Runtime form Object Reference

vaibhavnvag

I want to display a form, which(name of form) is stored into a table.After firing query to that table I am getting appropriate value (e.g "frmSTART") into a string variable(myfrm = "frmSTART"), now how can I treat a string variable value as an object? So that I can write: myfrm nSTART = new myfrm (); nSTART.Show();

Hallo

Martin 0

Hello, What you asked for is not possible! .) If you know all the possible class names during design time, you simple could make a switch case over the returned string.

string myform = actual_returned_string;

switch(myform)
{
case "test1":
{
MyTest1 t1 = new MyTest1();
break;
}

case "test2":
{
MyTest2 t1 = new MyTest2();
break;
}

default:
break;

}

.) If you have to make it more dynamic, then you have to look into reflection. Therefore you should know the namespace of youre formclasses. You could use a method like this, which returns you a Form to Show.

using System.Reflection;

public System.Windows.Forms.Form GetFormByName(string _name)
{
Type t = Type.GetType(_name);
if (t != null)
{
ConstructorInfo c = t.GetConstructor(Type.EmptyTypes);
Object o = c.Invoke(new Object[0]);
return o as System.Windows.Forms.Form;
}
else
{
return null;
}
}

And you can call it like that:

string namespace = //???
string myform = namespace+actual_returned_string;

System.Windows.Forms.Form actForm = GetFormByName(myform);

Hope it works for you! All the best, Martin

Colin Angus Mackay

I don't know why you got voted a 2 for that - I thought the reflection idea was sound.

Upcoming Scottish Developers events: * Glasgow: Tell us what you want to see in 2007 My: Website | Blog | Photos

Martin 0

Hello,

Colin Angus Mackay wrote:

I don't know why you got voted a 2 for that - I thought the reflection idea was sound.

I have also no idea! It would also be interesting for me to know way, cause I'm using reflection in my application. So thank's for youre statement! All the best, Martin

ednrgc

Probably because the answer was above the person's comprehension.

Colin Angus Mackay

ednrgc wrote:

Probably because the answer was above the person's comprehension.

If someone gave me an answer that I didn't understand then I'd follow it up with a request for clarification. Oh, Well.... :sigh:

Upcoming Scottish Developers events: * Glasgow: Tell us what you want to see in 2007 My: Website | Blog | Photos