{"id":1449,"date":"2023-04-10T07:53:35","date_gmt":"2023-04-10T00:53:35","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=1449"},"modified":"2024-12-14T22:20:18","modified_gmt":"2024-12-14T15:20:18","slug":"csharp-single-responsibility-principle","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-design-patterns\/csharp-single-responsibility-principle\/","title":{"rendered":"C# Single Responsibility Principle"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the C# Single Responsibility Principle to develop more maintainable and scalable software applications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the C# single responsibility principle<\/h2>\n\n\n\n<p>The Single Responsibility Principle (SRP) is the first principle in the five SOLID principles:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Single Responsibility Principle (SRP)<\/strong><\/li>\n\n\n\n<li><a href=\"https:\/\/csharptutorial.net\/csharp-design-patterns\/csharp-open-closed-principle\/\">Open-Closed Principle (OCP)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/csharptutorial.net\/csharp-design-patterns\/csharp-liskov-substitution-principle\/\">Liskov Substitution Principle (LSP)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/csharptutorial.net\/csharp-design-patterns\/csharp-interface-segregation-principle\/\">Interface Segregation Principle (ISP)&nbsp;<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/csharptutorial.net\/csharp-design-patterns\/csharp-dependency-inversion-principle\/\">Dependency Inversion Principle (DIP)<\/a><\/li>\n<\/ul>\n\n\n\n<p>The Single Responsibility Principle states that a software module should have <strong>a single responsibility<\/strong>, i.e., it should have <strong>one and only one reason to change<\/strong>.<\/p>\n\n\n\n<p>Having a single responsibility makes a class more cohesive and easier to maintain. It also makes the application more flexible, as changes to one responsibility do not impact other responsibilities.<\/p>\n\n\n\n<p>For example, a class responsible for representing data should only be responsible for holding the data. It should not be responsible for saving the data to a database or performing unrelated tasks.<\/p>\n\n\n\n<p>Separating these responsibilities into separate classes makes the application more maintainable and straightforward.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C# Single Responsibility Principle example<\/h2>\n\n\n\n<p>Suppose you need to create a program to manage invoices:<\/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\">class<\/span> <span class=\"hljs-title\">Invoice<\/span>\n{\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">int<\/span> InvoiceNo {  <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\n    <span class=\"hljs-keyword\">public<\/span> DateOnly IssuedDate { <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>? Customer { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">decimal<\/span> Amount { <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>? Description { <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-keyword\">void<\/span> <span class=\"hljs-title\">Save<\/span>(<span class=\"hljs-params\"><\/span>)<\/span>\n    {\n        Console.WriteLine(<span class=\"hljs-string\">$\"Saved the invoice #<span class=\"hljs-subst\">{InvoiceNo}<\/span>\"<\/span>);\n    }\n\n}\n\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Program<\/span>\n{\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Main<\/span>(<span class=\"hljs-params\"><span class=\"hljs-keyword\">string<\/span>&#91;] args<\/span>)<\/span>\n    {\n        <span class=\"hljs-comment\">\/\/ create a new invoice<\/span>\n        <span class=\"hljs-keyword\">var<\/span> invoice = <span class=\"hljs-keyword\">new<\/span> Invoice\n        {\n            InvoiceNo = <span class=\"hljs-number\">1<\/span>,\n            Customer = <span class=\"hljs-string\">\"John Doe\"<\/span>,\n            IssuedDate = <span class=\"hljs-keyword\">new<\/span> DateOnly(<span class=\"hljs-number\">2023<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">1<\/span>),\n            Description = <span class=\"hljs-string\">\"Website Design\"<\/span>,\n            Amount = <span class=\"hljs-number\">1000<\/span>\n        };\n\n        invoice.Save();\n\n    }\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>How it works.