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() Operator (C# Reference)

In addition to being used to specify the order of operations in an expression, parentheses are used to perform the following tasks:

  1. Specify casts, or type conversions.

    double x = 1234.7;
    int a;
    a = (int)x; // Cast double to int    
    
  2. Invoke methods or delegates.

    TestMethod();
    

A cast explicitly invokes the conversion operator from one type to another; the cast fails if no such conversion operator is defined. To define a conversion operator, see explicit and implicit.

The () operator cannot be overloaded.

For more information, see Casting and Type Conversions (C# Programming Guide).

A cast expression could lead to ambiguous syntax. For example, the expression (x)–y could be either interpreted as a cast expression (a cast of –y to type x) or as an additive expression combined with a parenthesized expression, which computes the value x – y.

For more information on method invocation, see Methods (C# Programming Guide).

For more information, see the following sections in the C# Language Specification:

  • 1.6.7.5 Operators

  • 7.2 Operators

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