Passing a Property

[bill]

Hi

I'd like to pass a property (say like a row value from a typed dataset) to a
method so that the method can get/set the property. for instance

DoSomething(ATy pedRow.StringFi eld)

where "StringFiel d" is a string property on a typed row.

however, DoSomething requires a string argument in this case

private void DoSomething(str ing aField)
{
aField = "new stuff"; // throws exception
}

Any ideas?

thanks

bill

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

Re: Passing a Property

Bill,

Since a property is in essence a method that is called, you need to pass
the object that exposes the property and then set the property from inside
the method.

I think that a better solution would be to have the method return the
value somehow (returning, or through a ref/out parameter), and then set the
property outside of the method.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"bill" <sutphinwb@nosp am.nospam> wrote in message
news:e8i8DLLeEH A.1644@tk2msftn gp13.phx.gbl...[color=blue]
> Hi
>
> I'd like to pass a property (say like a row value from a typed dataset) to[/color]
a[color=blue]
> method so that the method can get/set the property. for instance
>
> DoSomething(ATy pedRow.StringFi eld)
>
> where "StringFiel d" is a string property on a typed row.
>
> however, DoSomething requires a string argument in this case
>
> private void DoSomething(str ing aField)
> {
> aField = "new stuff"; // throws exception
> }
>
> Any ideas?
>
> thanks
>
> bill
>
>[/color]

[bill]

Re: Passing a Property

Well, here is what is happening. I have a typed dataset with a lot of
fields. Most of them are strings. I am passing info back from a form that
has to fill the typed row. OK. I want to set the field to the value in a
control unless it is blank. so what I have is about fifty

if(c_MyFirstNam e.Text.Lenth > 0)
{
aRow.MyFirstNam e = c_MyFirstName.T ext)
}

clauses. so I thought I could have a method to shorten this repetitive
action up

AssignStringToR ow(string aInput, some_type aProperty)

where the above code could be generic

if(aInput.Lengt h > 0)
{
aProperty = aInput;
}

then I'd have a bunch of

AssignStringToR ow(c_MyFirstNam e.Text, aRow.MyFirstNam e);

if I pass the row in, I don't know what field to assign unless I pass a
string or index in and then the battle is lost as far a type safety. also
if I return a value, I will set the row value to something every time as in

aRow.MayFirstNa me = AssignStringToR ow(c_MyFirstNam e.Text);

what happens when input string is blank? do I return a null? I don't think
so. You have to use SetMyFirstNameN ull() to do that. Else I could assign
blank strings? It just seems a waste, or ugly, or something. I'd rather
have the "if" clauses.


bill


"Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c om> wrote in
message news:%23TKBjfLe EHA.1000@TK2MSF TNGP12.phx.gbl. ..[color=blue]
> Bill,
>
> Since a property is in essence a method that is called, you need to[/color]
pass[color=blue]
> the object that exposes the property and then set the property from inside
> the method.
>
> I think that a better solution would be to have the method return the
> value somehow (returning, or through a ref/out parameter), and then set[/color]
the[color=blue]
> property outside of the method.
>
> Hope this helps.
>
>
> --
> - Nicholas Paldino [.NET/C# MVP]
> - mvp@spam.guard. caspershouse.co m
>
> "bill" <sutphinwb@nosp am.nospam> wrote in message
> news:e8i8DLLeEH A.1644@tk2msftn gp13.phx.gbl...[color=green]
> > Hi
> >
> > I'd like to pass a property (say like a row value from a typed dataset)[/color][/color]
to[color=blue]
> a[color=green]
> > method so that the method can get/set the property. for instance
> >
> > DoSomething(ATy pedRow.StringFi eld)
> >
> > where "StringFiel d" is a string property on a typed row.
> >
> > however, DoSomething requires a string argument in this case
> >
> > private void DoSomething(str ing aField)
> > {
> > aField = "new stuff"; // throws exception
> > }
> >
> > Any ideas?
> >
> > thanks
> >
> > bill
> >
> >[/color]
>
>[/color]