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This is the only change you have to make; the application code doesn t have to change at all, although you must rebuild it to see the new behavior . Now when the application s Main method runs, the CLR will load the DLL assembly (so this assembly is now required at run time) and grab the value of the MaxEntriesInList field out of the dynamic memory allocated for it . Of course, the value will be 50. Let s say that the developer of the DLL assembly changes the 50 to 1000 and rebuilds the assembly . When the application code is re-executed, it will automatically pick up the new value: 1000. In this case, the application code doesn t have to be rebuilt it just works (although its performance is adversely affected) . A caveat: this scenario assumes that the new version of the DLL assembly is not strongly named and the versioning policy of the application is such that the CLR loads this new version . The following example shows how to define a readonly static field that is associated with the type itself, as well as read/write static fields and readonly and read/write instance fields, as shown here:

A program contains code that seems like it might be needed someday Programmers are notoriously bad at guessing what functionality might be needed someday. Designing ahead is subject to numerous predictable problems:

Analyze="True"

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public sealed class SomeType { // This is a static read-only field; its value is calculated and // stored in memory when this class is initialized at run time. public static readonly Random s_random = new Random(); // This is a static read/write field. private static Int32 s_numberOfWrites = 0; // This is an instance read-only field. public readonly String Pathname = "Untitled"; // This is an instance read/write field. private System.IO.FileStream m_fs; public SomeType(String pathname) { // This line changes a read-only field. // This is OK because the code is in a constructor. this.Pathname = pathname; } public String DoSomething() { // This line reads and writes to the static read/write field. s_numberOfWrites = s_numberOfWrites + 1; // This line reads the read-only instance field. return Pathname; } }

Requirements for the design ahead code haven t been fully developed, which means the programmer will likely guess wrong about those future requirements. The code ahead work will ultimately be thrown away. If the programmer s guess about the future requirement is pretty close, the programmer still will not generally anticipate all the intricacies of the future requirement. These intricacies undermine the programmer s basic design assumptions, which means the design ahead work will have to be thrown away. Future programmers who find the code that was designed ahead might assume that the code works better than it does. They can waste a lot of time building code that uses the design ahead code, only to discover ultimately that the design head code won t actually work. Future programmers who use the design ahead code don t know that it was design ahead code; they assume that it has been coded, tested, and reviewed to the same level as the other code. This ultimately leads to errors in the production system arising from faulty assumptions about the completeness of the design ahead work. The additional design ahead code creates additional complexity, which calls for additional testing, additional defect correction, and so on. The overall effect is to slow down the project

In this code, many of the fields are initialized inline . C# allows you to use this convenient inline initialization syntax to initialize a class s constants and read/write and readonly fields . As you ll see in 8, Methods, C# treats initializing a field inline as shorthand syntax for initializing the field in a constructor . Also, in C#, there are some performance issues to consider when initializing fields by using inline syntax versus assignment syntax in a constructor . These performance issues are discussed in 8 as well . Important When a field is of a reference type and the field is marked as readonly, it is

Experts agree that the best way to prepare for future requirements is not to write speculative code; it s to make the currently required code as clear and straightforward as possible so that future programmers will know what it does and does not do, and can make their changes accordingly (Fowler 1999, Beck 2000).

the reference that is immutable, not the object that the field refers to . The following code demonstrates:

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