C# Discussion Boards - CodeProject

Urs Enzler26-Jul-07 20:54

Urs Enzler

26-Jul-07 20:54

string[] mlines = new string[3];  // 3 is its size

mlines[0] = "xyz";

-^-^-^-^-^-
no risk no funk

Christian Graus26-Jul-07 20:59

26-Jul-07 20:59

I suggest you read a basic C# text, you cannot create any reference type without the 'new' keyword.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Martin#26-Jul-07 21:00

26-Jul-07 21:00

Hello,

The StringCollection would be the dynamic way!

System.Collections.Specialized.StringCollection yourStringCollection = new System.Collections.Specialized.StringCollection();
yourStringCollection.Add("addedText");

All the best,

Martin

T.EDY26-Jul-07 21:27

T.EDY

26-Jul-07 21:27

xmen_xwk wrote:
string[] mlines;

where is the "new" keyword?

try :

string [] mlines = new string [3];

Regards,

Tomi

Xmen Real 26-Jul-07 23:04

26-Jul-07 23:04

thanks
but i dont know how much size of array will be there
for intance
if i wanna write

string [] mlines = new string [3];
mlines = string2.split('.')

it might be possible that splitted part more than 4,
then what i should write instead of 3

Becoming Programmer...

Martin#26-Jul-07 23:17

26-Jul-07 23:17

Hello,

In this case you don't have to instanciate the array, because the Split method returns an new instance of string[].
This will work:

string[] mlines;
mlines = string2.split('.');

All the best,

Martin

Xmen Real 27-Jul-07 2:22

27-Jul-07 2:22

but that defining array in GD giving error as i said above

Becoming Programmer...

Martin#27-Jul-07 3:25

27-Jul-07 3:25

Hello,

It would help if youpost the error message.

But this works:

string test = "abc.def.ghi";
string[] testarray = test.Split('.');

All the best,

Martin

Xmen Real 27-Jul-07 4:48

27-Jul-07 4:48

for error read my first post
and you are doing same as i said above

Becoming Programmer...

Martin#27-Jul-07 9:28

27-Jul-07 9:28

Hello,

xmen_xwk wrote:
for error read my first post
and you are doing same as i said above

Sorry, but I'm loosing a little bit of patience write now, as your post seems a little rude to me!
Have you even tried what all the others and I suggested?

You where mixung up two different possibilities of how to use the string[].
1)creating an modifying a string array

string[] testarray = new string[3];
testarray[0] = "firststring";
testarray[1] = "secondstring";
testarray[2] = "thirdstring";

2)Getting a stringarray from the string.Split method.
my answere 10h ago[^]

So if you tried and still have problems, you should post all the involved code + errormessage.
We are trying to help you in our free time, so please respect that, and at least try to help us to help you!

All the best,

Martin

Xmen Real 27-Jul-07 18:07

27-Jul-07 18:07

Martin# wrote:
as your post seems a little rude to me!

sorry buddy but i wasnt in rude manner, you misundertood me or i wrote wrong sentences, and i never be rude for who are helping me and others...

i said "for error read my first post" because i thought that you forgot error or werent read that, anyway if you felt hurt then sorry

and about my problem :

string[] mlines;
mlines = string2.split('.');

this code works if i define

string[] mlines;

in any event(click, load, etc) but its giving error if i define it in General declaration

the error is
"Object reference not set to an instance of an object."

Becoming Programmer...

Martin#29-Jul-07 8:59

How to increment the value of "Current Queue Length" counter for .NET CLR LocksandThreads

29-Jul-07 8:59

Hello,

xmen_xwk wrote:
sorry buddy but i wasnt in rude manner, you misundertood me or i wrote wrong sentences, and i never be rude for who are helping me and others...

My impression was, that you were not trying out what have been suggested.
But anyway, I have a wild guess write now.

I don't think that your problem is the string[] mlines, I think it's "string2" which is null.
Because you have not assigned a text at this time.

try:

if(string2!=null)
    mlines = string2.split('.');

Hope it helps!

All the best,

Martin

Vikas Pai26-Jul-07 20:35

Vikas Pai

26-Jul-07 20:35

Hello,
I am stuck up with one problem from last 4 days please help.

Problem: I have to write a code to simulate DEADLOCK among threads and the formula that is documented for detecting the deadlock is:
Formula: “Current Queue Length” = “Threads Count” AND “Process/% Processor Time” < 1

The Definition of “Current Queue Length” counter is
: This displays the total number of threads that are currently waiting to acquire a managed lock in the application.Iit displays the last observed value. This helps you identify inefficient synchronization mechanisms.
The count keeps on rising steadily.

