LINQ and XML for compact framework

[luowan]

Hi

I am currently building an application on .NetCF 3.5 in C#. The
application needs to process xml files. I am thinking about using LINQ
to process XML. I wrote a piece of code to modify the specified
element's value.
XmlReaderSettin gs settings = new
XmlReaderSettin gs();
settings.Confor manceLevel =
ConformanceLeve l.Fragment;
settings.Ignore Whitespace = true;
settings.Ignore Comments = true;
XmlReader reader = XmlReader.Creat e(inboxPath,
settings);

XElement root = XElement.Load(r eader);
IEnumerable<XEl ementmsgs = from el in
root.Descendant s("Message")
where el.Element("Mes sageID").Value ==
MsgID
select el;

foreach (XElement el in msgs)
{

el.Element("Mes sageStaus").Set Value(newStatus .ToString());
}
root.Save(inbox Path);

Here is the error message that I received :

msgs.System.Col lections.Generi c.IEnumerator<T Source>.Current 'System.Collect ions.Generic.IE numerable<Syste m.Xml.Linq.XEle ment>'
does not contain a definition for 'System' and no extension method
'System' accepting a first argument of type
'System.Collect ions.Generic.IE numerable<Syste m.Xml.Linq.XEle ment>'
could be found (are you missing a using directive or an assembly
reference?)

Could someone please explain to me why I get such error message? By
the way I have refference all the necessary dlls. (System.linq;
System.xml.linq )

Is it because I am using compact framework? I've tested this code on
a normal framework. It is working fine.

[Jon Skeet [C# MVP]]

<lu****@gmail.c omwrote:

<snip>

Is it because I am using compact framework? I've tested this code on
a normal framework. It is working fine.

That's very strange indeed - what line does the error message point at?

Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <sk***@pobox.co m>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon.skeet
C# in Depth: http://csharpindepth.com

[Wan]

On Apr 30, 7:52*pm, Jon Skeet [C# MVP] <[e-mail] mwrote:

*<luo...@gmail. comwrote:

<snip>

Is it because I am using compact framework? *I've tested this code on
a normal framework. *It is working fine.

That's very strange indeed - what line does the error message point at?

Could you post a short but complete program which demonstrates the
problem?

Seehttp://www.pobox.com/~skeet/csharp/complete.htmlfo r details of
what I mean by that.

--
Jon Skeet - <[e-mail] m>
Web site:http://www.pobox.com/~skeet*
Blog:http://www.msmvps.com/jon.skeet
C# in Depth:http://csharpindepth.com

Actually it is not error, my program is still running. However, if I
place a break point at
IEnumerable<XEl ementmsgs = from el in
root.Descendant s("Message")
where el.Element("Mes sageID").Value ==
MsgID
select el;

After the statement is excuted, if I look up 'msgs' 's value, I will
get such error message.

[Jon Skeet [C# MVP]]

Wan <lu****@gmail.c omwrote:

Actually it is not error, my program is still running. However, if I
place a break point at
IEnumerable<XEl ementmsgs = from el in
root.Descendant s("Message")
where el.Element("Mes sageID").Value ==
MsgID
select el;
After the statement is excuted, if I look up 'msgs' 's value, I will
get such error message.

In that case it sounds like a debugger problem rather than anything
else.

--
Jon Skeet - <sk***@pobox.co m>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon.skeet
C# in Depth: http://csharpindepth.com

[Wan]

On Apr 30, 9:46*pm, Jon Skeet [C# MVP] <[e-mail] mwrote:

Wan <luo...@gmail.c omwrote:

Actually it is not error, my program is still running. *However, if I
place a break point at
IEnumerable<XEl ementmsgs = from el in
root.Descendant s("Message")
* * * * * * * * * * * * * * * *where el.Element("Mes sageID").Value ==
MsgID
* * * * * * * * * * * * * * * *select el;

After the statement is excuted, if I look up 'msgs' 's value, I will
get such error message.

In that case it sounds like a debugger problem rather than anything
else.

