static variables in C#

[Natalia DeBow]

Hi,

I have a quick question. I am using a static variable to hold an instance
of the StreamWriter:
private static StreamWriter sw = File.AppendText("C:\\Temp\\Test.txt");

I am curious to find out how static resources are being disposed in C#. The
problem that I am having is I am opening to a file, write a text message and
then close it. However, if I try to write to the same file again, I
generate an ObjectDisposed exception, since the file was closed and the
FileStream has been disposed. So, I was thinking to let the GC to release
allocated resources and not call on Close method explicitly. But since the
StreamWriter resource that I am using is static, would the GC dispose it?
What is the lifecycle of static variables? What part of the memory do
static variables/methods reside in?

Thanks,
Natalia

[Morten Wennevik]

Hi Natalia,

The static variable is created when the program starts and is destroyed
(collected by GC) when the program ends.
Happy coding!
Morten Wennevik [C# MVP]

[Jon Skeet [C# MVP]]

Natalia DeBow <na***********@unisys.com> wrote:

I have a quick question. I am using a static variable to hold an instance
of the StreamWriter:
private static StreamWriter sw = File.AppendText("C:\\Temp\\Test.txt");

I am curious to find out how static resources are being disposed in C#. The
problem that I am having is I am opening to a file, write a text message and
then close it. However, if I try to write to the same file again, I
generate an ObjectDisposed exception, since the file was closed and the
FileStream has been disposed. So, I was thinking to let the GC to release
allocated resources and not call on Close method explicitly. But since the
StreamWriter resource that I am using is static, would the GC dispose it?
What is the lifecycle of static variables? What part of the memory do
static variables/methods reside in?

The StreamWriter itself isn't static - only the variable is static.
Objects themselves have no notion of being static, public, private,
etc.

Now, your variable will prevent the StreamWriter from being collected
until the AppDomain is unloaded, which is usually at program
termination.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Natalia DeBow]

Thanks so much for your response! I does make a lot more sense now.

Natalia

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