As you know, a Pointer is a variable which holds
the address of another variable. If we want to use a pointer in C# then we use the "unsafe" keyword for that purpose. Unsafe code is code which does not executed
under the full management of common language runtime (CLR). It can cause some
problems therefore each use must be marked as "unsafe". Unsafe code is also
known as unmanaged code because it is not execute under the full management of
CLR. There are two types of code in C#, Which are as follows:
- Manages code
- Unmanaged code
Managed Code : The code which is
executed under the full management of CLR, is called managed code. Managed Code
include programmers convenience and enhanced security .
Unmanaged code : The code which
does not executed under the full management of common language runtime (CLR), is
called unmanaged code. We can say unmanaged code is directly executed by the
computer's CPU.
To set the compiler option in the Visual Studio
development environment
OR
When we run the the program then there will be
an error corresponding to unsafe code. For remove this error we go to
application properties.
Now we will go to build option and check the
Allow unsafe code.
Run application (Press F5).
To set compiler option programmatically
First of all we write the program on notepad
then save in any drive with name "unsafe.cs".
When we compile this program then we write
"csc/unsafe unsafe.cs".
Summary
So unsafe code is unmanaged code i.e. which
does not execute under full management of CLR. We can say that, when we want use
of pointer in C# then we will use unsafe keyword.