Pass param to an invoked method

[John F]

Hello,

I'm dynamically loading a child form saved in a DLL. I have this code
working and it's pretty straightforward .

What I'd like to do is pass an object type to an invoked method in the child
form as soon as it's loaded. It seems I can get the invoke working just
fine, but I can't get the object successfully cast inside the invoked method.

Thanks in advance,
John F.

Here is my code:
// Calling code from within my MDI app
---------------------------------------------------
// Global Member
ArrayList colAvailableFor ms;

private void btnLoad_Click(o bject sender, System.EventArg s e)
{
DynamicFormClas s objFormToLoad = colAvailableFor ms[0] as DynamicFormClas s;

Assembly assem = Assembly.LoadFr om(objFormToLoa d.Location);

Type[] types = assem.GetTypes( );

Object genericInstance = assem.CreateIns tance(types[0].FullName);

Form tmpForm = genericInstance as Form;
tmpForm.MdiPare nt=this;
tmpForm.Show();

// array with one member
Type[] paramTypes = new Type[1];

paramTypes[0]= Type.GetType("S ystem.Object");

// Get method info for passParams()
MethodInfo passParam = types[0].GetMethod("pas sParams",paramT ypes);

// fill an array with the actual parameters
Object[] parameters = new Object[1];

parameters[0] = colAvailableFor ms[0];

try
{
Object returnVal = passParam.Invok e(null,paramete rs);
}
catch(Exception ex)
{
MessageBox.Show (ex.ToString()) ;
}
}

private void Form1_Load(obje ct sender, System.EventArg s e)
{
this.colAvailab leForms = new ArrayList();
Object objNewForm = new DynamicFormClas s("c:\\testform .dll","Descript ion");
colAvailableFor ms.Add(objNewFo rm);
}
// Child form. Code inside of testform.dll
------------------------------------------
static public void passParams(Obje ct objTemp)
{
//I've tried this and get an exception.
//DynamicLoadMDI. DynamicFormClas s objFormToLoad =
(DynamicLoadMDI .DynamicFormCla ss) objTemp;

// Produces null.
DynamicLoadMDI. DynamicFormClas s objFormToLoad = objTemp as
DynamicLoadMDI. DynamicFormClas s;

MessageBox.Show (objFormToLoad. Location.ToStri ng());
}
// DynamicFormClas s that's defined in both MDI and DLL.
-------------------------------------------------------
namespace DynamicLoadMDI
{
public class DynamicFormClas s
{
private string _strLocation;
private string _strDescription ;

public DynamicFormClas s(string strLocation, string strDescription)
{
this._strLocati on = strLocation;
this._strDescri ption = strDescription;
}

public string Location
{
get {return _strLocation;}
set {_strLocation = value;}
}

public string Description
{
get {return _strDescription ;}
set {_strDescriptio n = value;}
}
}
}

[Nicholas Paldino [.NET/C# MVP]]

John,

Why not have your form implement an interface and then cast that
instance to that interface? Then, you can call methods normally, and not
have to worry about all of the reflection.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"John F" <[e-mail]> wrote in message
news:4C******** *************** ***********@mic rosoft.com...

Hello,

I'm dynamically loading a child form saved in a DLL. I have this code
working and it's pretty straightforward .

What I'd like to do is pass an object type to an invoked method in the
child
form as soon as it's loaded. It seems I can get the invoke working just
fine, but I can't get the object successfully cast inside the invoked
method.

Thanks in advance,
John F.

Here is my code:
// Calling code from within my MDI app
---------------------------------------------------
// Global Member
ArrayList colAvailableFor ms;

private void btnLoad_Click(o bject sender, System.EventArg s e)
{
DynamicFormClas s objFormToLoad = colAvailableFor ms[0] as
DynamicFormClas s;

Assembly assem = Assembly.LoadFr om(objFormToLoa d.Location);

Type[] types = assem.GetTypes( );

Object genericInstance = assem.CreateIns tance(types[0].FullName);

Form tmpForm = genericInstance as Form;
tmpForm.MdiPare nt=this;
tmpForm.Show();

// array with one member
Type[] paramTypes = new Type[1];

paramTypes[0]= Type.GetType("S ystem.Object");

// Get method info for passParams()
MethodInfo passParam = types[0].GetMethod("pas sParams",paramT ypes);

// fill an array with the actual parameters
Object[] parameters = new Object[1];

parameters[0] = colAvailableFor ms[0];

try
{
Object returnVal = passParam.Invok e(null,paramete rs);
}
catch(Exception ex)
{
MessageBox.Show (ex.ToString()) ;
}
}

private void Form1_Load(obje ct sender, System.EventArg s e)
{
this.colAvailab leForms = new ArrayList();
Object objNewForm = new
DynamicFormClas s("c:\\testform .dll","Descript ion");
colAvailableFor ms.Add(objNewFo rm);
}
// Child form. Code inside of testform.dll
------------------------------------------
static public void passParams(Obje ct objTemp)
{
//I've tried this and get an exception.
//DynamicLoadMDI. DynamicFormClas s objFormToLoad =
(DynamicLoadMDI .DynamicFormCla ss) objTemp;

// Produces null.
DynamicLoadMDI. DynamicFormClas s objFormToLoad = objTemp as
DynamicLoadMDI. DynamicFormClas s;

MessageBox.Show (objFormToLoad. Location.ToStri ng());
}
// DynamicFormClas s that's defined in both MDI and DLL.
-------------------------------------------------------
namespace DynamicLoadMDI
{
public class DynamicFormClas s
{
private string _strLocation;
private string _strDescription ;

public DynamicFormClas s(string strLocation, string strDescription)
{
this._strLocati on = strLocation;
this._strDescri ption = strDescription;
}

public string Location
{
get {return _strLocation;}
set {_strLocation = value;}
}

public string Description
{
get {return _strDescription ;}
set {_strDescriptio n = value;}
}
}
}