C# Discussion Boards - CodeProject

31-Aug-05 7:23

Please tell me how to implement a method that will look to its own class and return (eg. an array) of all members of this class (its suppose to use reflection, this kind of reflection is called 'self' if I remember good...)

I tried something like that:

<br />
ble b = new ble();<br />
<br />
			Type t;<br />
			FieldInfo[] mi;<br />
			t = typeof(ble);<br />
			mi = t.GetMembers();<br />
<br />
			foreach(MemberInfo mem in mi)<br />
				this.listBox.Items.Add(mem.Name);<br />
<br />

and it wrote some strange stuff... I just want to have all the members of 'ble' class (eg. string s, int i, etc)

Andrew Kirillov31-Aug-05 10:13

Andrew Kirillov

31-Aug-05 10:13

Hello

Suppose we have the next class:

class A
{
	public int memberVariable;
	public void Method1() {}
	public void Method2() {}
}

And the next code somewhere:

Type type = typeof(A);

MemberInfo[] mis = type.GetMembers();

foreach (MemberInfo mi in mis)
{
	System.Diagnostics.Debug.WriteLine(mi.Name);
}

So, we'll get something like this in output window:

memberVariable<br />
GetHashCode<br />
Equals<br />
ToString<br />
Method1<br />
Method2<br />
GetType<br />
.ctor

What is wrong? You have all your own members and inherited members.

Andrew

Yoyosch31-Aug-05 11:46

31-Aug-05 11:46

My variables were private... there is no way ti display them?

Andy Brummer31-Aug-05 11:57

Andy Brummer

31-Aug-05 11:57

try

type.GetMembers(
           BindingFlags.NonPublic|
           BindingFlags.Instance|
           BindingFlags.Static
);

I can imagine the sinking feeling one would have after ordering my book,
only to find a laughably ridiculous theory with demented logic once the book arrives - Mark McCutcheon

Yoyosch31-Aug-05 12:02

31-Aug-05 12:02

thank you very much, this was exactly what I was looking 4

Yoyosch31-Aug-05 12:38

31-Aug-05 12:38

how to retrieve the type of each field? I mean, I would like to know that, for example, 's' is a string

further questions - is it possible to retrieve also information about arguments that funcion takes and the return type?

Werdna31-Aug-05 13:50

Werdna

31-Aug-05 13:50

Type type = typeof(A);<br />
MemberInfo[] mis = type.GetMembers();<br />
foreach (MemberInfo mi in mis)<br />
{	<br />
System.Diagnostics.Debug.WriteLine(mi.Name + ": " + mi.MemberType.ToString());<br />
}

Yoyosch31-Aug-05 14:15

31-Aug-05 14:15

it doesnt work - I tried and MemberType gives exactly the same as MemberType.ToString() - it gives only general info (method, field, etc) and I want detailed information (string, int, char, etc)

Windows Service arguments

Andy Brummer31-Aug-05 18:01

Andy Brummer

31-Aug-05 18:01

You want ReflectedType. All your questions can be answered by MSDN[^] though.

I can imagine the sinking feeling one would have after ordering my book,
only to find a laughably ridiculous theory with demented logic once the book arrives - Mark McCutcheon

vSoares31-Aug-05 7:01

vSoares

31-Aug-05 7:01

Hi all,

I've built a Windows Service wich accepts arguments in the main function so I can execute the exe like <code>MyWindowsServ.exe –install</code>.

I can install the service, I can run it, and everything runs ok.

Now, what I wanted to do was to install the service so when it starts it can take some arguments as well.

If you look at the COM+ Event System service properties (for instance) in your control panel, you can see that the path to executable is something like this <code>C:\WINDOWS\system32\svchost.exe -k netsvcs</code>

Is there a way I can add these arguments to my ProcessInstaller or ServiceInstaller or something like that?

