Develop Reference

Convert decimal currency to comma separated value

I get from a webservice the following strings:
12.95
or
1,200.99
Is there an option to convert these values to the following values without manipulating the string?
12,95
or
1200,99
I tried it with some Culture options but didn't get it right...
EDIT
I tried this:
//return string.Format( "{0:f2}", Convert.ToDecimal( price ) );
//return string.Format(CultureInfo.GetCultureInfo("de-de"), "{0:0}", price);
NumberFormatInfo format = new System.Globalization.NumberFormatInfo();
format.CurrencyDecimalDigits = 2;
format.CurrencyDecimalSeparator = ",";
format.CurrencyGroupSeparator = "";
return decimal.Parse(price).ToString(format);

var input = "1,200.99";
//Convert to decimal using US culture (or other culture using . as decimal separator)
decimal value = decimal.Parse(input, CultureInfo.GetCultureInfo("en-US"));
//Convert to string using DE culture (or other culture using , as decimal separator)
string output = value.ToString(CultureInfo.GetCultureInfo("de-DE"));
Console.WriteLine(output); //1200,99

What about something like this:
double number;
double.TryParse("1,200.99", NumberStyles.Any, CultureInfo.CreateSpecificCulture("en-US"), out number);
var formattedNumber = number.ToString(CultureInfo.CreateSpecificCulture("de-DE"));
Then return or write out formattedNumber (whatever you need to do).

Yes and no. First, what you have is a string, and so you cannot change the formatting of it as you're attempting to. However, to achieve what you would like, you can parse the string into a decimal value and then use the formatting options for decimals to display it in any reasonable way.

You may try for something like this:
String.Format("{0:#,###0}", 0);
or may be like this:
string str = yourNumber.Remove(",").Replace(".",",");

Close enough tronc,
Try this snippet:
String curStr = "12.95";
Decimal decVal;
var valid = Decimal.TryParse(curStr, out decVal);
if (!valid) throw new Exception("Invalid format.");
String newFormat = decVal.ToString("C", System.Globalization.CultureInfo.CreateSpecificCulture("de-DE"));
Within the toString(...) call, you can append a number after 'C' to specify how many decimal places should follow. E.g "C3".

Convert string value to decimal with thousand separator?

This might be a very simple question.
Suppose text box show value 10,000.12 when user edits data by mistake he remove first two numbers like ,000.12 and using this textbox in the calculation then it gives an exception. I want a just validate text box.
For Example:
string str = ",100.12;"
Convert to
decimal number = 100.12;
Any Idea?.
It shows only whole number when user remove any thousand separator.

This is pretty messed up and I am not sure if all of you strings will look the same, but in case they do this might do the trick:
string str = ",0,100.12";
decimal number;
bool converted = decimal.TryParse(str.Substring(str.LastIndexOf(",") + 1), out number);
The variable converted will tell you whether or not your string was converted and you will not an exception.
Good luck!

If I understood the question, you want to remove all characters that would prevent the parse routine from failing.
string str = ",0,100.12";
var modified = new StringBuilder();
foreach (char c in str)
{
if (Char.IsDigit(c) || c == '.')
modified.Append(c);
}
decimal number= decimal.Parse(modified.ToString());

string a = "100.12";
decimal b = Convert.ToDecimal(a);

string str = ",0,100.12;";
var newstr = Regex.Replace(str,#"[^\d\.]+","");
decimal d = decimal.Parse(newstr, CultureInfo.InvariantCulture);

Formatting a string number

I want to format a string number. For example:
double number="118176";
It should look like 1181.71 or 1181,71.
I couldn't find any format type. I tried some of format types as ToString("#,0") but it didn't work.
Thanks for any advice.

First of all: a double variable can not take a string. But that aside, something like this should help:
double number = 1181.76;
string output = String.Format("{0:d2}", number);
This takes the number and creates a string from it using the decimal number format with 2 decimal places.
What you didn't say is why you expect the integer 118176 to magically turn into a double with two decimals? The only way would be
double number = 118176;
string output = String.Format("{0:d2}", number / 100.0);
EDIT
Doing what you describe in your comment is a bit more complex:
string priceString = nodeFareList.SelectSingleNode("GenQuoteDetails/TotAmt").InnerText;
double priceDouble = Convert.ToDouble(priceString) / 100.0;
price.InnerHtml += String.Format("{0:c}", priceDouble);
This converts the number in priceDouble to a string with the value formatted like a currency. If you do not want the currency symbol, use the following:
price.InnerHtml += String.Format("{0:d2}", priceDouble);

See Fixed-point on this page (assuming .net): http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx
You'll have to divide by 100 first though.

