Visual Studio; MSDN subscription access. 59e140eb44d5/net-framework-error-common-language-runtime-detected-invalid-program?forum=clr Question 3 8/5/2010 2:17:50. Unexpected common language runtime. You should see a similar error if you run any Automation-aware or COM-aware program, such as Microsoft Visual Studio. Common Language Runtime detected an invalid program. Common Language Runtime detected an invalid program. Using Visual Studio 2010 and VS2012 is not installed. Visual Studio 2010 Release Candidate Readme. 2.1.2 Visual Studio Setup cannot be run in Program Compatibility Mode. Behavior reproduces with.NET Framework 4.0 and Visual Studio 2010 while with the same.NET 4.0 and VS 2012 item does not reproduce. Dynamic Type Using Reflection. Emit - Code. Project. In this article, I have provided sample codes to ensure you could build your own Dynamic Type easily using Reflection. Emit classes. Table of Contents. Hi Folks, Its long since I am writing this for you. I have been writing technical blogs though. Finally thought. of starting one. After putting my efforts with Reflection classes, I thought I could make some research. I took the Code. Dom being the best alternative to generate code. So rather than Code. Dom, I thought there must be something else which. Next I found out one, using Expression Trees. If you are already following me, I think you.
I have already written about Expression Trees and Lamda Decomposition. Later on, I did some research on MSIL, and found. If you are going to grow with . NET, it would be your added advantage if you. MSIL. Hence I started looking at the MSIL. Finally I found out a number of classes. Type dynamically. Let me share the entire thing with you. Reflection. Emit like Code. Dom allows you to build your custom assembly and provides you a. Builder classes which might be compiled during Runtime, and hence invoke DLR. C#. The library also exposes one ILGenerator which might be used later to. MSIL by putting efforts to emit Operation codes. ![]() Reflection is actually a technique to read a. In that case, you have two options. You refer to the assembly directly and call its methods. You use Reflection to load the assembly and call it using interfaces. If you want to build really a decoupled architecture for your application, something like. Believe me, there is no other alternative. Reflection. Reflection classes allows you to load an external assembly to your. To know more try Reflection Overview. As I have already told you, Reflection. Emit actually provides. Builder classes like. Assembly. Builder, Module. Builder, Constructor. Builder, Method. Builder. Event. Builder, Property. Builder. etc. Generally, it is very rare that a developer need these capabilities to generate an. Now lets see what is required to build an assembly. Now lets jump back to identify the steps to create the assembly : Create an Assembly in an Application Domain. Assembly. Builder will help you in that. Create a Module inside the Assembly. Create a number of Type inside a Module. Add Properties, Methods, Events etc inside the Type. Use ILGenerator to write inside the Properties, Methods etc. Basically these are the common steps to create your own dynamically created Assembly. From the above figure, you can clear how the entire structure of an CLR assembly goes. Each type might. contain its members, and each member Method or Properties can have its OPCodes, Locals. Parameters. Locals define the local variables you define inside a method body and Op. Codes. are the instruction codes for the IL. Now lets go step by step with IL to build one dynamic assembly yourself. Assembly. Builder Get. Assembly. Builder(string assembly. Name). . I have used Assembly. Name class to name the assembly for us. App. Domain. is the place where the Assembly will be created. This is very important, as application mght. To make it more simplistic, rather than creating. App. Domain, I am using Current. Domain where the program is running. Finally I have created. Assembly. Builder, which eventually builds up the Assembly with unique name aname. As I did, if you use. Run, that means the assembly could only be run dynamically using Reflection, it cannot be saved. Browse through each of the values to see the output. Note : If you have defined a custom attribute for the assembly, you can easily go for. Set. Custom. Attriburte to add your custom attribute to the assembly. Assembly. Builder allows you to define a number of features like : Add. Resource. File : Allows you to specify a file to be added as resource to the assembly. Define. Unmanaged. Resource / Define. Resource : Adds one Unmanaged Resource for the assembly Entry. Point/Set. Entry. Point : A special subroutine / method to be defined which will be called automatically when the Assembly is invoked. Set. Custom. Attribute : Lets you specify Attributes for the assembly. Define. Dynamic. Module : Defines the Module for the assembly where the actual code will contain. There are lot more flexibility while building the assembly. A module is container for all the classes we place therein. Let us create a module for us. Define. Type : Lets you to define a type / class. Define. Manifest. Resource : A dll contains a binary manifest. This method lets you define the manifest for you. Define. PInvoke. Method : Allows you to define a PInvoke method (COM) for the assembly. This is the main thing. To create a class, structure, delegate etc you need to