{"id":225,"date":"2021-12-30T14:02:31","date_gmt":"2021-12-30T07:02:31","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=225"},"modified":"2021-12-30T15:05:33","modified_gmt":"2021-12-30T08:05:33","slug":"csharp-default-parameters","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-tutorial\/csharp-default-parameters\/","title":{"rendered":"C# Default Parameters"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn how to use the C# default parameters to simplify the function call.<\/p>\n\n\n\n

Introduction to the C# default parameters<\/h2>\n\n\n\n

When defining a function<\/a> with parameters, you can specify the default arguments like this:<\/p>\n\n\n

<modifiers> <return<\/span>-type> functionName(parameter1,parameter2=argument2,...)<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
C# requires that the parameters with default arguments appear after other parameters.<\/p>\n\n\n\n
The following example defines a function calculateTax()<\/code> that calculates the net price based on the selling price and sales tax:<\/p>\n\n\n
double<\/span> calculatePrice<\/span>(double<\/span> sellingPrice, double<\/span> salesTax=0.08<\/span><\/span>)<\/span>\n{\n    return<\/span> sellingPrice * (1<\/span> + salesTax);\n}<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this example, the salesTax<\/code> parameter has a default value of 0.08. <\/p>\n\n\n\n
When calling the function, if you don’t specify the argument for the parameter with default arguments, the function will take the default argument instead.<\/p>\n\n\n\n
For example:<\/p>\n\n\n
double<\/span> calculatePrice<\/span>(double<\/span> sellingPrice, double<\/span> salesTax=0.08<\/span><\/span>)<\/span>\n{\n    return<\/span> sellingPrice * (1<\/span> + salesTax);\n}\n\nvar<\/span> netPrice = calculatePrice(100<\/span>);\n\nConsole.WriteLine($\"The net price is {netPrice:0.<\/span>##}<\/span>\"<\/span>);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
108<\/span><\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this example, we only pass the selling price to the calculatePrice()<\/code> function. Therefore, the calculatePrice()<\/code> function will use 0.08 for the salesTax<\/code> parameter. As a result, the net price is 108<\/code>.<\/p>\n\n\n\n
If you pass the salesTax<\/code> argument, the function will use that value instead of the default argument. For example:<\/p>\n\n\n
double<\/span> calculatePrice<\/span>(double<\/span> sellingPrice, double<\/span> salesTax=0.08<\/span><\/span>)<\/span>\n{\n    return<\/span> sellingPrice * (1<\/span> + salesTax);\n}\n\nvar<\/span> netPrice = calculatePrice(100<\/span>,0.1<\/span>);\n\nConsole.WriteLine($\"The net price is {netPrice:0.<\/span>##}<\/span>\"<\/span>);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
110<\/span><\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this example, we pass the salesTax as 0.1<\/code> to the calculatePrice()<\/code> function. Hence, the function uses 0.1<\/code> instead of 0.08<\/code> for the salesTax<\/code> parameter.<\/p>\n\n\n\n
Summary<\/h2>\n\n\n\n
  • Use function default parameters to simplify the function call<\/li>
  • Place the parameters with default values after other parameters.<\/li><\/ul>\n
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