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Char.IsLower Method (String, Int32)

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

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

public static bool IsLower(
	string s,
	int index
)

Parameters

s
Type: System.String

A string.

index
Type: System.Int32

The position of the character to evaluate in s.

Return Value

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

ExceptionCondition
ArgumentNullException

s is null.

ArgumentOutOfRangeException

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

Character positions in a string are indexed starting from zero.

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

The following code example demonstrates IsLower.

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"
	}
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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