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Thanks I'll check into that.
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This is from a tutorial from Home & Learn:
http://www.homeandlearn.co.uk/csharp/csharp_s13p3.html[^]
The problem I am having is with an uninitialized variable but I can't figure out how to do it:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Multiple_Forms
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
Form2 secondForm = new Form2();
public static TextBox tb = new TextBox();
private void btnFormTwo_Click(object sender, EventArgs e)
{
secondForm.ShowDialog();
}
private void Form1_Load(object sender, EventArgs e)
{
tb = txtChangeCase;
}
}
}
The problem is with the last line.
I can see why...just can't figure out what to do to fix it.
Anyone know the answer?
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Why is tb static? What is txtChangeCase? And what is the exception? (I can only think of 1 case where a direct assignment to a field (not through an indexer or anything like that) could throw an exception: when there is an implicit cast that throws an exception (which is rare))
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That tutorial fails on so many levels that I would advice against ever even thinking about it, but I'd like someone else's opinion about that too
I mean come on:
- a static textbox as a way to communicate between forms (please no.)
- creating a new textbox and then almost immediately afterward throwing it away without ever having used it (why?)
- writing ==true (seriously, wtf, you might as well write if((x == true) == true && x != false) just to be very sure that x is indeed true )
- referring to a computer program as "programme". huh? shows lack of knowledge of the jargon IMO, and I already got the impression that the writer of that tutorial is a noob (he also uses CreateGraphics inside the Paint event later on)
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harold aptroot wrote: he also uses CreateGraphics inside the Paint event
he is to be shot on sight!
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. [The QA section does it automatically now, I hope we soon get it on regular forums as well]
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I hadn't seen that site before, judging from that one page it isn't worth a penny, it being inaccurate and confusing.
Buy and study a book, you may learn all you need and more in less than a week. This[^] explains my view on books.
Trying to learn from a free site only gives you what you paid for, i.e. nothing much.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. [The QA section does it automatically now, I hope we soon get it on regular forums as well]
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Luc Pattyn wrote: Trying to learn from a free site only gives you what you paid for, i.e. nothing much.
I don't know, I can think of at least one site that is free and is a pretty good learning resource. It may not compare to a book, but it is a little more than "nothing much".
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that must be an exceptional site then.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. [The QA section does it automatically now, I hope we soon get it on regular forums as well]
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Ditto the comments from the others.
Probably the most correct way to acheive the result that the tutorial was aiming for would be to:
1. Create a Case enum.
2. Have a private field of type Case in the dialog form that is set according to the radio buttons and expose this field in a public read only property.
3. Check the DialogResult of the dialog form in the main form, if OK then read the property before disposing of the form.
4. Use the Case obtained from the property in a switch block and change the TextBox 's Text property accordingly.
What is it you were wanting to learn from that tutorial - changing the case of a string, using a dialog to get a user selection that may be returned to the instanciating form, or general inter-object communication?
Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn) Why are you using VB6? Do you hate yourself? (Christian Graus)
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Thanks Dave. Basically the idea was to introduce using multiforms with the second form used to perform the changes on the first form. As you have all pointed out I am obviously using a poor source of information.
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I'll knock you up a simple demo this weekend and post back here if that would be helpful. Colin Mackay has an article here[^] about passing data between forms. It's .NET 1.1 IIRC but the principles are still valid
In this situation, you only need the simpler Parent to Child relationship as that method can be used for both writing to and reading from properties. The Child to Parent is only needed when the Child needs to inform the parent when something has changed.
Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn) Why are you using VB6? Do you hate yourself? (Christian Graus)
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Thanks Dave...I'd appreciate that. You are the first one that has given me any kind of answer. I know the tutorial I am using is crappy but I'd still like to solve this particular problem.
Thanks again.
Darrall
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OK, this does the same as the tutorial but it does it correctly. I have included an example of both Parent to Child (Parent reads a property in the child) and Child to Parent (Parent listens for event that the Child raises).
