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Use a high-quality design. Make the program right. Make it modular and easily modifiable so that it s easy to work on later. When it s complete and correct, check the performance. If the program lumbers, make it fast and small. Don t optimize until you know you need to. A few years ago I worked on a C++ project that produced graphical outputs to analyze investment data. After my team got the first graph working, testing reported that the program took about 45 minutes to draw the graph, which was clearly not acceptable. We held a team meeting to decide what to do about it. One of the developers became irate and shouted, If we want to have any chance of releasing an acceptable product we ve got to start rewriting the whole code base in assembler right now. I responded that I didn t think so that 4 percent of the code probably accounted for 50 percent or more of the performance bottleneck. It would be best to address that 4 percent toward the end of the project. After a bit more shouting, our manager assigned me to do some initial performance work (which was really a case of Oh no! Please don t throw me into that briar patch! ). As is often the case, a day s work identified a couple of glaring bottlenecks in the code, and a small number of code-tuning changes reduced the drawing time from 45 minutes to less than 30 seconds. Far less than 1 percent of the code accounted for 90 percent of the run time. By the time we released the software months later, several additional code-tuning changes reduced that drawing time to a little more than 1 second.

StyleCop works on a different level than FxCop. It can do some of the checks that FxCop is unable to do because the translation process erases or changes some of the source code information. For example, the length of each line in the source file doesn t carry over to the compiled assembly. The information will be lost, but some developers like to have a maximum line length for their source files. You can easily check this using StyleCop. Prepare a new project named CiDotNet.StyleCop. Copy the Microsoft.StyleCop.dll and Microsoft.StyleCop.CSharp.dll files to the lib directory of the project. Add a reference for each DLL to the project. Then examine the following listing for implementation details. Listing 8.6 StyleCop rule: line length must not exceed a set number of characters

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When you define a generic class, struct, or interface, any methods defined in these types can refer to a type parameter specified by the type . A type parameter can be used as a method s parameter, a method s return value, or as a local variable defined inside the method . However, the CLR also supports the ability for a method to specify its very own type parameters . And these type parameters can also be used for parameters, return values, or local variables . Here is a somewhat contrived example of a type that defines a type parameter and a method that has its very own type parameter:

Modern compiler optimizations might be more powerful than you expect. In the case I described earlier, my compiler did as good a job of optimizing a nested loop as I was able to do by rewriting the code in a supposedly more efficient style. When shopping for a compiler, compare the performance of each compiler on your program. Each compiler has different strengths and weaknesses, and some will be better suited to your program than others. Optimizing compilers are better at optimizing straightforward code than they are at optimizing tricky code. If you do clever things like fooling around with loop indexes, your compiler has a harder time doing its job and your program suffers. See Using Only One Statement per Line in Section 31.5, for an example in which a straightforward approach resulted in compiler-optimized code that was 11 percent faster than comparable tricky code.

internal sealed class GenericType<T> { private T m_value; public GenericType(T value) { m_value = value; } public TOutput Converter<TOutput>() { TOutput result = (TOutput) Convert.ChangeType(m_value, typeof(TOutput)); return result; } }

With a good optimizing compiler, your code speed can improve 40 percent or more across the board. Many of the techniques described in the next chapter produce gains of only 15-30 percent. Why not just write clear code and let the compiler do the work Here are the results of a few tests to check how much an optimizer speeded up an insertion-sort routine:

In this example, you can see that the GenericType class defines its own type parameter (T), and the Converter method defines its own type parameter (TOutput) . This allows a GenericType to be constructed to work with any type . The Converter method can convert the object referred to by the m_value field to various types depending on what type argument is passed to it when called . The ability to have type parameters and method parameters allows for phenomenal flexibility .

A reasonably good example of a generic method is the Swap method:

Time Without Compiler Optimizations 2.21 2.78 2.43 1.55 1.78 2.77 1.39 2.63 Time with Compiler Optimizations 1.05 1.15 1.25 1.55 1.78 2.77 1.38 2.63 Performance Ratio 2:1 2.5:1 2:1 1:1 1:1 1:1 1:1 1:1