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The following conversions are classified as implicit conversions:
Implicit numeric conversions
Implicit enumeration conversions.
Implicit reference conversions
Implicit constant expression conversions
User-defined implicit conversions
Implicit conversions can occur in a variety of situations, including function member invocations (§7.4.3), cast expressions (§7.6.8), and assignments (§7.13).
The pre-defined implicit conversions always succeed and never cause exceptions to be thrown. Properly designed user-defined implicit conversions should exhibit these characteristics as well.
An identity conversion converts from any type to the same type. This conversion exists only such that an entity that already has a required type can be said to be convertible to that type.
The implicit numeric conversions are:
From sbyte to short, int, long, float, double, or decimal.
From byte to short, ushort, int, uint, long, ulong, float, double, or decimal.
From short to int, long, float, double, or decimal.
From ushort to int, uint, long, ulong, float, double, or decimal.
From int to long, float, double, or decimal.
From uint to long, ulong, float, double, or decimal.
From long to float, double, or decimal.
From ulong to float, double, or decimal.
From char to ushort, int, uint, long, ulong, float, double, or decimal.
From float to double.
Conversions from int, uint, or long to float and from long to double may cause a loss of precision, but will never cause a loss of magnitude. The other implicit numeric conversions never lose any information.
There are no implicit conversions to the char type. This in particular means that values of the other integral types do not automatically convert to the char type.
An implicit enumeration conversion permits the decimal-integer-literal 0 to be converted to any enum-type.
The implicit reference conversions are:
From any reference-type to object.
From any class-type S to any class-type T, provided S is derived from T.
From any class-type S to any interface-type T, provided S implements T.
From any interface-type S to any interface-type T, provided S is derived from T.
From an array-type S with an element type SE to an array-type T with an element type TE, provided all of the following are true:
S and T differ only in element type. (In other words, S and T have the same number of dimensions.)
Both SE and TE are reference-types.
An implicit reference conversion exists from SE to TE.
From any array-type to System.Array.
From any delegate-type to System.Delegate.
From any array-type or delegate-type to System.ICloneable.
From the null type to any reference-type.
The implicit reference conversions are those conversions between reference-types that can be proven to always succeed, and therefore require no checks at run-time.
Reference conversions, implicit or explicit, never change the referential identity of the object being converted. In other words, while a reference conversion may change the type of the reference, it never changes the type or value of the object being referred to.
A boxing conversion permits any value-type to be implicitly converted to the type object or to any interface-type implemented by the value-type. Boxing a value of a value-type consists of allocating an object instance and copying the value-type value into that instance.
Boxing conversions are described further in §4.3.1.
An implicit constant expression conversion permits the following conversions:
A constant-expression (§7.15) of type int can be converted to type sbyte, byte, short, ushort, uint, or ulong, provided the value of the constant-expression is within the range of the destination type.
A constant-expression of type long can be converted to type ulong, provided the value of the constant-expression is not negative.
A user-defined implicit conversion consists of an optional standard implicit conversion, followed by execution of a user-defined implicit conversion operator, followed by another optional standard implicit conversion. The exact rules for evaluating user-defined conversions are described in §6.4.3.
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