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c# Get TextSelection on AvalonEdit.TextDocument

I use the AvalonEdit.TextDocument control. Now I want to get the current text-selection/textmark from it. But the class implments no any convenient property or method.
How I can get the current text selection from AvalonEdit.TextDocument?
PS: It does not really make much sense here to add some code from my app

The easiest way I found to deal with selections with an AvalonEdit editor is as follows:
IEnumerable<SelectionSegment> selectionSegments = Editor.TextArea.Selection.Segments;
TextDocument document = Editor.TextArea.Document;
foreach (SelectionSegment segment in selectionSegments)
{
//DO WHAT YOU WANT WITH THE SELECTIONS
int lineStart = document.GetLineByOffset(segment.StartOffset).LineNumber;
int lineEnd = document.GetLineByOffset(segment.EndOffset).LineNumber;
for (int i = lineStart; i <= lineEnd; i++)
{
//Do something with each line in the selection segment
}
}
In my case I needed to mark something on each line selected, so that's why I split it into lines.

Append int to end of string or textbox name in a For Loop C#

I have a C# application in which there are several textboxes with the same name except for a number on the end which starts at 1 and goes to 19. I was hoping to use a for loop to dynamically add values to these text boxes by using an arraylist. There will be situations where there will not be 19 items in the arrayList so some text boxes will be unfilled. Here is my sample code for what I am trying to do. Is this possible to do?
for (int count = 0; count < dogList.Count; count++)
{
regUKCNumTextBox[count+1].Text=(dogList[count].Attributes["id"].Value.ToString());
}

So you've got a collection of text boxes that are to be filled out top-to-bottom? Then yes, a collection of TextBox seems appropriate.
If you stick your TextBox references in an array or a List<TextBox> -- I wouldn't use an ArrayList as it's considered deprecated in favor of List<T> -- then yes, you can do that:
TextBox[] regUKCNumTextBox = new []
{
yourTextBoxA,
yourTextBoxB,
...
};
Then yes your logic is possible, you can also query the control by it's name, though that would be heavier at runtime - so it's a tradeoff. Yes, in this solution you must set up a collection to hold your text box references, but it will be more performant.

Try this:
(By the way I am assuming you use WinForms)
for (int count = 0; count < dogList.Count; count++)
{
object foundTextBox = this.Controls.Find("nameofTextBoxes" + [count+1]);
if (foundTextBox != null)
{
if (foundTextBox is TextBox)
{
((TextBox)foundTextBox).Text=(dogList[count].Attributes["id"].Value.ToString());
}
}
}
With this code you are trying to find a Control form your Forms Controls collection. Then you have to make sure the control is of the TextBox type. When it is; cast it to a TextBox and do what you want with it. In this case; assign a value to the Text property.
It would be more efficient to keep a collection of your TextBoxes like in the solution offered by James Michael Hare

Yikes; something doesn't seem quite right with the overall design there; but looking past that, here's a quick stab at some pseudo code that might work:
for (int count = 0; count < dogList.Count; count++)
{
var stringName = string.Format("myTextBoxName{0}", count);
var ctrl = FindControl(stringName);
if(ctrl == null) continue;
ctrl.Text = dogList[count];
}

Programatically reference ascending variable names (var1, var2, ... )

I'm currently coding a project that can take up to 200 entries of a specific product, as determined by user input. Basically, my GUI loads, and I use jQuery to dynamically build the entries whenever there is a change to the amount field. When using jQuery, I simply give each of them ids in the form of variable1, variable2, ...., variableX (where X is the amount of entries indicated). Small snippet of code to clarify:
for(var i = 1;i <= amount_selected; i++) {
$('table_name tr:last').after('<tr><td><input type="text" id="variable' + i + '"></td></tr>');
}
Now when I try to move to the back end, I'm trying to reference these variable names by putting them in a list. I went ahead and put them in a list of HtmlInputText, to call the Variable names from the list itself. (This would save having to call all (up to 200) methods manually, which is really not an option).
So what I did (in C#) was:
List<HtmlInputText> listvar = new List<HtmlInputText>();
for(int i = 1; i <= amount_selected; i++) {
string j = "variable" + Convert.ToString(i);
HtmlInputText x = j;
listvar.Add((x));
samplemethod(listvar[i]);
}
But it's not working at all. Does anyone have any ideas as to how this would be done, without doing so manually? I know my logic might be completely off, but hopefully this illustrates at least what I'm attempting to do.

