How to dyanamically instance a class from a string containing the class name?

[Earl Teigrob]

In the exampe below, the constructor of the container class is passed the
string called "foo". Within the container class, I would like to create an
instance(s) of foo and add them to the ArrayList that is returned. (Once I
figure this out I will use reflection on the instance to do other stuff)

Anyway, How to I dyanamically create a new instance of a class from
ClassName string?

Thanks for your Help

Earl

private void Button1_Click(o bject sender, System.EventArg s e)
{
container mycontainer = new container("foo" );
ArrayList fooArrayList = mycontainer.Get ListOfObjects() ;
}

public class container
{
public string ClassName;
public container(objec t ClassName)
{
this.ClassName= ClassName;
}

public ArrayList GetListOfObject s()
{
ArrayList myArrayList = new ArrayList();
for(int i=1;i<10;i++)
{
//Convert.ToClass (ClassName) myClass = new Convert.ToClass (ClassName)
//myArrayList.Add (myClass);
}
return myArrayList;
}
}

public class foo
{
public string a="ahhhh";
public string b="bee";
public string c="see";
}
}

[Jon Skeet]

Earl Teigrob <ea******@hotma il.com> wrote:

In the exampe below, the constructor of the container class is passed the
string called "foo". Within the container class, I would like to create an
instance(s) of foo and add them to the ArrayList that is returned. (Once I
figure this out I will use reflection on the instance to do other stuff)

Anyway, How to I dyanamically create a new instance of a class from
ClassName string?

Look at Type.GetType, Assembly.GetTyp e and Activator.Creat eInstance.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Ignacio Machin]

Hi,

Try Activator.Creat eInstance( );

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Earl Teigrob" <ea******@hotma il.com> wrote in message
news:O1******** ******@tk2msftn gp13.phx.gbl...

In the exampe below, the constructor of the container class is passed the
string called "foo". Within the container class, I would like to create an
instance(s) of foo and add them to the ArrayList that is returned. (Once I
figure this out I will use reflection on the instance to do other stuff)

Anyway, How to I dyanamically create a new instance of a class from
ClassName string?

Thanks for your Help

Earl

private void Button1_Click(o bject sender, System.EventArg s e)
{
container mycontainer = new container("foo" );
ArrayList fooArrayList = mycontainer.Get ListOfObjects() ;
}

public class container
{
public string ClassName;
public container(objec t ClassName)
{
this.ClassName= ClassName;
}

public ArrayList GetListOfObject s()
{
ArrayList myArrayList = new ArrayList();
for(int i=1;i<10;i++)
{
//Convert.ToClass (ClassName) myClass = new Convert.ToClass (ClassName)
//myArrayList.Add (myClass);
}
return myArrayList;
}
}

public class foo
{
public string a="ahhhh";
public string b="bee";
public string c="see";
}
}

[Earl Teigrob]

Thanks for the replays

I have got it this far from what I have read but gettype is returning a null
value in the following code

private void Button1_Click(o bject sender, System.EventArg s e)
{
Type t = Type.GetType("f oo"); //returns a null value
object classInstance = Activator.Creat eInstance(t); //blows up because t
is null
}

public class foo
{
public string a="ahhhh";
public string b="bee";
public string c="see";
}

"Earl Teigrob" <ea******@hotma il.com> wrote in message
news:O1******** ******@tk2msftn gp13.phx.gbl...

In the exampe below, the constructor of the container class is passed the
string called "foo". Within the container class, I would like to create an
instance(s) of foo and add them to the ArrayList that is returned. (Once I
figure this out I will use reflection on the instance to do other stuff)

Anyway, How to I dyanamically create a new instance of a class from
ClassName string?

Thanks for your Help

Earl

private void Button1_Click(o bject sender, System.EventArg s e)
{
container mycontainer = new container("foo" );
ArrayList fooArrayList = mycontainer.Get ListOfObjects() ;
}

public class container
{
public string ClassName;
public container(objec t ClassName)
{
this.ClassName= ClassName;
}

public ArrayList GetListOfObject s()
{
ArrayList myArrayList = new ArrayList();
for(int i=1;i<10;i++)
{
//Convert.ToClass (ClassName) myClass = new Convert.ToClass (ClassName)
//myArrayList.Add (myClass);
}
return myArrayList;
}
}

public class foo
{
public string a="ahhhh";
public string b="bee";
public string c="see";
}
}

[Michael R]

You need to use the full name of the type: GetType("yourNa mespace.foo")

--
Michael R
cr**@tampabay.r r.com

"Earl Teigrob" <ea******@hotma il.com> wrote in message
news:O7******** *****@tk2msftng p13.phx.gbl...

Thanks for the replays

I have got it this far from what I have read but gettype is returning a null value in the following code

private void Button1_Click(o bject sender, System.EventArg s e)
{
Type t = Type.GetType("f oo"); //returns a null value
object classInstance = Activator.Creat eInstance(t); //blows up because t is null
}

public class foo
{
public string a="ahhhh";
public string b="bee";
public string c="see";
}

"Earl Teigrob" <ea******@hotma il.com> wrote in message
news:O1******** ******@tk2msftn gp13.phx.gbl...

In the exampe below, the constructor of the container class is passed the string called "foo". Within the container class, I would like to create an instance(s) of foo and add them to the ArrayList that is returned. (Once I figure this out I will use reflection on the instance to do other stuff)

Anyway, How to I dyanamically create a new instance of a class from
ClassName string?

Thanks for your Help

Earl

private void Button1_Click(o bject sender, System.EventArg s e)
{
container mycontainer = new container("foo" );
ArrayList fooArrayList = mycontainer.Get ListOfObjects() ;
}

public class container
{
public string ClassName;
public container(objec t ClassName)
{
this.ClassName= ClassName;
}

public ArrayList GetListOfObject s()
{
ArrayList myArrayList = new ArrayList();
for(int i=1;i<10;i++)
{
//Convert.ToClass (ClassName) myClass = new Convert.ToClass (ClassName) //myArrayList.Add (myClass);
}
return myArrayList;
}
}

public class foo
{
public string a="ahhhh";
public string b="bee";
public string c="see";
}
}