this may be simple but im still new to this language.
I'm creating a windows application where is a text box and a a button. What it will do is take the value entered in the text box and create a .txt file with the value entered in the textbox as its content.
I've don this. I have successfully add "5" to the textbox and pressed the button and it will create a txt file with content "5" in it.
My question is, how do I format the value form the text box to something like this xxxxxxx.xxxxx?
So if I enter 5 how do I make it create in text to become 0000005.00000?
Or if I enter 5.4 how do i make it become like this 0000005.40000?
Can anyone shed a light? Or coding sample?
What you have to do is to parse the string from the TextBox into a double and then format it back to string using NumberFormatInfo.
To parse the string, use:
Double d;
Double.TryParse("5.4", out d);
To format to what you want, have a look at these docs and choose the format that you need: http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx
Parse your TextBox text into a double variable (using double.Parse or double.TryParse) and try something like this:
double d = 5.0d;
Console.WriteLine(string.Format("{0:0000000.00000}",d));
d = 5.4d;
Console.WriteLine(string.Format("{0:0000000.00000}",d));
Try the following:
int number = 5;
string content = number.ToString("0000000.00000");
This blog post is good for how to use string.Format - http://blog.stevex.net/string-formatting-in-csharp/
Also MSDN is very helpful - http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx
For example, "if using i enter 5.4 and how do i make it become like this 0000005.40000?":
Take a look at that MSDN link, under heading "The Decimal ("D") Format Specifier":
Console.WriteLine(value.ToString("D8"));
// Displays -00012345
Take a look at that MSDN link, under heading "The Fixed-Point ("F") Format Specifier"
integerNumber = -29541;
Console.WriteLine(integerNumber.ToString("F3",
CultureInfo.InvariantCulture));
// Displays -29541.000
But actually, to achieve what you're looking for then you are probably best using a format string like:
var f = 5.4;
f.ToString("000000000.0000000000000");
// Displays 000000005.4000000000000
First of all, a text box gives you the value as a (text) string. If you want to process it further as a number (which you do), you first need to convert (parse) it. Then, you just format the number the way you want:
var number = Decimal.Parse(textBox.Text);
writer.Write(number.ToString("{0:0000000.00000}", number));
Look up string.Format():
http://alexonasp.net/samples/stringformatting/
Related
While formatting data for excel in C#, I am using this line of code
myValue.Style.Numberformat.Format = "$#,##0.00"
It output this: $1,234.00
But I want to also display the currency code, like this: $1,234 USD or $1,234 MXN
Is there an option for currency code in string format?
Dropping the .00 part from your number format should eliminate the decimal portion:
myValue.Style.Numberformat.Format = "$#,##0"
As far as the units themselves (USD vs MXN) I think that's probably logic you'll need to maintain outside of the NumberFormat method call.
I'm not aware of the logic behind the Style property (ie: what is the type of myValue), but you can probably just put the currency code in the string format:
myValue.Style.Numberformat.Format = "$#,##0.00 USD";
Lookalike demo here.
I am trying to get the string value of an RFID card using C#. When I pass the 1st value, at the start of the string I get a symbol which I cannot identify. When I pass more values, the symbol changes.
I want to convert this string into integer value for further process. When I do that I am getting the error
Input string was not in correct format
I think the unidentified symbol that's preventing me from making this conversion.
Here is my code:
this.textBox1.Text = data;
x = Int32.Parse(data, System.Globalization.NumberStyles.HexNumber);
Console.WriteLine(x);
and also help me to show this x value in a separate textbox.
"and also help me to show this x value in a separate textbox."
I guess you could create a new TextBox and give it the value of x like:
TextBox textBox2 = new TextBox();
textBox2.Text = "This is the content of x: " + x;
textBox2.Show(); //Or textBox2.Visible = true;
I'm not quite sure about how to arrange the textbox since I've just used the GUI designer of VS so far, sorry mate. You could also create a textbox in the GUI Designer make it's visibility on false, until you gave the textbox the value of x and then set it's visibility on true again ;).
Have you tried Convert.ToInt32(yourInput); instead of Parse? I'm also a beginner in C# but maybe the parsing creates the unknown Letter?
I hope I was able to help you at least a bit, wish you a nice day and good luck! :-)
I am using below Property example to make some calculation on textbox and if textbox is null I am assigning zero to it so calculation won't fail as you can see I am using Math.Round and I want to make several checks on these textbox input like
textbox that only accepts numbers I searched and found method 1
I want my textbox to be formated I searched and found Method 2
Now my question is ..
