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One other point: When the ! operator is applied to a bool value that is null, the outcome is null
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Beginning with C# 20, a class, structure, or interface definition can be broken into two or more pieces, with each piece residing in a separate file This is accomplished through the use of the partial contextual keyword When your program is compiled, the pieces are united When used to create a partial type, the partial modifier has this general form: partial type typename { // Here, typename is the name of the class, structure, or interface that is being split into pieces Each part of a partial type must be modified by partial Here is an example that divides a simple XY coordinate class into three separate files The first file is shown here:
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partial class XY { public XY(int a, int b) { X = a; Y = b; } }
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The second file is shown next:
partial class XY { public int X { get; set; } }
The third file is
partial class XY { public int Y { get; set; } }
The following file demonstrates the use of XY:
// Demonstrate partial class definitions using System;
Part I:
The C# Language
class Test { static void Main() { XY xy = new XY(1, 2);
ConsoleWriteLine(xyX + "," + xyY); } }
To use XY, all files must be included in the compile For example, assuming the XY files are called xy1cs, xy2cs, and xy3cs, and that the Test class is contained in a file called testcs, then to compile Test, use the following command line:
csc testcs xy1cs xy2cs xy3cs
One last point: It is legal to have partial generic classes However, the type parameters of each partial declaration must match the other parts
Partial Methods
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)
// 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; }
20:
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 , D y n a m i c 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
// 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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