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Char.IsLower Method

Definition

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

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

Overloads

Name Description
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.

Examples

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"
 }
}

open System

let ch = 'a'

printfn $"{Char.IsLower ch}" // Output: "True"
printfn $"""{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

IsLower(Char)

Source:
Char.cs
Source:
Char.cs
Source:
Char.cs
Source:
Char.cs
Source:
Char.cs

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

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

Remarks

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

See also

Applies to

IsLower(String, Int32)

Source:
Char.cs
Source:
Char.cs
Source:
Char.cs
Source:
Char.cs
Source:
Char.cs

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

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

Exceptions

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

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

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