ToInt32 Method (Object)

Convert.ToInt32 Method (Object)


Converts the value of the specified object to a 32-bit signed integer.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public static int ToInt32(
	object value


Type: System.Object

An object that implements the IConvertible interface, or null.

Return Value

Type: System.Int32

A 32-bit signed integer equivalent to value, or zero if value is null.

Exception Condition

value is not in an appropriate format.


value does not implement the IConvertible interface.


The conversion is not supported.


value represents a number that is less than Int32.MinValue or greater than Int32.MaxValue.

Ifvalue is not null, this method wraps a call to the IConvertible.ToInt32implementation of the underlying type of value.

The following example attempts to convert each element in an object array to an integer.

object[] values = { true, -12, 163, 935, 'x', new DateTime(2009, 5, 12),
                    "104", "103.0", "-1",
                    "1.00e2", "One", 1.00e2, 16.3e42};
int result;

foreach (object value 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 (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.",
                        value.GetType().Name, value);
   catch (FormatException) {
      Console.WriteLine("The {0} value {1} is not in a recognizable format.",
                        value.GetType().Name, value);
   catch (InvalidCastException) {
      Console.WriteLine("No conversion to an Int32 exists for the {0} value {1}.",
                        value.GetType().Name, value);

// The example displays the following output:
//    Converted the Boolean value True to the Int32 value 1.
//    Converted the Int32 value -12 to the Int32 value -12.
//    Converted the Int32 value 163 to the Int32 value 163.
//    Converted the Int32 value 935 to the Int32 value 935.
//    Converted the Char value x to the Int32 value 120.
//    No conversion to an Int32 exists for the DateTime value 5/12/2009 12:00:00 AM.
//    Converted the String value 104 to the Int32 value 104.
//    The String value 103.0 is not in a recognizable format.
//    Converted the String value -1 to the Int32 value -1.
//    The String value 1.00e2 is not in a recognizable format.
//    The String value One is not in a recognizable format.
//    Converted the Double value 100 to the Int32 value 100.
//    The Double value 1.63E+43 is outside the range of the Int32 type.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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