A property or indexer may not be passed as an out or ref parameter

[rwoo_98]

I am trying to pass a reference to a method --SomeMethod. This table
resides in a dataset and I refer to the datatable in the dataset using
an indexer. However when I attempt to do this I get the error message,
"A property or indexer may not be passed as an out or ref parameter?"

Here is the code

SomeMethod(ref ds_User.Tables[1]);
The only way I got it to work is to do the following:

DataTable dt_User;
dt_User = ds_User.Tables[1];
SomeMethod(ref dtUser);

Is there a cleaner method of accomplishing this? I know you VB.Net
allows you to use a property or indexer as a ref when calling a method.
Any idea why C# doesn't?

Thanks in advance.

[Robert W.]

I'm not 100% sure but I think you need to Google for "Delegate C#". I
believe that you need to implement a Delegate to "pass" a method.
--
Robert W.
Vancouver, BC
www.mwtech.com

"rw*****@yahoo. com" wrote:

I am trying to pass a reference to a method --SomeMethod. This table
resides in a dataset and I refer to the datatable in the dataset using
an indexer. However when I attempt to do this I get the error message,
"A property or indexer may not be passed as an out or ref parameter?"

Here is the code

SomeMethod(ref ds_User.Tables[1]);
The only way I got it to work is to do the following:

DataTable dt_User;
dt_User = ds_User.Tables[1];
SomeMethod(ref dtUser);

Is there a cleaner method of accomplishing this? I know you VB.Net
allows you to use a property or indexer as a ref when calling a method.
Any idea why C# doesn't?

Thanks in advance.

[James Curran]

"Robert W." <Ro*****@discus sions.microsoft .com> wrote in message
news:12******** *************** ***********@mic rosoft.com...

I'm not 100% sure but I think you need to Google for "Delegate C#". I
believe that you need to implement a Delegate to "pass" a method.

But he's not want to pass a method; he wants to pass the value returned
by a method (and has the method being called affect that object)
--
--
Truth,
James Curran
[erstwhile VC++ MVP]

Home: www.noveltheory.com Work: www.njtheater.com
Blog: www.honestillusion.com Day Job: www.partsearch.com

[James Curran]

As far as I can see, VB.Net is just doing your workaround for you behind
that scenes. The reason C# doesn't its probably because that isn't
guareteed to work in all cases.

--
--
Truth,
James Curran
[erstwhile VC++ MVP]

Home: www.noveltheory.com Work: www.njtheater.com
Blog: www.honestillusion.com Day Job: www.partsearch.com

<rw*****@yahoo. com> wrote in message
news:11******** **************@ g49g2000cwa.goo glegroups.com.. .

I am trying to pass a reference to a method --SomeMethod. This table
resides in a dataset and I refer to the datatable in the dataset using
an indexer. However when I attempt to do this I get the error message,
"A property or indexer may not be passed as an out or ref parameter?"

Here is the code

SomeMethod(ref ds_User.Tables[1]);
The only way I got it to work is to do the following:

DataTable dt_User;
dt_User = ds_User.Tables[1];
SomeMethod(ref dtUser);

Is there a cleaner method of accomplishing this? I know you VB.Net
allows you to use a property or indexer as a ref when calling a method.
Any idea why C# doesn't?

Thanks in advance.

[Jeremy Williams]

No, as the error states, you cannot do it the way you want. However, is it
really necessary to use 'ref' for the parameter? If you are trying to modify
data in the data table, then 'ref' is not necessary. What does 'SomeMethod'
do? Are you actually trying to change the table reference stored in the
Tables collection of the DataSet?

<rw*****@yahoo. com> wrote in message
news:11******** **************@ g49g2000cwa.goo glegroups.com.. .

I am trying to pass a reference to a method --SomeMethod. This table
resides in a dataset and I refer to the datatable in the dataset using
an indexer. However when I attempt to do this I get the error message,
"A property or indexer may not be passed as an out or ref parameter?"

Here is the code

SomeMethod(ref ds_User.Tables[1]);
The only way I got it to work is to do the following:

DataTable dt_User;
dt_User = ds_User.Tables[1];
SomeMethod(ref dtUser);

Is there a cleaner method of accomplishing this? I know you VB.Net
allows you to use a property or indexer as a ref when calling a method.
Any idea why C# doesn't?

Thanks in advance.

[rwoo_98]

Thanks Jeremy. You are correct, there was no need to make the
parameter a 'ref'. Thanks again.