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Can you save a type created with TypeBuilder?

I'm having difficulty with creating dynamic types, TypeBuilder is attained through module builder which in turn comes from assembly builder. I assumed that if you save the assembly you'd save the type (made with the typebuilder) as well. When I save and load the assembly it comes back as having no types
Is there a certain set of rules the type or assembly must comply to for it to be valid
If so, what might those rules be

I greatly appreciate any assistance on the matter

Nov 15 '05 #1
2 3223
Jax <an*******@disc ussions.microso ft.com> wrote:
I'm having difficulty with creating dynamic types, TypeBuilder is
attained through module builder which in turn comes from assembly
builder. I assumed that if you save the assembly you'd save the type
(made with the typebuilder) as well. When I save and load the assembly
it comes back as having no types. Is there a certain set of rules the type or assembly must comply to
for it to be valid? If so, what might those rules be?

It should be fine, so long as you've called TypeBuilder.Cre ateType.
Could you post a short but complete example of the problem?

Jon Skeet - <sk***@pobox.co m>
If replying to the group, please do not mail me too
Nov 15 '05 #2
Thanks for replying Jon

Creating a type from a form
The form returns to this method an arraylist of TypeObjects the object contains 2 strings, name and type. example: "Width" "System.Int 32
I try to match the types at the end and my messageboxes tell me the results
The first messageBox matches fine
Then I save and load the assembly and attempt a further match, this one is always false, in debugger the loaded assembly has no types

AssemblyName an = new AssemblyName()
an.Name = "myAssembly "
AppDomain currentDomain = AppDomain.Curre ntDomain
AssemblyBuilder ab = currentDomain.D efineDynamicAss embly(an, AssemblyBuilder Access.RunAndSa ve)
ModuleBuilder mb = ab.DefineDynami cModule("myModu le")
TypeBuilder tBuild = mb.DefineType(" myType", TypeAttributes. Public)
foreach(TypeObj ect to in alTypeObjects

tBuild.DefineFi eld(to.name, System.Type.Get Type(to.type),F ieldAttributes. Private)
System.Type[] types = new System.Type[1]
types[0] = System.Type.Get Type(to.type)
tBuild.DefinePr operty(to.type. ToUpper(), PropertyAttribu tes.HasDefault, System.Type.Get Type(to.type), types);
Type theType = tBuild.CreateTy pe()
object o = Activator.Creat eInstance(theTy pe)

Type aType = mb.GetType("myT ype")
if(aType == theType
MessageBox.Show ("Type match")
ab.Save("myasse mbly.dll")
Assembly a = Assembly.LoadFr om("myassembly. dll")
aType = a.GetType("myTy pe")
if(aType == theType
MessageBox.Show ("Type match")
{MessageBox.Sho w("2nd match not found");}
Nov 15 '05 #3

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