Is there any way to mareg all these method in the property method I am using
so my code won't be like "spaghetti code" ?
is there any better ways to do these checks ?
Thank you in advance
Property example
public double ItemPriceResult
{
get
{
return Math.Round(ItemCost * RevenuePercentage / 100 + ItemCost, 0);
}
}
Method 1
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (System.Text.RegularExpressions.Regex.IsMatch(textBox1.Text, "[^0-9]"))
{
MessageBox.Show("Please enter only numbers.");
textBox1.Text = textBox1.Text.Remove(textBox1.Text.Length - 1);
}
}
Method 2
textBox1.Text = string.Format(System.Globalization.CultureInfo.GetCultureInfo("id-ID"), "{0:#,##0.00}", double.Parse(textBox1.Text));
UPDATE after some answers
MaskedTextBox seems fit my needs I read and searched and below some question
if you kindly would like to help me
I need to use MaskedTextBox because I can set it to accept
number and I can also force number formating so
also I need to make number textboxs easer to read for users
so 1000 will be come 1,000
and 10000 will be come 10,000
then according to Microsoft Docs formating MaskedTextBox to fit my needs
Masked MaskedTextBox with 999,999,999,
second I do not want the PromptCharto be visible I google it but none of search result did it
Try this , it will accept only numbers and u can format the string as u want using regex.
public static string ToMaskedString(this String value)
{
var pattern = "^(/d{2})(/d{3})(/d*)$";
var regExp = new Regex(pattern);
return regExp.Replace(value, "$1-$2-$3");
}
You have a TextBox. Alas you don't tell what kind of TextBox you use. System.Windows.Forms.TextBox? System.Web.UI.MobileControls.TextBox?
You write "if text box is null I am assigning zero to it". I assume that you mean that if no text is entered in the text box you assume that 0 is entered.
Furthermore you want to format the output of the text box whenever the text is changed. So while the operator is typing text you want to change this text? For the operator this is very annoying.
Wouldn't you prefer that the operator is obliged to type his text in the format you desire, helping him visually. For this you may use the class MaskedTextBox
The MaskedTextBox has a property Mask, which forces the operator to type in a certain format. I'm not really familiar with what you do with the format {0:#,##0.00}, but I assume you want the output double in a real format with two digits after the decimal point using the decimal point and the thousand separator as common in the current culture.
via the designer put in initialize component:
this.maskedTextBox1.Mask = "99990.00";
after adding the event for text changed:
private void maskedtextBox1_TextChanged(object sender, EventArgs e)
{
double enteredValue = 0.0; // value to use when empty text box
if (!String.IsNullOrEmpty(this.maskedtextBox1.Text))
{
enteredValue = double.Parse(maskedTextBox1.Text, myFormatProvider)
}
ProcessEnteredValue(enteredValue);
}
}
After your edit, the specifications have changed.
While entering the number in the text box, the operator should not have any visual feedback of the formatting of his number.
The operator is free to enter the real number in any commonly used format.
The value of the text box should not be used while the operator is editing the text box.
Only after editing is finished, the value of the text box should be interpreted for correctness, and if correct it should be used.
The actually used value should be displayed in the text box in a defined format.
The desire not to show any visual feedback while entering is understandable. After all, the program doesn't care whether the operator types 1000, 1000.00, or even 1.0E3.
The MaskedTextBox is especially used to force the operator to enter his number in a given format. Since this is not desired, my advise would be to use a TextBox instead of aMaskedTextBox.
However, because you give the operator the freedom to enter his number in any way he wants, including copy-paste, repairing typing errors, etc. you'll have to add the possibility for the user to express to the program that he has finished entering the number.
An often used method in the windows UI would be a Button. Another possibility would be the enter button. Be aware though that this is not really standard within windows. It might make learning your program a little bit more difficult.
So after the operator notified that he finished editing and the corresponding event function is called, your code could be:
// Get the numberformat to use, use current culture, or your own format
private readonly IFormatProvider myNumberFormat = CultureInfo.CurrentCulture.NumberFormat
private void OperatorFinishedEditing(TextBox box)
{
// read the text and try to parse it to a double
// accepting all common formats of real numbers in the current culture
bool valueOk = true;
double resultValue = 0;
if (!String.IsNullOrEmpty(box.Text))
{
bool valueOk = Double.TryParse(box.Text, out resultValue);
}
if (valueOk)
{
box.Text = FormatResultValue(resultValue);
ProcessValue(resultValue);
}
else
{
ShowInputProblem();
}
}
I've been googling and searching on the site for the answer, but I couldn't find a solution - everywhere people mostly discuss how to add new number format to the document and apply it.
