More info on 'using' and resource management

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Ivailo — Thu, 25 Aug 2005 18:03:56 GMT

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re: More info on 'using' and resource management

Qflash — Thu, 09 Jun 2005 13:15:08 GMT

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re: More info on 'using' and resource management

Pilchie (Kevin Pilch-Bisson) — Thu, 12 May 2005 23:37:22 GMT

And the above would only work if the compiler changed the code gen so that the expression and assignment happen inside the try block.

re: More info on 'using' and resource management

Pilchie (Kevin Pilch-Bisson) — Thu, 12 May 2005 23:33:21 GMT

Wait, that won't work. (because the assignment will still not be protected by the finally.

How about:

public delegate T Creator<T>();

public static class ReliableFactory {
public static IDisposable Create<T>(out T temp, Creator<T> create) where T : IDisposable {
try { }
finally {
temp = create();
return null;
}
}
}

class C {
void F() {

using (IDisposable use = null, ignore = ReliableFactory.Create(out use, delegate { new LayoutTransaction(this, this, PropertyNames.Dock); })) {
// stuff.
}
}
}

re: More info on 'using' and resource management

Pilchie (Kevin Pilch-Bisson) — Thu, 12 May 2005 23:22:50 GMT

What about something that took a delegate instead of a where T: new? Then you could use anonymous methods, and locals, etc.

Something like this:

public delegate T Creator<T>();

public static class ReliableFactory {
public static T Create<T>(Creator<T> create) {
try { }
finally {
return create();
}
}
}

class C {
void F() {
using (ReliableFactory.Create(delegate { expression here); })) {
// stuff.
}
}
}