Char.IsLower Method

Definition

Namespace:
System
Assemblies:
System.Runtime.dll, mscorlib.dll, netstandard.dll

Indicates whether a Unicode character is categorized as a lowercase letter.

Overloads

IsLower(Char)

Indicates whether the specified Unicode character is categorized as a lowercase letter.
IsLower(String, Int32)

Indicates whether the character at the specified position in a specified string is categorized as a lowercase letter.

IsLower(Char)

Indicates whether the specified Unicode character is categorized as a lowercase letter.

public:
 static bool IsLower(char c);
public static bool IsLower (char c);
static member IsLower : char -> bool
Public Shared Function IsLower (c As Char) As Boolean

Parameters

c
Char

The Unicode character to evaluate.

Returns

Boolean

true if c is a lowercase letter; otherwise, false.

Examples

The following code example demonstrates IsLower.

using namespace System;
int main()
{
   char ch = 'a';
   Console::WriteLine( Char::IsLower( ch ) ); // Output: "True"
   Console::WriteLine( Char::IsLower(  "upperCase", 5 ) ); // Output: "False"
}


using System;

public class IsLowerSample {
    public static void Main() {
        char ch = 'a';

        Console.WriteLine(Char.IsLower(ch));				// Output: "True"
        Console.WriteLine(Char.IsLower("upperCase", 5));	// Output: "False"
    }
}

Module IsLowerSample

    Sub Main()

        Dim ch As Char
        ch = "a"c

        Console.WriteLine(Char.IsLower(ch))                 ' Output: "True"
        Console.WriteLine(Char.IsLower("upperCase", 5))     ' Output: "False"

    End Sub

End Module

Remarks

Valid lowercase letters are members of the following category in UnicodeCategory: LowercaseLetter.

See also

IsLower(String, Int32)

Indicates whether the character at the specified position in a specified string is categorized as a lowercase letter.

public:
 static bool IsLower(System::String ^ s, int index);
public static bool IsLower (string s, int index);
static member IsLower : string * int -> bool
Public Shared Function IsLower (s As String, index As Integer) As Boolean

Parameters

s
String

A string.

index
Int32

The position of the character to evaluate in s.

Returns

Boolean

true if the character at position index in s is a lowercase letter; otherwise, false.

Exceptions

ArgumentNullException

s is null.

ArgumentOutOfRangeException

index is less than zero or greater than the last position in s.

Examples

The following code example demonstrates IsLower.

using namespace System;
int main()
{
   char ch = 'a';
   Console::WriteLine( Char::IsLower( ch ) ); // Output: "True"
   Console::WriteLine( Char::IsLower(  "upperCase", 5 ) ); // Output: "False"
}


using System;

public class IsLowerSample {
    public static void Main() {
        char ch = 'a';

        Console.WriteLine(Char.IsLower(ch));				// Output: "True"
        Console.WriteLine(Char.IsLower("upperCase", 5));	// Output: "False"
    }
}

Module IsLowerSample

    Sub Main()

        Dim ch As Char
        ch = "a"c

        Console.WriteLine(Char.IsLower(ch))                 ' Output: "True"
        Console.WriteLine(Char.IsLower("upperCase", 5))     ' Output: "False"

    End Sub

End Module

Remarks

Character positions in a string are indexed starting from zero.

Valid lowercase letters are members of the following category in UnicodeCategory: LowercaseLetter.

See also

Applies to