{"id":7892,"date":"2024-04-13T23:25:05","date_gmt":"2024-04-13T15:25:05","guid":{"rendered":"https:\/\/zyrastory.com\/?p=7892"},"modified":"2024-04-13T23:25:08","modified_gmt":"2024-04-13T15:25:08","slug":"compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case","status":"publish","type":"post","link":"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/","title":{"rendered":"Compare strings or characters for equality in C# (ignoring case)"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_66_1 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >\u5167\u5bb9\u76ee\u9304<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/#what-happened\" title=\"What happened\">What happened<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/#solution\" title=\"Solution\">Solution<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/#string-section\" title=\"String Section\">String Section<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/#method-1-%e2%80%93-stringcompare\" title=\"Method 1 &#8211; string.Compare\">Method 1 &#8211; string.Compare<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/#method-2-%e2%80%93-convert-to-the-same-case-before-comparison\" title=\"Method 2 &#8211; Convert to the Same Case Before Comparison\">Method 2 &#8211; Convert to the Same Case Before Comparison<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/#character-section\" title=\"Character Section\">Character Section<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/#%e2%9a%a0%ef%b8%8fmethod-1-%e2%80%93-using-ascii-codes\" title=\"\u26a0\ufe0fMethod 1 &#8211; Using ASCII Codes\">\u26a0\ufe0fMethod 1 &#8211; Using ASCII Codes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/#method-2-%e2%80%93-convert-to-the-same-case-before-comparison-2\" title=\"Method 2 &#8211; Convert to the Same Case Before Comparison\">Method 2 &#8211; Convert to the Same Case Before Comparison<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/#conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"what-happened\"><\/span><strong>What happened<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>When solving problems on platforms like <strong><em>Codeforces <\/em><\/strong>or <strong><em>LeetCode<\/em><\/strong>, it&#8217;s common to encounter situations where you need to compare <strong>characters <\/strong>or <strong>strings <\/strong>for equality while ignoring case. Here are some commonly used approaches that I&#8217;ve documented.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"solution\"><\/span><strong>Solution<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"string-section\"><\/span><strong>String Section<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"method-1-%e2%80%93-stringcompare\"><\/span><strong>Method 1 &#8211; string.Compare<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-csharp\" data-lang=\"C#\"><code>string.Compare(strA, strB , StringComparison.OrdinalIgnoreCase);<\/code><\/pre><\/div>\n\n\n\n<p>To achieve a case-insensitive comparison, you can use <strong><em>StringComparison.OrdinalIgnoreCase<\/em><\/strong> along with <strong><em>string.Compare<\/em><\/strong>.<\/p>\n\n\n\n<p>When using this approach, the return values have the following meanings:<\/p>\n\n\n\n<ul>\n<li><strong>0<\/strong>: The strings are considered equal when compared ignoring case.<\/li>\n\n\n\n<li><strong>Less than 0<\/strong>: strA is considered lexicographically less than strB.<\/li>\n\n\n\n<li><strong>Greater than 0<\/strong>: strA is considered lexicographically greater than strB.<\/li>\n<\/ul>\n\n\n\n<p>For an actual problem example, refer to <a href=\"https:\/\/zyrastory.com\/en\/coding-en\/codeforces-en\/codeforces-1703a-yes-or-yes-solution-and-explanation-en\/\" target=\"_blank\" rel=\"noreferrer noopener\">Codeforces 1703A YES or YES? Solution &amp; Explanation<\/a>.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"method-2-%e2%80%93-convert-to-the-same-case-before-comparison\"><\/span><strong>Method 2 &#8211; Convert to the Same Case Before Comparison<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Another approach is to convert both strings to the same case (either uppercase or lowercase) and then perform the comparison.