Hi,
is there a reason for C# to require attribute arguments (properties) to be
read-write while VB and C++ are happy with only a setter?
Simplified Example:
public sealed class FooAttribute : Attribute
{
private string s;
public string Data { set { s = value; } };
}
[Foo(Data="bar")] won't work in C#, but in VB.NET and C++.
Jens.
-- http://ManagedXLL.net/ | http://jens-thiel.de/ | http://QuantLib.net/
Replace MSDN with my first name when replying to my email address! 12  2027 
Jens,
I believe it's an attempt on the part of the designers of the language
to enforce good design (the thinking being when would you write a value and
not be able to read it?).
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Jens Thiel" <MS**@Thiel.d e> wrote in message
news:uX******** ******@tk2msftn gp13.phx.gbl... Hi,
is there a reason for C# to require attribute arguments (properties) to be
read-write while VB and C++ are happy with only a setter?
Simplified Example:
public sealed class FooAttribute : Attribute
{
private string s;
public string Data { set { s = value; } };
}
[Foo(Data="bar")] won't work in C#, but in VB.NET and C++.
Jens.
--
http://ManagedXLL.net/ | http://jens-thiel.de/ | http://QuantLib.net/
Replace MSDN with my first name when replying to my email address!
Well,
isn't it my part to decide how I retrieve something from an attribute? In
this case, it's an int[] array, which was also the original design until it
turned out that the current VB.NET can't handle array attribute properties.
I think that this is an unnecessary design restriction, and both the VB and
C++ teams didn't follow this. Do you know a way to suggest this to the
"language designers"?
Jens.
-- http://ManagedXLL.net/ | http://jens-thiel.de/ | http://QuantLib.net/
Replace MSDN with my first name when replying to my email address!
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:Oj******** ******@TK2MSFTN GP10.phx.gbl... Jens,
I believe it's an attempt on the part of the designers of the language
to enforce good design (the thinking being when would you write a value
and not be able to read it?).
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Jens Thiel" <MS**@Thiel.d e> wrote in message
news:uX******** ******@tk2msftn gp13.phx.gbl... Hi,
is there a reason for C# to require attribute arguments (properties) to
be read-write while VB and C++ are happy with only a setter?
Simplified Example:
public sealed class FooAttribute : Attribute
{
private string s;
public string Data { set { s = value; } };
}
[Foo(Data="bar")] won't work in C#, but in VB.NET and C++.
Jens.
--
http://ManagedXLL.net/ | http://jens-thiel.de/ |
http://QuantLib.net/ Replace MSDN with my first name when replying to my email address!
http://msdn.microsoft.com/vcsharp/te...k/default.aspx
Have you considered using the constructor of the attribute to pass in your
array?
"Jens Thiel" <MS**@Thiel.d e> wrote in message
news:OP******** ******@TK2MSFTN GP09.phx.gbl... Well,
isn't it my part to decide how I retrieve something from an attribute? In
this case, it's an int[] array, which was also the original design until
it turned out that the current VB.NET can't handle array attribute
properties.
I think that this is an unnecessary design restriction, and both the VB
and C++ teams didn't follow this. Do you know a way to suggest this to the
"language designers"?
Jens.
--
http://ManagedXLL.net/ | http://jens-thiel.de/ | http://QuantLib.net/
Replace MSDN with my first name when replying to my email address!
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:Oj******** ******@TK2MSFTN GP10.phx.gbl... Jens,
I believe it's an attempt on the part of the designers of the
language to enforce good design (the thinking being when would you write a value and not be able to read it?).
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Jens Thiel" <MS**@Thiel.d e> wrote in message
news:uX******** ******@tk2msftn gp13.phx.gbl... Hi,
is there a reason for C# to require attribute arguments (properties)
to be read-write while VB and C++ are happy with only a setter?
Simplified Example:
public sealed class FooAttribute : Attribute
{
private string s;
public string Data { set { s = value; } };
}
[Foo(Data="bar")] won't work in C#, but in VB.NET and C++.
Jens.
--
http://ManagedXLL.net/ | http://jens-thiel.de/ | http://QuantLib.net/ Replace MSDN with my first name when replying to my email address!
Oh, and you might want to checkout this video before sending feedback :)
(he's the guy you'll be emailing) http://channel9.msdn.com/ShowPost.aspx?PostID=6186
"Andy Gaskell" <pubb AT hotmail DOT com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. .. http://msdn.microsoft.com/vcsharp/te...k/default.aspx
Have you considered using the constructor of the attribute to pass in your
array?