But this Counter(Current Queue Length) always shows 0 value when I look at it's value through Perfmon utility

The code which I have written is as follows:

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace Threads
{
class Tester

{
static void Main( )
{
// make an instance of this class
Threads.ThreadingExamples.CPUSpinWithDeadlock p = new Threads.ThreadingExamples.CPUSpinWithDeadlock();

// run outside static Main
p.DoTest();
break;
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.IO;

namespace Threads.ThreadingExamples
{
class CPUSpinWithDeadlock
{
public bool locked = true;
public static Thread[] ThreadsArray = new Thread[10];

//Creating a var "Count" which should be in Critical Section to avoid concurrent access to it.
public static string Count = "You r in ";

public void DoTest()
{
Console.WriteLine("Press any key to continue");
Console.Read();
//Main Thread ------- Starts.

//Lock the var Count to avoid concurrent access by threads.

for (int counter = 0; counter < 10; counter++)
{
if (counter == 0)
{
ThreadsArray[counter] = new Thread(
new ThreadStart(ILoop));
}
else
{
ThreadsArray[counter] = new Thread(
new ThreadStart(Loop));
}
ThreadsArray[counter].Start();
}
}

public void ILoop()
{
Console.Write("First Thread ");

Lock(CPUSpinWithDeadlock.Count)
{
Count = "Main Thread";
while (true)
{
Console.WriteLine("Hello");

//Thread Sleep to reduce the CPU Utilization by current thread.
Thread.Sleep(1000);
}
}
}

public void Loop()
{
Console.Write("Calling lock ");

// To make remaining 9 threads wait for thread no 1 to release the lock acquired by it
//so that the remaining threads would be queued and the the counter value of "Current Queue Length"
// would go up.

CPUSpinWithDeadlock.ThreadsArray[0].Join();

Lock(CPUSpinWithDeadlock.Count)
{
CPUSpinWithDeadlock.Count = "Child Thread";
Monitor.Exit(CPUSpinWithDeadlock.Count);
}

}
}
}

Thanks & Regards,
Vikas M Pai
Software Engineer

Default Parameters

M. J. Jaya Chitra26-Jul-07 20:17

M. J. Jaya Chitra

26-Jul-07 20:17

Hai Everybody,
Have a nice day!

Can we use default parameters in C# if yes please tell me how or else give me an alternate way to achieve default parameter concept

Best Regards,
M. J. Jaya Chitra

Re: Default Parameters

Christian Graus26-Jul-07 20:22

26-Jul-07 20:22

No, you have to do this

void MyMethod(string s, bool b)
{
}

void MyMethod(string s)
{
MyMethod(s, true); // makes true the default
}

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Default Parameters

M. J. Jaya Chitra26-Jul-07 21:03

M. J. Jaya Chitra

26-Jul-07 21:03

So we have to overload the methods in order to have default parameters is it right

Best Regards,
M. J. Jaya Chitra

Re: Default Parameters

Michael Sync26-Jul-07 21:29

Michael Sync

26-Jul-07 21:29

M. J. Jaya Chitra wrote:
So we have to overload the methods in order to have default parameters is it right

Yeah.

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

MarshallByreference

prabhu dot net26-Jul-07 19:55

prabhu dot net

26-Jul-07 19:55

Hai guys, actually MarchallByReference is used to give permission to the remote application to access the particular class, but for what purpose the "UnMarshall" is used for?
Roll eyes | :rolleyes:

Crystal report Problem

help as an alias26-Jul-07 19:46

help as an alias

26-Jul-07 19:46

Hi All,
I want to connect a crystal Report dynamically with database which changes accordingly but the table is same in all the database table name = “Stock “ Also I want to add condition
“SELECT * FROM Stock Where Date BETWEEN ‘xyz’ AND ‘abc’” Database used by me is ACCESS.

Any one help me. Thanks in advance. Smile | :)

Nikesh Kr. Yadav

CSS Infotech
Sec- 31
Gurgaon,
Haryana(India)

STOP !!!

Christian Graus26-Jul-07 20:21

Re: Crystal report Problem

26-Jul-07 20:21

Looking at your message history, you post every question you have to at least three forums. Please don't do that, it's rude and annoying. Pick the right forum and ask there.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

T.EDY26-Jul-07 20:48

T.EDY

26-Jul-07 20:48

try to search for an article in Code project..there shold be able to answer your question,because u need an example to do that. Smile | :)

Regards,

Tomi

load file names

amilapradeep26-Jul-07 18:43

amilapradeep

26-Jul-07 18:43

i want to populate combo by file names which contain on specified folder on form load.still i couldn't find a way. can anyone help me to solve this.

Re: load file names

Christian Graus26-Jul-07 18:47