Re: c# - Cinema system - Noob need help - 2d arrray - - C# Discussion Boards

Member 1037988611-Nov-13 10:27

11-Nov-13 10:27

Hi I am doing an exercise to change the content of a button 9windows app 7.1 VS2012)

I create the project and then its says

SQL

Drag a Button on to the Designer.  See how it updates the Xaml with the Button tag.  Selecting items in the Document Outline Window allows you to navigate the Xaml tree and it selects the item visually as well as in the Xaml.  It is a handy way to navigate complex Xaml if not all of the Xaml is visable.
 Select the Button go to the properties Window - this also creates events.
You can edit the control in the Properties Window or hand-edit the Xaml. To create an event you can either use the properties window or edit the Xaml.
To do this go to the Xaml for MainPage.xaml and find the Button that was added.  Type Click= and then tab to create the event handler.  This has been added in the code-behind .cs file.  Type Button1.Content = "Hello World!"

I have done what it has say and my MainPage.xaml.cs looks like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;

namespace Hello_World
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            Button.Content = "Hello World";
        }
    }
}


the 'Button.Content' produces this error:

Error	1	An object reference is required for the non-static field, method, or property 

My MainPaipe.zaml has the following code in but no errors

<phone:phoneapplicationpage 
="" x:class="Hello_World.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:ignorable="d" d:designwidth="480" d:designheight="768" fontfamily="{StaticResource PhoneFontFamilyNormal}" fontsize="{StaticResource PhoneFontSizeNormal}" foreground="{StaticResource PhoneForegroundBrush}" supportedorientations="Portrait" orientation="Portrait" shell:systemtray.isvisible="True">

    
    <grid x:name="LayoutRoot" background="Transparent">
        <grid.rowdefinitions>
            <rowdefinition height="Auto">
            <rowdefinition height="*">
        

        
        <stackpanel x:name="TitlePanel" grid.row="0" margin="12,17,0,28">
            <textblock x:name="ApplicationTitle" text="MY APPLICATION" style="{StaticResource PhoneTextNormalStyle}">
            <textblock x:name="PageTitle" text="page name" margin="9,-7,0,0" style="{StaticResource PhoneTextTitle1Style}">
        

        
        <grid x:name="ContentPanel" grid.row="1" margin="12,0,12,0">
            <Button Content="Button" HorizontalAlignment="Left" Height="79" Margin="142,53,0,0" VerticalAlignment="Top" Width="171" Click="Button_Click_1"/>
        
    
 


Help Appreiated

Paddy

Re: Change Content of Button

Pete O'Hanlon11-Nov-13 10:32

Pete O'Hanlon

11-Nov-13 10:32

The problem comes because you are trying to use a variable called Button when there is no such variable. Just because you have defined a Button on the main page, it doesn't mean that the code behind knows about it. There are 2 ways to fix this (without going into doing this via MVVM). The first technique for doing this is to name your button in the XAML using

x:Name="MyButton"

(this goes inside your Button declaration) and then use this name in your codebehind. The second way to do this is to take advantage of the fact that the sender argument refers to the control that set it, so you can do

((Button)sender)....

to set the value.

Re: Change Content of Button

Member 1037988611-Nov-13 11:00

Member 10379886

11-Nov-13 11:00

something so simple grrr, works like a treat! many thanks

Re: Change Content of Button

Pete O'Hanlon11-Nov-13 11:18

Pete O'Hanlon

11-Nov-13 11:18

Not a problem. Glad to be able to help.

c# - Cinema system - Noob need help - 2d arrray -

cSharpDonkey11-Nov-13 4:21

cSharpDonkey

11-Nov-13 4:21

Im working on a project for school, im suppose to make a console application which will show a Cinema system with 20 seats on 15 rows. I am very green on c# - so any help, Critism, or general thoughts are much appreciated!

I got a 2d array set up now, functionally and with space in between items so its not a mess to look at..
Im trying to take the program to the next level now, my program must show which seats are available, and which are taken,
and the program must let you book certain seats, and random seats.
I was thinking to make all the available seats green, and once you booked your seats they should go red -

How can i start doing this proberly?
I think im looking for background Color, and maybe If / else statements?

Here is how my program looks so far:

Console.WriteLine("|--------------------------CINEMA--------------------------|\n");
            int[,] pladser = new int[,]
                {
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
              {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20},
           };

                for (int x = 0; x < pladser.GetLength(0); x++)
                {
                    for (int y = 0; y < pladser.GetLength(1); y++)
                    {
                        Console.Write("{0,3}",pladser[x, y]);

                    }
                    Console.WriteLine();

Re: c# - Cinema system - Noob need help - 2d arrray -

GuyThiebaut11-Nov-13 4:42

GuyThiebaut

11-Nov-13 4:42

Here's a thought - instead of using an array, how about having each seat represented by a class and a list that holds the seats

List<Seat> Seats = new List<Seat>();

private class Seat
{

    public string Row;
    public int SeatNo;
    public bool Reserved;

}

“That which can be asserted without evidence, can be dismissed without evidence.”

