{"id":19992,"date":"2022-11-08T09:52:04","date_gmt":"2022-11-08T04:22:04","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-build-the-string-dynamically-based-on-the-length-in-c\/"},"modified":"2022-11-08T09:52:04","modified_gmt":"2022-11-08T04:22:04","slug":"solved-build-the-string-dynamically-based-on-the-length-in-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-build-the-string-dynamically-based-on-the-length-in-c\/","title":{"rendered":"[Solved] Build the string dynamically based on the length in c#"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-48805101\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"48805101\" data-parentid=\"48804873\" data-score=\"4\" 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>Firstly define an extension method for StringBuilder:<\/p>\n<pre><code>public static class StringBuilderExtensions\n{\n    public static void AppendPadded(this StringBuilder builder, string value, int length);\n    {\n        builder.Append($\"{value}{new string(' ', length)}\".Substring(0, length));\n    }\n    public static void AppendPadded(this StringBuilder builder, int value, int length);\n    {\n        builder.Append($\"{new string('0', length)}{value}\".Reverse().ToString().Substring(0, length).Reverse().ToString());\n    }\n}\n<\/code><\/pre>\n<p>Then use:<\/p>\n<pre><code>StringBuilder builder = new StringBuilder();\nbuilder.AppendPadded(\"Hiwor\", 8);\nbuilder.AppendPadded(\"meena\", 10);\nreturn builder.ToString();\n<\/code><\/pre>\n<p>Or with your example:<\/p>\n<pre><code>foreach (string item in list)\n    builder.AppendPadded(item, transLine[item]);\n<\/code><\/pre>\n<p>EDIT: Ok, so looks like you want to be able to define a format then build the string using it. Try:<\/p>\n<p>(you will need to reference System.ComponentModel.DataAnnotations and System.Reflection for this)<\/p>\n<pre><code>public abstract class AnItem\n{\n    private static int GetLength(PropertyInfo property)\n    {\n        StringLengthAttribute attribute = property.GetCustomAttributes(typeof(StringLengthAttribute), true).FirstOrDefault() as StringLengthAttribute;\n        if (attribute == null)\n            throw new Exception($\"StringLength not specified for {property.Name}\");\n        return attribute.MaxLength();\n    }\n    private string GetPropertyValue(PropertyInfo property)\n    {\n        if (property.PropertyType == typeof(string))\n            return property.GetValue(this);\n        else if (property.PropertyType == typeof(int))\n            return property.GetValue(this).ToString();\n        else\n            throw new Exception($\"Property '{property.Name}' is not a supported type\");\n    }\n    private static void SetPropertyValue(object item, PropertyInfo property, string value)\n    {\n        if (property.PropertyType == typeof(string))\n            property.SetValue(item, value, null);\n        else if (property.PropertyType == typeof(int))\n            property.SetValue(item, int.Parse(value), null);\n        else\n            throw new Exception($\"Property '{property.Name}' is not a supported type\");\n    }\n    public string GetPaddedString()\n    {\n        StringBuilder builder = new StringBuilder();\n        PropertyInfo[] properties = GetType().GetProperties();\n        foreach (PropertyInfo property in properties)\n            builder.AppendPadded(GetPropertyValue(property), GetLength(property));\n        return builder.ToString();\n    }\n    public static T CreateFromPaddedString&lt;T&gt;(string paddedString) where T : AnItem, new()\n    {\n        T item = new T();\n        int offset = 0;\n        PropertyInfo[] properties = typeof(T).GetProperties();\n        foreach (PropertyInfo property in properties)\n        {\n            int length = GetLength(property);\n            if (offset + length &gt; paddedString.Length)\n                throw new Exception(\"The string is too short\");\n            SetPropertyValue(item, property, paddedString.Substring(offset, length)));\n            offset += length;\n        }\n        if (offset &lt; paddedString.Length)\n            throw new Exception(\"The string is too long\");\n        return item;\n    }\n}\npublic class MyItem : AnItem\n{\n    [StringLength(1)]\n    public string ProductCode { get; set; }\n\n    [StringLength(12)]\n    public string ApplicantFirstName { get; set; }\n\n    [StringLength(1)]\n    public string ApplicantMiddleInitial { get; set; }\n\n    [StringLength(1)]\n    public string Partner { get; set; }\n\n    [StringLength(8)]\n    public string Employee { get; set; }\n}\n<\/code><\/pre>\n<p>Then use it:<\/p>\n<pre><code>MyItem item = new MyItem\n{\n    ProductCode = \"grouplife\",\n    ApplicantFirstName = \"meena\",\n    ApplicantMiddleInitial = \"d\",\n    Partner = \"yes\",\n    Employee = \"yes\"\n};\n\nstring paddedString = item.GetPaddedString();\n<\/code><\/pre>\n<p>And to read a string to get an item:<\/p>\n<pre><code>MyItem item = AnItem.CreateFromPaddedString&lt;MyItem&gt;(paddedString);\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">9<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Build the string dynamically based on the length in c# <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Firstly define an extension method for StringBuilder: public static class StringBuilderExtensions { public static void AppendPadded(this StringBuilder builder, string value, int length); { builder.Append($&#8221;{value}{new string(&#8216; &#8216;, length)}&#8221;.Substring(0, length)); } public static void AppendPadded(this StringBuilder builder, int value, int length); { builder.Append($&#8221;{new string(&#8216;0&#8217;, length)}{value}&#8221;.Reverse().ToString().Substring(0, length).Reverse().ToString()); } } Then use: StringBuilder builder = new StringBuilder(); builder.AppendPadded(&#8220;Hiwor&#8221;, &#8230; <a title=\"[Solved] Build the string dynamically based on the length in c#\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-build-the-string-dynamically-based-on-the-length-in-c\/\" aria-label=\"More on [Solved] Build the string dynamically based on the length in c#\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,1428],"class_list":["post-19992","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-stringbuilder"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Build the string dynamically based on the length in c# - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-build-the-string-dynamically-based-on-the-length-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Build the string dynamically based on the length in c# - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Firstly define an extension method for StringBuilder: public static class StringBuilderExtensions { public static void AppendPadded(this StringBuilder builder, string value, int length); { builder.Append($&quot;{value}{new string(&#039; &#039;, length)}&quot;.Substring(0, length)); } public static void AppendPadded(this StringBuilder builder, int value, int length); { builder.Append($&quot;{new string(&#039;0&#039;, length)}{value}&quot;.Reverse().ToString().Substring(0, length).Reverse().ToString()); } } Then use: StringBuilder builder = new StringBuilder(); builder.AppendPadded(&quot;Hiwor&quot;, ... 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