C# Discussion Boards - CodeProject

26-Jul-02 8:59

i have a static arraylist Commands, and a struct SvrCmd

i have used the following code to create a static member of type SvrCmd, and also add that static member, to the Commands array list

public static SvrCmd Abor = new SvrCmd();			
Abor.Cmd = "ABOR";
Abor.Description = "Abort Transfer";
Commands.Add(ServerCommand.Abor);

and i get a whole load of errors.

oh yer, the SvrCmd struct has public string members Cmd and Description

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"All programmers are playwrights and all computers are lousy actors."

leppie26-Jul-02 9:02

26-Jul-02 9:02

We need a whole lot more info Smile | :)

What errors are you getting?

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Nnamdi Onyeyiri26-Jul-02 9:06

26-Jul-02 9:06

invalid token '=' at the bit

Abor.Cmd = "ABOR";
Abor.Description = "Abort Transfer";

and invalid token '(' and ')' at the bit

Commands.Add(ServerCommand.Abor);

as i said in a post below, i found a little hack by using a contructor, but i dont think thats good enough Hmmm | :|

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"All programmers are playwrights and all computers are lousy actors."

leppie26-Jul-02 9:15

26-Jul-02 9:15

Nnamdi Onyeyiri wrote:
Commands.Add(ServerCommand.Abor);

What is ServerCommand? You say you have a SvrCmd type. Suspicious | :suss:

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Nnamdi Onyeyiri26-Jul-02 9:15

26-Jul-02 9:15

lol

ServerCommand is the class that the code is in.

SrvCmd is just a struct, wiv two variables string Cmd and string Description

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

leppie26-Jul-02 9:36

26-Jul-02 9:36

Hi again,

It must be late or I'm just plain thick, but what is the purpose for the members to be static? Confused | :confused:

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Nnamdi Onyeyiri26-Jul-02 9:39

26-Jul-02 9:39

its holding information. i just didnt want to have to create instances, fore what i had in min,d i didnt see the point.

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

leppie26-Jul-02 9:49

26-Jul-02 9:49

but why declare Abor static, if you are creating an instance anyway? Smile | :)

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Nnamdi Onyeyiri26-Jul-02 9:49

26-Jul-02 9:49

im not - thats why its static.

Abor is in a class called ServerCommand

SrvCmd is a struct, which ive used to make the Abor object.

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

leppie26-Jul-02 10:09

26-Jul-02 10:09

Nnamdi Onyeyiri wrote:
im not - thats why its static.

You are!!!

public static SvrCmd Abor = new SvrCmd();

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Nnamdi Onyeyiri26-Jul-02 10:12

26-Jul-02 10:12

im iticating a static member of type svrcmd in another class, because i want each of the static variables to hold two pieces of information.

anywayx, no need to get ur knickers in a twist, rama solved it for me, i had to put the code where i assigned a value to Abor in a constructos.

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

Nnamdi Onyeyiri26-Jul-02 9:04

Taking the system tray a step further

26-Jul-02 9:04

ive found a hack for stoping a problem with the Abor.Cmd Abor.Description bit, i gave the SvrCmd() struct a contructor, and set the values in that. Big Grin | :-D

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

sasdav26-Jul-02 7:15

sasdav

26-Jul-02 7:15

Thanks to help from several people I can now get my NotifyIcon to display text instead of an image, and it can change at run time. Very cool. The next logical step, of course, is to display text instead of an icon.
Basically, I'd like to replace the System Tray clock with my own clock so I can setup different formats, etc.
So, my question is, how can I draw TEXT in the system tray instead of an icon?

thanks

DataGridColumnStyle Class

stephen woolhead26-Jul-02 6:37

stephen woolhead

26-Jul-02 6:37

I have this class that I have derived from DataGridColumnStyle and all is working well apart from one issue.

In my test program I have created a DataSet at runtime and created a table with 3 columns, the table is set to the datasource for the grid. One of the columns is set to readonly.

Now my problem is that I can't seem to find anyway to detect this from within my derived DataGridColumnStyle class. The DataGridTextBoxColumn class seems to manage this feat somehow. For me I just get an exception thrown from DataGrid.CommitEdit() telling me that an object reference is not set to an object when I try to commit the change.