<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-csharp\" data-lang=\"C#\"><code>bool res1 = strA.ToUpper() == strB.ToUpper();\nbool res2 = strA.ToLower() == strB.ToLower();<\/code><\/pre><\/div>\n\n\n\n<div style=\"height:45px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"character-section\"><\/span><strong>Character Section<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%e2%9a%a0%ef%b8%8fmethod-1-%e2%80%93-using-ascii-codes\"><\/span>\u26a0\ufe0f<strong>Method 1 &#8211; Using ASCII Codes<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-csharp\" data-lang=\"C#\"><code>bool res = Math.Abs(charA-charB) == 32 || (charA==charB);<\/code><\/pre><\/div>\n\n\n\n<p>This method leverages the ASCII code property where the difference between lowercase &#8216;a&#8217; and uppercase &#8216;A&#8217; is 32. However, it&#8217;s important to note that this approach is only suitable when comparing characters within the range of English letters.<\/p>\n\n\n\n<p>If the comparison is not constrained to English letters, <strong><mark style=\"background-color:rgba(0, 0, 0, 0);color:#cf2e2e\" class=\"has-inline-color\">unexpected results may occur<\/mark><\/strong>. <\/p>\n\n\n\n<p>For example, the decimal ASCII value of uppercase &#8216;A&#8217; is 65. Without proper constraints, characters like &#8216;!&#8217; (ASCII decimal 33) could be incorrectly deemed equivalent.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"method-2-%e2%80%93-convert-to-the-same-case-before-comparison-2\"><\/span><strong>Method 2 &#8211; Convert to the Same Case Before Comparison<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-csharp\" data-lang=\"C#\"><code>bool res1 = char.ToUpper(charA) == char.ToUpper(charB);\nbool res2 = char.ToLower(charA) == char.ToLower(charB);<\/code><\/pre><\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ins class=\"klk-aff-widget\"  data-wid=\"58514\" data-height=\"340px\"  data-adid=\"835212\" data-lang=\"\" data-prod=\"search_vertical\" data-currency=\"\"><a href=\"\/\/www.klook.com\/?aid=\">Klook.com<\/a><\/ins>\n<script type=\"text\/javascript\">\n  (function (d, sc, u) {\n    var s = d.createElement(sc),\n      p = d.getElementsByTagName(sc)[0];\n    s.type = \"text\/javascript\";\n    s.async = true;\n    s.src = u;\n    p.parentNode.insertBefore(s, p);\n  })(\n    document,\n    \"script\",\n    \"https:\/\/affiliate.klook.com\/widget\/fetch-iframe-init.js\"\n  );\n<\/script>\n\n\n\n<div style=\"height:15px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Reference<\/strong><\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/learn.microsoft.com\/en-us\/dotnet\/api\/system.string.compare?view=net-8.0\" target=\"_blank\" rel=\"noreferrer noopener\">String.Compare Method (System) | Microsoft Learn<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/printing-a-to-z-in-various-languages\/\" target=\"_blank\" rel=\"noreferrer noopener\">Printing A to Z in Various Languages &#8211; C#, Java, Python3, JS &#8211; Zyrastory<\/a><\/li>\n<\/ul>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>\ud83d\udc94 The entire article was written and tested independently. Feel free to quote or reference, but please avoid copying the entire content verbatim.<\/strong><\/p>\n\n\n\n<p>\ud83e\udde1<strong>You can support our team by sharing the post or clicking some ads, Thanks a lot<\/strong><\/p>\n\n\n\n<p>\u2705<strong>If you have<\/strong> <strong>any problem about this post, please feel free to ask~<\/strong><\/p>\n\n\n\n<p><strong>\ud83c\udf7d\ufe0fWe&#8217;re also actively seeking collaboration opportunities, whether it&#8217;s through friendly links on partner sites or advertising partnerships<\/strong><\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Some Random notes<\/strong><\/p>\n\n\n\n\t\t\t<div class=\"wp-block-uagb-post-grid uagb-post-grid  uagb-post__image-position-top uagb-post__image-enabled uagb-block-efe84f35     uagb-post__items uagb-post__columns-3 is-grid uagb-post__columns-tablet-2 uagb-post__columns-mobile-1 uagb-post__equal-height\" data-total=\"5\" style=\"\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"uagb-post__inner-wrap\">\t\t\t\t\t\t\t\t<h5 class=\"uagb-post__title uagb-post__text\">\n\t\t\t\t<a href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-java-ignoring-case\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Compare Strings or Characters for Equality in Java (Ignoring Case)<\/a>\n\t\t\t<\/h5>\n\t\t\t\t\t\t<div class='uagb-post__text uagb-post-grid-byline'>\n\t\t\t\t\t\t\t\t<time