Type Conversions in VB.NET

In this article I will explain you about type conversion in VB.NET.
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Conversion allows you to treat one type as another. For example, storing an integer value in a long variable constitutes conversion from integer to a long. VB supports limited implicit conversions as well as explicit conversions. 

With implicit conversions, you pass a type to another type without losing any data. Conversion from short to long-or from int to long, in the case that follows-is an example of implicit conversion. 


Dim num1 As Integer = 34 
Dim num2 As Long = a 


Implicit conversion is only possible when you pass a small-range type to a big-range type. A long data type can hold short and int values with no problem, but the reverse is not true without risking data loss. Some of the implicit conversions are as follows:

  • 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.

In explicit conversions, you must cast a type with another type to pass data between them. For example, conversion from long to int is handled explicitly, as follows: 

Dim num1 As Long = 3443 
Dim num2 As Integer = CInt(a)


Some possible explicit conversions are as follows:

  • 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.

However, prudent testing is always advisable to determine whether a conversion will cause loss of data or the unexpected conversion of values.

Conclusion 

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