define a. Type. Builder. As you can see the first one is simple one. I have just specified the name of the class and the Module. Builder and the method. Type. Builder. In the second overload, I have put an additional param array of string. Generic type for the class. Generic. Type. Parameter. Builder. allows you to define the Generic. Type. Parameter. Once you define the Generic. Type. Parameters. Compared to classes, Type. Builder allows you to define full fledged structure with all the options you have. Some of them are : Define. Field / Define. Method / Define. Properties / Define. Event : You might use these methods to generate class members. Define. Method. Override : Allows you to override an existing method when the Type is inherited from another base type. Define. Constructor / Define. Default. Constructor : Specifies the constructor for the current type. Add. Interface. Implementation : Allows you to implement the current type from another interface. Method are the building block of any program. We will define a number of Methods to. IL. For the time being. Method. Builder. public Method. Builder Get. Method(Type. Builder typ. Builder, string method. Name). . The overloads allows you to put. Generic Type parameters for the methods. Now, after building your type you need to create Locals (local variables) and use Op. Code. instructions. To define your Op. Codes you will need ILGenerator. ILGenerator allows you to Emit IL for your method body and hence lets you. Let me first introduce some of. Create. Method(). The class hence created will contain the method Sum in it. Every method must declare local stack element to run its data. In IL, we declare Local variables before calling any instruction codes. Just like this, I have used Declare. Local to declare a float. Local in the method. The Declare. Local method actually returns a Local. Builder which you might use as well to manipulate the index of this variable. After we declare all the locals, we first. Ldarg. Now here is the most easiest sample of producing your own Type. Now let me go a bit further. Type. As we have already built our own Type, its time to give you an example in building a more. Type. Before we demonstrate let me show you the code which we are going to create. Please note that. I have tried to simplify the code in an extent so that it helps you to understand the code better. IBuilder. . The class contains few methods, events. After you see the code lets open ILDASM and see how the IL looks like the picture above. Basically it contains two type . IBuilder. class for Builder implementing IBuilder. Other than that you will see another type for the Main method. Type. To build a dynamic type, the most important thing that we have discussed already are Builder classes. The BCL exposes a number of. Builder classes that enables us to generate MSIL code dynamically during runtime and hence you. From the above figure I have put some of the most important Builder classes marked in Red. But ultimately, you need instructions to run for your application. ILGenerator. (marked in blue) enables you to write your IL for a method or property. Op. Codes are Operation. Computer instructions. So while writing your instructions you need to pass. Op. Codes and generate the instruction set for the Method. Now going further with our example, let me demonstrate the code one by one so that you could easily build your own Code generator. As per our discussion, IBuilder contains 4 members, Sum, Divide, Multiply & substract. After I build and Open ILDASM to disassemble my assembly the IL it produces looks like. Emit. Method. Sample. IBuilder. . In MSIL any type is defined with . Type IBuilder gets one . Type to be abstract and hence you cannot create object of the same. Ansi specifies the LPSTR(Long Pointer to String) interpreted as ANSI. Methods in IBuilder is identified using . Because of being member of an interface, the methods appear as abstract virtual. Any normal method you define gets this flexibility in . NET. New. Slot makes the member to get a slot in vtable. So whenever an object is created, a vtable is created each for each object and any object created within it gets an entry of vtable. The first member being the hidden pointer can be used to find members of the vtable)cil managed is used to determine that the method is implemented in managed environment. Now as you now understand the IL generated by the Interface, its time to get through to create the Type IBuilder. Lets build the code. Type Create. IBuilder(Module. Builder mbuilder). The Define. Method method. Method. Attributes correctly. We also need to mention. Return. Type and argument types specifically. In this case I have specified the. Return. Type as System. Single(float) and arguments as integers for our code. Hmm, now its time to go final workaround with this. First I will create the basic class. IBuilder, later on we will add the. But as our constructor also adds few lines to initialize properties First. Num and Second. Num, let me define them first. In terms of IL, as in ILDASM it looks like. Emit. Method. Sample. Builder. extends . If you focus on the code, you will see I have specified Before. Field. Init. for the type, which means you can call the static members without initializing the object. As shown in the. Builder Type we have two fields to store numeric values each of which is wrapped around using.
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