{"id":2591,"date":"2023-07-08T08:26:12","date_gmt":"2023-07-08T01:26:12","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=2591"},"modified":"2023-07-08T08:57:01","modified_gmt":"2023-07-08T01:57:01","slug":"csharp-string-join","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-string-methods\/csharp-string-join\/","title":{"rendered":"C# String Join"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the C# string <code>Join()<\/code> method to concatenate a collection of elements using a specified separator.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the C# String Join() method<\/h2>\n\n\n\n<p>The C# <a href=\"https:\/\/csharptutorial.net\/csharp-string-methods\/csharp-string-join\/\">string<\/a> <code>Join()<\/code> method allows you to concatenate a collection of elements into a single string using a specified separator.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the String <code>Join()<\/code> method:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">string<\/span> Join&lt;T&gt; (\n    <span class=\"hljs-keyword\">string<\/span>? separator, \n    IEnumerable&lt;T&gt; values\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>T<\/code> is the type of the members of values.<\/li>\n\n\n\n<li><code>separator<\/code> is a string used as a separator between elements in the <code>values<\/code> collection.<\/li>\n\n\n\n<li><code>values<\/code> is a collection of elements to concatenate. It can be any collection that implements the <a href=\"https:\/\/csharptutorial.net\/csharp-linq\/csharp-ienumerable\/\">IEnumerable&lt;T&gt;<\/a> interface.<\/li>\n<\/ul>\n\n\n\n<p>The <code>Join()<\/code> method returns a single string that consists of elements of values separated by the <code>separator<\/code> string.<\/p>\n\n\n\n<p>If the values collection has no elements, the <code>Join()<\/code> method returns an empty string i.e. <code>String.Empty<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C# String Join() method examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>Join()<\/code> method.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Using the string Join() method to concatenate an array of strings<\/h3>\n\n\n\n<p>The following example illustrates how to use the <code>Join()<\/code> method to concatenate strings of an array using a comma as a separator:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">using<\/span> <span class=\"hljs-keyword\">static<\/span> System.Console;\n\n<span class=\"hljs-keyword\">string<\/span>&#91;] fruits = { \n    <span class=\"hljs-string\">\"apple\"<\/span>, \n    <span class=\"hljs-string\">\"banana\"<\/span>, \n    <span class=\"hljs-string\">\"orange\"<\/span>, \n    <span class=\"hljs-string\">\"mango\"<\/span>, \n};\n\n<span class=\"hljs-keyword\">var<\/span> result = <span class=\"hljs-keyword\">string<\/span>.Join(<span class=\"hljs-string\">\",\"<\/span>, fruits);\n\nWriteLine(result);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\">apple,banana,orange,mango<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">2) Using the string Join() method with a space as a separator<\/h3>\n\n\n\n<p>The following example illustrates how to use the <code>Join()<\/code> method to concatenate a list of strings using a space as the separator:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">using<\/span> <span class=\"hljs-keyword\">static<\/span> System.Console;\n\n<span class=\"hljs-keyword\">var<\/span> names = <span class=\"hljs-keyword\">new<\/span> List&lt;<span class=\"hljs-keyword\">string<\/span>&gt; { <span class=\"hljs-string\">\"John\"<\/span>, <span class=\"hljs-string\">\"Jane\"<\/span>, <span class=\"hljs-string\">\"Bob\"<\/span>, <span class=\"hljs-string\">\"Alice\"<\/span> };\n<span class=\"hljs-keyword\">var<\/span> result = <span class=\"hljs-keyword\">string<\/span>.Join(<span class=\"hljs-string\">\" \"<\/span>, names);\n\nWriteLine(result);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\">John Jane Bob Alice<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">3) Using the string Join() method to concatenate an array of characters<\/h3>\n\n\n\n<p>The following example shows how to use the <code>Join()<\/code> method to concatenate an array of characters into a single string:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">using<\/span> <span class=\"hljs-keyword\">static<\/span> System.Console;\n\n<span class=\"hljs-keyword\">char<\/span>&#91;] characters = { <span class=\"hljs-string\">'H'<\/span>, <span class=\"hljs-string\">'e'<\/span>, <span class=\"hljs-string\">'l'<\/span>, <span class=\"hljs-string\">'l'<\/span>, <span class=\"hljs-string\">'o'<\/span> };\n<span class=\"hljs-keyword\">var<\/span> result = <span class=\"hljs-keyword\">string<\/span>.Join(<span class=\"hljs-string\">\"\"<\/span>, characters);\n\nWriteLine(result);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\">Hello<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">4) Using