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C# - Extract Date from String using StreamReader

How would I go about getting just the date from the following string?
"DateOfTest_01-30-2018-1_003"
This string is in position 8 in a CSV file, which I am looping through and parsing. What I have is:
while (!reader.EndOfStream) {
var splitLine = reader.ReadLine().SplitCommaSeparatedValues();
sample.RunDate = splitLine[8];
WriteLog("Run Date = " + sample.RunDate);}
So I need to extract characters from the string that fall between "_" and "-1" and convert the result to /mm/dd/yyyy format.
Thanks in advance for any assistance!

Better will be regular expression in this case: "(DateOfTest_)(\d{2}-\d{2}-\d{4})(-\d_\d{3})". Second group will be date. In c# you can use Regex.Match. MSDN

Use DateTime.ParseExact:
var culture = System.Globalization.CultureInfo.InvariantCulture;
var strToParse = splitLine[8].Substring(11, 10);
var date = DateTime.ParseExact(strToParse, "MM-dd-yyyy", culture);
var formattedStr = date.ToString("MM/dd/yyyy", culture);

You could use Regex matching to determine date string in the input.
var pattern = #"(?<=_)(.*?)(?=-1)";
var input = "DateOfTest_01-30-2018-1_003";
if (Regex.IsMatch(input, pattern))
{
var dateStr = Regex.Match(input, pattern);
var date = DateTime.ParseExact(dateStr.Value, "MM-dd-yyyy",null);
}

Unless you absolutely need the data at just that exact moment move your date parser outside of your reader.
After that, the answer really relies on whether or not the string in that field is always formatted the same way.
As others have pointed out, if the string is always of the same format you can substring the date out of the string. Then you can either do use one of the several built-in date format methods, or since it is formatted correctly, do a string.Replace("-", "//")
If the string format changes you'll need to try some regex to help you identify the substring to pull out.
My biggest point is that I think you should do this formatting of your field outside of your reader.

string TestString = "DateOfTest_01-30-2018-1_003";
Regex TestRegex = new Regex(#"(DateOfTest_)(\d{2}-\d{2}-20\d{2})(-\d_\d{3})");
string ExactDateFormat = "MM-dd-yyyy";
if (TestRegex.IsMatch(TestString))
{
Date = TestRegex.Match(TestString).Groups[2].ToString();
Date = DateTime.ParseExact(Date, ExactDateFormat, null).ToShortDateString();
}

Decimal Separator In Different Formats creating Issues [duplicate]

I have two nvarchar fields in a database to store the DataType and DefaultValue, and I have a DataType Double and value as 65.89875 in English format.
Now I want the user to see the value as per the selected browser language format (65.89875 in English should be displayed as 65,89875 in German). Now if the user edits from German format to 65,89875 which is 65.89875 equivalent in English, and the other user views from an English browser it comes as 6589875.
This happens because in the database it was stored as 65,89875 in the nvarchar column and when converted using English culture it becomes 6589875 since it considers , as a separator which is a decimal operator for German.
How do I get this working for all the browsers?

You need to define a single locale that you will use for the data stored in the database, the invariant culture is there for exactly this purpose.
When you display convert to the native type and then format for the user's culture.
E.g. to display:
string fromDb = "123.56";
string display = double.Parse(fromDb, CultureInfo.InvariantCulture).ToString(userCulture);
to store:
string fromUser = "132,56";
double value;
// Probably want to use a more specific NumberStyles selection here.
if (!double.TryParse(fromUser, NumberStyles.Any, userCulture, out value)) {
// Error...
}
string forDB = value.ToString(CultureInfo.InvariantCulture);
PS. It, almost, goes without saying that using a column with a datatype that matches the data would be even better (but sometimes legacy applies).

You can change your UI culture to anything you want, but you should change the number separator like this:
CultureInfo info = new CultureInfo("fa-IR");
info.NumberFormat.NumberDecimalSeparator = ".";
Thread.CurrentThread.CurrentCulture = info;
Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture;
With this, your strings converts like this: "12.49" instead of "12,49" or "12/49"

Convert.ToDouble(x) can also have a second parameter that indicates the CultureInfo and when you set it to
System.Globalization.CultureInfo InvariantCulture
the result will allways be the same.