Anyone got any ideas on how I could dected the the DataSet.DataTable.DataColumn is read only?

Thanks

Stephen.

math and statistical functions

troz26-Jul-02 4:51

26-Jul-02 4:51

hello
I'm looking for a nice class containing high level math or statistical functions. Indeed I only know System.Math that isn't enough.
Notably, I've to use the normsdist function (an excel statistical function)
Does anybody know if such a class exist in .net or on the web, or how to create this function

Excel Help :

Returns the normal distribution for the specified mean and standard deviation. This function has a very wide range of applications in statistics, including hypothesis testing.

Syntax

Returns the standard normal cumulative distribution function. The distribution has a mean of 0 (zero) and a standard deviation of one. Use this function in place of a table of standard normal curve areas.

Syntax

NORMSDIST(z)

Z is the value for which you want the distribution.

Thanks a lot

Richard Deeming26-Jul-02 5:32

Richard Deeming

26-Jul-02 5:32

Look at: http://ce597n.www.ecn.purdue.edu/CE597N/1997F/students/michael.a.kropinski.1/project/tutorial[^]

public class Stats {
    static readonly double root2Pi = Math.Sqrt(2.0 * Math.PI);

    public static double normDist(double y) {
        return Math.Exp(-(y*y)/2.0) / root2Pi;
    }
    public static double normDist(double y, double mean, double stdDev) {
        double yStd = y - mean;
        return Math.Exp(-(yStd*yStd)/(2.0 * stdDev * stdDev)) / (stdDev * root2Pi);
    }
}

troz28-Jul-02 20:46

28-Jul-02 20:46

thx Richard
but what I need isn't the density function, that is calculable from the Math class, but the integral of this density.
But with the other post, I will surely find what I need
thx for your help
troz

troz28-Jul-02 22:08

28-Jul-02 22:08

there is the cumulative fonction in addition of your first formula
caution : this is an approximation, found on http://www.pitt.edu/~wpilib/gaussfaq.html
this is only available for y>=0, the precision is 5 digits
and it's only for mean =0 and stdDev = 1

public class Stats
{
static readonly double root2Pi = Math.Sqrt(2.0 * Math.PI);
public static double normDist(double y)
{
return Math.Exp(-(y*y)/2.0) / root2Pi;
}
public static double normDist(double y, double mean, double stdDev)
{
double yStd = y - mean;
return Math.Exp(-(yStd*yStd)/(2.0 * stdDev * stdDev)) / (stdDev * root2Pi);
}
//Attention : CumulnormDist est une approximation (à 10^-5 pres)
//De plus, elle n'est correcte que pour x>=0
//et pour m=0 et sigma = 1 !
public static double CumulnormDist(double y)
{
double t = 1/(1 + 0.33267 * y);
double norm = Stats.normDist(y);
double p = 1 - norm * (0.4361836*t - 0.1201676 *t*t + 0.9372980 * t*t*t);
return(p);
}
}

leppie26-Jul-02 9:05

26-Jul-02 9:05

http://www.cdrnet.net/projects/nmath/

This mite help Smile | :)

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troz28-Jul-02 20:47

Setting/changing attributes at runtime

28-Jul-02 20:47

thx a lot, it seems nice

troz

leppie25-Jul-02 23:52

Re: Setting/changing attributes at runtime

25-Jul-02 23:52

Hi all,

Is there a way of changing (or setting ) attributes (specifically ReadOnly) at runtime? I have looked at the CustomAttributeBuilder class but it seems to be difficult to understand and apply Frown | :(

. I could be wrong.

Anyone?

Thanx all Smile | :)

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James T. Johnson26-Jul-02 1:21

James T. Johnson

26-Jul-02 1:21

Nope, at least none that I know of.

Attributes are part of a types meta-data which is created at compile time so they aren't things that can be added and removed at runtime.

I think that CustomAttributeBuilder is used to create new Attributes for use in your Reflection.Emit generated code.

James
"Java is free - and worth every penny." - Christian Graus

Re: Setting/changing attributes at runtime

leppie26-Jul-02 2:05