"Jens Thiel" <MS**@Thiel.d e> wrote in message
news:OP******** ******@TK2MSFTN GP09.phx.gbl... Well,
isn't it my part to decide how I retrieve something from an attribute?
In this case, it's an int[] array, which was also the original design until
it turned out that the current VB.NET can't handle array attribute
properties.
I think that this is an unnecessary design restriction, and both the VB
and C++ teams didn't follow this. Do you know a way to suggest this to the
"language designers"?
Jens.
--
http://ManagedXLL.net/ | http://jens-thiel.de/ |
http://QuantLib.net/ Replace MSDN with my first name when replying to my email address!
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:Oj******** ******@TK2MSFTN GP10.phx.gbl... Jens,
I believe it's an attempt on the part of the designers of the language to enforce good design (the thinking being when would you write a
value and not be able to read it?).
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Jens Thiel" <MS**@Thiel.d e> wrote in message
news:uX******** ******@tk2msftn gp13.phx.gbl...
> Hi,
>
> is there a reason for C# to require attribute arguments (properties)
to be > read-write while VB and C++ are happy with only a setter?
>
> Simplified Example:
>
> public sealed class FooAttribute : Attribute
> {
> private string s;
> public string Data { set { s = value; } };
> }
>
>
> [Foo(Data="bar")] won't work in C#, but in VB.NET and C++.
>
> Jens.
>
> --
> http://ManagedXLL.net/ | http://jens-thiel.de/ |
http://QuantLib.net/ > Replace MSDN with my first name when replying to my email address!
>
>
"Andy Gaskell" <pubb AT hotmail DOT com> wrote http://msdn.microsoft.com/vcsharp/te...k/default.aspx
Have you considered using the constructor of the attribute to pass in your
array?
Yes, but I didn't check if this works with VB.NET. I need two of these
properties, min and max array lengths in multiple dimensions, both of them
optional. I now use a string "slices x rows x columns" (which is splitted
and parsed internally) and provide a dummy getter for C#.
Will check out the ask.... link and the video tomorrow. Thanks.
Jens.
-- http://ManagedXLL.net/
Replace MSDN with my first name when replying to my email address!
Hi Andy,
Based on my understanding, you want to pass int array into attribute.
As I tried, this can be done in C#, but it seems that it will result in
error in VB.net. I will spend some time on this issue to find the reason
for you.
Thanks for your understanding.
Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
""Jeffrey Tan[MSFT]"" <v-*****@online.mi crosoft.com> wrote Hi Andy,
Based on my understanding, you want to pass int array into attribute.
As I tried, this can be done in C#, but it seems that it will result in
error in VB.net. I will spend some time on this issue to find the reason
for you.
Hi Jeffrey,
it's me, Jens, who asked the original question. I know that it can be done
in C#, but it is not supported in VB.NET (see the specs on attribute
properties). I heard that the Whidbey release will support it but I can't
tell my customers to wait that long. I already replaced the int[] with a
string that is parsed into an array internally.
The original topic was the CS0617 that you get when you try to set a
write-only property (see example in original post). I think it is an
unnecessary restriction to demand that an attribute property is read-write -
at least I can not see a reason why it is forced by C#, while VB.NET and
C++.NET are happy without it.
As Andy suggested, I emailed Eric Gunnerson. Don't know if he has time to
read his emails though. My suggestion would be to relax the "read-write
attribute property" requirement in a future release.
I'm otherwise happy and do not require a solution or workaround.
Jens.
-- http://ManagedXLL.net/
Replace MSDN with my first name when replying to my email address!
Hi Jens,
Thanks for your feedback.
Yes, VB.net can not do this, I think this is the limitation of the
language.
For your originally concern of needing read-write property for attribute in
C# language, I will help you forword this to the our product group.
Thank you for your patience and cooperation. If you have any questions or
concerns, please feel free to post it in the group. I am standing by to be
of assistance.
Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
Hi Jens,
I have got a reply from Eric Gunnerson, the PROGRAM MANAGER of Visual C#.
As he said, It's a deliberate choice. http://blogs.msdn.com/csharpfaq/arch...11/130236.aspx
But, I think this does not resolve the write-only problem. I have consulted
him for write-only property issue. Thanks
Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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