set class name and object name at run time

Question

How do I specify the object name and class name that is to be created at runtime ?

Vulpes · Answer

Well, it sounds like the Assembly.GetType method is not able to find a type with the name 'NameOfSpace'. I can't tell from the code exactly what this variable represents but the most likely reasons for the error are: 1. That it's not a 'fully qualified' typename i.e. projectName doesn't represent a namespace or FormName doesn't represent a type. 2. There's a difference in capitalization between the actual type and the variable.

Mehrdad Abdolahi · Answer

"TypeForm" always is NULL!!! why?? I could not use from that code please help me

Mehrdad Abdolahi · Answer

no, i want use from this code: private void btnCustomers_Click(object sender, EventArgs e) { Button btn = new Button(); btn = (Button)sender; MessageBox.Show(btn.Name); StringBuilder EntityName = new StringBuilder(); EntityName.Append(btn.Name); EntityName.Remove(0, 3); string projectName = "AAShS_Forms_" + EntityName.ToString(); StringBuilder FormName = new StringBuilder(); FormName.Append("F_C_"); FormName.Append(EntityName.ToString()); String NameOfSpace = projectName + "." + FormName.ToString(); object ObjForm = new object(); ** Type TypeForm= System.Reflection.Assembly.GetExecutingAssembly().GetType(NameOfSpace ); if (TypeForm != null) { ObjForm = Activator.CreateInstance(TypeForm); ((Form)ObjForm).ShowDialog(); } } ......... but I don't know why answer is Null in (**line) (TypeForm)?!

Vulpes · Answer

If you're talking here about creating a 'named' class at runtime rather than compile time, then you can do so using 'reflection emit'. However, this is quite complicated and requires a knowledge of MSIL opcodes so it's not something which is done very often in practice. Check out this article for details: http://www.c-sharpcorner.com/uploadfile/puranindia/reflection-and-reflection-emit-in-C-Sharp/