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    <p>Here's an example of creating a class at runtime that contains a single integer property <code>Id</code> which is virtual:</p> <pre><code>class Program { static void Main(string[] args) { var aName = new AssemblyName("DynamicAssemblyExample"); var ab = AppDomain.CurrentDomain.DefineDynamicAssembly(aName, AssemblyBuilderAccess.Run); var mb = ab.DefineDynamicModule(aName.Name); var tb = mb.DefineType("MyDynamicType", TypeAttributes.Public); var fbId = tb.DefineField("_id", typeof(int), FieldAttributes.Private); var pbId = tb.DefineProperty("Id", PropertyAttributes.HasDefault, typeof(int), null); var getSetAttr = MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig | MethodAttributes.Virtual; var mbIdGetAccessor = tb.DefineMethod("get_Id", getSetAttr, typeof(int), Type.EmptyTypes); var numberGetIL = mbIdGetAccessor.GetILGenerator(); numberGetIL.Emit(OpCodes.Ldarg_0); numberGetIL.Emit(OpCodes.Ldfld, fbId); numberGetIL.Emit(OpCodes.Ret); var mbIdSetAccessor = tb.DefineMethod("set_Id", getSetAttr, null, new Type[] { typeof(int) }); var numberSetIL = mbIdSetAccessor.GetILGenerator(); numberSetIL.Emit(OpCodes.Ldarg_0); numberSetIL.Emit(OpCodes.Ldarg_1); numberSetIL.Emit(OpCodes.Stfld, fbId); numberSetIL.Emit(OpCodes.Ret); pbId.SetGetMethod(mbIdGetAccessor); pbId.SetSetMethod(mbIdSetAccessor); var t = tb.CreateType(); var instance = Activator.CreateInstance(t); Console.WriteLine(t.GetProperty("Id").GetGetMethod().IsVirtual); } } </code></pre> <p>The reason you don't find anything related to <code>virtual</code> in the <code>PropertyBuilder</code> is because properties don't have this concept. Methods can be virtual, so when you declare a <em>virtual property</em> you are declaring virtual getter and setter methods. Take a look at <a href="http://msdn.microsoft.com/en-us/library/system.reflection.methodattributes.aspx" rel="nofollow noreferrer">MethodAttributes</a> enumeration.</p>
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    1. POHow can I generate Virtual Properties with the AssemblyBuilder in C# 4.0?
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    1. USDarin Dimitrov
    1. USDarin Dimitrov
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    1. POHow can I generate Virtual Properties with the AssemblyBuilder in C# 4.0?
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    1. COab.Save() doesn't save your created Assembly (even with the AssemblyBuilderAccess set to RunAndSave) Can you try saving and loading the assembly back into memory? I use this in my own software to work around a bug in the .NET framework that defines the assembly as a runtime assembly even after it has been saved. But if i use this on your code, it doesn't save any property or method.
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      1. USThijs Cramer
    2. COApperently i did something wrong with your code that stopped it from working. After retrying, it works fine!
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    3. CO@ThijsCramer if you pass a filename to the DefineDynamicModule method, the file will be saved when you use ab.Save(FileName) later on. I don't know if it is a bug or a feature, because you need to specify the filenames at both places and both can be different. The assembly dll will refer to the module dll
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      1. USSurya Pratap
 

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