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Lesson 3: Reflecting Types
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10. Continue inside the iteration loop, and get all the members from each type using the BindingFlag variable from step 4. 11. Iterate through each member that you returned, and show the MemberType and the name of the member in the console window. Your code might look something like this:
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' VB Imports System.Reflection Class Program Public Overloads Shared Sub Main() Dim path As String = _ "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\" + _ "System.ServiceProcess.dll" ' Using BindingFlags to only get declared and instance members Dim flags As BindingFlags = _ BindingFlags.DeclaredOnly Or _ BindingFlags.Public Or _ BindingFlags.Instance ' Load the Assembly from the path Dim theAssembly As Assembly = Assembly.LoadFrom(path) Console.WriteLine(theAssembly.FullName) Dim types() As Type = theAssembly.GetTypes For Each t As Type In types Console.WriteLine(" Type: {0}", t.Name) Dim members() As MemberInfo = t.GetMembers(flags) For Each member As MemberInfo In members Console.WriteLine(" {0}: {1}", member.MemberType, _ member.Name) Next Next Console.Read() End Sub End Class // C# using System.Reflection; class Program { static void Main(string[] args) { string path = @"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\" + "System.ServiceProcess.dll";
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Reflection
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// Using BindingFlags to only get declared and instance members BindingFlags flags = BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.Instance; // Load the Assembly from the path Assembly theAssembly = Assembly.LoadFrom(path); Console.WriteLine(theAssembly.FullName); Type[] types = theAssembly.GetTypes(); foreach (Type t in types) { Console.WriteLine(" Type: {0}", t.Name); MemberInfo[] members = t.GetMembers(flags); foreach (MemberInfo member in members) { Console.WriteLine(" {0}: {1}", member.MemberType, member.Name); } } Console.Read(); } }
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12. Build the project, and resolve any errors. Verify that the console application successfully shows all the types in a specified assembly.
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To access type information directly from any object, call the GetType method of the Object class. To enumerate type members, including methods, properties, fields, events, and enumerations, use the MemberInfo and MemberInfoCollection classes. To enumerate all the types in a particular assembly, call the GetTypes method of the Assembly class. To have more control over what members to retrieve from a Type, use the BindingFlags enumeration.
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Lesson 3: Reflecting Types
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Lesson Review
You can use the following questions to test your knowledge of the information in Lesson 3, Reflecting Types. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE Answers
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.
1. What types of objects derive from the MemberInfo class (Choose all that apply.) A. FieldInfo class B. MethodInfo class C. Assembly class D. Type class 2. What values of the BindingFlags enumeration do you need to specify when searching for public instance members directly on a type (not inherited methods) (Choose all that apply.) A. BindingFlags.Public B. BindingFlags.Static C. BindingFlags.DeclaredOnly D. BindingFlags.Instance
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Reflection
Lesson 4: Writing Dynamic Code
Up to now, you have been looking at type information in an assembly and reporting it to users. At times, you will want to be able to run code in those assemblies. And there are times when you do not have access to code during compile time. Being able to dynamically load an assembly and run code in that assembly without early access to the code is the goal of dynamic code.
After this lesson, you will be able to:
Use the ConstructorInfo class to create a new instance of a type. Use the info classes to execute arbitrary code. Call static methods and properties.
Estimated lesson time: 15 minutes
Using Dynamic Code
The reflection system allows you to create objects dynamically, even from assemblies you have not referenced ahead of time. Although this is more difficult than writing type-safe compiler-checked code, at times it is necessary. When you create an object with standard code, how do you do it You use the constructor. For example, consider the following simple code that creates a Hashtable, adds an element, and returns the count:
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