CODEWITHSUNDEEP
c#winformsiostream
Uthistran Selvaraj.
Uthistran Selvaraj.

Reputation: 558

Is Stream Binded?

I came across an exception while trying to do my stream to assign to another and dispose it as below

Stream str = new FileStream(somefile, FileMode.OpenOrCreate);
Stream newstr = str;
str.Dispose(); // I disposed only str and not new str

byte[] b = new byte[newstr.Length];// got exception here stating unable to access closed stream...

Why......? I am new to C# and Stream where Stream is in namespace System.IO.

Upvotes: 1

Views: 40

Answers (1)

p.s.w.g
p.s.w.g

Reputation: 149020

Yes, when you call str.Dispose, newStr is also disposed. This is because Stream, like all classes in .NET, are reference types. When you write Stream newstr = str, you are not creating a new Stream, you are simply creating a new reference to the same Stream.

The correct way to write this would be:

Stream str = new FileStream(somefile, FileMode.OpenOrCreate);
int strLen = str.Length;
str.Dispose(); 

byte[] b = new byte[strLen];

This will avoid any ObjectDisposedException's. Note that int is a value type, so when you write int strLen = str.Length you are creating a new copy of the value, and saving it in the variable strLen. So even after the Stream is disposed, you can use that value.

Upvotes: 3

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