C# internal type or member can be accessed by any code in the same assembly, but not from another assembly.
Step 1: Create console application ConsoleApp1.
Step 2: Add new ClassLibrary (.net framework) in same solution TestLibrary.
Step 3: Add reference of TestLibrary in ConsoleApp1
Step 4: Add new class in TestLibrary project TestLibBaseClass and copy following code.
namespace TestLibrary
{
public class TestLibBaseClass
{
public int a;
private int b;
protected int c;
internal int d;
}
public class Derivedclass : TestLibBaseClass
{
public System.Collections.Generic.List DerivedOfTestMethod()
{
System.Collections.Generic.List testlibvar = new System.Collections.Generic.List();
//Public Member
testlibvar.Add(a);
//Private Member Not Accessible
//testlibvar.Add(b);
//Protected
testlibvar.Add(c);
//internal Member
testlibvar.Add(d);
return testlibvar;
}
}
}
Data Member 'b' of TestLibBaseClass in Derivedclass is not accessible due to private access modifier.
Step 5: Add new class in ConsoleApp1 project DerivedFromTestBase and copy following code.
using TestLibrary;
namespace ConsoleApp1
{
public class DerivedFromTestBase : TestLibBaseClass
{
public System.Collections.Generic.List DerivedMethod()
{
System.Collections.Generic.List testlibvar = new System.Collections.Generic.List();
//Public Member
testlibvar.Add(a);
//Private Member Not Accessible
//testlibvar.Add(b);
//Protected
testlibvar.Add(c);
//internal Member Not Accessible
//testlibvar.Add(d);
return testlibvar;
}
}
class Program
{
static void Main()
{
TestLibBaseClass tb = new TestLibBaseClass();
System.Console.WriteLine(tb.a);
}
}
}
In above code, DerivedFromTestBase private member 'b' and internal member 'd' is not accessible in another assembly while public 'a' is accessible even every where outside assembly.
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