― Christopher Hitchens

Re: c# - Cinema system - Noob need help - 2d arrray -

Pete O'Hanlon11-Nov-13 4:43

Pete O'Hanlon

11-Nov-13 4:43

Without really sitting down and designing this fully, I would probably start off by creating a structure that represented a seat (possibly it would look something like this).

public struct Seat
{
  public int Row { get; set; }
  public int Column { get; set; }
  // Some information to link to the person who booked the seat...
}

With this simple structure, I can now quickly add in a booking looking something like this:

public class SeatManager
{
  private List<Seat> _bookedSeats = new List<Seat>();
  public void Add(int row, int column, /* other booking attributes go here */)
  {
    bool booked = _bookedSeats.Where(seat => seat.Row == row && seat.Column = column).Any();
    if (!booked)
    {
      // Add your booking here....
    }
  }
}

From here, you can add any other features that you need.

Re: c# - Cinema system - Noob need help - 2d arrray -

OriginalGriff11-Nov-13 5:18

OriginalGriff

11-Nov-13 5:18

Printing in colour isn't difficult in a Console app - it's just a bit of a nuisance really.
To print a reserved seat in red:

Console.ForegroundColor = ConsoleColor.Red;
Console.Write("{0,3}",pladser[x, y]);
Console.ResetColor();

Or perhaps:

Console.BackgroundColor = ConsoleColor.Red;
Console.Write("{0,3}",pladser[x, y]);
Console.ResetColor();

The ResetColor call is to prevent everything else you write beign in red...

The only instant messaging I do involves my middle finger.

English doesn't borrow from other languages.
English follows other languages down dark alleys, knocks them over and goes through their pockets for loose grammar.

Re: c# - Cinema system - Noob need help - 2d arrray -

V.11-Nov-13 20:18

11-Nov-13 20:18

There must be a hundred ways in doing this. Just to give you an alternative of what you're doing.

The indexes of the array are already the row/seat number so there is no use in putting in a number in the array indicating this. Instead use a boolean. (true = taken, false = free)

Booking certain seats is then just like:

pladser[10, 12] = true;  //booked row 11 seat 13.

For random assignment use the Random class with minimum = 0 and maximum the number of rows (or seats)

Some things to watch out for:
1. if a seat is taken you can't take it again. So take appropriate action.
2. Few people go alone to the movies and they want to sit next to one another if possible so in that case you end up checking multiple seats before assigning.

If you're working with a console application leave out the colors. You could use 'x' and 'o' for example.
Make sure in the output that it is clear to the user wat x, o or green/red mean.

Hope this helps.

V.

(MQOTD Rules and previous Solutions )

subtract list first element with second one,third with secon one an so on

Member 1038120910-Nov-13 22:57

Member 10381209

10-Nov-13 22:57

for (Int32 index = 1; index < dtArray1.Count;index++)
{
    if (dtArray1[index] >= dtArray1[index - 1])
    {
        dtArray1[index].Subtract(dtArray1[index - 1]);
        Console.WriteLine(dtArray1[index]);
        Console.ReadLine();
     }
}

/*Consider that i have list dtArray1 that consist of DateTime items I mean 10.10.2010, 10.10.2015 and so on.  Could u say me how find subract of this element ? How i can get diffeerence between 2 years?

Re: subtract list first element with second one,third with secon one an so on

OriginalGriff10-Nov-13 23:05

OriginalGriff

10-Nov-13 23:05

Well, you could start by assigning the result of the subtraction to a variable, rather than just throwing it away:

TimeSpan diff = dtArray1[index].Subtract(dtArray1[index - 1]);

And then you could use the value it generated...

Re: subtract list first element with second one,third with secon one an so on

Member 1038120910-Nov-13 23:14

Member 10381209

10-Nov-13 23:14

i did it this way but my result is again 10.10.2015 instead of being 5 years

Re: subtract list first element with second one,third with secon one an so on

Pete O'Hanlon10-Nov-13 23:26

Pete O'Hanlon

10-Nov-13 23:26

I seriously doubt you did exactly what Griff said. Your datatype is a DateTime (that's what 10.10.2015 represents) - this is completely different to a TimeSpan.

Re: subtract list first element with second one,third with secon one an so on

Member 1038120910-Nov-13 23:32

Member 10381209

10-Nov-13 23:32

hmmm what u suggest me to do?really i dont know how to solve this problem

Re: subtract list first element with second one,third with secon one an so on

Pete O'Hanlon10-Nov-13 23:47

Pete O'Hanlon

10-Nov-13 23:47

I think the problem is that you can't really explain the problem. If you can't explain the problem, this means you don't fully understand it. If I have a problem like this, I generally start off by breaking the problem down into things I know, and things I'm making as assumptions. By separating this list out, I tend to find I get a better understanding of what's actually being asked.