the string join() method to concatenate an array of objects<\/h3>\n\n\n\n<p>If you pass an array of objects to the <code>Join()<\/code> method, it&#8217;ll use the string representation of the object to concatenate. For example:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">using<\/span> <span class=\"hljs-keyword\">static<\/span> System.Console;\n\n<span class=\"hljs-keyword\">var<\/span> members = <span class=\"hljs-keyword\">new<\/span> List&lt;Person&gt;() {\n    <span class=\"hljs-keyword\">new<\/span> Person(<span class=\"hljs-string\">\"John\"<\/span>, <span class=\"hljs-string\">\"Doe\"<\/span>),\n    <span class=\"hljs-keyword\">new<\/span> Person(<span class=\"hljs-string\">\"Jane\"<\/span>, <span class=\"hljs-string\">\"Doe\"<\/span>)\n};\n\n<span class=\"hljs-keyword\">var<\/span> result = <span class=\"hljs-keyword\">string<\/span>.Join(<span class=\"hljs-string\">\",\"<\/span>, members);\nWriteLine(result);\n\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Person<\/span>\n{\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">string<\/span> FirstName { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>;}\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">string<\/span> LastName { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>;}\n\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title\">Person<\/span>(<span class=\"hljs-params\"><span class=\"hljs-keyword\">string<\/span> firstName, <span class=\"hljs-keyword\">string<\/span> lastName<\/span>)<\/span>\n    {\n        FirstName = firstName;\n        LastName = lastName;\n    }\n\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-keyword\">string<\/span> <span class=\"hljs-title\">ToString<\/span>(<span class=\"hljs-params\"><\/span>)<\/span> =&gt; <span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{FirstName}<\/span> <span class=\"hljs-subst\">{LastName}<\/span>\"<\/span>;\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\">John Doe,Jane Doe<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Selecting elements to concatenate<\/h2>\n\n\n\n<p>The following overload of the <code>Join()<\/code> method to concatenate elements of a collection selectively:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">string<\/span> <span class=\"hljs-title\">Join<\/span> (<span class=\"hljs-params\">\n    <span class=\"hljs-keyword\">string<\/span>? separator, \n    <span class=\"hljs-keyword\">string<\/span>?&#91;] <span class=\"hljs-keyword\">value<\/span>, \n    <span class=\"hljs-keyword\">int<\/span> startIndex, \n    <span class=\"hljs-keyword\">int<\/span> count\n<\/span>)<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>startIndex<\/code> is the first element in the values collection to concatenate.<\/li>\n\n\n\n<li><code>count<\/code> specifies the number of elements from the <code>value<\/code> array to concatenate, starting with the element in the <code>startIndex<\/code>.<\/li>\n<\/ul>\n\n\n\n<p>The <code>Join()<\/code> method returns a single string that consists of <code>count<\/code> elements of the value array starting at <code>startIndex<\/code> separated by the <code>separator<\/code>.<\/p>\n\n\n\n<p>The following example illustrates how to use the <code>Join()<\/code> method to concatenate two elements starting from the second element in the <code>colors<\/code> array:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">using<\/span> <span class=\"hljs-keyword\">static<\/span> System.Console;\n\n\n<span class=\"hljs-keyword\">var<\/span> colors = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-keyword\">string<\/span>&#91;] { <span class=\"hljs-string\">\"red\"<\/span>, <span class=\"hljs-string\">\"green\"<\/span>, <span class=\"hljs-string\">\"blue\"<\/span>, <span class=\"hljs-string\">\"yellow\"<\/span> };\n\n<span class=\"hljs-keyword\">var<\/span> result = <span class=\"hljs-keyword\">string<\/span>.Join(\n    separator: <span class=\"hljs-string\">\",\"<\/span>,\n    <span class=\"hljs-keyword\">value<\/span>: colors,\n    startIndex: <span class=\"hljs-number\">1<\/span>,\n    count: <span class=\"hljs-number\">2<\/span>\n);\n\nWriteLine(result);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\">green,blue<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the C# string <code>Join()<\/code> method to concatenate the elements of a collection into a string using a specified separator.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful ?<\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"2591\"\n\t\t\t\tdata-post-url=\"https:\/\/www.csharptutorial.net\/csharp-string-methods\/csharp-string-join\/\"\n\t\t\t\tdata-post-title=\"C# String Join\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 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