Develop Reference

Create a hyperlink from a text file in C#

I have a C# project (Win Forms), where a form reads an external text file, and then puts the text in a textbox on the form. What I would like to do is create a hyperlink from the text that the program reads in.
For example, if the text file reads "To go to Google, click HERE [www.google.com]", then I want the program to make "HERE" clickable, and go to www.google.com if HERE is clicked on.
Right now the program can read in the text file and recognize the web address just fine. I just don't know how to make "HERE" clickable.
Note: Due to external factors, I cannot make a button, or LinkLabel, or other object for the user to click on. The word itself has to be the hyperlink (if that is at all possible). Also, I have to read the string from an external file. I can't simply put textBox1.Text = "To go to Google, click HERE [www.google.com]";
Thanks in advance!

The easiest work-around for what you are looking for would be to add a handler for DoubleClick, and then just compare the selected text.
If it must be a single click, you want to use OnClick, and then get the test up to the last space to the left and to the right, and do the same compare.
VERY HACKISH btw.
private void textBox1_DoubleClick(object sender, EventArgs e)
{
if (string.Compare(textBox1.SelectedText.Trim(), "HERE") == 0)
System.Diagnostics.Process.Start("http://www.google.com");
}

Building on the previous response, you might want to add an eventhandler to a label instead. You should be able to format the label to be blue and underlined to look like a link, also.

Add button to copy text in MessageBox

I have a program that contains a list of names, and a button that displays a random name in a MessageBox. Is there any way I can add a button "Copy" next to the OK to the MessageBox, that when clicked copies the name and then closes?
If the above isn't possible, is there a way to enable copying the text in a MessageBox?
Thank you.
edit: My users won't understand Ctrl+C, Highlight and Right Click > Copy is what I'm looking for (if a Copy button isn't possible)

If a user presses Ctrl-C while the MessageBox has focus, the message, the MessageBox caption and the MessageBoxButtons labels are copied to the clipboard.
I googled your title and found this..
Or if you really need a button that says copy you can create your own MessageBox with a new windows form and then do what you want with the buttons. Open it like this to keep the MessageBox feel :
var myMessageBox = new CustomMessageBox();
myMessageBox.ShowDialog();

It sounds like maybe you are looking for the Clipboard class.
Clipboard.SetText(variableWithValue);
There is also another answer here about manipulating the contents of a Message Box.
It also might be easier to simply make a modal dialog that emulates a MessageBox without actually using the MessageBox class.

Custom image enum for MessageBoxResult

I try to create a custom MessageBoxImage for the build in MessageBoxResult
For the custom MessageBoxImage enumeration, I have:
public enum CustomBoxImage
{
Foo = new BitmapImage(new Uri(#"pack://application:,,,/MySoftware;component/Images/foo.png"))
}
and the MessageBoxResult, I have:
MessageBoxResult mrb = MessageBox.Show(
"This will kill you. Are you sure?",
"Kill you",
MessageBoxButton.YesNo, CustomBoxImage.Foo);
But it gives me this error:
Cannot convert from "...CustomBoxImage" to "System.Windows.MessageBoxImage'
How can I insert a customized image enumeration into MessageBoxResult? Or, is it even possible?

You can't customize the message boxes beyond the given options. If you need a fully customized one, you can use a 3rd party component. You can even make a window look fully like a message box and customize it if you really need to.

You can't change the signature of the Show method but you can create a converter between your enumeration and the MessageBoxImage enumeration.
if you want to use things that is not provide by the MessageBox, you can create your own messagebox.

C#: Is there a winforms way to make C# MessageBox Buttons (YesNo) larger?

It would be nice to have larger MessageBox Buttons since the target for this application is a tablet.
DialogResult dialogResult = MessageBox.Show(
message, caption,
MessageBoxButtons.YesNo,
MessageBoxIcon.Question,
MessageBoxDefaultButton.Button2);
switch (dialogResult)
{
case DialogResult.Yes:
// ...

It is a system setting. Tablet PCs are normally already configured to make it easy to tap buttons like this so that it works well in any program, not just yours. To configure your tablet, in Win7, use Control Panel + Display, Personalization, Window Color. Click Advanced appearance settings, select "Message Box" in the Item combo. Increase the font size. Don't be fooled by the poor preview, the button will actually grow. There are additional settings in this dialog you might want to tweak to make it easier to manipulate the UI.

A messagebox is just a simple modal form. You can make one yourself and use ShowDialog()

I'm not sure if it's possible or not, but you could use a simple form instead of a dialog box then you can get the design exactly as you wish.

Winforms way? Do you mean, an "automagically via a property change" way? If so, none that I know of.
You can spin up your own custom dialog/form that is bigger and use it instead. While this is not as automagic as the one line MessageBox.Show(), it is not very difficult.

That's not possible with MessageBox which wraps the native system dialog.
You'll need to produce your own dialog or even better see if there is a way to configure the system to give your app (and all others) bigger buttons.
The downside of rolling your own is that you lose all the functionality that the native one provides.

Yeah, going along with what MattP said, you'll need to create a custom form and then use the ShowDialog() method to display the second form as a modal dialog.
private void button2_Click(object sender, System.EventArgs e) {
using (Form2 xForm = new Form2()) {
if (xForm.ShowDialog(this) == DialogResult.OK) {
// Take some action
}
}
}

You can make a 2nd form, then you can make the buttons as big as you want

Show only one instance of messagebox.show in c#

I have a created a custom keyboard shortcut for my application,
when the user press combination keys of CTRL + ALT + Q, i show
a messagebox "Are you sure you want to log out ?" Then if clicked
YES, i log out of the application.
Problem :
I want to make sure that, only once instance of message box shows.
No matter how many times the user presses the shortcut.
currently it shows multiple message box, on pressing multiple
shortcuts.
How to overcome this ?

From MSDN
A message box is a modal dialog box,
which means no input (keyboard or
mouse click) can occur except to
objects on the modal form. The program
must hide or close a modal form
(typically in response to some user
action) before input to another form
can occur.
File a bug on connect.microsoft.com !
Taking ck's comment into consideration...If you are showing a custom dialog (form) then you need to invoke the form using Form.ShowDialog() and not Show().

A quick and dirty way would be to have a class level boolean variable that tracks when the user is trying to exit. If they are, it's set to true, and your routine to display the dialog box can check this flag, then return without doing anything.

Seems like Singleton Pattern is your option.

I think you can create your own form and use the mymessageboxform.show() method, and check its dialogue result.

You'll want to make your application single instance so it can only be started once.
Single Instance App