空格字符由 Unicode 标准定义。 方法IsNullOrWhiteSpace将返回 值的任何字符解释为空白字符传递给Char.IsWhiteSpace方法时返回的值true。 适用于 产品版本 .NETCore 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10 ...
It returns true if the string is empty or consists solely of whitespace, and false otherwise. String str1 = ""; // Empty string String str2 = " "; // String with whitespace characters String str3 = "Hello, World!"; // Non-whitespace string boolean isStr1Blank = str1.isBlank();...
boolbool7 =string.IsNullOrEmpty("");//true boolbool8 =string.IsNullOrEmpty(null);//true boolbool9 =string.IsNullOrEmpty(" ");//false 8)IsNullOrEmpty()方法,检查指定的字符串是否为string.Empty、null或仅由空白字符组成。示例: boolbool10 =string.IsNullOrWhiteSpace("");//true boolbool11 =string.Is...
Example 1: Check if String is Empty or Null class Main { public static void main(String[] args) { // create null, empty, and regular strings String str1 = null; String str2 = ""; String str3 = " "; // check if str1 is null or empty System.out.println("str1 is " + is...
Write-Host "Given string is NULL or having WHITESPACE" } else { Write-Host "Given string has a value" } $string1 = " " IF([string]::IsNullOrWhiteSpace($string1)) { Write-Host "Given string is NULL or having WHITESPACE" } else { ...
Limited to null and empty checks: This approach specifically focuses on null and empty string checks. If you need to perform more complex validations, such as whitespace trimming, you might need to incorporate additional logic. Readability: As the number of conditions increases, the code might bec...
Character.isWhitespace(int) stripLeading public String stripLeading() Returns a string whose value is this string, with all leading white space removed. If this String object represents an empty string, or if all code points in this string are white space, then an empty string is returned....
.NET Framework 3.5 SP1 和舊版會維護一份內部空格符清單,如果 trimChars 是null 或空陣列,此方法會修剪這個清單。 從 .NET Framework 4 開始,如果 trimChars 是null 或空陣列,此方法會修剪所有 Unicode 空格符(也就是當字元傳遞至 IsWhiteSpace(Char) 方法時產生 true 傳回值的字元)。 由於這項變更,.NET...
footer> </element > """;// The line "<element attr = "content">" starts in the first column.// All whitespace left of that column is removed from the string.stringrawStringLiteralDelimiter ="""Rawstringliterals are delimitedbyastringof at least threedoublequotes, likethis:""" """; ...
if (str == null || (strLen = str.length()) == 0) { return true; } for (int i = 0; i < strLen; i++) { if ((Character.isWhitespace(str.charAt(i)) == false)) { return false; } } return true; } 1. 2. 3.