C# Internal, Protected and Protected Internal

C# Internal, Protected and Protected Internal

Let's discuss the concepts of internal, protected, and protected internal in C#.

  1. internal Access Modifier:

    • The internal access modifier limits the visibility of a member or type to the current assembly.
    • An internal member is accessible within the same assembly but not from other assemblies.
    • It is often used to define types or members that should only be accessed within the assembly where they are defined.
    • Example:
      internal class MyClass
{
    internal int MyProperty { get; set; }
    internal void MyMethod() { }
}

  2. protected Access Modifier:

    • The protected access modifier allows access to a member or type within the declaring class and derived classes.
    • It is used to provide inheritance-specific access and enables derived classes to access the members of the base class.
    • protected members are not accessible from outside the class hierarchy, i.e., not directly accessible by instances of the class.
    • Example:
      public class MyBaseClass
{
    protected int MyProtectedField;
    protected void MyProtectedMethod() { }
}

public class MyDerivedClass : MyBaseClass
{
    public void AccessProtectedMembers()
    {
        MyProtectedField = 10;
        MyProtectedMethod();
    }
}

  3. protected internal Access Modifier:

    • The protected internal access modifier combines the behavior of both protected and internal.
    • It allows access to a member or type within the current assembly and by derived classes, regardless of the assembly they belong to.
    • It is commonly used when you want to expose a member to derived classes and to other classes within the same assembly.
    • Example:
      public class MyBaseClass
{
    protected internal int MyProtectedInternalField;
    protected internal void MyProtectedInternalMethod() { }
}

public class MyDerivedClass : MyBaseClass
{
    public void AccessProtectedInternalMembers()
    {
        MyProtectedInternalField = 10;
        MyProtectedInternalMethod();
    }
}

public class MyClassInSameAssembly
{
    public void AccessProtectedInternalMembers()
    {
        var obj = new MyBaseClass();
        obj.MyProtectedInternalField = 20;
        obj.MyProtectedInternalMethod();
    }
}

By understanding and using these access modifiers appropriately, you can control the visibility and accessibility of members and types in your C# code. Choose the appropriate access modifier based on the desired level of encapsulation and access requirements for your classes and members.

Examples

  1. "C# Internal access modifier example"

    • Code Implementation:
      internal class InternalClass
{
    // Members with internal access
    internal void InternalMethod()
    {
        // Internal method implementation
    }
}
    • Description: This code showcases the use of the internal access modifier, restricting access to the class and its members within the same assembly.

  2. "C# Protected access modifier example"

    • Code Implementation:
      internal class BaseClass
{
    // Members with protected access
    protected void ProtectedMethod()
    {
        // Protected method implementation
    }
}

internal class DerivedClass : BaseClass
{
    // Access to the protected method inherited from the base class
    internal void UseProtectedMethod()
    {
        ProtectedMethod();
    }
}
    • Description: This code demonstrates the use of the protected access modifier, allowing access to members within the same assembly and in derived classes.

  3. "C# Protected Internal access modifier example"

    • Code Implementation:
      internal class BaseClass
{
    // Members with protected internal access
    protected internal void ProtectedInternalMethod()
    {
        // Protected internal method implementation
    }
}

internal class DerivedClass : BaseClass
{
    // Access to the protected internal method inherited from the base class
    internal void UseProtectedInternalMethod()
    {
        ProtectedInternalMethod();
    }
}
    • Description: This code illustrates the use of the protected internal access modifier, allowing access to members within the same assembly, in derived classes, and across assemblies.

  4. "C# Internal vs Protected access modifier"

    • Code Implementation:
      internal class BaseClass
{
    internal void InternalMethod()
    {
        // Internal method implementation
    }

    protected void ProtectedMethod()
    {
        // Protected method implementation
    }
}
    • Description: This code compares the internal and protected access modifiers within the same class, emphasizing their respective scopes and accessibility.

  5. "C# Protected Internal best practices"

    • Code Implementation:
      internal class BaseClass
{
    // Best practice: Document the intended usage of protected internal members
    protected internal void ProtectedInternalMethod()
    {
        // Implementation of the protected internal method
    }
}
    • Description: This code suggests documenting the intended usage of protected internal members as a best practice to enhance code readability and maintainability.

  6. "C# Internal, Protected Internal in inheritance"

    • Code Implementation:
      internal class BaseClass
{
    // Internal method in the base class
    internal void InternalMethod()
    {
        // Implementation of the internal method
    }

    // Protected internal method in the base class
    protected internal void ProtectedInternalMethod()
    {
        // Implementation of the protected internal method
    }
}

internal class DerivedClass : BaseClass
{
    internal void UseBaseClassMembers()
    {
        InternalMethod();            // Accessing internal method
        ProtectedInternalMethod();   // Accessing protected internal method
    }
}
    • Description: This code demonstrates the use of internal and protected internal members in a base class and their accessibility in a derived class.

  7. "C# Internal class with Protected method"

    • Code Implementation:
      internal class InternalClass
{
    // Internal class with a protected method
    protected void ProtectedMethod()
    {
        // Implementation of the protected method
    }
}
    • Description: The code illustrates an internal class containing a protected method, demonstrating the combination of access modifiers within the same class.

  8. "C# Internal Protected Internal conflicts"

    • Code Implementation:
      // This will result in a compilation error: 'BaseClass.ProtectedMethod()' is inaccessible due to its protection level
internal class BaseClass
{
    protected void ProtectedMethod()
    {
        // Implementation of the protected method
    }
}

internal class DerivedClass : BaseClass
{
    internal void UseProtectedMethod()
    {
        ProtectedMethod();   // Attempting to access the protected method
    }
}
    • Description: The code demonstrates a compilation error that occurs when attempting to access a protected method from a class with a lower access level.

  9. "C# Internal Protected Internal in different assemblies"

    • Code Implementation:

      // Assembly A
internal class BaseClass
{
    protected internal void ProtectedInternalMethod()
    {
        // Implementation of the protected internal method
    }
}

      // Assembly B
internal class DerivedClass : BaseClass
{
    internal void UseProtectedInternalMethod()
    {
        ProtectedInternalMethod();   // Accessing protected internal method from a different assembly
    }
}

    • Description: This code demonstrates the accessibility of protected internal members across different assemblies when the classes are marked as internal.

  10. "C# Internal Protected Internal with inheritance"

    • Code Implementation:
      internal class BaseClass
{
    // Protected internal method in the base class
    protected internal void ProtectedInternalMethod()
    {
        // Implementation of the protected internal method
    }
}

internal class DerivedClass : BaseClass
{
    internal void UseProtectedInternalMethod()
    {
        ProtectedInternalMethod();   // Accessing protected internal method from the derived class
    }
}
    • Description: The code showcases a base class with a protected internal method and a derived class that accesses and uses the protected internal method.

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