Thanks,

<i>vSoares</i>

Re: Windows Service arguments

Mohamad Al Husseiny31-Aug-05 7:18

Mohamad Al Husseiny

31-Aug-05 7:18

You can pass startup parameter to windows service but however rather than acceptin arguments in Main Method Windows service accept arguments and handle them in OnStart MethodTo setup startup parameter
Open the windows Services MMC snap-in
Select your Service->Properties-->General
You will find Start Parameters you can write your start parameters in it To add this information when you install windows service you have to write start parameters in registry under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
start up parameter stored in ImagePath

There are some articles at codeproject about custom installation of Windows service like
Install Service Using Script[^]
ServiceInstaller Extension That Enables Recovery and Autostart Configuration
[^]
Install a Windows service the way YOU want to[^]
MCAD

-- modified at 14:58 Wednesday 31st August, 2005

Old C New C#

buggity31-Aug-05 5:51

buggity

31-Aug-05 5:51

I would like to be able to use some old ANSI C functions but have access to them using a new GUI built in C#. Basically I'm trying to take a comsole app and make it windows based. Is there anyway to do this? I have tried adding the reference but, even though the code is compiled under .NET, it doesnt seem to like it. ANy suggestions? Or am I SOL?

Thanks in advance
Mark

Re: Old C New C#

Mohamad Al Husseiny31-Aug-05 6:17

Mohamad Al Husseiny

31-Aug-05 6:17

put your c code in dll and use this dll in your c# code
P/Invoke will help you to do this
look at question titled using c++ dll in this forum page
i provide link to P/invoke article

MCAD

method

HFreitas31-Aug-05 5:30

HFreitas

31-Aug-05 5:30

hi all i´m a little new in c# and i am having problem doing some programming

the question is: implement a method that returns an average of set variavel of arguments in integer type
can anyone help

it is quite simple but not for me

Yoyosch31-Aug-05 6:01

31-Aug-05 6:01

1. What do you mean by 'set' of arguments?

2. What kind of average? There is several differend kinds of average value...

Judah Gabriel Himango31-Aug-05 6:23

Judah Gabriel Himango

31-Aug-05 6:23

So, let's say you have a set of an unknown number of arguments

void Test(params int[] arguments)
{
}

You could compute the average by using something like

// first, get the sum of all the numbers
int sum = 0;
foreach(int i in arguments)
{
    sum += i;
}

// then, divide the sum by the number of arguments to return the average
int average = sum / arguments.Length;

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Cops & Robbers
Judah Himango

Mohamad Al Husseiny31-Aug-05 6:26

Mohamad Al Husseiny

31-Aug-05 6:26

To pass Variable Parameters to method use params keyword For example

public int GetAverage (params int[] nums)
{
// put your code here
//you can get the number of parameter passed
//by calling nums.GetLength

}

MCAD

Updating Datagrid Cell Value

Guffa31-Aug-05 7:50

Guffa

31-Aug-05 7:50

That looks very much like a school asignment. Are you trying to trick other people to do your homework?

---
b { font-weight: normal; }

Member 156189431-Aug-05 5:20

Member 1561894

31-Aug-05 5:20

Hi All,

This probably really easy for somebody out there but this problem is doing my head in! What i want to do is update a a single cell in a in a datarow of a datagrid with a value from a textbox so i don't have use a query to repopulate the datagrid after a update query.

What i've tried
Updating the DataTable or DataSet from the datagrid before updating with the following code:
1)mydatatable.Rows[lastUpdatedRecord].ItemArray.SetValue(int.Parse(txtVal.Text),0);
2)ds.Tables[0].Columns[0].Table.Rows[lastUpdatedRecord].ItemArray.SetValue(int.Parse(txtVal.Text),0);

and then rebind it to the datagrid.

My problem is that the "ItemArray.SetValue" method doesn't seem to be updating the value when i check it through the step through debugging.

Please help,
Thanks in advance

confused

Alomgir Miah31-Aug-05 6:58

Alomgir Miah

31-Aug-05 6:58

Dont play with the itemarry. It is handled internally.

mydatatable.Rows[lastUpdatedRecord] = int.Parse(txtVal.Text);

will do the job.

Live Life King Size
Alomgir Miah

wiseylondon31-Aug-05 22:20

wiseylondon

31-Aug-05 22:20

Thank you for your response.

My problem is this:
mydatatable.Rows[lastUpdatedRecord] = "Needs Type DataRow"

DataRow is made up of a array of values, a single value in the array represents a single cell value in the datarow. I just need to update a single cell value in the datarow array.

Is there any other way of updating the datagrid without having to query the database?

Thanks in advance,

mav.northwind31-Aug-05 22:56

mav.northwind

31-Aug-05 22:56

With just one indexer (lastUpdatedRecord) you reference a single row, but when you use 2 indexers, you can access a single cell:
mydatatable.Rows[lastUpdatedRecord][columnNumber] = newValue;

Regards,
mav