LINQ not working

A Repasky

15y2.9kLINQ

My LINQ code is not working. I used this many times before, but in this program it is not working. Here is my code:

static class AutoExtract
{
public static string name = null;
public static string executable = null;
public static string path = null;

public static void Main()
{
try
{
//Get Application Path
path = Output_Files.GetPath();
Console.WriteLine(path);

//Get XML Data
XDocument inputDoc = XDocument.Load(path + @"\AutoExtract.xml");
Console.WriteLine(inputDoc.ToString());

// Query the data
var q = from c in inputDoc.Descendants("AutoExtract")
select new
{
name = (string)c.Attribute("Name"),
executable = (string)c.Attribute("Executable"),
};

foreach (var item in q)
{
name = item.name;
executable = item.executable;
Console.WriteLine("xxx" + item.name + "xxx" + item.executable + "xxx");

//Run process on program
ProcessExtract();
}
Here is my XML file:

Does anyone know why this does not work? And it worked with other programs!

Thanks ahead of time.

arep

11 Replies

Know the answer? Post it — somebody with the same question will find it here.

Ibrahim Rashid15y ago
// Query the data
var q = from c in inputDoc.Descendants("AutoExtract")
select new
{
name = (string)c.Attribute("Name"),
executable = (string)c.Attribute("Executable"),
};

I am not sure, but i have seen a comma(,) after executable = (string)c.Attribute("Executable"), which may be a problem.
Check out.
Vulpes15y ago
If they're all separate processes, running in their own console window, you could redirect the standard output/error for each one to a file.

Program 1 could then read these files in the correct order and print them to its console. It could also delete the files if they're no longer needed.

A Repasky15y ago

That is not the problem. If I run Program A is displays on the console what Extract is running. It is in a loop and when it goes to another extract it display the next Extract that is running. I takes several minutes for each to run, so someone can see where it is in the process of running.

So it will say:

Please wait ... the program for Extract1 is running!
Please wait ... the program for Extract2 is running!






 

Etc.

But since this Program A (and others that do the same console writing) is running under the another Program 1
process that runs Program A, you do not see the console.



 

I am not sure if there is a solution for this.  Technically it would have to be passed up to the process,
Program 1 that is running Program A and then be displayed by the Program 1.




 
I hope this is not confusing.  I tried to explain the best I can.


 
Thanks,
arep

Vulpes15y ago
Try adding these lines after ProcessExtract():

Console.WriteLine("\nPress any key to exit");
Console.ReadKey(true);

This should then prevent the console window closing until you press a key.
A Repasky15y ago
It worked and run the other program fine.

I have another question. When the other program under this run, I write out some console messages. Now since they are running below this program, I do not see them. Is there a way to see them?

Like I said the only thing this program does is run other console programs so that instead of 20 programs running and being scheduled, only this one program is scheduled.

So how do I see the lower console messages? Or do I have to repost this message again with a new topic?

arep
A Repasky15y ago
Vulpes,

You are correct. I was using the wrong Element, which I did not notice. In the other programs I have used the correct Element and in this one I used the wrong one. It seems to be working. This program was written to execute other programs, so that the other programs would not have to me scheduled. They are all batch console programs. Instead of running 20 or so programs and schedule them this program is scheduled and the other programs are run from this. So I still have to see if this is working, but not at least it seems to be executing the LINQ correctly.

So thanks for the help. I am going to leave this open until I see if it does what it is supposed to.

arep
Vulpes15y ago
Sorry, ignore my last post.

Although the documentation doesn't say that it throws an exception if the file can't be found, I've just tried the code and it does in fact do so.

I think the problem actually lies with the query itself which should be:

var q = from c in inputDoc.Descendants("Extract") // not "AutoExtract"
select new
{
name = (string)c.Attribute("Name"),
executable = (string)c.Attribute("Executable"),
};
Vulpes15y ago
My suspicion is that the path from which the XML file is being loaded is no longer valid.

Curiously, XDocument.Load doesn't throw an exception if the file can't be found.

I'd try temporarily hard-coding the path to see if it works then.
A Repasky15y ago
If you want I can upload all the code.

arep
A Repasky15y ago
In the LINQ the 2 variables "name" & "executable" are null. So these 2 lines do not work. Similar code in other programs worked fine. So that is the problem. It looks like the LINQ is not working. It looks like the XML is read in fine, but then the LINQ does not work.

name = (string)c.Attribute("Name"),
executable = (string)c.Attribute("Executable"),

arep
Jaganathan Bantheswaran15y ago
Hi,

What is the error here?

On which particular line you are getting ?