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Convert.ToUInt64 Method (String)
May 02, 2013
Converts the specified String representation of a number to an equivalent 64-bit unsigned integer.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
- Type: System.String
A String containing a number to convert.
Return Value
Type: System.UInt64A 64-bit signed integer equivalent to the value of value.
-or-
Zero if value is null.
| Exception | Condition |
|---|---|
| FormatException | value does not consist of an optional sign followed by a sequence of digits (zero through nine). |
| OverflowException | value represents a number less than MinValue or greater than MaxValue. |
The return value is the result of invoking the Int64.Parse method on value.
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 code example converts String representations of 64-bit unsigned integers with the ToUInt64 method, using default formatting.
// Example of the Convert.ToUInt64( string ) and // Convert.ToUInt64( string, IFormatProvider ) methods. using System; using System.Globalization; class Example { static string format = "{0,-24}{1,-22}{2}"; // Get the exception type name; remove the namespace prefix. static string GetExceptionType(Exception ex) { string exceptionType = ex.GetType().ToString(); return exceptionType.Substring( exceptionType.LastIndexOf('.') + 1); } static void ConvertToUInt64(System.Windows.Controls.TextBlock outputBlock, string numericStr, IFormatProvider provider) { object defaultValue; object providerValue; // Convert numericStr to UInt64 without a format provider. try { defaultValue = Convert.ToUInt64(numericStr); } catch (Exception ex) { defaultValue = GetExceptionType(ex); } // Convert numericStr to UInt64 with a format provider. try { providerValue = Convert.ToUInt64(numericStr, provider); } catch (Exception ex) { providerValue = GetExceptionType(ex); } outputBlock.Text += String.Format(format, numericStr, defaultValue, providerValue) + "\n"; } public static void Demo(System.Windows.Controls.TextBlock outputBlock) { // Create a NumberFormatInfo object and set several of its // properties that apply to numbers. NumberFormatInfo provider = new NumberFormatInfo(); // These properties affect the conversion. provider.NegativeSign = "neg "; provider.PositiveSign = "pos "; // These properties do not affect the conversion. // The input string cannot have decimal and group separators. provider.NumberDecimalSeparator = "."; provider.NumberGroupSeparator = ","; provider.NumberGroupSizes = new int[] { 3 }; outputBlock.Text += String.Format("This example of\n" + " Convert.ToUInt64( string ) and \n" + " Convert.ToUInt64( string, IFormatProvider ) " + "\ngenerates the following output. It converts " + "several strings to \nulong values, using " + "default formatting or a NumberFormatInfo object.\n") + "\n"; outputBlock.Text += String.Format(format, "String to convert", "Default/exception", "Provider/exception") + "\n"; outputBlock.Text += String.Format(format, "-----------------", "-----------------", "------------------") + "\n"; // Convert strings, with and without an IFormatProvider. ConvertToUInt64(outputBlock, "123456789012", provider); ConvertToUInt64(outputBlock, "+123456789012", provider); ConvertToUInt64(outputBlock, "pos 123456789012", provider); ConvertToUInt64(outputBlock, "123456789012.", provider); ConvertToUInt64(outputBlock, "123,456,789,012", provider); ConvertToUInt64(outputBlock, "18446744073709551615", provider); ConvertToUInt64(outputBlock, "18446744073709551616", provider); ConvertToUInt64(outputBlock, "-1", provider); } } /* This example of Convert.ToUInt64( string ) and Convert.ToUInt64( string, IFormatProvider ) generates the following output. It converts several strings to ulong values, using default formatting or a NumberFormatInfo object. String to convert Default/exception Provider/exception ----------------- ----------------- ------------------ 123456789012 123456789012 123456789012 +123456789012 123456789012 FormatException pos 123456789012 FormatException 123456789012 123456789012. FormatException FormatException 123,456,789,012 FormatException FormatException 18446744073709551615 18446744073709551615 18446744073709551615 18446744073709551616 OverflowException OverflowException -1 OverflowException FormatException */
