Re: [Pnet-developers] [bugs #11998] Problems with casting arrays, isinst, and the as operator

[Marcus]

The test case was designed to illustrate the incorrect behavior under Pnet. 
The code that I am writing is more complex.

Specifically, I am working on some performance enhancements to the 
System.Array.Sort() set of methods. These overloaded methods all take 
parmeters of type Array. The Array type is very general and supports things 
like multi-dimensional arrays and arrays that are not zero-based.

In some cases, it is possible to enhance performance greatly, but it requires 
the ability to attempt casting an Array to object[] without generating an 
exception in the case of failure. The "as" operator provides that 
functionality. This is important because only some arrays passed to 
Array.Sort() will be able to be cast this way.


On Thursday 17 February 2005 2:13 am, James Michael DuPont wrote:
> Follow-up Comment #2, bugs #11998 (project dotgnu-pnet):
>
> The workaround is to cast the object directly without as.
> the test file shows that this works, and the data is preserved.
> using System;
>
> public class Testing
> {
>       public static void Main()
>       {
>
>               String foo = "fooo";
>               Console.WriteLine(foo == null );
>
>               object z= foo as object;
>               Console.WriteLine(z == null );
>
>               Array x = new string[1];
>               x[0]=foo;
>               Console.WriteLine(x == null );
>
>               Console.WriteLine("raw");
>               Console.WriteLine(x);
>
>               Console.WriteLine("as object");
>               Console.WriteLine(x as object[]);
>
>               Console.WriteLine("cast ");
>               Console.WriteLine((object[])x);
>
>               Console.WriteLine("cast2 ");
>               object[] y = (object[])x;
>               Console.WriteLine(y == null );
>               Console.WriteLine(y);
>               Console.WriteLine(y[0]);
>
>               Console.WriteLine("cast as ");
>               object[] z2 = x as object[];
>               Console.WriteLine(z2 == null );
>
>       }
> }