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

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

70 строк2 KB

Bill Wagner

revert collection expression (#39020)

10 янв 2024, 18:01

10 янв 2024, 18:01ad8f51f

namespace operators;

public static class Overview
{
    public static void Examples()
    {
        GeneralExamples();
        InterpolatedString();
        Lambda();
        Query();
    }

    private static readonly int[] collection = [1, 2, 3];

    private static void GeneralExamples()
    {
        // <SnippetExpressions>
        int a, b, c;
        a = 7;
        b = a;
        c = b++;
        b = a + b * c;
        c = a >= 100 ? b : c / 10;
        a = (int)Math.Sqrt(b * b + c * c);
        
        string s = "String literal";
        char l = s[s.Length - 1];

        List<int> numbers = [..collection];
        b = numbers.FindLast(n => n > 1);
        // </SnippetExpressions>
    }

    private static void InterpolatedString()
    {
        // <SnippetInterpolatedString>
        var r = 2.3;
        var message = $"The area of a circle with radius {r} is {Math.PI * r * r:F3}.";
        Console.WriteLine(message);
        // Output:
        // The area of a circle with radius 2.3 is 16.619.
        // </SnippetInterpolatedString>
    }

    private static void Lambda()
    {
        // <SnippetLambda>
        int[] numbers = { 2, 3, 4, 5 };
        var maximumSquare = numbers.Max(x => x * x);
        Console.WriteLine(maximumSquare);
        // Output:
        // 25
        // </SnippetLambda>
    }

    private static void Query()
    {
        // <SnippetQuery>
        int[] scores = { 90, 97, 78, 68, 85 };
        IEnumerable<int> highScoresQuery =
            from score in scores
            where score > 80
            orderby score descending
            select score;
        Console.WriteLine(string.Join(" ", highScoresQuery));
        // Output:
        // 97 90 85
        // </SnippetQuery>
    }
}