Tests to see if a string's letters are all upper case. - CSharp System

CSharp examples for System:String Case

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Description

Tests to see if a string's letters are all upper case.

Demo Code

//  Copyright ? 2011, Grid Protection Alliance.  All Rights Reserved.
using System.Text.RegularExpressions;
using System.Text;
using System.IO;//  w w  w  . java 2 s.  c o m
using System.Globalization;
using System.ComponentModel;
using System.Collections.Generic;
using System;

public class Main{
        /// <summary>
        /// Tests to see if a string's letters are all upper case.
        /// </summary>
        /// <param name="value">Input string.</param>
        /// <returns>True, if all string's letter characters are upper case; otherwise, false.</returns>
        public static bool IsAllUpper(this string value)
        {
            if (string.IsNullOrEmpty(value))
                return false;

            value = value.Trim();
            if (value.Length == 0)
                return false;

            for (int x = 0; x < value.Length; x++)
            {
                if (char.IsLetter(value[x]) && !char.IsUpper(value[x]))
                    return false;
            }

            return true;
        }
}

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