datetime=\"2024-04-18T22:39:32+08:00\" class=\"uagb-post__date\">\n\t\t\t\t<span class=\"dashicons-calendar dashicons\"><\/span>\t\t\t\t\t2024-04-18\t\t\t\t<\/time>\n\t\t\t\t\t\t\t<span class=\"uagb-post__comment\">\n\t\t\t\t<span class=\"dashicons-admin-comments dashicons\"><\/span>\t\t\t\t\t\u5c1a\u7121\u7559\u8a00\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class='uagb-post__text uagb-post__excerpt'>\n\t\t\t\t\tWhen writing code, you may occasionally need to determine if characters or strings are equal,&#8230;\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"uagb-post__text uagb-post__cta wp-block-button\">\n\t\t\t\t<a class=\"wp-block-button__link uagb-text-link\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-java-ignoring-case\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Read More<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/article>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"uagb-post__inner-wrap\">\t\t\t\t\t\t\t\t<h5 class=\"uagb-post__title uagb-post__text\">\n\t\t\t\t<a href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Compare strings or characters for equality in C# (ignoring case)<\/a>\n\t\t\t<\/h5>\n\t\t\t\t\t\t<div class='uagb-post__text uagb-post-grid-byline'>\n\t\t\t\t\t\t\t\t<time datetime=\"2024-04-13T23:25:05+08:00\" class=\"uagb-post__date\">\n\t\t\t\t<span class=\"dashicons-calendar dashicons\"><\/span>\t\t\t\t\t2024-04-13\t\t\t\t<\/time>\n\t\t\t\t\t\t\t<span class=\"uagb-post__comment\">\n\t\t\t\t<span class=\"dashicons-admin-comments dashicons\"><\/span>\t\t\t\t\t\u5c1a\u7121\u7559\u8a00\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class='uagb-post__text uagb-post__excerpt'>\n\t\t\t\t\tHow to Handle Case-Insensitive Comparisons for Characters or Strings in C#\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"uagb-post__text uagb-post__cta wp-block-button\">\n\t\t\t\t<a class=\"wp-block-button__link uagb-text-link\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/compare-strings-or-characters-for-equality-in-c-sharp-ignoring-case\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Read More<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/article>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"uagb-post__inner-wrap\">\t\t\t\t\t\t\t\t<h5 class=\"uagb-post__title uagb-post__text\">\n\t\t\t\t<a href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/exploring-various-methods-for-obtaining-subarrays-in-c-sharp\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Exploring Various Methods for Obtaining Subarrays in C#<\/a>\n\t\t\t<\/h5>\n\t\t\t\t\t\t<div class='uagb-post__text uagb-post-grid-byline'>\n\t\t\t\t\t\t\t\t<time datetime=\"2024-03-18T20:55:57+08:00\" class=\"uagb-post__date\">\n\t\t\t\t<span class=\"dashicons-calendar dashicons\"><\/span>\t\t\t\t\t2024-03-18\t\t\t\t<\/time>\n\t\t\t\t\t\t\t<span class=\"uagb-post__comment\">\n\t\t\t\t<span class=\"dashicons-admin-comments dashicons\"><\/span>\t\t\t\t\t\u5c1a\u7121\u7559\u8a00\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class='uagb-post__text uagb-post__excerpt'>\n\t\t\t\t\tThis article discusses three common methods in C# for obtaining a subarray with a specific&#8230;\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"uagb-post__text uagb-post__cta 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dashicons\"><\/span>\t\t\t\t\t2024-03-13\t\t\t\t<\/time>\n\t\t\t\t\t\t\t<span class=\"uagb-post__comment\">\n\t\t\t\t<span class=\"dashicons-admin-comments dashicons\"><\/span>\t\t\t\t\t\u5c1a\u7121\u7559\u8a00\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class='uagb-post__text uagb-post__excerpt'>\n\t\t\t\t\tExplains how to register specific words within the Polylang plugin and how to use it.\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"uagb-post__text uagb-post__cta wp-block-button\">\n\t\t\t\t<a class=\"wp-block-button__link uagb-text-link\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/coding-note\/wordpress-polylang-language-plugin-registering-specific-words\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Read More<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/article>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"uagb-post__inner-wrap\">\t\t\t\t\t\t\t\t<h5 class=\"uagb-post__title uagb-post__text\">\n\t\t\t\t<a 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