--
Jon Skeet - <[e-mail] m>
Web site:http://www.pobox.com/~skeet*
Blog:http://www.msmvps.com/jon.skeet
C# in Depth:http://csharpindepth.com

I've tested on two PCs, both the same.
Can some one post a tested working code of query the XML by using LINQ
with compact framework?

[Jon Skeet [C# MVP]]

Wan <lu****@gmail.c omwrote:

I've tested on two PCs, both the same.
Can some one post a tested working code of query the XML by using LINQ
with compact framework?

Well hang on - you've posted an error which you look in the debugger.
You've said the program is still running. What's it doing that you
don't expect it to?

Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <sk***@pobox.co m>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon.skeet
C# in Depth: http://csharpindepth.com

[Jon Skeet [C# MVP]]

On May 1, 10:56 am, Wan <luo...@gmail.c omwrote:

Here is the full sample code. with the XML sample.

Well, it's not exactly a full sample - it doesn't contain a Main
method, for instance. It's not even a complete class - where's the
implementation of InitializeCompo nent?
Hint: console apps are generally a lot shorter.

See http://pobox.com/~skeet/csharp/incomplete.html

When I said the program was running, I mean the code was compiled.
However, the code does not do the job. The project I created was
based on Windows Mobile 6 SDK and Compact Framework 3.5.

When you say "the code does not do the job" what exactly do you mean?
What does it do, and what do you want it to do?

Jon

[Wan]

On May 1, 11:44*am, "Jon Skeet [C# MVP]" <[e-mail] mwrote:

On May 1, 10:56 am, Wan <luo...@gmail.c omwrote:

Here is the full sample code. with the XML sample.

Well, it's not exactly a full sample - it doesn't contain a Main
method, for instance. It's not even a complete class - where's the
implementation of InitializeCompo nent?
Hint: console apps are generally a lot shorter.

Seehttp://pobox.com/~skeet/csharp/incomplete.html

When I said the program was running, I mean the code was compiled.
However, the code does not do the job. *The project I created was
based on Windows Mobile 6 SDK and Compact Framework 3.5.

When you say "the code does not do the job" what exactly do you mean?
What does it do, and what do you want it to do?

Jon

Hi Jon

I think it is complete, Please create a windows application project
with smart device. Put the code under Form.cs. I don't think you
need to implement a 'Main'.

Regards,
Wan

[Wan]

On May 1, 11:44*am, "Jon Skeet [C# MVP]" <[e-mail] mwrote:

On May 1, 10:56 am, Wan <luo...@gmail.c omwrote:

Here is the full sample code. with the XML sample.

Well, it's not exactly a full sample - it doesn't contain a Main
method, for instance. It's not even a complete class - where's the
implementation of InitializeCompo nent?
Hint: console apps are generally a lot shorter.

Seehttp://pobox.com/~skeet/csharp/incomplete.html

When I said the program was running, I mean the code was compiled.
However, the code does not do the job. *The project I created was
based on Windows Mobile 6 SDK and Compact Framework 3.5.

When you say "the code does not do the job" what exactly do you mean?
What does it do, and what do you want it to do?

Jon

'InitializeComp onent' method is generated when the project is
created. Since VS 2005, it is seperated from the form class.

Regards,
Wan

[Jon Skeet [C# MVP]]

On May 1, 12:43 pm, Wan <luo...@gmail.c omwrote:

I think it is complete,

No, it's definitely not.

Please create a windows application project
with smart device. Put the code under Form.cs. I don't think you
need to implement a 'Main'.

Only because Visual Studio creates another file for you that *does*
contain Main. Likewise the Form1.Designer. cs file contains
InitializeCompo nent. Without that, it's not complete.

In short, I can't cut and paste the code into a text editor *on its
own* and compile from the command line, which is what I tend to do
with newsgroup posts. Again, please read
http://pobox.com/~skeet/csharp/incomplete.html

You also *still* haven't said how it behaves differently to how you
expect it to.

Jon