AppDomain.DefineDynamicAssembly Method (AssemblyName, AssemblyBuilderAccess, String)
Defines a dynamic assembly using the specified name, access mode, and storage directory.
Assembly: mscorlib (in mscorlib.dll)
public AssemblyBuilder DefineDynamicAssembly( AssemblyName name, AssemblyBuilderAccess access, string dir )
Parameters
- name
-
Type:
System.Reflection.AssemblyName
The unique identity of the dynamic assembly.
- access
-
Type:
System.Reflection.Emit.AssemblyBuilderAccess
The mode in which the dynamic assembly will be accessed.
- dir
-
Type:
System.String
The name of the directory where the assembly will be saved. If dir is null, the directory defaults to the current directory.
Return Value
Type: System.Reflection.Emit.AssemblyBuilderA dynamic assembly with the specified name and features.
| Exception | Condition |
|---|---|
| ArgumentNullException | name is null. |
| ArgumentException | The Name property of name is null. -or- The Name property of name begins with white space, or contains a forward or backward slash. |
| AppDomainUnloadedException | The operation is attempted on an unloaded application domain. |
This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName) method overload.
Note |
|---|
During the development of code that emits dynamic assemblies, it is recommended that you use an overload of the DefineDynamicAssembly method that specifies evidence and permissions, supply the evidence you want the dynamic assembly to have, and include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust. |
The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.
For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.
using System; using System.Reflection; using System.Reflection.Emit; class Test { public static void Main() { AppDomain currentDomain = AppDomain.CurrentDomain; InstantiateMyDynamicType(currentDomain); // Failed! currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler); InstantiateMyDynamicType(currentDomain); // OK! } static void InstantiateMyDynamicType(AppDomain domain) { try { // You must supply a valid fully qualified assembly name here. domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType"); } catch (Exception e) { Console.WriteLine(e.Message); } } static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) { return DefineDynamicAssembly((AppDomain) sender); } static Assembly DefineDynamicAssembly(AppDomain domain) { // Build a dynamic assembly using Reflection Emit API. AssemblyName assemblyName = new AssemblyName(); assemblyName.Name = "MyDynamicAssembly"; AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule"); TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public); ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null); ILGenerator ilGenerator = constructorBuilder.GetILGenerator(); ilGenerator.EmitWriteLine("MyDynamicType instantiated!"); ilGenerator.Emit(OpCodes.Ret); typeBuilder.CreateType(); return assemblyBuilder; } }
Available since 1.1
