Get the byte size of type | VB.Net

In VB.NET, you can get the size of a data type or structure using the Marshal.SizeOf method from the System.Runtime.InteropServices namespace. This method provides the size in bytes required to store an instance of the specified type or structure in memory.

Marshal.SizeOf()

Syntax
Public Shared Function SizeOf(t As Type) As Integer
Parameters

t (Type): The type or structure for which you want to determine the size.

Return Value

The method returns an integer representing the size in bytes.

Example
Imports System Imports System.Runtime.InteropServices Module Program Structure MyStruct Public Field1 As Integer Public Field2 As Double End Structure Sub Main() Dim sizeOfInteger As Integer = Marshal.SizeOf(GetType(Integer)) Dim sizeOfMyStruct As Integer = Marshal.SizeOf(GetType(MyStruct)) Console.WriteLine("Size of Integer: " & sizeOfInteger) Console.WriteLine("Size of MyStruct: " & sizeOfMyStruct) End Sub End Module ' Output: ' Size of Integer: 4 ' Size of MyStruct: 16

In this example:

  1. We import the System.Runtime.InteropServices namespace to access the Marshal.SizeOf method.
  2. We define a structure MyStruct with two fields of different data types.
  3. We use Marshal.SizeOf(GetType(Integer)) and Marshal.SizeOf(GetType(MyStruct)) to determine the sizes of the Integer and MyStruct types, respectively.

Marshal.SizeOf() method

You can also use the Marshal.SizeOf() method to get the size of a custom type. For example, the following code gets the size of a custom type named MyType:

Imports System.Runtime.InteropServices Public Class MyType Public Property Name As String Public Property Age As Integer End Class Public Class Program Public Shared Sub Main() ' Get the size of the MyType type in bytes. Dim size As Integer = Marshal.SizeOf(MyType) ' Print the size to the console. Console.WriteLine(size.ToString()) End Sub End Class " Output: 16

The Marshal.SizeOf() method is a useful tool for determining the size of types in your VB.NET code. This information can be helpful for optimizing your code and managing memory resources.

Conclusion

You can obtain the size of a data type or structure using the Marshal.SizeOf method from the System.Runtime.InteropServices namespace. This method returns the size in bytes required to store an instance of the specified type or structure in memory, providing valuable information for memory optimization and memory usage analysis in your VB.NET applications.






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