qr code generator asp net c# Understanding the MethodBody in Visual C#.NET

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Understanding the MethodBody
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Iterating through the type information as you have done will allow you to look at the structure of a type, but it won t necessarily allow you to look at the code the type contains. This is where the MethodBody object comes in to play. The MethodBody is a special sort of container that contains local variables and the actual Intermediate Language (IL) instructions that are compiled into machine code at runtime. You get
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Reflection
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the MethodBody by using the GetMethodBody call on a MethodBase instance (ConstructorInfo or MethodInfo class):
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' VB Dim body As MethodBody = meth.GetMethodBody() // C# MethodBody body = meth.GetMethodBody();
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Once you have an instance of the MethodBody class, you can get the local variables and the stack size, like so:
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' VB Console.WriteLine(" MaxStack: {0}", body.MaxStackSize) For Each local As LocalVariableInfo In body.LocalVariables Console.WriteLine("Local Var ({0}): {1}", _ local.LocalType, local.LocalIndex) Next // C# Console.WriteLine(" MaxStack: {0}", body.MaxStackSize); foreach (LocalVariableInfo local in body.LocalVariables) { Console.WriteLine("Local Var ({0}): {1}", local.LocalType, local.LocalIndex); }
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The local variables return as an array of LocalVariableInfo objects that contain information about the type of each variable. The name of the variable is not available because the metadata about a type doesn t keep the name of the variable, only its order. Finally, you can get at an array of bytes that is the actual IL code that the CLR uses to compile and run as machine code. The IL is returned as an array of bytes, as shown in the following example:
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' VB For Each b As Byte In body.GetILAsByteArray() Console.Write("{0:x2} ", b) Next // C# foreach (Byte b in body.GetILAsByteArray()) { Console.Write("{0:x2} ", b); }
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MORE INFO
Intermediate Language
The structure of what IL is and what IL is composed of is an advanced subject that is not covered in this book. Please refer to the MSDN Web site for good sources of information about IL.
Lesson 3: Reflecting Types
Using the BindingFlags
The BindingFlags enumeration is used to control how members of a type are retrieved using the GetMembers methods (as well as the specific methods for each member type). The BindingFlags enumeration is a flagged enumeration, which means that more than one value can be used. Table 14-10 details each member of the BindingFlags enumeration that is used when enumerating members and explains what each value means.
Table 14-10 BindingFlags Enumeration
Name DeclaredOnly Default FlattenHierarchy IgnoreCase Instance NonPublic Public Static
Description Members directly declared on the specific type are included. Inherited members are ignored. No binding flag is used. Declared and inherited members should be returned, but also returns protected members. A case-insensitive matching of the member name should be used. Members that are part of an instance of type will be included. Members that are not public (protected, internal or friend in Visual Basic and private) are included. Members that are public are included. Members that are defined as static are included.
To use the BindingFlags, you combine multiple flags to determine what members you are trying to access. For example, to get all members (public and nonpublic) of a type but limited to only instance members, you would do the following:
' VB Dim t As Type = GetType(String) ' Specify public and non-public, but only instance members Dim flags As BindingFlags = _ BindingFlags.Public Or BindingFlags.NonPublic Or BindingFlags.Instance
14
Reflection
' Use the flag to get the members Dim members() As MemberInfo = t.GetMembers(flags) For Each member as MemberInfo In members Console.WriteLine("Member: {0}", member.Name) Next // C# Type t = typeof(String); // Specify public and non-public, but only instance members BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance; // Use the flag to get the members MemberInfo[] members = t.GetMembers(flags); foreach (MemberInfo member in members) { Console.WriteLine("Member: {0}", member.Name); }
Lab: Load an Assembly, and Dump Its Type Information
In this lab, you create a console application to load an assembly and show all the type information. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder. 1. Create a new console application, and call it AssemblyDemo. 2. Add an include statement (or Imports in Visual Basic) to the System.Reflection namespace to the main code file. 3. In the main method body, create a local string that contains the path to a wellknown assembly. The System.ServiceProcess assembly in the .NET Framework is a small assembly and works well with this project. 4. Create a local BindingFlag variable, and store the flags to get only declared, public instance members. 5. Create a new instance of the Assembly class by loading the assembly that the local string points to from step 3. 6. Write out the Assembly s full name to the console. 7. Next, get all the types from the assembly object you created in step 5. 8. Iterate through all the types that were returned. 9. Inside the iteration loop, write out the name of the type to the console.
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