For a beginners tutorial to events, have a look at my Events Made Simple article[^].
Anyway, here's the code - any questions, just ask! I've included all the control creation and initialization so you can copy and paste and it should work without having to add any controls in the designer.
public enum Case
{
None,
Upper,
Lower,
Proper
}
using System;
using System.Drawing;
using System.Windows.Forms;
public partial class FormChild : Form
{
#region Events
public event EventHandler SelectedCaseChanged;
#endregion
#region Fields
private Case selectedCase;
private RadioButton radioUpper;
private RadioButton radioLower;
private RadioButton radioProper;
private Button buttonOK;
private Button buttonCancel;
#endregion
#region Constructors
public FormChild()
{
InitializeComponent();
CustomInitialize();
selectedCase = Case.None;
radioUpper.Tag = Case.Upper;
radioLower.Tag = Case.Lower;
radioProper.Tag = Case.Proper;
}
#endregion
#region Properties
public Case SelectedCase
{
get { return selectedCase; }
private set
{
if (selectedCase != value)
{
selectedCase = value;
OnSelectedCaseChanged(EventArgs.Empty);
}
}
}
#endregion
#region Methods
private void RadioButton_CheckedChanged(object sender, EventArgs e)
{
RadioButton selectedRadio = sender as RadioButton;
if (sender != null)
SelectedCase = (Case)selectedRadio.Tag;
}
protected virtual void OnSelectedCaseChanged(EventArgs e)
{
EventHandler eh = SelectedCaseChanged;
if (eh != null)
eh(this, e);
}
private void CustomInitialize()
{
radioUpper = new RadioButton();
radioLower = new RadioButton();
radioProper = new RadioButton();
buttonOK = new Button();
buttonCancel = new Button();
Text = "Child";
Size = new Size(196, 152);
FormBorderStyle = FormBorderStyle.FixedDialog;
MaximizeBox = false;
MinimizeBox = false;
StartPosition = FormStartPosition.CenterParent;
radioUpper.Text = "&Upper";
radioLower.Text = "&Lower";
radioProper.Text = "&Proper";
radioUpper.Location = new Point(12, 12);
radioLower.Location = new Point(12, 35);
radioProper.Location = new Point(12, 58);
buttonOK.Text = "OK";
buttonCancel.Text = "Cancel";
buttonOK.Location = new Point(93, 81);
buttonCancel.Location = new Point(12, 81);
Controls.AddRange(new Control[]{
radioUpper,
radioLower,
radioProper,
buttonOK,
buttonCancel });
CancelButton = buttonCancel;
AcceptButton = buttonOK;
buttonOK.DialogResult = DialogResult.OK;
radioUpper.CheckedChanged += RadioButton_CheckedChanged;
radioLower.CheckedChanged += RadioButton_CheckedChanged;
radioProper.CheckedChanged += RadioButton_CheckedChanged;
}
#endregion
}
using System;
using System.Drawing;
using System.Globalization;
using System.Windows.Forms;
public partial class FormParent : Form
{
#region Fields
FormChild formChild;
private TextBox textBox;
private Button buttonSetCase;
#endregion
#region Constructors
public FormParent()
{
InitializeComponent();
CustomInitialize();
}
#endregion
#region Methods
private void buttonSetCase_Click(object sender, EventArgs e)
{
formChild = new FormChild();
formChild.SelectedCaseChanged += new EventHandler(formChild_SelectedCaseChanged);
if (formChild.ShowDialog(this) == DialogResult.OK)
CaseText(formChild.SelectedCase);
formChild.Dispose();
formChild = null;
}
private void formChild_SelectedCaseChanged(object sender, EventArgs e)
{
FormChild childForm = sender as FormChild;
if (childForm != null)
CaseText(childForm.SelectedCase);
}
private void CaseText(Case selectedCase)
{
TextInfo textInfo = CultureInfo.CurrentCulture.TextInfo;
switch (selectedCase)
{
case Case.Upper:
textBox.Text = textInfo.ToUpper(textBox.Text);
break;
case Case.Lower:
textBox.Text = textInfo.ToLower(textBox.Text);
break;
case Case.Proper:
textBox.Text = textInfo.ToTitleCase(textBox.Text);
break;
}
}
private void CustomInitialize()
{
textBox = new TextBox();
buttonSetCase = new Button();
Text = "Parent";
Size = new Size(221, 83);
textBox.Location = new Point(12, 14);
buttonSetCase.Location = new Point(118, 12);
buttonSetCase.Text = "&Set Case";
Controls.AddRange(new Control[] {
textBox,
buttonSetCase });
AcceptButton = buttonSetCase;
buttonSetCase.Click += buttonSetCase_Click;
}
#endregion
}
Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn) Why are you using VB6? Do you hate yourself? (Christian Graus)
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Thank you so much for your time and effort. I have spent all day at this and finally got it to work but yours looks much tidier. I will try it out tomorrow and let you know.