<\/p>\n\n\n\n<p>First, define an <code>Invoice<\/code> class that has properties <code>InvoiceNo<\/code>, <code>Customer<\/code>, <code>IssuedDate<\/code>, <code>Description<\/code>, and <code>Amount<\/code>. The <code>Invoice<\/code> class also has the <code>Save()<\/code> method that saves an invoice into a database:<\/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\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Invoice<\/span>\n{\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">int<\/span> InvoiceNo {  <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\n    <span class=\"hljs-keyword\">public<\/span> DateOnly IssuedDate { <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>? Customer { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">decimal<\/span> Amount { <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>? Description { <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-keyword\">void<\/span> <span class=\"hljs-title\">Save<\/span>(<span class=\"hljs-params\"><\/span>)<\/span>\n    {\n        Console.WriteLine(<span class=\"hljs-string\">$\"Saved the invoice #<span class=\"hljs-subst\">{InvoiceNo}<\/span>\"<\/span>);\n    }\n\n}<\/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 class=\"note\">The <code>Save()<\/code> method displays a message in the console instead of saving an invoice to a real database for demonstration purposes.<\/p>\n\n\n\n<p>Second, create an invoice in the <code>Main()<\/code> method of the <code>Program<\/code> class and call the <code>Save()<\/code> method to save the invoice:<\/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\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Program<\/span>\n{\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Main<\/span>(<span class=\"hljs-params\"><span class=\"hljs-keyword\">string<\/span>&#91;] args<\/span>)<\/span>\n    {\n        <span class=\"hljs-comment\">\/\/ create a new invoice<\/span>\n        <span class=\"hljs-keyword\">var<\/span> invoice = <span class=\"hljs-keyword\">new<\/span> Invoice\n        {\n            InvoiceNo = <span class=\"hljs-number\">1<\/span>,\n            Customer = <span class=\"hljs-string\">\"John Doe\"<\/span>,\n            IssuedDate = <span class=\"hljs-keyword\">new<\/span> DateOnly(<span class=\"hljs-number\">2023<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">1<\/span>),\n            Description = <span class=\"hljs-string\">\"Website Design\"<\/span>,\n            Amount = <span class=\"hljs-number\">1000<\/span>\n        };\n\n        invoice.Save();\n\n    }\n}<\/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<p>Initially, the <code>Invoice<\/code> class looks fine. But when the program grows, you&#8217;ll realize that the <code>Invoice<\/code> class has multiple responsibilities.<\/p>\n\n\n\n<p>The <code>Invoice<\/code> class represents the invoice data and is responsible for saving the invoice into storage. This violates the single responsibility principle, as the <code>Invoice<\/code> class should have a single responsibility.<\/p>\n\n\n\n<p>Let&#8217;s refactor the Invoice class to follow the single responsibility principle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Refactoring the Invoice class to follow the single responsibility principle<\/h2>\n\n\n\n<p>First, create a separate class called <code>InvoiceRepository<\/code> for saving an invoice and moving the <code>Save()<\/code> method from the <code>Invoice<\/code> class to the <code>InvoiceRepository<\/code> class:<\/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\">class<\/span> <span class=\"hljs-title\">InvoiceRepository<\/span>\n{\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Save<\/span>(<span class=\"hljs-params\">Invoice invoice<\/span>)<\/span>\n    {\n        Console.WriteLine(<span class=\"hljs-string\">$\"Saved the invoice #<span class=\"hljs-subst\">{invoice.InvoiceNo}<\/span>\"<\/span>);\n    }\n}<\/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>The <code>Invoice<\/code> class now has a single responsibility representing invoice data only. The <code>InvoiceRepository<\/code> is solely responsible for saving the invoice.