How can Create two nested class in runtime

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Hi guys

i have a xml file with this structure

XML

<graph>
    <id>0</id>
    <name>John</name>
    <link>http://test.com</link>
</graph>
<graph>
    <id>1</id>
    <name>Roger</name>
    <link>http://test2.com</link>
</graph>

i want use Reflection.Emit class for create two class
first:

C#

class A {
     int id;
     string name;
     string link
}

second:

C#

Class B{
      List<A> graphs;
}

i read this paper (Introduction to Creating Dynamic Types with Reflection.Emit[^])and can create class A in runtime but the problem is using this (A) in another runtime class(B) and also have a List of A.

C#

MyClassBuilder MCB=new MyClassBuilder("A");
var myclass = MCB.CreateObject(new string[3] { "id", "name", "link" }, new Type[3] { typeof(int), typeof(string), typeof(string) });
Type TP = myclass.GetType();
MyClassBuilder MCB1=new MyClassBuilder("B");
//Here is my confusion typeof(List<TP>) ?????? Error Ocurred
var myclass2 = MCB1.CreateObject(new string[1] {"graphs"}, new Type[1] {typeof(List<TP>)});
//set value of class A and work
object tp = Activator.CreateInstance(TP);
TP.GetProperty("id").SetValue(tp,0);
TP.GetProperty("name").SetValue(tp,"Joh");
TP.GetProperty("link").SetValue(tp,"http://test.com");

//set value of class B ??????
//add tp in graphs

Posted 15-May-15 0:17am

eagers

Updated 15-May-15 1:02am

v3

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Comments

Sascha Lefèvre 15-May-15 6:35am

Have you tried it?

eagers 15-May-15 6:51am

i only can create the class A, after that i dont know how can graphs.SetValue of the secound class and how generate a type of a not existence Type.

in the paper all Type are int, string and all of them is exist! but in my problem want create Class B that have a property of Type A, is not exist.

eagers 15-May-15 6:59am

MyClassBuilder MCB=new MyClassBuilder("A");
var myclass = MCB.CreateObject(new string[3] { "id", "name", "link" }, new Type[3] { typeof(int), typeof(string), typeof(string) });
Type TP = myclass.GetType();
MyClassBuilder MCB1=new MyClassBuilder("B");
//Here is my confusion typeof(List<tp>) ??????
var myclass2 = MCB1.CreateObject(new string[1] {"graphs"}, new Type[1] {typeof(List<>)});
//set value of class A and work
object tp = Activator.CreateInstance(TP);
TP.GetProperty("id").SetValue(tp,0);
TP.GetProperty("name").SetValue(tp,"Joh");
TP.GetProperty("link").SetValue(tp,"http://test.com");

//set value of class B ??????
//add tp in graphs

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Richard Deeming · Accepted Answer · 2015-05-15T01:59:00

To construct a generic type with dynamic type parameters, you need to start with the generic type definition, and call MakeGenericType[^]:

C#

Type myclassType = myclass.GetType();
Type listOfMyClass = typeof(List<>).MakeGenericType(myclassType);
var myclass2 = MCB1.CreateObject(new string[] { "graphs" }, new Type[] { listOfMyClass });

To create an instance of the list and add objects to it, use the non-generic IList interface:

C#

// Create a new List<A>:
var graphs = (IList)Activator.CreateInstance(listOfMyClass);

// Create a new instance of "B", and set the property:
Type myclass2Type = myclass2.GetType();
object b = Activator.CreateInstance(myclass2Type);
myclass2Type.GetProperty("graphs").SetValue(b, graphs);

// Create a new instance of "A" and intialize its properties:
object a = Activator.CreateInstance(myclassType);
myclassType.GetProperty("id").SetValue(a, 0);
myclassType.GetProperty("name").SetValue(a, "Joh");
myclassType.GetProperty("link").SetValue(a, "http://test.com");

// Add the item to the list:
graphs.Add(a);