Convert String to Double - VB

Convert String to Double - VB

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Is there an efficient method in VB to check if a string can be converted to a double?

I'm currently doing this by trying to convert the string to a double and then seeing if it throws an exception. But this seems to be slowing down my application.

Try
    ' if number then format it.
    current = CDbl(x)
    current = Math.Round(current, d)
    Return current
Catch ex As System.InvalidCastException
    ' item is not a number, do not format... leave as a string
    Return x
End Try

Try looking at Double.TryParse() if you are using .NET 1.1/2.0/3.0/3.5/4.0/4.5

Convert String to Double - VB, Try looking at Double.TryParse() if you are using .NET 1.1/2.0/3.0/3.5/4.0/4.5. Using the ToDouble (String) method is equivalent to passing value to the Double.Parse (String) method. value is interpreted by using the formatting conventions of the current thread culture. If you prefer not to handle an exception if the conversion fails, you can call the Double.TryParse method instead.


VB.NET Sample Code

Dim A as String = "5.3"
Dim B as Double

B = CDbl(Val(A)) '// Val do hard work

'// Get output 
MsgBox (B) '// Output is 5,3 Without Val result is 53.0

Convert.ToDouble Method (System), To do this, use the ToString(IFormatProvider) and Parse(String, IFormatProvider) methods of that value's type. For example, use Double. Parse when converting a string to a Double , and use Double. VB.NET Sample Code. Dim A as String = "5.3" Dim B as Double B = CDbl(Val(A)) '// Val do hard work '// Get output MsgBox (B) '// Output is 5,3 Without Val result is 53.0


Dim text As String = "123.45"
Dim value As Double
If Double.TryParse(text, value) Then
    ' text is convertible to Double, and value contains the Double value now
Else
    ' Cannot convert text to Double
End If

Type Conversion Functions, Convert a String to a Double. Converting a string to a double is simple: Dim d1 As Double Dim d2 As Double ' You can be explicit d1 = CDbl("12.2") ' Or you can� You should put a break point at the begining of the function and look at the value inside the 5 textbox. I'm pretty sure one of them is empty. Double.TryParse si the best option for converting strings to double since it will tell you if the conversion was done. – the_lotus Oct 1 '12 at 15:29


The international versions:

    Public Shared Function GetDouble(ByVal doublestring As String) As Double
        Dim retval As Double
        Dim sep As String = CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator

        Double.TryParse(Replace(Replace(doublestring, ".", sep), ",", sep), retval)
        Return retval
    End Function

    ' NULLABLE VERSION:
    Public Shared Function GetDoubleNullable(ByVal doublestring As String) As Double?
        Dim retval As Double
        Dim sep As String = CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator

        If Double.TryParse(Replace(Replace(doublestring, ".", sep), ",", sep), retval) Then
            Return retval
        Else
            Return Nothing
        End If
    End Function

Results:

        ' HUNGARIAN REGIONAL SETTINGS (NumberDecimalSeparator: ,)

        ' Clean Double.TryParse
        ' -------------------------------------------------
        Double.TryParse("1.12", d1)     ' Type: DOUBLE     Value: d1 = 0.0
        Double.TryParse("1,12", d2)     ' Type: DOUBLE     Value: d2 = 1.12
        Double.TryParse("abcd", d3)     ' Type: DOUBLE     Value: d3 = 0.0

        ' GetDouble() method
        ' -------------------------------------------------
        d1 = GetDouble("1.12")          ' Type: DOUBLE     Value: d1 = 1.12
        d2 = GetDouble("1,12")          ' Type: DOUBLE     Value: d2 = 1.12
        d3 = GetDouble("abcd")          ' Type: DOUBLE     Value: d3 = 0.0

        ' Nullable version - GetDoubleNullable() method
        ' -------------------------------------------------
        d1n = GetDoubleNullable("1.12") ' Type: DOUBLE?    Value: d1n = 1.12
        d2n = GetDoubleNullable("1,12") ' Type: DOUBLE?    Value: d2n = 1.12
        d3n = GetDoubleNullable("abcd") ' Type: DOUBLE?    Value: d3n = Nothing

VB String Examples: Convert a String to a Double, The conversion will stop and return a True value if the beginning of the String can be converted to an Integer, a Double, or Integer/Double with the� To do this, use the ToString (IFormatProvider) and Parse (String, IFormatProvider) methods of that value's type. For example, use Double.Parse when converting a string to a Double, and use Double.ToString when converting a value of type Double to a string.


I simple used Eval(string) and it evaluated as Double.

Convert String to Double-VBForums, You can use it to convert the string to a double value and it will also return a boolean value to tell you if the parse operation succeeded. Example.. Convert Double to String in VB. 54389 hits. Dim vIn As Double vIn = -4.94065645841247E-324 Dim vOut As String vOut = CStr(vIn) The most viewed convertions in VB.


Converting String To Double, New to C# programming ? These short C# video tutorials will help you learn important C Duration: 2:22 Posted: Feb 21, 2018 Double.Parse(String) method works similarly to Convert.ToDouble() method as it takes a string representation of a number as an argument and converts it to a double-precision floating-point number. The difference is that if the string is “null” then this method does not return zero instead it returns ArgumentNullException.


C# Tutorials For Beginners, data table contain column named as Fld_primary. this column contain value like 0.00 it is double datatype in mysql table.i want store that datatable value in� Convert String to a Numeric Data Type. Check if String is Numeric, IsNumeric; Convert String to Integer, CInt() Convert String to Double, CDbl() Convert String to Long, CLng() Convert String to Single, CSng() Convert String to Decimal, CDec() Convert String to Date. Check if String is a Date, IsDate() Convert a String to a Date, CDate() Numeric


convert string to double in vb.net, Convert string to double (VB.net) : Type Convert � Language Basics � ASP.Net. ' The following statement converts count to a String value. Str = "The total count is " & count Conversion of Strings to Numbers. You can use the Val function to explicitly convert the digits in a string to a number. Val reads the string until it encounters a character other than a digit, space, tab, line feed, or period. The sequences "&O" and