You can use the out keyword in two contexts:
As a parameter modifier, which lets you pass an argument to a method by reference rather than by value.
In generic type parameter declarations for interfaces and delegates, which specifies that a type parameter is covariant.
The out keyword is especially useful when a method needs to return more than one value since more than one out parameter can be used e.g.
public void Main()
{
double radiusValue = 3.92781;
//Calculate the circumference and area of a circle, returning the results to Main().
CalculateCircumferenceAndArea(radiusValue, out double circumferenceResult, out var areaResult);
System.Console.WriteLine($"Circumference of a circle with a radius of {radiusValue} is {circumferenceResult}.");
System.Console.WriteLine($"Area of a circle with a radius of {radiusValue} is {areaResult}.");
Console.ReadLine();
}
//The calculation worker method.
public static void CalculateCircumferenceAndArea(double radius, out double circumference, out double area)
{
circumference = 2 * Math.PI * radius;
area = Math.PI * (radius * radius);
}
The following limitations apply to using the out keyword:
out parameters are not allowed in asynchronous methods.out parameters are not allowed in iterator methods.out parameters.Collaborate with us on GitHub
The source for this content can be found on GitHub, where you can also create and review issues and pull requests. For more information, see our contributor guide. Additional resources Additional resources In this articleRetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.3