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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