You keep showing code snippets with vague attempts at solutions, but this is leading us to make assumptions about what you are asking. You need to stop and present the real problem first - then, once you have worked this out, you would break it down further and start looking at code. For instance, you keep talking about years without intersection - but the examples you show effectively just look to work out the difference between the oldest and newest dates. The two things are not the same. Consider this example:

Start   End
1995    2005
2000    2003
1998    2004

The dates that don't overlap are from 1995 to 1998 and 2004 to 2005. So, the total none overlapping years is actually 4 years. As you can see - your use of the term "years without intersection" adds confusion to the situation, so you really need to clarify this before we can continue.

Re: subtract list first element with second one,third with secon one an so on

Member 1038120911-Nov-13 0:16

Member 10381209

11-Nov-13 0:16

no i understand my question but my problem is that i cant explain it ti your ,i want i find lenght of years
if there is overlap years i should delete one of them such as here

Start End
1995 2005
2000 2003
1998 2004 so for my question 2000 subtract 1995 and 2000-2003 is inside 1995-2005 so dont select it and also 1998-2004 inside in 1995-2005 i dont choose this years also so my totals years should be 2005-1995=10 my real question is that but how to do it i dont know

Re: subtract list first element with second one,third with secon one an so on

Pete O'Hanlon11-Nov-13 0:21

Pete O'Hanlon

11-Nov-13 0:21

Don't start off by trying to think in code. Break the problem down using pen and paper. As a hint, you need to extract out the minimum start date and the maximum end date as a first step - only then can you start to remove the overlapping periods.

Re: subtract list first element with second one,third with secon one an so on

Richard MacCutchan11-Nov-13 3:37

Richard MacCutchan

11-Nov-13 3:37

I gave you a suggested answer to this problem last week at http://www.codeproject.com/Messages/4695286/Re-overlap.aspx[^]. Did you ever try it?

Veni, vidi, abiit domum

Re: subtract list first element with second one,third with secon one an so on

OriginalGriff10-Nov-13 23:35

OriginalGriff

10-Nov-13 23:35

look at the value generated by the Subtract: it's not a DateTime, so you aren't using it.
Think about it: what do you get if you subtract one date from another? It can't be a date, because it doesn't have a reference point in time any more. It's a duration, or (in .NET speak) a TimeSpan.

Look at the TimeSpan structure[^], and you should find what you need in it's properties. Unless you want years or months, of course - because those require a reference point as well since they aren't all the same length.
If that's what you need, then try looking at this: Working with Age: it's not the same as a TimeSpan![^]

Import Dll in the Application

Member 913191910-Nov-13 20:23

Member 9131919

10-Nov-13 20:23

hi,

i have a dll and i wanted to copy this dll to application folder and add refrence of DLL. Then

Create Object for the CLass DLL

call the function sendsms with parameter
(username, password, senderid, mobnum, message, smsroute).

I have values for this parameters to pass. How to do that?

Re: Import Dll in the Application

Abhinav S10-Nov-13 20:40

Abhinav S

10-Nov-13 20:40

Depends on whether this is an activex dll or a .Net dll.

If its Activex, you need to import it - Importing and Extending ActiveX Controls in .NET[^].

.Net dll - just add reference, select this dll, instantiate this class and you will have access to public methods.

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

Re: Import Dll in the Application

Alan Balkany14-Nov-13 4:49

Alan Balkany

14-Nov-13 4:49

If the DLL contains a class, you need an extra step to call its member functions: You can create a wrapper class that creates one instance of the DLL's class on initialization, and frees it when done.

Calls to the wrapper-class methods just forward that call to the method of the same name in the single DLL-class instance.

To access the DLL, use (for example) this type of declaration:

[DllImport("ComGUIProxy.dll", EntryPoint = "InitializeContainer")]
public static extern bool InitializeContainer(int hContainer, int TicketID);

And put the DLL in the same folder as your executable.

installer for window form application c# 4.0,2010

Member 1026351910-Nov-13 19:58

Member 10263519

10-Nov-13 19:58

plz help me how to create installer for windows application

Re: installer for window form application c# 4.0,2010

thatraja10-Nov-13 20:07

thatraja

10-Nov-13 20:07

Why didn't you use Google & Codeproject search? Hmmm | :|

dotNetInstaller - Setup Bootstrapper for .NET Application[^]

Codeproject has a section for these kind of things. Codeproject - Development Lifecycle - Installation[^]

thatraja

Please update this article Useful Reference Books, it's urgent for Q/A section

Re: installer for window form application c# 4.0,2010

Abhinav S10-Nov-13 21:12

Abhinav S

10-Nov-13 21:12

MSDN should help you - http://msdn.microsoft.com/en-us/library/k3bb4tfd%28v=vs.100%29.aspx[^].

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

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