Convert.ToUInt64 Method (String)
Converts the specified string representation of a number to an equivalent 64-bit unsigned integer.
This API is not CLS-compliant.
Assembly: mscorlib (in mscorlib.dll)
<CLSCompliantAttribute(False)> Public Shared Function ToUInt64 ( value As String ) As ULong
Parameters
- value
-
Type:
System.String
A string that contains the number to convert.
Return Value
Type: System.UInt64A 64-bit signed integer that is equivalent to the number in value, or 0 (zero) if value is null.
| Exception | Condition |
|---|---|
| FormatException | value does not consist of an optional sign followed by a sequence of digits (0 through 9). |
| OverflowException | value represents a number that is less than UInt64.MinValue or greater than UInt64.MaxValue. |
Using the ToInt64(String) method is equivalent to passing value to the Int64.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 UInt64.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.
The following example interprets the elements of a string array as numeric strings and attempts to convert them to unsigned long integers.
Dim values() As String = { "One", "1.34e28", "-26.87", "-18", "-6.00", _ " 0", "137", "1601.9", Int32.MaxValue.ToString() } Dim result As ULong For Each value As String In values Try result = Convert.ToUInt64(value) Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _ value.GetType().Name, value, result.GetType().Name, result) Catch e As OverflowException Console.WriteLine("{0} is outside the range of the UInt64 type.", value) Catch e As FormatException Console.WriteLine("The {0} value '{1}' is not in a recognizable format.", _ value.GetType().Name, value) End Try Next ' The example displays the following output: ' The String value 'One' is not in a recognizable format. ' The String value '1.34e28' is not in a recognizable format. ' The String value '-26.87' is not in a recognizable format. ' -18 is outside the range of the UInt64 type. ' The String value '-6.00' is not in a recognizable format. ' Converted the String value ' 0' to the UInt64 value 0. ' Converted the String value '137' to the UInt64 value 137. ' The String value '1601.9' is not in a recognizable format. ' Converted the String value '2147483647' to the UInt64 value 2147483647.
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1