I think, what you are looking for is this:
String.Format("{0:0,0.0}", 12345.67);
String.Format("{0:0,0}", 12345.67);
See here for details.

Use can refer the below code in case of Java.
1) First define the Decimal Format instance.
DecimalFormat decimalFormat = new DecimalFormat("####.##");
2) Then pass the decimal value to the 'format' method
String dummyString = decimalFormat.format(pressureValue).toString()
where pressureValue - Decimal number
Hope this will be useful.

How to Parse a String to Double

Here is my string
20.0e-6
I'm parsing it like
String Ans=Double.Parse("20.0e-6")
Now i'm getting the result like 2E-05
But the required output should be like
0.00002
How to get this?

The result of Double.Parse is a Double, not a string. You need to output a string from the double, using ToString.
You should also use an overload of Double.Parse that has a NumberStyles parameter. Using the Float value allows exponent notation:
string Ans=Double.Parse("20.0e-6", NumberStyles.Float).ToString("0.#####");
If you don't want to risk exceptions (InvlidCastException for example), you can use TryParse:
Double res;
if (Double.TryParse("20.0e-6", NumberStyles.Float,
CultureInfo.InvariantCulture ,res))
{
string Ans = res.ToString("0.#####");
}

It's the same number, but if you want to modify the output of the string, use a formatter on your ToString()
http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx
So
String Ans=Double.Parse("20.0e-6").ToString("0.0####")

One way to get the result you want is to use String.Format as follow:
double x = 20.0e-6;
string y = string.Format("{0:0.######}",x);
Console.WriteLine(y);
Given your example, this outputs the value 0.00002
EDIT
I've just realised that this is actually the opposite of your question so in the aim of keeping the answer useful i'll add the following:
Given a string, you can parse as double and then apply the same logic as above. Probably not the most elegant solution however it offers another way to get the result you want.
string x = "20.0e-6";
var y = double.Parse(p);
Console.WriteLine(String.Format("{0:0.######}",y));

Replace dot(.) with comma(,) using RegEx?

I am working on a C# application. I want to change number decimal figure with comma(,) where i have dot(.) using regular expression.
For example:
Price= 100,00.56
As this international rule of representing numeric values but I Sweden they have different ways for numbers Like
Price= 100.00,56
So i want to change dot(.) into comma(,) and comma(,) into dot(.) using RegEx. Could guide me about this.

When formatting numbers, you should use the string format overload that takes a CultureInfo object. The culture name for swedish is "sv-SE", as can be seen here.
decimal value = -16325.62m;
Console.WriteLine(value.ToString(CultureInfo.CreateSpecificCulture("sv-SE")));
Edit:
As #OregonGhost points out - parsing out numbers should also be done with CultureInfo.

Not a RegEx solution but from my experience - more correct:
public static string CheckDecimalDigitsDelimiter(this string instance)
{
var sv = new CultureInfo("sv-SE");
var en = new CultureInfo("en-US");
decimal d;
return (!Decimal.TryParse(instance, NumberStyles.Currency, sv, out d) &&
Decimal.TryParse(instance, NumberStyles.Currency, en, out d)) ?
d.ToString(sv) : // didn't passed by SV but did by EN
instance;
}
What does this method do? It ensures that if given string is incorrect Sweden string but is correct English - convert it to Sweden, e.g. 100,00 -> 100,00 but 100.00 -> 100,00.

You can do this even without regex. For example
var temp = price.Replace(".", "<TEMP>");
var temp2 = temp.Replace(",", ".");
var replaced = temp2.Replace("<TEMP>", ",");

Also have a look at
System.Globalization.CultureInfo.CurrentCulture.NumberFormat.CurrencyDecimalSeparator

Not sure what 100,00.56 represents, did you mean 10.000,56?
To answer your question:
For such a simple task, why use RegEx? You can do it much easier:
string oldValue = "100,00.56";
char dummyChar = '&'; //here put a char that you know won't appear in the strings
var newValue = oldValue.Replace('.', dummyChar)
.Replace(',', '.')
.Replace(dummyChar, ',');
Edit
I agree with #Oded, for formatting numbers use the CultureInfo class.

Do not rely on RegExp for this kind of thing :) Use the build in cultures fx:
decimal s = decimal.Parse("10,000.56", NumberStyles.Currency, CultureInfo.GetCultureInfo("en-US"));
string output = s.ToString("N",CultureInfo.GetCultureInfo("da-DK"));
en-US will parse it correctly and da-DK uses the other kind of representation. I live in DK and therefore use that but you should use the culture which fits your output.