![]() For more information, see User-defined conversion operators.Ĭonversions with helper classes: To convert between non-compatible types, such as integers and System.DateTime objects, or hexadecimal strings and byte arrays, you can use the System.BitConverter class, the System.Convert class, and the Parse methods of the built-in numeric types, such as Int32.Parse. User-defined conversions: User-defined conversions are performed by special methods that you can define to enable explicit and implicit conversions between custom types that do not have a base class–derived class relationship. Typical examples include numeric conversion to a type that has less precision or a smaller range, and conversion of a base-class instance to a derived class. Casting is required when information might be lost in the conversion, or when the conversion might not succeed for other reasons. Examples include conversions from smaller to larger integral types, and conversions from derived classes to base classes.Įxplicit conversions (casts): Explicit conversions require a cast expression. ![]() Implicit conversions: No special syntax is required because the conversion always succeeds and no data will be lost. In C#, you can perform the following kinds of conversions: These kinds of operations are called type conversions. Or you might need to assign a class variable to a variable of an interface type. For example, you might have an integer variable that you need to pass to a method whose parameter is typed as double. However, you might sometimes need to copy a value into a variable or method parameter of another type. ![]() error CS0029: Cannot implicitly convert type 'string' to 'int' Therefore, after you declare i as an int, you cannot assign the string "Hello" to it, as the following code shows: int i For example, the string cannot be implicitly converted to int. Because C# is statically-typed at compile time, after a variable is declared, it cannot be declared again or assigned a value of another type unless that type is implicitly convertible to the variable's type. ![]()
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