Char.IsUpper Method

Definition

Namespace:

System

Assemblies:

netstandard.dll, System.Runtime.dll

Indicates whether a Unicode character is categorized as an uppercase letter.

Overloads

Name	Description
IsUpper(String, Int32)	Indicates whether the character at the specified position in a specified string is categorized as an uppercase letter.
IsUpper(Char)	Indicates whether the specified Unicode character is categorized as an uppercase letter.

IsUpper(String, Int32)

Source:

Char.cs

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

public:
 static bool IsUpper(System::String ^ s, int index);

public static bool IsUpper(string s, int index);

static member IsUpper : string * int -> bool

Public Shared Function IsUpper (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 an uppercase letter; otherwise, false.

Exceptions

ArgumentNullException

s is null.

ArgumentOutOfRangeException

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 uppercase letters are members of the following category in UnicodeCategory: UppercaseLetter.

See also

• Boolean
• String

IsUpper(Char)

Source:

Char.cs

Indicates whether the specified Unicode character is categorized as an uppercase letter.

public:
 static bool IsUpper(char c);

public static bool IsUpper(char c);

static member IsUpper : char -> bool

Public Shared Function IsUpper (c As Char) As Boolean

Parameters

c

Char

The Unicode character to evaluate.

Returns

Boolean

true if c is an uppercase letter; otherwise, false.

Remarks

Valid uppercase letters are members of the following category in UnicodeCategory: UppercaseLetter.

See also

• IsUpper(Rune)
• Boolean
• System.Text.Rune.IsLower(System.Text.Rune)
• System.Char.IsLower(System.Char)