;
>
> if(null!=ds)
> {
> Console.Writeline(ds.GetXml());
> }
>
> That of course .. is if you put a dataset into the cache.
>
> There is a "smarter" way to do this:
>
>
> see
> http://spaces.msn.com/sholliday/ 10/24/2005 entry
>
> it would be trivial to change this from a Session to an Application holder.
>
>
>
>
>
> "Fred Nelson" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > Hi:
> >
> > This is probably a newby question however I can't figure it out!
> >
> > I'm trying to use application data caching in a web application. I have
> > read an article on 4 guys from rolla that shows the following syntax:
> >
> > Write:
> >
> > Cache["key"] = value;
> >
> > Read:
> >
> > value = Cache["key"] - or - value = Cache.Get["key"]
> >
> > I can save the value (or I think I can) with the "write" statement / I
> > am unable to get the values back with the "read":
> >
> >
> > I receive the compile message:
> >
> > Cannot apply indexing with [] to an expression of type 'method group'
> >
> > Does anyone know how to make this work?
> >
> > Also: I would very much like to be able to read and update cache values
> > in a class library. I have added the reference System.Web.Caching
> > however this doesn't work - is there a way to do this?
> >
> > Thanks very much!
> >
> > Fred
> >
>
>

You should post what you did... so others can learn and know what you
did....
if they google and find this post.


"Fred Nelson" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi Sloan:
>
> Thank you very much for the post - I have it working now!
>
> Fred
>
>
> sloan wrote:
>
> >
> > when you pull items from the cache, they are "object"'s ... you may have
to
> > cast it to the appropriate type.
> >
> > object o = null;
> > if (null!=Cache["key"])
> > {
> > o = Cache["key"];
> > }
> > DataSet ds = o as DataSet;
> >
> > if(null!=ds)
> > {
> > Console.Writeline(ds.GetXml());
> > }
> >
> > That of course .. is if you put a dataset into the cache.
> >
> > There is a "smarter" way to do this:
> >
> >
> > see
> > http://spaces.msn.com/sholliday/ 10/24/2005 entry
> >
> > it would be trivial to change this from a Session to an Application
holder.
> >
> >
> >
> >
> >
> > "Fred Nelson" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > Hi:
> > >
> > > This is probably a newby question however I can't figure it out!
> > >
> > > I'm trying to use application data caching in a web application. I
have
> > > read an article on 4 guys from rolla that shows the following syntax:
> > >
> > > Write:
> > >
> > > Cache["key"] = value;
> > >
> > > Read:
> > >
> > > value = Cache["key"] - or - value = Cache.Get["key"]
> > >
> > > I can save the value (or I think I can) with the "write" statement / I
> > > am unable to get the values back with the "read":
> > >
> > >
> > > I receive the compile message:
> > >
> > > Cannot apply indexing with [] to an expression of type 'method group'
> > >
> > > Does anyone know how to make this work?
> > >
> > > Also: I would very much like to be able to read and update cache
values
> > > in a class library. I have added the reference System.Web.Caching
> > > however this doesn't work - is there a way to do this?
> > >
> > > Thanks very much!
> > >
> > > Fred
> > >
> >
> >
>

Hi Again:

Sloan suggested that I post my code - a good idea - so here it is:

The working code - this handels a string:

Write:

Cache["key1"] = "This is a string saved in application cache";


Read:

object ostring = null;
if (null != Cache["key1"])
{ ostring = Cache["key1"]; };

// if not null (otherwise load blank):

string mystring = ostring as string;


Fred


Fred Nelson wrote:

> Hi Sloan:
>
> Thank you very much for the post - I have it working now!
>
> Fred
>
>
> sloan wrote:
>
> >
> > when you pull items from the cache, they are "object"'s ... you may have to
> > cast it to the appropriate type.
> >
> > object o = null;
> > if (null!=Cache["key"])
> > {
> > o = Cache["key"];
> > }
> > DataSet ds = o as DataSet;
> >
> > if(null!=ds)
> > {
> > Console.Writeline(ds.GetXml());
> > }
> >
> > That of course .. is if you put a dataset into the cache.
> >
> > There is a "smarter" way to do this:
> >
> >
> > see
> > http://spaces.msn.com/sholliday/ 10/24/2005 entry
> >
> > it would be trivial to change this from a Session to an Application holder.
> >
> >
> >
> >
> >
> > "Fred Nelson" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > Hi:
> > >
> > > This is probably a newby question however I can't figure it out!
> > >
> > > I'm trying to use application data caching in a web application. I have
> > > read an article on 4 guys from rolla that shows the following syntax:
> > >
> > > Write:
> > >
> > > Cache["key"] = value;
> > >
> > > Read:
> > >
> > > value = Cache["key"] - or - value = Cache.Get["key"]
> > >
> > > I can save the value (or I think I can) with the "write" statement / I
> > > am unable to get the values back with the "read":
> > >
> > >
> > > I receive the compile message:
> > >
> > > Cannot apply indexing with [] to an expression of type 'method group'
> > >
> > > Does anyone know how to make this work?
> > >
> > > Also: I would very much like to be able to read and update cache values
> > > in a class library. I have added the reference System.Web.Caching
> > > however this doesn't work - is there a way to do this?
> > >
> > > Thanks very much!
> > >
> > > Fred
> > >
> >
> >
>