docs/csharp/language-reference/operators/snippets/shared/ConditionalOperator.cs - main - aprogrammer/dotnet-docs

docs/csharp/language-reference/operators/snippets/shared/ConditionalOperator.cs

85 строк2 KB

YUVRAJ N JADHAV

Update ConditionalOperator.cs (#40547)

18 апр 2024, 16:31

18 апр 2024, 16:31c0ce326

namespace operators;

public class ConditionalOperator
{
    public static void Examples()
    {
        BasicExample();
        ConditionalRefExpressions();
        ComparisonWithIf();
        TargetTyped();
        NotTargetTyped();
    }

    private static void BasicExample()
    {
        // <BasicExample>
        string GetWeatherDisplay(double tempInCelsius) => tempInCelsius < 20.0 ? "Cold." : "Perfect!";
        
        Console.WriteLine(GetWeatherDisplay(15));  // output: Cold.
        Console.WriteLine(GetWeatherDisplay(27));  // output: Perfect!
        // </BasicExample>
    }

    private static void ConditionalRefExpressions()
    {
        // <SnippetConditionalRef>
        int[] smallArray = {1, 2, 3, 4, 5};
        int[] largeArray = {10, 20, 30, 40, 50};

        int index = 7;
        ref int refValue = ref ((index < 5) ? ref smallArray[index] : ref largeArray[index - 5]);
        refValue = 0;

        index = 2;
        ((index < 5) ? ref smallArray[index] : ref largeArray[index - 5]) = 100;

        Console.WriteLine(string.Join(" ", smallArray));
        Console.WriteLine(string.Join(" ", largeArray));
        // Output:
        // 1 2 100 4 5
        // 10 20 0 40 50
        // </SnippetConditionalRef>
    }

    private static void TargetTyped()
    {
        // <SnippetTargetTyped>
        var rand = new Random();
        var condition = rand.NextDouble() > 0.5;

        int? x = condition ? 12 : null;

        IEnumerable<int> xs = x is null ? new List<int>() { 0, 1 } : new int[] { 2, 3 };
        // </SnippetTargetTyped>
    }

    private static void NotTargetTyped()
    {
        // <SnippetNotTargetTyped>
        var rand = new Random();
        var condition = rand.NextDouble() > 0.5;

        var x = condition ? 12 : (int?)null;
        // </SnippetNotTargetTyped>
    }

    private static void ComparisonWithIf()
    {
        // <SnippetCompareWithIf>
        int input = new Random().Next(-5, 5);

        string classify;
        if (input >= 0)
        {
            classify = "nonnegative";
        }
        else
        {
            classify = "negative";
        }

        classify = (input >= 0) ? "nonnegative" : "negative";
        // </SnippetCompareWithIf>
    }
}