{"id":67034,"date":"2022-03-20T08:00:54","date_gmt":"2022-03-20T07:00:54","guid":{"rendered":"https:\/\/drafts.code-maze.com\/?p=67034"},"modified":"2022-03-20T09:10:40","modified_gmt":"2022-03-20T08:10:40","slug":"csharp-using-variables-inside-strings","status":"publish","type":"post","link":"https:\/\/code-maze.com\/csharp-using-variables-inside-strings\/","title":{"rendered":"Using Variables Inside Strings in C#"},"content":{"rendered":"

In this article, we are going to explore how to use variables inside strings in C#. There are a few ways to accomplish that, depending on the C# version being used.<\/p>\n

To download the source code for this article, you can visit our GitHub repository<\/a>.<\/div>\n

So, let’s start<\/p>\n

<\/a>Concatenating Variables in C#<\/h2>\n

The common way of inserting variables into strings is to use the +<\/code> operator:<\/p>\n

var myNumber = 5;\r\nvar myText = \"My number is \" + myNumber + \" but I can count way more\";<\/pre>\n
The +<\/code> operator allows us to concatenate strings, that is, to join strings together.<\/p>\n
For primitive data types<\/a>, this works pretty well. But in case we use classes or structs, we want to override their ToString()<\/code> method:<\/p>\n
public class MyClass\r\n{\r\n    public var MyNumber { get; set; }\r\n\r\n    public MyClass(int num)\r\n    {\r\n        MyNumber = num;\r\n    }\r\n\r\n    public override string ToString()\r\n    {\r\n        return MyNumber.ToString();\r\n    }\r\n}<\/pre>\n
Now, we can use this class to get the output we want:<\/p>\n
var number = new MyClass(3); \r\nvar numberText1 = \"My number is \" + number; \r\nvar numberText2 = \"My number is \" + number.ToString();<\/pre>\n
It’s not necessary to call\u00a0ToString()<\/code> directly as it’s being done internally.<\/p>\n
<\/a>Using string.Format()<\/h2>\n
Another way to include variables in a string is to use the\u00a0string.Format()<\/code> method:<\/p>\n
var apples = 10;\r\nvar bananas = 6;\r\nstring.Format(\"I have {0} apples, {1} bananas and {2} pears\", apples, bananas, 3);<\/pre>\n
We replace the {x}<\/code> placeholders with the other arguments in the function in the order they come in, with {0}<\/code> being the first argument,\u00a0{1}<\/code> the second argument, and so on.<\/p>\n
Moreover, this allows to re-use the same arguments or to mix them in different positions:<\/p>\n
var apples = 10;\r\nvar pears = 6;\r\nstring.Format(\"I have {0} apples, {2} bananas and {1} pears. Did I mention I have {2} bananas?\", apples, pears, 3);<\/pre>\n
<\/a>Using String Interpolation<\/h2>\n
Starting with version 6, C# allows string interpolation, which conveys a more “natural” flow to the syntax:<\/p>\n
var myApples = 2;\r\nvar myPears = 5;\r\nvar myBananas = 10;\r\nstring myString = $\"I have {myApples} apples, {myPears} pears and {(myApples > 2 ? myBananas : myBananas + 5)} bananas\";<\/pre>\n
Prefixing a string literal with\u00a0$<\/code> allows us to interpret any content inside a pair of curly brackets as language expressions. They get evaluated and the result is converted to a string automatically.<\/p>\n
If we want to use curly brackets in our text, we need to escape them with another matching bracket:<\/p>\n
var word = \"too\";\r\n$\"{{I am just a regular string}}! This other string is {word}.\";<\/pre>\n
<\/a>Conclusion<\/h2>\n
In this article, we have covered three ways to mix variables inside strings in C#<\/a>. String interpolation is the most recent method and likely the easiest one to write and understand.<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"
In this article, we are going to explore how to use variables inside strings in C#. There are a few ways to accomplish that, depending on the C# version being used. So, let’s start Concatenating Variables in C# The common way of inserting variables into strings is to use the + operator: var myNumber = […]<\/p>\n","protected":false},"author":6,"featured_media":62189,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[12],"tags":[242,702,1122],"class_list":["post-67034","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-csharp","tag-string","tag-string-concat","tag-using-variables-inside-strings","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"\nUsing Variables Inside Strings in C# - Code Maze<\/title>\n<meta name=\"description\" content=\"We'll learn how to use variables inside strings in C#: string concatenation, string.Format() and C# 6.0 string interpolation\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/code-maze.com\/csharp-using-variables-inside-strings\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using Variables Inside Strings in C# - 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