What I need is to get the cell value as a string with applied formatting - i.e. same string as would be displayed by Excel.
I already figured that there's no easy way or built-in function which would return the readymade formatted value for a cell.
So it seems to me that to get the value I need to do two things:
1. Get the format string.
2. Format the cell value using this string.
But I have problems with both steps.
One can easily get CellFormat instance which would contain NumberFormatId:
CellFormat cellFormat = (CellFormat) document.WorkbookPart.WorkbookStylesPart.Stylesheet.CellFormats.ElementAt(cell.StyleIndex);
But how to get the format string with this NumberFormatId, if the id corresponds to one of standard predefined formats? (i.e. is below 160) They are not in the spreadsheet document and I can't believe that they should be hardcoded in the application.
Also, once the format string is somehow obtained, how to apply it to the cell value? So far I understand, the code should check the type of the cell value and if is Number - convert it to string using the format string.
I found this page which mentions using Microsoft.Office.Excel.Interop, but I would prefer to stay with OpenXML SDK only.
Overall, I'm very surprised that it's so difficult to find a definitive answer to this question on the Web as I thought that this would be something which many developers need in their daily work.
Men, this is a hard one... I will be adding here things that i found that could be worth..
First is to get the numbering format of the cell (once you have the CellFormat:
string format = excel.WorkbookPart.WorkbookStylesPart.Stylesheet.NumberingFormats.Elements<NumberingFormat>()
.Where(i => i.NumberFormatId.ToString() == cellFormat.NumberFormatId.ToString())
.First().FormatCode;
For more information about this you can go to: NumberingFormats
Im trying to find out how to apply this format to the cell.CellValue property... I think thats the way you have to go!
Ok, reading the ClosedXml code (its open source), seems to be easy to get the format.
Simply convert the value text to its type (int, double, etc) and call the ToString method passing the format. I was trying do that with the String.Format and didnt work. Ive tested the ToString and it works, but something still missing.
I recommend to you to look at this class and get the code from the method GetFormattedString() as #El G tell in his comment.
Bassicaly you will have to add something like this:
double d = double.Parse(cell.CellValue.InnerText);
string val = d.ToString(format);
Hope it helps you...
If you want to take cell value with applied formatting, same as displayed in Excel, use .Text property of Cell object. Like this:
String formattedValue = cell.Text
This question already has an answer here:
Closed 11 years ago.
Possible Duplicate:
How to handle when the backspace button is pressed and the input panel has digit grouped numbers. E.g. 434,343,334.232.
Basically the question says it all, I'm making a calculator in c# and I'm stuck on this problem. When digit grouping is hit the numbers get separated by commas, when the user hits the backspace button, the commas act like characters that get deleted.
inputPanelTextBox.Text = inputPanelTextBox.Text.Replace(",", "") I put this piece of code under my backspace click event. The problem is that say the panel has 234,232 and the user presses the backspace button, the comma is gone as well as the 2 on the far right.
What I want to happen is the same way the windows 7 calculator does when the digit grouped menu is checked and the user hits the backspace.
Any idea of how to go about this? Thank you so much in advance.
How about you store the number just as a number then format the number to look nice when you output it. The same thing will work with string.Format(). You could reformat the number into the display string every time the user hits backspace or adds a new digit. There are lots of the string format modifiers listed here.
int numWithComma = 3000;
int numWithoutComma = 50;
Console.WriteLine("numWithComma: {0:n}", numWithComma);
Console.WriteLine("numWithoutComma: {0:n}", numWithoutComma);
// prints:
// numWithComma: 3,000.00
// numWithoutComma: 50.00
If I were making this calculator, I would save the number in a double, then when the number needs to be displayed I would run it through a function like this and display the string to the user:
private static string FormatForDisplay(double number)
{
return string.Format("{0:n}", number);
}
How about using a format string when you output the number, that way you don't have to manage commas at all.
double myDouble = 500000.012345
inputPanelTextBox.Text = myDouble.ToString("N", CultureInfo.InvariantCulture);
Its been a while since I've used Visual Studio but I'm pretty sure you can set these format strings directly on text boxes so its simply automatically handled when they type. And its easy as pie to set in the properties if I remember correctly. Check out Standard Numeric Format Strings for a bit more on it.
Also a MaskedTextBox might work as well, set the mask to something like "999,999,999,999.99" and see how that formats different numbers.
Good Luck! :D