How to pass arguments to a property in C#?

[Prachi Dimble]

Hi,

In vb.Net one can pass arguments to properties. How does one achieve it in c#? Given below is the vb.net code for passing arguments to property getters and setters..

Thanks,
Prachi

Public Property Field(ByVal strFieldName As String, Optional ByVal tableName As String = "", Optional ByVal rowNum As Integer = 0)
Get
If tableName <> "" Then Return objDataSet.Tabl es(tableName).R ows(rowNum)(str FieldName)
Return objDataSet.Tabl es(objDataSet.T ables.Count - 1).Rows(rowNum) (strFieldName)
End Get

Set(ByVal Value)
If tableName <> "" Then
objDataSet.Tabl es(tableName).R ows(rowNum)(str FieldName) = Value
Else
objDataSet.Tabl es(objDataSet.T ables.Count - 1).Rows(rowNum) (strFieldName) = Value
End If
End Set
End Property

[Jon Skeet [C# MVP]]

Prachi Dimble <pr****@eximiuu s.com> wrote:

In vb.Net one can pass arguments to properties. How does one achieve
it in c#? Given below is the vb.net code for passing arguments to
property getters and setters..

In C#, you can only pass parameters to special properties called
indexers. You'll need to make your property an indexer for your class.

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

[Michael S]

"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com...

Prachi Dimble <pr****@eximiuu s.com> wrote:

In vb.Net one can pass arguments to properties. How does one achieve
it in c#? Given below is the vb.net code for passing arguments to
property getters and setters..

In C#, you can only pass parameters to special properties called
indexers. You'll need to make your property an indexer for your class.

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

I think C# is quite cumbersome with this indexer-thingy. I wonder why
Hejlsberg et al decided do go for such complexity, when Delphi sported
parameterized properties in just the way VB.NET does stuff. They shoulod
have known better....

- Michael S

[Joanna Carter \(TeamB\)]

"Michael S" <a@b.c> a écrit dans le message de news:
ua************* @TK2MSFTNGP12.p hx.gbl...

I think C# is quite cumbersome with this indexer-thingy. I wonder why
Hejlsberg et al decided do go for such complexity, when Delphi sported
parameterized properties in just the way VB.NET does stuff. They shoulod
have known better....

Which is why Delphi for .NET as provided (along with C#) by Delphi 2005 is
such a good idea. All the heritage of Delphi in the best OO framework .NET.

Joanna

--
Joanna Carter
Consultant Software Engineer

[Prachi Dimble]

okay!

Thanks,
Prachi

"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com...

Prachi Dimble <pr****@eximiuu s.com> wrote:

In vb.Net one can pass arguments to properties. How does one achieve
it in c#? Given below is the vb.net code for passing arguments to
property getters and setters..

In C#, you can only pass parameters to special properties called
indexers. You'll need to make your property an indexer for your class.

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

[Christof Nordiek]

"Prachi Dimble" <pr****@eximiuu s.com> schrieb im Newsbeitrag
news:eX******** ******@TK2MSFTN GP10.phx.gbl...

Hi,
In vb.Net one can pass arguments to properties. How does one achieve it in
c#? Given below is the vb.net code >for passing arguments to property
getters and setters..
Thanks,
Prachi
Public Property Field(ByVal strFieldName As String, Optional ByVal
tableName As String = "", Optional ByVal >rowNum As Integer = 0)
Get
If tableName <> "" Then Return
objDataSet.Tabl es(tableName).R ows(rowNum)(str FieldName)
Return objDataSet.Tabl es(objDataSet.T ables.Count -
1).Rows(rowNum) (strFieldName)
End Get
Set(ByVal Value)
If tableName <> "" Then
objDataSet.Tabl es(tableName).R ows(rowNum)(str FieldName) = Value
Else
objDataSet.Tabl es(objDataSet.T ables.Count -
1).Rows(rowNum) (strFieldName) = Value
End If
End Set
End Property

Hi Parichi,

to call parameterized properties from VB.NET in C# you have to call the
accessormethods :
field = VBObject.get_Fi eld(...);
VBObject.setFie ld(......,field );

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

I think it's a simplicity

obj.Field( "string1", "string2", 3)

Is that a method or a property being called?

In C# you know it;s a method. What about with the code provided by the OP ?

IMO if you need to pass parameters you better go with a method.


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

I think C# is quite cumbersome with this indexer-thingy. I wonder why
Hejlsberg et al decided do go for such complexity, when Delphi sported
parameterized properties in just the way VB.NET does stuff. They shoulod
have known better....

- Michael S

[Daniel Jin]

we can use [] notation like the indexers currently do.

I think it'd be a nice feature to have. for example, say I'm implementing a
shopping cart that exposes line items, and I want to access it like

orderEntry = myCart.LineItem s[productID];

currently, I'd have to have a property LineItems that exposes the underlying
line item collection with the indexer. and if this line item collection has
methods that mutates the collection that i don't want to expose outside of
the API, I'd have to mark them as internal, or return some kind of readonly
wrapper.

or alternatively, if parameterized properties are supported, I don't have to
expose the internal collection at all. Just make a property of shopping cart
called LineItems that take product ID as a parameter.

"Ignacio Machin ( .NET/ C# MVP )" wrote:

I think it's a simplicity

obj.Field( "string1", "string2", 3)

Is that a method or a property being called?

In C# you know it;s a method. What about with the code provided by the OP ?

IMO if you need to pass parameters you better go with a method.


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

I think C# is quite cumbersome with this indexer-thingy. I wonder why
Hejlsberg et al decided do go for such complexity, when Delphi sported
parameterized properties in just the way VB.NET does stuff. They shoulod
have known better....

- Michael S

[Michael S]

Indeed.

And C# indexer approach is just a limitation that demands a workaround to
achieve what VB/Delphi sport with grace. But I am curious why Hejlsberg et
al decided to take this approach. For me it makes no sense.

- Michael S

"Daniel Jin" <Da*******@disc ussions.microso ft.com> wrote in message
news:F2******** *************** ***********@mic rosoft.com...

we can use [] notation like the indexers currently do.

I think it'd be a nice feature to have. for example, say I'm implementing
a
shopping cart that exposes line items, and I want to access it like

orderEntry = myCart.LineItem s[productID];

currently, I'd have to have a property LineItems that exposes the
underlying
line item collection with the indexer. and if this line item collection
has
methods that mutates the collection that i don't want to expose outside of
the API, I'd have to mark them as internal, or return some kind of
readonly
wrapper.

or alternatively, if parameterized properties are supported, I don't have
to
expose the internal collection at all. Just make a property of shopping
cart
called LineItems that take product ID as a parameter.

"Ignacio Machin ( .NET/ C# MVP )" wrote:

I think it's a simplicity

obj.Field( "string1", "string2", 3)

Is that a method or a property being called?

In C# you know it;s a method. What about with the code provided by the OP
?

IMO if you need to pass parameters you better go with a method.


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

> I think C# is quite cumbersome with this indexer-thingy. I wonder why
> Hejlsberg et al decided do go for such complexity, when Delphi sported
> parameterized properties in just the way VB.NET does stuff. They
> shoulod
> have known better....
>
> - Michael S
>
>

[James Curran]

"Ignacio Machin ( .NET/ C# MVP )" <ignacio.mach in AT dot.state.fl.us > wrote
in message news:u3******** ******@TK2MSFTN GP15.phx.gbl...

obj.Field( "string1", "string2", 3)

Is that a method or a property being called?

In C# you know it;s a method. What about with the code provided by the OP

?

Well, since nothing is assigned to it, nor assigned from it, it would
have to be a method in any language, right? ;-)

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

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