Convert String to Double - VB

Question

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

User · Answer

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

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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

User · Answer

I simple used Eval string  and it evaluated as Double

User · Answer

Try looking at Double TryParse   if you are using  NET 1 1 2 0 3 0 3 5 4 0 4 5

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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

[vb.net] Convert String to Double - VB

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