{"id":24811,"date":"2022-12-05T23:22:14","date_gmt":"2022-12-05T17:52:14","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-concatenate-the-properties-of-a-list-and-write-to-file-in-c\/"},"modified":"2022-12-05T23:22:14","modified_gmt":"2022-12-05T17:52:14","slug":"solved-concatenate-the-properties-of-a-list-and-write-to-file-in-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-concatenate-the-properties-of-a-list-and-write-to-file-in-c\/","title":{"rendered":"[Solved] Concatenate the properties of a List and write to file in C#"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-59153732\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"59153732\" data-parentid=\"59153141\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>OK. Let&#8217;s <em>generalize<\/em> the problem (see comments for the question): let us join <em>all the properties<\/em> which are:<\/p>\n<ol>\n<li><code>public<\/code> and <em>not<\/em> <code>static<\/code>.<\/li>\n<li><em>Readable<\/em> and <em>Writable<\/em>.<\/li>\n<li>Not indexers (what should we do with <code>this[int, int]<\/code> property?).<\/li>\n<li>Of specified types (e.g. <code>string<\/code>, <code>int<\/code>, <code>decimal<\/code>, <code>double<\/code>) only (how can we save, a property of, say, <code>IComparer&lt;int&gt;<\/code> type?).<\/li>\n<\/ol>\n<p>We can obtain such properties with a help of <em>Reflection<\/em> and <em>Linq<\/em>:<\/p>\n<pre><code>  using System.Linq;\n  using System.Reflection;\n\n  ...\n\n  HashSet&lt;Type&gt; allowedTypes = new HashSet&lt;Type&gt;() {\n    typeof(string), typeof(int), typeof(decimal), typeof(double)\n  };\n\n  var properties = typeof(Car)\n    .GetProperties(BindingFlags.Instance | BindingFlags.Public)\n    .Where(prop =&gt; prop.CanRead &amp;&amp; prop.CanWrite)\n    .Where(prop =&gt; !prop.GetIndexParameters().Any())\n    .Where(prop =&gt; allowedTypes.Contains(prop.PropertyType))\n \/\/ .Where(prop =&gt; ...) \/\/ Add here more coditions if required\n    .ToArray();\n<\/code><\/pre>\n<p>Now, having these <code>properties<\/code> we can save values into a file:<\/p>\n<pre><code>  using System.IO;\n  using System.Linq;\n\n  ...\n\n  File.WriteAllLines(@\"D:\\WriteLines.txt\", cars\n    .Select(car =&gt; string.Join(\",\", properties\n       .Select(property =&gt; property.GetValue(car)))));\n<\/code><\/pre>\n<p>Finally, you can combine these parts into a <em>single routine<\/em>: <\/p>\n<pre><code>  private static void SaveToFile&lt;T&gt;(IEnumerable&lt;T&gt; source, string fileName) {\n    HashSet&lt;Type&gt; allowedTypes = new HashSet&lt;Type&gt;() {\n      typeof(string), typeof(int), typeof(decimal), typeof(double)\n    };\n\n    var properties = typeof(T)\n      .GetProperties(BindingFlags.Instance | BindingFlags.Public)\n      .Where(prop =&gt; prop.CanRead &amp;&amp; prop.CanWrite)\n      .Where(prop =&gt; !prop.GetIndexParameters().Any())\n      .Where(prop =&gt; allowedTypes.Contains(prop.PropertyType))\n   \/\/ .Where(prop =&gt; ...) \/\/ Add here more coditions if required\n      .ToArray();\n\n    File.WriteAllLines(fileName, source\n      .Select(item =&gt; string.Join(\",\", properties\n        .Select(property =&gt; property.GetValue(item))))); \n  } \n<\/code><\/pre>\n<p>Then use it:<\/p>\n<pre><code>  List&lt;Car&gt; cars = new List&lt;Car&gt;();\n\n  ... \n\n  SaveToFile(Cars, @\"D:\\WriteLines.txt\");\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Concatenate the properties of a List<Class> and write to file in C# <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] OK. Let&#8217;s generalize the problem (see comments for the question): let us join all the properties which are: public and not static. Readable and Writable. Not indexers (what should we do with this[int, int] property?). Of specified types (e.g. string, int, decimal, double) only (how can we save, a property of, say, IComparer&lt;int&gt; type?). &#8230; <a title=\"[Solved] Concatenate the properties of a List and write to file in C#\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-concatenate-the-properties-of-a-list-and-write-to-file-in-c\/\" aria-label=\"More on [Solved] Concatenate the properties of a List and write to file in C#\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,1092],"class_list":["post-24811","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-concatenation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Concatenate the properties of a List and write to file in C# - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-concatenate-the-properties-of-a-list-and-write-to-file-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Concatenate the properties of a List and write to file in C# - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] OK. Let&#8217;s generalize the problem (see comments for the question): let us join all the properties which are: public and not static. Readable and Writable. Not indexers (what should we do with this[int, int] property?). Of specified types (e.g. string, int, decimal, double) only (how can we save, a property of, say, IComparer&lt;int&gt; type?). ... 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