.NET Blog - Chris Frazier Style

Path.GetTempFileName() guarantees that you will get an available name, it does actually go ahead and create the file so it is guaranteed to be yours when you use it. If you strip the extension off and substitute your own you may end up overwriting an existing file. Not a smart thing to do.

Be aware the GetTempFileName() actually creates a zero byte file in the temp folder. Your code will leave the temp file behind in the temp folder. If you use that a lot, you will end up with a lot of files in the temp folder.

string.Format("{0}.{1}", ...);

Wow,
This is such a waste of resource only to concatenate three strings.

How is it such a waste of resource? Enlighten me.

Oops,

Sorry for the long time before answering.
Consider the following code:

using System;
using System.Text;

class Test {

static void Format ()
{
string.Format ("{0}.{1}", "foo", "bar");
}

static void Concat ()
{
string.Concat ("foo", ".", "bar");
}

static void Main ()
{
int run = 100000;

DateTime start = DateTime.Now;
for (int i = 0; i < run; i++)
Format ();
Console.WriteLine ("Format: {0}", (DateTime.Now - start));

start = DateTime.Now;
for (int i = 0; i < run; i++)
Concat ();
Console.WriteLine ("Concat: {0}", (DateTime.Now - start));
}
}

Run it and you'll see that the format takes much more time to do its task (mostly due to parsing).

Jb

:) thanks for enlightening me.

Где-то я это уже видел… А если по теме то спасибо.

"This is such a waste of resource only to concatenate three strings."

string.Format("{0}.{1}", ...);

The resources it uses is negligible.  By this example string.Format should never be used.  

The example is off in that it doesn't take into account the article's context.  I guess it's possible to need 100,000 temporary file names, but there would probably be a slightly better way of doing this (possibly by modifying this function).

In addition, if a dynamic number of runs were made over and over, StringBuilder would be much faster than both examples .  string.Concat will probably win when the number of runs is static (because of the compiler, check the stringbuilder docs), but if it has to figure it out at runtime StringBuilder will win.  

Wow, rather nice article. How will I find that subscription?

Kate  Trider

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Surprisingly! It is like you understand my mind! You seem to know so much about this, just like you wrote the book in it or something. I think that you can do with some pics to drive the content home a bit, but other than that, this is informative blog post. A good read. I’ll definitely revisit again.

Do you have any more info on this?

seems you need a spam tool, that Kate Trider commenting above is pussing some spam link

You live - you see , and tell me .