I took some help from MSDN, but this is my answer:
double number;
string localStringNumber;
string doubleNumericValueasString = "65.89875";
System.Globalization.NumberStyles style = System.Globalization.NumberStyles.AllowDecimalPoint;
if (double.TryParse(doubleNumericValueasString, style, System.Globalization.CultureInfo.InvariantCulture, out number))
Console.WriteLine("Converted '{0}' to {1}.", doubleNumericValueasString, number);
else
Console.WriteLine("Unable to convert '{0}'.", doubleNumericValueasString);
localStringNumber =number.ToString(System.Globalization.CultureInfo.CreateSpecificCulture("de-DE"));

You can convert the value user provides to a double and store it again as nvarchar, with the aid of FormatProviders. CultureInfo is a typical FormatProvider. Assuming you know the culture you are operating,
System.Globalization.CultureInfo EnglishCulture = new System.Globalization.CultureInfo("en-EN");
System.Globalization.CultureInfo GermanCulture = new System.Globalization.CultureInfo("de-de");
will suffice to do the neccesary transformation, like;
double val;
if(double.TryParse("65,89875", System.Globalization.NumberStyles.Float, GermanCulture, out val))
{
string valInGermanFormat = val.ToString(GermanCulture);
string valInEnglishFormat = val.ToString(EnglishCulture);
}
if(double.TryParse("65.89875", System.Globalization.NumberStyles.Float, EnglishCulture, out val))
{
string valInGermanFormat = val.ToString(GermanCulture);
string valInEnglishFormat = val.ToString(EnglishCulture);
}

Use InvariantCulture. The decimal separator is always "." eventually you can replace "," by "."
When you display the result , use your local culture. But internally use always invariant culture
TryParse does not allway work as we would expect There are change request in .net in this area:
https://github.com/dotnet/runtime/issues/25868

I have this function in my toolbelt since years ago (all the function and variable names are messy and mixing Spanish and English, sorry for that).
It lets the user use , and . to separate the decimals and will try to do the best if both symbols are used.
Public Shared Function TryCDec(ByVal texto As String, Optional ByVal DefaultValue As Decimal = 0) As Decimal
If String.IsNullOrEmpty(texto) Then
Return DefaultValue
End If
Dim CurAsTexto As String = texto.Trim.Replace("$", "").Replace(" ", "")
''// You can probably use a more modern way to find out the
''// System current locale, this function was done long time ago
Dim SepDecimal As String, SepMiles As String
If CDbl("3,24") = 324 Then
SepDecimal = "."
SepMiles = ","
Else
SepDecimal = ","
SepMiles = "."
End If
If InStr(CurAsTexto, SepDecimal) > 0 Then
If InStr(CurAsTexto, SepMiles) > 0 Then
''//both symbols was used find out what was correct
If InStr(CurAsTexto, SepDecimal) > InStr(CurAsTexto, SepMiles) Then
''// The usage was correct, but get rid of thousand separator
CurAsTexto = Replace(CurAsTexto, SepMiles, "")
Else
''// The usage was incorrect, but get rid of decimal separator and then replace it
CurAsTexto = Replace(CurAsTexto, SepDecimal, "")
CurAsTexto = Replace(CurAsTexto, SepMiles, SepDecimal)
End If
End If
Else
CurAsTexto = Replace(CurAsTexto, SepMiles, SepDecimal)
End If
''// At last we try to tryParse, just in case
Dim retval As Decimal = DefaultValue
Decimal.TryParse(CurAsTexto, retval)
Return retval
End Function

Format Text into Currency C# Monotouch IOS

I´m trying to figure out how to format a text field in a currency, like in the change of the field.
I´ve tried using. string.format, regex but nothing seems to help me.
I would need to get input(i can get this value, just need to format it) and change that to something like:
Input = 12345
Output = R$12.345,00
Thanks in advance.
EDIT: Here is a example of what I´m trying:
string textValue = 12345;
CultureInfo ui_culture = new CultureInfo("pt-BR");
Console.WriteLine(String.Format(ui_culture,"{0:C}",textValue));
It returns the 12345 always.

This would work for you.
string textValue = "12345";
var d = Convert.ToDecimal(textValue);
CultureInfo ui_culture = new CultureInfo("pt-BR");
Console.WriteLine(d.ToString("C", ui_culture));

String.Format Same Code Different View

I have a code like this;
GridView1.FooterRow.Cells[11].Text = String.Format("{0:c}", sumKV)
In my computer this code gives a result like that;
But when I upload this code to my virtual machine it looks like this;
TL means Turkish Liras. But I don't want to show the currency. I just want numbers.
I also don't want to change the formating of numbers. (Like 257.579,02)
How can I only delete TL in this code?

