parametize the "is" keyword

[newcomer2k@yahoo.com]

Hi,
I understand how to use the "is" keyword straight forward.
like: if (obj is MyClass1)

However, I would like to parametize the "is"'s argument. Basically, I
would to replace MyClass1 with an argument. Here is an example:

private void foo(WhatType arg)
{
foreach (Control uc in _displayPanel.C ontrols)
{
if (uc is arg)
uc.Visible = true;
else
uc.Visible = false;
}
}

And call foo like...

foo(MyClass1);

My trouble is, I don't know what is the "arg"'s type? i.e. what
should "WhatType" be?
Is this is even possible?
Thanks for any pointer.
Minh (MCP)

[Terry Rogers]

Re: parametize the "is&quo t; keyword

Perhaps you require a generic method, e.g.

private void foo<T>(T arg)
{
foreach (Control uc in _displayPanel.C ontrols)
{
if(uc is T)
uc.Visible = true;
else
uc.Visible = false;
}
}

Do some research on generics for more info.


On Jan 30, 4:42 pm, newcome...@yaho o.com wrote:

Hi,
I understand how to use the "is" keyword straight forward.
like: if (obj is MyClass1)
>
However, I would like to parametize the "is"'s argument. Basically, I
would to replace MyClass1 with an argument. Here is an example:
>
private void foo(WhatType arg)
{
foreach (Control uc in _displayPanel.C ontrols)
{
if (uc is arg)
uc.Visible = true;
else
uc.Visible = false;
}
}
>
And call foo like...
>
foo(MyClass1);
>
My trouble is, I don't know what is the "arg"'s type? i.e. what
should "WhatType" be?
Is this is even possible?
Thanks for any pointer.
Minh (MCP)

[Horacio N. Hdez.]

Re: parametize the &quot;is&quo t; keyword

Hi,

You can use the typeof,
something like this

private void foo(Type arg)

{
foreach (Control uc in _displayPanel.C ontrols)
{
if (typeof(uc) is arg)
uc.Visible = true;
else
uc.Visible = false;
}
}

And you can use it:

Type theType = typeof(bar);
foo(theType);

_______________ ______________

http://elblogdehoracio.blogspot.com

On 30 ene, 17:42, newcome...@yaho o.com wrote:

Hi,
I understand how to use the "is" keyword straight forward.
like: if (obj is MyClass1)
>
However, I would like to parametize the "is"'s argument. Basically, I
would to replace MyClass1 with an argument. Here is an example:
>
private void foo(WhatType arg)
{
foreach (Control uc in _displayPanel.C ontrols)
{
if (uc is arg)
uc.Visible = true;
else
uc.Visible = false;
}
}
>
And call foo like...
>
foo(MyClass1);
>
My trouble is, I don't know what is the "arg"'s type? i.e. what
should "WhatType" be?
Is this is even possible?
Thanks for any pointer.
Minh (MCP)

[newcomer2k@yahoo.com]

Re: parametize the &quot;is&quo t; keyword

I think typeof takes class name not an instance.
I did tried in foo
if (uc.GetType() == type)

However, in my case (ASP.NET UserControl), the GetType() returns
ASP.MyClass1 rather than just MyClass1. Hence, the comparison fail.

Terry, I will try the generic function version later...

On Jan 30, 11:55 am, "Horacio N. Hdez." <hnh12...@gmail .comwrote:

Hi,
>
You can use the typeof,
something like this
>
private void foo(Type arg)
>

{
foreach (Control uc in _displayPanel.C ontrols)
{
if (typeof(uc) is arg)
uc.Visible = true;
else
uc.Visible = false;
}
}And you can use it:

>
Type theType = typeof(bar);
foo(theType);
>
_______________ ______________h ttp://elblogdehoracio .blogspot.com
>
On 30 ene, 17:42, newcome...@yaho o.com wrote:
>
>
>

Hi,
I understand how to use the "is" keyword straight forward.
like: if (obj is MyClass1)

>

However, I would like to parametize the "is"'s argument. Basically, I
would to replace MyClass1 with an argument. Here is an example:

>

private void foo(WhatType arg)
{
foreach (Control uc in _displayPanel.C ontrols)
{
if (uc is arg)
uc.Visible = true;
else
uc.Visible = false;
}
}

>

And call foo like...

>

foo(MyClass1);

>

My trouble is, I don't know what is the "arg"'s type? i.e. what
should "WhatType" be?
Is this is even possible?
Thanks for any pointer.
Minh (MCP)- Hide quoted text -- Show quoted text -

[Jon Skeet [C# MVP]]

Re: parametize the &quot;is&quo t; keyword

<newcomer2k@yah oo.comwrote:

I think typeof takes class name not an instance.
I did tried in foo
if (uc.GetType() == type)
>
However, in my case (ASP.NET UserControl), the GetType() returns
ASP.MyClass1 rather than just MyClass1. Hence, the comparison fail.

Have a look at Type.IsAssignab leFrom.

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

[newcomer2k@yahoo.com]

Re: parametize the &quot;is&quo t; keyword

On Jan 30, 2:36 pm, Jon Skeet [C# MVP] <s...@pobox.com wrote:

<newcome...@yah oo.comwrote:

I think typeof takes class name not an instance.
I did tried in foo
if (uc.GetType() == type)

>

However, in my case (ASP.NET UserControl), the GetType() returns
ASP.MyClass1 rather than just MyClass1. Hence, the comparison fail.

>
Have a look at Type.IsAssignab leFrom.
>

Yeah, I think that would work too...

Anyway, this seems to work too. Pass typeof(ASP.MyCl ass1) insteads of
typeof(MyClass1 )

Still would like to use the "is" keyword...:(

[Frans Bouma [C# MVP]]

Re: parametize the &quot;is&quo t; keyword

newcomer2k@yaho o.com wrote:

Hi,
I understand how to use the "is" keyword straight forward.
like: if (obj is MyClass1)
>
However, I would like to parametize the "is"'s argument. Basically,
I would to replace MyClass1 with an argument. Here is an example:
>
private void foo(WhatType arg)
{
foreach (Control uc in _displayPanel.C ontrols)
{
if (uc is arg)
uc.Visible = true;
else
uc.Visible = false;
}
}
>
And call foo like...
>
foo(MyClass1);
>
My trouble is, I don't know what is the "arg"'s type? i.e. what
should "WhatType" be?

private void foo(Type arg)
{
foreach (Control uc in _displayPanel.C ontrols)
{
uc.Visible=(uc. GetType()==arg) ;
}
}

FB


--
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Lead developer of LLBLGen Pro, the productive O/R mapper for .NET
LLBLGen Pro website: http://www.llblgen.com
My .NET blog: http://weblogs.asp.net/fbouma
Microsoft MVP (C#)
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