Type.IsEnumDefined(Object) Method is used to return a value which indicates whether the specified value exists in the current enumeration type.
Syntax: public virtual bool IsEnumDefined (object value);
Here, it takes the value to be tested.Return Value: This method returns true if the specified value is a member of the current enumeration type otherwise, false.
Exceptions:
- ArgumentException: If the current type is not an enumeration.
- ArgumentNullException: If the value is null.
- InvalidOperationException: If the value is of a type that cannot be the underlying type of an enumeration.
Below programs illustrate the use of Type.IsEnumDefined(Object) Method:
Example 1:
// C# program to demonstrate the // Type.IsEnumDefined(Object) Method using System;
using System.Globalization;
using System.Reflection;
class GFG {
// defining enum enu
public enum enu {A, B, C};
// Main Method
public static void Main()
{
// try-catch block for handling Exception
try {
// creating and initializing object Type
object value = enu.A;
// checking for the current enumeration type
// by using IsEnumDefined() Method
bool status = typeof (enu).IsEnumDefined(value);
// display the result
if (status)
Console.WriteLine( "specified value is a member" +
" of the current enumeration type" );
else
Console.WriteLine( "specified value is not" +
" present in the current enumeration type" );
}
// catch ArgumentNullException here
catch (ArgumentNullException e) {
Console.WriteLine( "Object is null." );
Console.Write( "Exception Thrown: " );
Console.Write( "{0}" , e.GetType(), e.Message);
}
// catch ArgumentNullException here
catch (InvalidOperationException e) {
Console.WriteLine( "Object is null." );
Console.Write( "Exception Thrown: " );
Console.Write( "{0}" , e.GetType(), e.Message);
}
// catch ArgumentException here
catch (ArgumentException e) {
Console.WriteLine( "Object is null." );
Console.Write( "Exception Thrown: " );
Console.Write( "{0}" , e.GetType(), e.Message);
}
}
} |
Output:
specified value is a member of the current enumeration type
Example 2:
// C# program to demonstrate the // Type.IsEnumDefined(Object) Method using System;
using System.Globalization;
using System.Reflection;
class GFG {
// defining enum enu
public enum enu {A, B, C};
// Main Method
public static void Main()
{
// try-catch block for handling Exception
try {
// creating and initializing object Type
object value = enu.B;
// checking for the current enumeration type
// by using IsEnumDefined() Method
bool status = typeof ( int ).IsEnumDefined(value);
// display the result
if (status)
Console.WriteLine( "specified value is a member" +
" of the current enumeration type" );
else
Console.WriteLine( "specified value is not" +
" present in the current enumeration type" );
}
// catch ArgumentNullException here
catch (ArgumentNullException e) {
Console.WriteLine( "value is null." );
Console.Write( "Exception Thrown: " );
Console.Write( "{0}" , e.GetType(), e.Message);
}
// catch ArgumentException here
catch (ArgumentException e) {
Console.WriteLine( "The current type is not an enumeration." );
Console.Write( "Exception Thrown: " );
Console.Write( "{0}" , e.GetType(), e.Message);
}
}
} |
Output:
The current type is not an enumeration. Exception Thrown: System.ArgumentException
Example 3:
// C# program to demonstrate the // Type.IsEnumDefined(Object) Method using System;
using System.Globalization;
using System.Reflection;
class GFG {
// defining enum enu
public enum enu {A, B, C};
// Main Method
public static void Main()
{
// try-catch block for handling Exception
try {
// creating and initializing object Type
object value = null ;
// checking for the current enumeration type
// by using IsEnumDefined() Method
bool status = typeof (enu).IsEnumDefined(value);
// display the result
if (status)
Console.WriteLine( "specified value is a member" +
" of the current enumeration type" );
else
Console.WriteLine( "specified value is not" +
" present in the current enumeration type" );
}
// catch ArgumentNullException here
catch (ArgumentNullException e) {
Console.WriteLine( "value is null." );
Console.Write( "Exception Thrown: " );
Console.Write( "{0}" , e.GetType(), e.Message);
}
// catch ArgumentException here
catch (ArgumentException e) {
Console.WriteLine( "The current type is not an enumeration." );
Console.Write( "Exception Thrown: " );
Console.Write( "{0}" , e.GetType(), e.Message);
}
}
} |
Output:
value is null. Exception Thrown: System.ArgumentNullException
Reference: