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The order in which patterns are checked is undefined. To explicitly specify the precedence, use parentheses, as the following example shows: static bool IsLetter(char c) => c is (>= 'a' and = 'A' and <= 'Z') The following list orders pattern combinators starting from the highest precedence to the lowest: Cover with a piece of old carpet and turn every so often with a garden fork to aerate. Use the mower to shred them to the right consistency then layer up with grass clippings and kitchen compost to help them break down. "),Īs the preceding example shows, you can repeatedly use the pattern combinators in a pattern. Add autumn leaves to the compost heap to work their magic in time for spring planting. The following example demonstrates two cases when this condition is true: var numbers = new int. The run-time type of an expression result derives from type T, implements interface T, or another implicit reference conversion exists from it to T. The run-time type of an expression result is T. When a declaration pattern matches an expression, that variable is assigned a converted expression result, as the following example shows: object greeting = "Hello, World!" Ĭonsole.WriteLine(message.ToLower()) // output: hello, world!īeginning with C# 7.0, a declaration pattern with type T matches an expression when an expression result is non-null and any of the following conditions are true: With a declaration pattern, you can also declare a new local variable. You use declaration and type patterns to check if the run-time type of an expression is compatible with a given type.
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That is, they can contain nested patterns.įor the example of how to use those patterns to build a data-driven algorithm, see Tutorial: Use pattern matching to build type-driven and data-driven algorithms. Logical, property, and positional patterns are recursive patterns. Discard pattern: to match any expression.
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var pattern: to match any expression and assign its result to a declared variable.Positional pattern: to deconstruct an expression result and test if the resulting values match nested patterns.Property pattern: to test if an expression's properties or fields match nested patterns.Logical patterns: to test if an expression matches a logical combination of patterns.Relational patterns: to compare an expression result with a specified constant.Constant pattern: to test if an expression result equals a specified constant.Type pattern: to check the run-time type of an expression.
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Declaration pattern: to check the run-time type of an expression and, if a match succeeds, assign an expression result to a declared variable.In those constructs, you can match an input expression against any of the following patterns: switch expression (introduced in C# 8.0).The following C# expressions and statements support pattern matching: Since then, each major C# version extends pattern matching capabilities. C# introduced pattern matching in C# 7.0.