c# generate barcode from string Reflection in C#

Generation QR in C# Reflection

14
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Reflection
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// Get the static HtmlEncode and HtmlDecode methods MethodInfo encode = utilType.GetMethod("HtmlEncode", new Type[] { typeof(string) }); MethodInfo decode = utilType.GetMethod("HtmlDecode", new Type[] { typeof(string) }); // Create a string to be encoded string originalString = "This is Sally & Jack's Anniversary <sic>"; Console.WriteLine(originalString); // encode it and show the encoded value string encoded = (string) encode.Invoke(null, new object[] { originalString }); Console.WriteLine(encoded); // decode it to make sure it comes back right string decoded = (string) decode.Invoke(null, new object[] { encoded }); Console.WriteLine(decoded); } }
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10. Build the project, and resolve any errors. Verify that the console application successfully encodes and decodes the string.
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Lesson Summary
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To create a new instance of a type, use the Type class and the ConstructorInfo class. To execute arbitrary code for a specific instance of a type, use the MemberInfo classes. To execute static code that is associated with a specific type, use the MemberInfo classes.
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Lesson Review
Make UPC Code In Objective-C
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Barcode Generation In Java
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You can use the following questions to test your knowledge of the information in Lesson 4, Writing Dynamic Code. The questions are also available on the companion CD if you prefer to review them in electronic form.
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NOTE Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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Lesson 4: Writing Dynamic Code
1. What method of the MethodBase class allows for synchronous execution of a method with two parameters and returns a Boolean value A.
' VB method.Invoke(returnValue, param1, param2) // C# method.Invoke(ref returnValue, param1, param2);
' VB Dim result As Boolean = CType(method.Invoke(param1, param2),Boolean) // C# bool result = (bool)method.Invoke(param1, param2);
' VB Dim result As Boolean = _ CType(method.Invoke(theInstance, param1, param2),Boolean) // C# bool result = (bool)method.Invoke(theInstance, param1, param2);
' VB Dim result As Boolean = CType(method.Invoke(theInstance, _ new Object() { param1, param2 }),Boolean) // C# bool result = (bool)method.Invoke(theInstance, new object[] {param1, param2});
2. Can the MethodBody class be used to invoke part of the body of a method A. Yes. B. No.
14
Reflection
Lesson 5: Creating Code at Runtime
Reflection is not limited to detecting information about assemblies and types. You can also define this information at runtime and even create your own assemblies (either for in-memory consumption or serialized to disk for reuse).
After this lesson, you will be able to:
Create a dynamic assembly. Create a dynamic module within a new assembly. Use the builder classes to build new types. Serialize a newly created assembly to disk.
Estimated lesson time: 10 minutes
Building Your Own Code
The reflection system includes a sub-namespace called Emit (System.Reflection.Emit) that contains a set of builder classes that are used to build assemblies, types, methods, and so on. To build code at runtime, you have to encapsulate it like any other code. (Create an assembly, then a module within the assembly, and finally types within the module.) Each of these builder classes derives from its info class counterpart. For example, AssemblyBuilder derives from Assembly, MethodBuilder derives from MethodInfo, and TypeBuilder derives from Type. Table 14-11 lists all the builder classes and their role in creating code at runtime.
Table 14-11 Builder Classes
Name AssemblyBuilder ConstructorBuilder EnumBuilder EventBulder FieldBuilder LocalBuilder MethodBuilder
Description Used to build assemblies at runtime Used to build constructors at runtime Used to build enumerations at runtime Used to build events at runtime Used to build fields at runtime Used to build local variables for methods and constructors Used to build methods at runtime
Lesson 5: Creating Code at Runtime
Table 14-11 Builder Classes
Name ModuleBuilder ParameterBuilder PropertyBuilder TypeBuilder
Description Used to build modules at runtime Used to build method parameters at runtime Used to build properties at runtime Used to build types at runtime
Creating an Assembly and Module
Before you can define any types, you need to create an assembly and module. To do this, you need to ask an AppDomain to create a dynamic assembly. The AppDomain class has a DefineDynamicAssembly method that takes an AssemblyName parameter and an AssemblyBuilderAccess parameter. The AssemblyName object contains each part of the full assembly name. The only required part of the assembly name you need in this case is the simple name. You can construct an AssemblyName object like so:
' VB Dim tempName As New AssemblyName() tempName.Name = "MyTempAssembly" // C# AssemblyName tempName = new AssemblyName(); tempName.Name = "MyTempAssembly";
The AssemblyBuilderAccess specifies what you can do with the new dynamic assembly. You can specify ReflectionOnly, Run, Save, or RunAndSave, depending on what you intend to do with the new assembly. With these two pieces of information, you can now create your dynamic assembly by calling your current AppDomain s DefineDynamicAssembly method:
' VB Dim assemBldr As AssemblyBuilder = _ AppDomain.CurrentDomain.DefineDynamicAssembly(tempName, _ AssemblyBuilderAccess.RunAndSave) // C# AssemblyBuilder assemBldr = AppDomain.CurrentDomain.DefineDynamicAssembly(tempName, AssemblyBuilderAccess.RunAndSave);
Now that you have an AssemblyBuilder object, you can create a ModuleBuilder so that you can start creating type information. This is done by simply specifying a name and
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