Implicit and explicit type conversions in C#

Regarding implicit conversion and explicit conversion, every language has them, and C# is certainly no exception. Commonly used situations, one is when writing arithmetic expressions, the overall data type must be consistent and the calculation accurate. For example, if there is a variable a of type int, but it is obtained by addition, subtraction, multiplication and division, then in the operation You need to consider using explicit conversion. The division operation needs to be converted to float or double, and then the result is forced to be converted to int. Another is that when passing parameters, you need to pay attention to which ones require explicit conversion, or you should also pay attention to the type when assigning values ​​to a collection. The problem.
1. Implicit type conversion
The so-called implicit conversion is the system default conversion. Its essence is that data types with small storage capacity are automatically converted into data types with large storage capacity. There are the following types:
From sbyte type to short, int, long, float, double, or decimal type.

From byte type to short, ushort, int, uint, long, ulong, float, double, or decimal type.

From short type to int, long, float, double, or decimal type.

From ushort type to int, uint, long, ulong, float, double, or decimal type.

From int type to long, float, double, or decimal type.

From uint type to long, ulong, float, double, or decimal type.

From long type to float, double, or decimal type.

From ulong type to float, double, or decimal type.

From char type to ushort, int, uint, long, ulong, float, double, or decimal type.

From float type to double type.

2. Explicit type conversion

Explicit type conversion, that is, forced type conversion. Contrary to implicit conversion, casting causes data loss.

From sbyte to byte, ushort, uint, ulong, or char.

From byte to sbyte or char.

From short to sbyte, byte, ushort, uint, ulong, or char.

From ushort to sbyte, byte, short, or char.

From int to sbyte, byte, short, ushort, uint, ulong, or char.

From uint to sbyte, byte, short, ushort, int, or char.

From long to sbyte, byte, short, ushort, int, uint, ulong, or char.

From ulong to sbyte, byte, short, ushort, int, uint, long, or char.

From char to sbyte, byte, or short.

From float to sbyte, byte, short, ushort, int, uint, long, ulong, char, or decimal.

From double to sbyte, byte, short, ushort, int, uint, long, ulong, char, float, or decimal.

From decimal to sbyte, byte, short, ushort, int, uint, long, ulong, char, float, or double.

When the conversion loses information or causes an exception to be thrown, the conversion is performed according to the following rules:

For conversions from one integer type to another, the compiler will perform the conversion Overflow detection, if no overflow occurs, the conversion is successful, otherwise an OverflowException is thrown. This detection is also related to whether the checked option is set in the compiler.

For conversion from float, double, or decimal to integer, the value of the source variable is rounded to the nearest integer value as the result of the conversion. If the integer value exceeds the range of the target type, an OverflowException will be thrown.

For conversion from double to float, the double value is rounded to the nearest float value. If this value is too small, the result will become positive 0 or negative 0; if this value is too large, it will become positive
infinity or negative infinity. If the original double value is Nan, the conversion result is also NaN.

For conversion from float or double to decimal, the source value is converted to decimal form and rounded to 28 decimal places (if necessary). If the source value is too small, the result is 0; if it is too large to be represented by a decimal, or it is infinity or NaN, an InvalidCastException will be thrown.

For conversion from decimal to float or double, the decimal value is rounded to the nearest value. This conversion may lose precision but does not cause exceptions.

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