Hi,

I want to concatenate two string arrays. Is it possible to concatenate them
gracefully, i.e. without copying each element manually?

TIA,
Axel Dahmen

PS.: Here's an example of what I am about:

string[] lst1,lst2,ret;
lst1=Directory.GetFiles("C:\Temp\*.jpg");
lst2=Directory.GetFiles("C:\Temp\*.gif");

ret=lst1+lst2; // ????

Axel Dahmen <NO_SPAM@No_Spammer_Knows.invalid> wrote:
> I want to concatenate two string arrays. Is it possible to concatenate them
> gracefully, i.e. without copying each element manually?

It depends on exactly what you mean by "manually". Array.Copy and
Array.CopyTo will probably help you, but obviously you still need to do
the copy *somehow*.

--
Jon Skeet - <(E-Mail Removed)>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

Declare a new String array with the correct number of elements. Then use
the Copy method of Array to copy the two arrays into the new array. This
takes 3 lines of code but should be faster than doing two loops. Note that
this performs a shallow copy.

Robby


"Axel Dahmen" <NO_SPAM@No_Spammer_Knows.invalid> wrote in message
news:%23B$(E-Mail Removed)...
> Hi,
>
> I want to concatenate two string arrays. Is it possible to concatenate
> them
> gracefully, i.e. without copying each element manually?
>
> TIA,
> Axel Dahmen
>
> PS.: Here's an example of what I am about:
>
> string[] lst1,lst2,ret;
> lst1=Directory.GetFiles("C:\Temp\*.jpg");
> lst2=Directory.GetFiles("C:\Temp\*.gif");
>
> ret=lst1+lst2; // ????
>
>

"Axel Dahmen" <NO_SPAM@No_Spammer_Knows.invalid> wrote in message
news:%23B$(E-Mail Removed)...
> Hi,
>
> I want to concatenate two string arrays. Is it possible to concatenate
them
> gracefully, i.e. without copying each element manually?

I have a set of array utilities, one of which is:

public static System.Array Add( System.Array first, System.Array second )
{
Type type = first.GetType().GetElementType();
System.Array result = System.Array.CreateInstance( type, first.Length +
second.Length );

first.CopyTo( result, 0 );
second.CopyTo( result, first.Length );

return result;
}

Obviously you'll have to cast the return value.

Stu

>
> TIA,
> Axel Dahmen
>
> PS.: Here's an example of what I am about:
>
> string[] lst1,lst2,ret;
> lst1=Directory.GetFiles("C:\Temp\*.jpg");
> lst2=Directory.GetFiles("C:\Temp\*.gif");
>
> ret=lst1+lst2; // ????
>
>