dotnet sdk:
I have created a custom attribute that takes a string property. I
want to put the current Assembly version in the property and I get
this error:

"An attribute argument must be a constant expression, typeof
expression or array creation expression".


What can I do to make ths work:

[MyCustomAttribute(
"ver " +
System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString()
)]
public class Class1
{
public Class1()
{
DateTime dtt = DateTime.Now;
}
}

Thanks.

Hi,

I am afraid it is impossible to use a runtime expression in Attribute
arguments.

The instance of an attribute class is constructed by the compiler when the
compile detects an attribute applied to a target, and at this time the
assembly hasn't been completed yet. And then the compiler initializes any
public fields and properties have been specified. After that, the instance
of the attribute is serialized to the target's metadata table entry.

Please Note: all these are done by the compiler and there is not a way to
get any runtime variable.

Hope this helps.

Best regards,

Peter Huang
Microsoft Online Partner Support

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