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It should be kept in mind that many books, including the titles recommended by this one, have code examples that can be fundamentally difficult to follow, in at least three ways First, most of them don t have any degree of explanation of the code until after it, even to explain the basic functionality of other code that the example uses They unfortunately don t employ the technique of telegraphing that is, explaining the basic flow of the example, then showing the code, and then explaining it in detail An effect of this is that interpreting the code can have a lot of gaps In reading untelegraphed code, skipping to the explanation and referencing the code along the way is the quickest way to understanding the example Second, many complex examples present the code in fragments, between sets of explanation text, with very little visual assistance.

Console.WriteLine("Object type : {0}", t.Name); FieldInfo[] fi = t.GetFields(); // Get the field info. foreach (var f in fi) Console.WriteLine(" Field : {0}", f.Name); Console.WriteLine(); } } }

This code produces the following output: Object type : BaseClass Field : BaseField Object type : DerivedClass Field : DerivedField Field : BaseField

print out this exception, as it will reveal errors in the script code. You can also get the file name, line number, and column number in which the error happened.

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You can also use the typeof operator to get a Type object. Just supply the name of the type as the operand, and it returns a reference to the Type object, as shown here: Type t = typeof( DerivedClass ); Operator Type you want the Type object for The following code shows a simple example of using the typeof operator: using System; using System.Reflection; namespace SimpleReflection { class BaseClass { public int MyFieldBase; } class DerivedClass : BaseClass { public int MyFieldDerived; } class Program { static void Main( ) { Type tbc = typeof(DerivedClass); Console.WriteLine("Result is {0}.", tbc.Name);

These fragments are from both the same class and differing classes, again with very little visual differentiation Even something as simple as separation lines between the text and the code, and a note-font class name header for each fragment, help to make all of the parts immediately distinctive This has an effect of losing conveyance of the organization of the code the whole point of object orientation The only compensation for this is reviewing the example, mentally combining the fragments in the appropriate ways And third, some of the examples ultimately seem functionally pointless, specifically because they use hard-coded values in places where variables make more sense They do this, of course, to make the examples shorter not requiring database access but they usually don t mention it; an effect is that actual purpose is not conveyed.

Typically, scripting languages are interpreted. What this means is that each time the scripting source is read, it is evaluated before executing. To optimize execution time, you can compile some of that source such that future executions are faster. That is where the Compilable interface comes into play. If a specific scripting engine also implements Compilable, then you can precompile scripts before execution. The compilation process involves the compile() method of Compilable, and returns a CompiledScript upon success. As shown in Listing 9-4, execution of the compiled script is now done with the eval() method of CompiledScript, instead of the ScriptEngine.

Console.WriteLine("It has the following fields:"); // Use the type. FieldInfo[] fi = tbc.GetFields(); foreach (var f in fi) Console.WriteLine(" {0}", f.Name); } } } This code produces the following output: Result is DerivedClass. It has the following fields: MyFieldDerived MyFieldBase

An attribute is a language construct that allows you to add metadata to a program s assembly. It is a special type of class for storing information about program constructs. The program construct to which you apply an attribute is called its target. Programs designed to retrieve and use metadata, such as object browsers, are said to be consumers of the attributes. There are attributes that are predefined in .NET, and you can also declare custom attributes. Figure 24-3 is an overview of the components involved in using attributes, and illustrates the following points about them: You apply attributes to program constructs in the source code. The compiler takes the source code and produces metadata from the attributes, and places that metadata in the assembly. Consumer programs can access the metadata of the attributes along with the metadata for the rest of the components of the program. Notice that the compiler both produces and consumes attributes.

They could refer to variables that they explain come from an unseen database access, but they often don t In these cases, a mental substitution of variables from a database helps to establish purpose..

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