Thanks again.
Darrall
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No problem
In addition to my article I previously linked to, I have posted a Tip/Trick here[^] which is a little more concise and should help in understanding the basics of raising/handling events.
Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn) Why are you using VB6? Do you hate yourself? (Christian Graus)
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Thanks again With all your help I should come out on top...maybe
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that is not a tuturial. It's a what to avoid tutorial.
linkig two forms by static fields => really bad
any many other stuff.
Don't use that site unless you want to become
a rumorous c# developer.
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Hi, I have a MatchCollection1 which holds 1,2 and 3
MatchCollection2 holds A, B and C
now I want to print in below order,
1
A
2
B
3
C
how can i do that.
thank you
i think i need to do something like
<pre>
StreamWriter sw = new StreamWriter(@"file.txt");
foreach (Match match in MatchCollection1 )
{
sw.writeline(match);
//TODO get first item of collection in matchcollection2 and delete the first item.
</pre>
I also cant find Item property as stated in this link http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.matchcollection.item.aspx[^]
i dont know the todo part please help?
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It is a bit confusing, what the MSDN page is saying (see its example) is that MatchCollection has an indexer (not really a property), i.e. you can use it as if it were an array; and that solves your problem entirely:
for (int i=0; i<MatchCollection1.Count; i++) {
Console.WriteLine(matchCollection1[i].Value);
Console.WriteLine(matchCollection2[i].Value);
}
which will fail if MatchCollection1 holds more entries than MatchCollection2.
FYI: They use similar words here[^].
Conclusion: it pays to look at the examples!
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. [The QA section does it automatically now, I hope we soon get it on regular forums as well]
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I have CookieContainer, which contained some cookies. How to get cookies from CookieContainer?
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hello_amigo wrote: How to get cookies?
With GetCookies perhaps?
I don't know, I don't really want cookies.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. [The QA section does it automatically now, I hope we soon get it on regular forums as well]
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Try using a search engine to find the answer before asking the question, honest it is quicker. Here is the MSDN [^]result thrown up by google
Never underestimate the power of human stupidity
RAH
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Ok, just simple exsample:
CookieContainer cc = new CookieContainer();
HttpWebRequest r1 = (HttpWebRequest)WebRequest.Create("URI1");
r1.AllowAutoRedirect = false;
r1.CookieContainer = cc;
HttpWebResponse h1 = (HttpWebResponse)r1.GetResponse();
foreach (Cookie c in h1.Cookies)
cc.Add(c);
HttpWebRequest r2 = (HttpWebRequest)WebRequest.Create("URI2");
r2.AllowAutoRedirect = false;
r2.CookieContainer = cc;
HttpWebResponse h2 = (HttpWebResponse)r2.GetResponse();
foreach (Cookie c in h2.Cookies)
cc.Add(c);
After this we have some cookies, which we got in the fist and secont responses. And cc contained this cookies.
Unfortunally, information on MSDN Link don`t explain how to get cookies from CookieContainer, just how to get cookies from concrete response.
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