Oli Sturm
44 lines
1.5 KiB
C#
44 lines
1.5 KiB
C#
namespace CS9 {
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class Program {
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// Relational patterns (>= operator et al.)
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// Logical patterns ("or", also "and" and "not")
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// Note: parens ( and ) can be used to determine precedence
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bool IsPastMidYear(DateTime dt) => dt is { Month: >= 7 };
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bool IsThisYearOrLast(DateTime dt) => dt is { Year: 2022 or 2021 };
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bool IsSummer(DateTime dt) => dt is
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{ Month: 7 or 8 } or
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{ Month: 6, Day: >= 21 } or
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{ Month: 9, Day: < 21 };
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// Class with "Deconstruct" implementation
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class Order {
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public int ItemCount { get; set; }
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public double ItemPrice { get; set; }
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public void Deconstruct(out int itemCount, out double itemPrice) {
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itemCount = ItemCount;
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itemPrice = ItemPrice;
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}
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}
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// Positional patterns with placeholders - note that
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// the element lists must be "complete"!
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static OrderValue OrderValueCategory(Order o) =>
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o switch
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{
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( < 0, _) => throw new ArgumentException("Positive itemCounts please!"),
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(_, < 0) => throw new ArgumentException("Positive itemPrices please!"),
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( >= 100, _) => OrderValue.ValuableDueToHighCount,
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(_, >= 1000) => OrderValue.ValuableDueToHighItemPrice,
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// Assign variable names for further processing
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var (c, p) when c * p > 1000 => OrderValue.ValuableDueToHighTotal,
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_ => OrderValue.NotValuable
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};
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static void Main(string[] args) {
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}
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}
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}
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