<\/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\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Invoice<\/span>\n{\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">int<\/span> InvoiceNo { <span class=\"hljs-keyword\">get<\/span>;<span class=\"hljs-keyword\">set<\/span>; }\n    <span class=\"hljs-keyword\">public<\/span> DateOnly IssuedDate { <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>? Customer { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>;}\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">decimal<\/span> Amount { <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>? Description { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>;}\n}<\/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<p>Second, create an invoice and save it to a database by calling the <code>Save()<\/code> of the <code>InvoiceRepository<\/code> class:<\/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\">class<\/span> <span class=\"hljs-title\">Program<\/span>\n{\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Main<\/span>(<span class=\"hljs-params\"><span class=\"hljs-keyword\">string<\/span>&#91;] args<\/span>)<\/span>\n    {\n        <span class=\"hljs-comment\">\/\/ create a new invoice<\/span>\n        <span class=\"hljs-keyword\">var<\/span> invoice = <span class=\"hljs-keyword\">new<\/span> Invoice\n        {\n            InvoiceNo = <span class=\"hljs-number\">1<\/span>,\n            Customer = <span class=\"hljs-string\">\"John Doe\"<\/span>,\n            IssuedDate = <span class=\"hljs-keyword\">new<\/span> DateOnly(<span class=\"hljs-number\">2023<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">1<\/span>),\n            Description = <span class=\"hljs-string\">\"Website Design\"<\/span>,\n            Amount = <span class=\"hljs-number\">1000<\/span>\n        };\n\n        <span class=\"hljs-comment\">\/\/ save the invoice to a storage<\/span>\n        <span class=\"hljs-keyword\">var<\/span> invoiceRepository = <span class=\"hljs-keyword\">new<\/span> InvoiceRepository();\n        invoiceRepository.Save(invoice);\n    }\n}<\/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>Put it all together.<\/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\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Invoice<\/span>\n{\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">int<\/span> InvoiceNo { <span class=\"hljs-keyword\">get<\/span>;<span class=\"hljs-keyword\">set<\/span>; }\n    <span class=\"hljs-keyword\">public<\/span> DateOnly IssuedDate { <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>? Customer { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>;}\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">decimal<\/span> Amount { <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>? Description { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>;}\n}\n\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">InvoiceRepository<\/span>\n{\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Save<\/span>(<span class=\"hljs-params\">Invoice invoice<\/span>)<\/span>\n    {\n        Console.WriteLine(<span class=\"hljs-string\">$\"Saved the invoice #<span class=\"hljs-subst\">{invoice.InvoiceNo}<\/span>\"<\/span>);\n    }\n}\n\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Program<\/span>\n{\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Main<\/span>(<span class=\"hljs-params\"><span class=\"hljs-keyword\">string<\/span>&#91;] args<\/span>)<\/span>\n    {\n        <span class=\"hljs-comment\">\/\/ create a new invoice<\/span>\n        <span class=\"hljs-keyword\">var<\/span> invoice = <span class=\"hljs-keyword\">new<\/span> Invoice\n        {\n            InvoiceNo = <span class=\"hljs-number\">1<\/span>,\n            Customer = <span class=\"hljs-string\">\"John Doe\"<\/span>,\n            IssuedDate = <span class=\"hljs-keyword\">new<\/span> DateOnly(<span class=\"hljs-number\">2023<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">1<\/span>),\n            Description = <span class=\"hljs-string\">\"Website Design\"<\/span>,\n            Amount = <span class=\"hljs-number\">1000<\/span>\n        };\n\n        <span class=\"hljs-comment\">\/\/ save the invoice to a storage<\/span>\n        <span class=\"hljs-keyword\">var<\/span> invoiceRepository = <span class=\"hljs-keyword\">new<\/span> InvoiceRepository();\n        invoiceRepository.Save(invoice);\n    }\n}<\/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<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The Single Responsibility Principle states that a module should have only one reason to change.<\/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=\"1449\"\n\t\t\t\tdata-post-url=\"https:\/\/www.csharptutorial.net\/csharp-design-patterns\/csharp-single-responsibility-principle\/\"\n\t\t\t\tdata-post-title=\"C# Single Responsibility Principle\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded 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