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The internal modifier applies mostly to the use of an assembly, which for C# loosely means a deployable program or library The internal modifier is examined in 16 When a member of a class is modified by the public specifier, that member can be accessed by any other code in your program This includes methods defined inside other classes When a member of a class is specified as private, then that member can be accessed only by other members of its class Thus, methods in other classes are not able to access a private member of another class As explained in 6, if no access specifier is used, a class member is private to its class by default Thus, the private specifier is optional when creating private class members An access specifier precedes the rest of a member s type specification That is, it must begin a member s declaration statement Here are some examples:
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public string errMsg; private double bal; private bool isError(byte status) { //
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To understand the difference between public and private, consider the following program:
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// Public vs private access using System; class MyClass { private int alpha; // private access explicitly specified int beta; // private access by default public int gamma; // public access // Methods to access alpha and beta It is OK for a member // of a class to access a private member of the same class public void SetAlpha(int a) { alpha = a; } public int GetAlpha() { return alpha; } public void SetBeta(int a) { beta = a; } public int GetBeta() { return beta; } } class AccessDemo { static void Main() { MyClass ob = new MyClass();
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8:
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A Closer Look at Methods and Classes
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// Access to alpha and beta is allowed only through methods obSetAlpha(-99); obSetBeta(19); ConsoleWriteLine("obalpha is " + obGetAlpha()); ConsoleWriteLine("obbeta is " + obGetBeta()); // You cannot access alpha or beta like this: obalpha = 10; // Wrong! alpha is private! obbeta = 9; // Wrong! beta is private! // It is OK to directly access gamma because it is public obgamma = 99; } }
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PART I PART I PART I
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As you can see, inside the MyClass class, alpha is specified as private, beta is private by default, and gamma is specified as public Because alpha and beta are private, they cannot be accessed by code outside of their class Therefore, inside the AccessDemo class, neither can be used directly Each must be accessed through public methods, such as SetAlpha( ) and GetAlpha( ) For example, if you were to remove the comment symbol from the beginning of the following line
// obalpha = 10; // Wrong! alpha is private!
you would not be able to compile this program because of the access violation Although access to alpha by code outside of MyClass is not allowed, methods defined within MyClass can freely access it, as the SetAlpha( ) and GetAlpha( ) methods show The same is true for beta The key point is this: A private member can be used freely by other members of its class, but it cannot be accessed by code outside its class
Applying Public and Private Access
The proper use of public and private access is a key component of successful object-oriented programming Although there are no hard and fast rules, here are some general principles that serve as guidelines: Members of a class that are used only within the class itself should be private Instance data that must be within a specific range should be private, with access provided through public methods that can perform range checks If changing a member can cause an effect that extends beyond the member itself (that is, affects other aspects of the object), that member should be private, and access to it should be controlled Members that can cause harm to an object when improperly used should be private Access to these members should be through public methods that prevent improper usage Methods that get and set the values of private data must be public Public instance variables are permissible when there is no reason for them to be private
Part I:
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