Convert.ToInt32 Method (String)
Converts the specified string representation of a number to an equivalent 32-bit signed integer.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
-
Type:
System.String
A string that contains the number to convert.
Return Value
Type: System.Int32A 32-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 Int32.MinValue or greater than Int32.MaxValue. |
Using the ToInt32(String) method is equivalent to passing value to the Int32.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 Int32.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.
The following example attempts to convert each element in a numeric string array to an integer.
Dim values() As String = { "One", "1.34e28", "-26.87", "-18", "-6.00", _ " 0", "137", "1601.9", Int32.MaxValue.ToString() } Dim result As Integer For Each value As String In values Try result = Convert.ToInt32(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 Int32 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. ' Converted the String value '-18' to the Int32 value -18. ' The String value '-6.00' is not in a recognizable format. ' Converted the String value ' 0' to the Int32 value 0. ' Converted the String value '137' to the Int32 value 137. ' The String value '1601.9' is not in a recognizable format. ' Converted the String value '2147483647' to the Int32 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