I'm assuming these inputs are in a form? If you're submitting then you can access the text boxes from the Request object:
List<string> results = new List<string>();
for (int i = 1; i <= amount_selected; i++)
{
string s = String.Format("{0}", Request.Form["variable" + Convert.ToString(i)]);
results.Add(s);
}

you could do $("#variable" + Convert.ToString(i)).val()

How best to program a 'field colorer' program - quite easy!

Sorry for the weird title, I could't think of anything better!
Anyways, I'm half way through writing a program (Windows Forms App) that reads in a fixed-width file, gathers field lengths from user input, then it's supposed to display each column from the first line of the file in a different color... Do you know what I mean? It's basically to differentiate between the different fields in a fixed-width file using color.
What I wanted to ask was what was the best way to go about this? Because I'm having a lot of trouble, and I keep running into things and just implementing disgusting solutions when I know there is a much better one.
Obviously you don't have to give me a whole program, just some ideas of better ways to go about this - because my solution is just horrendous.
Thank you all in advance!

I would use a RichTextBox. This has an easy way to change the color of text. Here is an example where I have 3 inputs from the user that tells how wide each column should be. Then it reads in a file and colors the widths appropriately. Hopefully this will give you some more ideas.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
ReadFile();
}
private void ReadFile()
{
// Assumes there are 3 columns (and 3 input values from the user)
string[] lines_in_file = File.ReadAllLines(#"C:\Temp\FixedWidth.txt");
foreach (string line in lines_in_file)
{
int offset = 0;
int column_width = (int)ColumnWidth1NumericUpDown.Value;
// Set the color for the first column
richTextBox1.SelectionColor = Color.Khaki;
richTextBox1.AppendText(line.Substring(offset, column_width));
offset += column_width;
column_width = (int)ColumnWidth2NumericUpDown.Value;
// Set the color for the second column
richTextBox1.SelectionColor = Color.HotPink;
richTextBox1.AppendText(line.Substring(offset, column_width));
offset += column_width;
column_width = (int)ColumnWidth3NumericUpDown.Value;
// Make sure we dont try to substring incorrectly
column_width = (line.Length - offset < column_width) ?
line.Length - offset : column_width;
// Set the color for the third column
richTextBox1.SelectionColor = Color.MediumSeaGreen;
richTextBox1.AppendText(line.Substring(offset, column_width));
// Add newline
richTextBox1.AppendText(Environment.NewLine);
}
}
}

Use variable as part of textbox name in C#

I am developing a program wth 30 text boxes and 30 check boxes next to them. I want people to check names and then press the send button. The program then saves the names in a txt file with a true or false statement next to them, it then uploads the file to a ftp server for me analize.
The problem I am facing is that I don't want to write code for every text and check box to load and save it's value on the txt file.
If I name the text boxes something like tbox1;tbox2;tbox3 etc. How would use a loop to say write the value of tbox i + ; + cbox i on line i of thing.txt or vice versa?
Please any help would be grately apreciated because this will save me a lot of unnesacery code writing!

You should create a List<TextBox>, and populate it with your textboxes in the constructor.
You can then loop through the list and process the textboxes.

for (int i = 0; i <= count; i++)
{
TextBox textbox = (TextBox)Controls.Find(string.Format("tbox{0}", i),false).FirstOrDefault();
CheckBox checkbox = (CheckBox)Controls.Find(string.Format("cbox{0}", i),false).FirstOrDefault();
string s = textbox.Text + (checkbox.Checked ? "true" : "false");
}

You can loop over all the controls on your form and retrieve the values from them based on their type/name.

Loop through controls in your form/control and investigate name:
foreach (Control control in f.Controls)
{
if (control is TextBox)
{
//Investigate and do your thing
}
}

Assuming this is ASP.NET, you could use something like this:
StringBuilder sb = new StringBuilder();
for(int i = 1; i < 30; i++){
TextBox tb = FindControl("TextBox" + i);
Checkbox cb = FindControl("CheckBox" + i);
sb.AppendFormat("TextBox{0}={1}; {2}", i, tb.Text, cb.Checked);
}
string result = sb.ToString();
// Now write 'result' to your text file.