dynamic member reference

[Sharon]

Hi to all.
How do i reference a class member dynamically?
Somthing like:
byte i = 35;
Button currentButton = this["button" + i.ToString()];
Thanks,
Sharon.

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

You can use reflection, it does always works.

If you have either a controls ( either web or win) collection you could
iterate in the collection looking for the name of the control.

In a similar way you could create a hash with the controls that you needs to
have accesibles and use as the key the value you want.
cheers,

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

"Sharon" <ta*******@void.null> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl...

Hi to all.
How do i reference a class member dynamically?
Somthing like:
byte i = 35;
Button currentButton = this["button" + i.ToString()];
Thanks,
Sharon.

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

Sharon,

You would have to use reflection. First, you get the type for your
class. If the type is referenced, then you can do this:

// Get the Type.
Type type = typeof(<containing class>);

Or, you can just call GetType on yourself (or any other object
reference):

// Get the type.
Type type = this.GetType();

Then, you get the name of the field that you want:

// Get the field information.
FieldInfo fieldInfo = type.GetField("button" + i.ToString());

Finally, to get the field, you would call GetValue, passing the instance
of the object you want to get the field for:

// Get the value. The value has to be cast to a Button, since GetValue
returns an object.
Button currentButton = (Button) fieldInfo.GetValue(this);

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

"Sharon" <ta*******@void.null> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl...

Hi to all.
How do i reference a class member dynamically?
Somthing like:
byte i = 35;
Button currentButton = this["button" + i.ToString()];
Thanks,
Sharon.

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

That might not always be the case. If one doesn't have permission for
reflection, it won't work.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us> wrote
in message news:Ok**************@TK2MSFTNGP10.phx.gbl...

Hi,

You can use reflection, it does always works.

If you have either a controls ( either web or win) collection you could
iterate in the collection looking for the name of the control.

In a similar way you could create a hash with the controls that you needs
to have accesibles and use as the key the value you want.
cheers,

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

"Sharon" <ta*******@void.null> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl...

Hi to all.
How do i reference a class member dynamically?
Somthing like:
byte i = 35;
Button currentButton = this["button" + i.ToString()];
Thanks,
Sharon.

[Sharon]

type.GetField("button" + i.ToString())
returns null.
type.GetField("button1")
also returns null.
Does it have to be a static member?
Shron.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:ur**************@TK2MSFTNGP10.phx.gbl...

Sharon,

You would have to use reflection. First, you get the type for your
class. If the type is referenced, then you can do this:

// Get the Type.
Type type = typeof(<containing class>);

Or, you can just call GetType on yourself (or any other object
reference):

// Get the type.
Type type = this.GetType();

Then, you get the name of the field that you want:

// Get the field information.
FieldInfo fieldInfo = type.GetField("button" + i.ToString());

Finally, to get the field, you would call GetValue, passing the instance of the object you want to get the field for:

// Get the value. The value has to be cast to a Button, since GetValue
returns an object.
Button currentButton = (Button) fieldInfo.GetValue(this);

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

"Sharon" <ta*******@void.null> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl...

Hi to all.
How do i reference a class member dynamically?
Somthing like:
byte i = 35;
Button currentButton = this["button" + i.ToString()];
Thanks,
Sharon.

[Sharon]

Silly me, reflection cannot see private fields.
Thanks a bunch Nicholas.

"Sharon" <ta*******@void.null> wrote in message
news:uU**************@TK2MSFTNGP12.phx.gbl...

type.GetField("button" + i.ToString())
returns null.
type.GetField("button1")
also returns null.
Does it have to be a static member?
Shron.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in message news:ur**************@TK2MSFTNGP10.phx.gbl...

Sharon,

You would have to use reflection. First, you get the type for your
class. If the type is referenced, then you can do this:

// Get the Type.
Type type = typeof(<containing class>);

Or, you can just call GetType on yourself (or any other object
reference):

// Get the type.
Type type = this.GetType();

Then, you get the name of the field that you want:

// Get the field information.
FieldInfo fieldInfo = type.GetField("button" + i.ToString());

Finally, to get the field, you would call GetValue, passing the

instance

of the object you want to get the field for:

// Get the value. The value has to be cast to a Button, since GetValue
returns an object.
Button currentButton = (Button) fieldInfo.GetValue(this);

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

"Sharon" <ta*******@void.null> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl...

Hi to all.
How do i reference a class member dynamically?
Somthing like:
byte i = 35;
Button currentButton = this["button" + i.ToString()];
Thanks,
Sharon.