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As the preceding section described, you can use partial to create a partial type Beginning with C# 30, there is a second use of partial that lets you create a partial method within a partial type A partial method has its declaration in one part and its implementation in another part Thus, in a partial class or structure, partial can be used to allow the declaration of a method to be separate from its implementation The key aspect of a partial method is that the implementation is not required! When the partial method is not implemented by another part of the class or structure, then all calls to the partial method are silently ignored This makes it possible for a class to specify, but not require, optional functionality If that functionality is not implemented, then it is simply ignored Here is an expanded version of the preceding program that creates a partial method called Show( ) It is called by another method called ShowXY( ) (For convenience, all pieces of the partial class XY are shown in one file, but they could have been organized into separate files, as illustrated in the preceding section)
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// Demonstrate a partial method using System; partial class XY { public XY(int a, int b) { X = a; Y = b; } // Declare a partial method partial void Show(); } partial class XY { public int X { get; set; }
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U n s a f e C o d e , P o i n t e r s , N u l l a b l e Ty p e s , a n d M i s c e l l a n e o u s To p i c s
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// Implement a partial method partial void Show() { ConsoleWriteLine("{0}, {1}", X, Y); } } partial class XY { public int Y { get; set; } // Call a partial method public void ShowXY() { Show(); } } class Test { static void Main() { XY xy = new XY(1, 2); xyShowXY(); } }
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PART I PART I PART I
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Notice that Show( ) is declared in one part of XY and implemented by another part The implementation displays the values of X and Y This means that when Show( ) is called by ShowXY( ), the call has effect, and it will, indeed, display X and Y However, if you comment-out the implementation of Show( ), then the call to Show( ) within ShowXY( ) does nothing Partial methods have several restrictions, including these: They must return void They cannot have access modifiers They cannot be virtual They cannot use out parameters
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It is possible to make one assembly the friend of another A friend has access to the private members of the assembly of which it is a friend This feature makes it possible to share members between selected assemblies without making those members public To declare a friend assembly, you must specify the friend assembly s name and its public key token in an InternalsVisibleTo attribute
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Miscellaneous Keywords
To conclude Part I, the few remaining keywords defined by C# that have not been described elsewhere are briefly discussed
lock
The lock keyword is used when creating multithreaded programs It is examined in detail in 23, where multithreaded programming is discussed A brief description is given here for the sake of completeness
Part I:
The C# Language
In C#, a program can contain more than one thread of execution When this is the case, the program is said to be multithreaded, and pieces of the program are executed concurrently Thus, pieces of the program execute independently and simultaneously This raises the prospect of a special type of problem: What if two threads try to use a resource that can be used by only one thread at a time To solve this problem, you can create a critical code section that will be executed by one and only one thread at a time This is accomplished by lock Its general form is shown here: lock(obj) { // critical section } Here, obj is the object on which the lock is synchronized If one thread has already entered the critical section, then a second thread will wait until the first thread exits the critical section When the first thread leaves the critical section, the lock is released and the second thread can be granted the lock, at which point the second thread can execute the critical section
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