I would use this:
var cultureWithoutCurrencySymbol =
(CultureInfo)CultureInfo.CurrentCulture.Clone();
cultureWithoutCurrencySymbol.NumberFormat.CurrencySymbol = "";
GridView1.FooterRow.Cells[11].Text =
String.Format(cultureWithoutCurrencySymbol, "{0:c}", sumKV).Trim();
Background:
This will still keep the currency formatting for the current culture, it just removes the currency symbol.
You can save this special culture somewhere, so you don't have to create it every time you need to format your values.
UPDATE:
Now it even compiles... ;-)
Added a Trim(), because there is still a space after the formated number.

Another option is to turn off the currency symbol entirely for the current thread:
private static NumberFormatInfo SetNoCurrencySymbol()
{
CultureInfo culture = (CultureInfo)CultureInfo.CurrentCulture.Clone();
NumberFormatInfo LocalFormat = (NumberFormatInfo)NumberFormatInfo.CurrentInfo.Clone();
NumberFormatInfo ret = culture.NumberFormat;
LocalFormat.CurrencySymbol = "";
culture.NumberFormat = LocalFormat;
// Add the culture to the current thread
Thread.CurrentThread.CurrentCulture = culture;
return ret;
}
That way you will change less code. You can always change it back afterwards:
NumberFormatInfo origNumberFormat = SetNoCurrencySymbol();
string x = String.Format("{0:c}", 55);
CultureInfo.CurrentCulture.NumberFormat = origNumberFormat;
string y = String.Format("{0:c}", 55);

Because you are using String.Format with a format string only, sumKV is formatted according to the UI Culture actually used in your application.
GridView1.FooterRow.Cells[11].Text = String.Format("{0:c}", sumKV),
To get rid with currency symbol, use InvariantCulture in String.Format this way :
String.Format(CultureInfo.InvariantCulture, "{0:c}", sumKV);

If you don't want to show currency then don't use the currency formatting code - {0:c}.
Perhaps try something like the following:
GridView1.FooterRow.Cells[11].Text = String.Format("{0:G}", sumKV);
See this article - String.Format doubles

String.Format not converting integers correctly in arabic

I have a problem with String.Format. The following code formats the string correctly apart from the first integer. Current culture is set to Iraqi arabic (ar-IQ):
int currentItem= 1;
string of= "من";
int count = 2;
string formatted = string.Format(CultureInfo.CurrentCulture, "{0}{1}{2}", currentItem, of, count);
The text is formatted right to left and the 2 is converted to an arabic digit, but the 1 isn't.
Any ideas?

The default behaviour for converting numeric values is "Context", which basically means if a number is proceeded by Arabic they display in Arabic (or another "non-Latin" character), if they're not then they display in "standard" European numbers.
You can change that behaviour quite easily though:
var culture = CultureInfo.CurrentCulture;
culture.NumberFormat.DigitSubstitution = DigitShapes.NativeNational; // Always use native characters
string formatted = string.Format(culture, "{0:d}{1:d}{2:d}", currentItem, of, count);
That should work as you expect - more details on MSDN.

I couldn't get either of the other answers to work. This worked for me:
string sOriginal = "1 of 2";
var ci = new CultureInfo("ar-IQ", false);
var nfi = ci.NumberFormat;
string sNative = ReplaceWesternDigitsWithNativeDigits(sOriginal, nfi).Replace("of", "من");
...
private static string ReplaceWesternDigitsWithNativeDigits(string s, NumberFormatInfo nfi)
{
return s.Replace("0", nfi.NativeDigits[0])
.Replace("1", nfi.NativeDigits[1])
.Replace("2", nfi.NativeDigits[2])
.Replace("3", nfi.NativeDigits[3])
.Replace("4", nfi.NativeDigits[4])
.Replace("5", nfi.NativeDigits[5])
.Replace("6", nfi.NativeDigits[6])
.Replace("7", nfi.NativeDigits[7])
.Replace("8", nfi.NativeDigits[8])
.Replace("9", nfi.NativeDigits[9]);
}

var culture = CultureInfo.CurrentCulture;
culture.NumberFormat.DigitSubstitution = DigitShapes.NativeNational;
does not work,
but the following works:
var culture = new CultureInfo("ar-SA");
culture.NumberFormat = new NumberFormatInfo();
Thread.CurrentThread.CurrentCulture = culture;
Thanks for the hint!!!