Resource Cleanup and Lambda Expressions

A neat way of always cleaning up resources is to use Lambdas as data.

Take the following

Source

[code:c#]

internal interface ITryCatchReport
{
void Try(Action action);
}

internal class TryCatchReport : ITryCatchReport
{
public TryCatchReport(IServer server)
{
_server = server;
}

public void Try(Action action)
{
try
{
action(_server);
}
catch (Exception e)
{
Trace.WriteLine(e.Message);
// Clean up resources
// Report errors
}
}

private IServer _server;
}

[/code]

Usage

[code:c#]

TryCatchReport safeInvoker = new TryCatchReport(_data.Server);
safeInvoker.Try(x =>
{
x.MakeInterfaceCall();
});

[/code]

We are now guaranteed that in the case of an exception that the resources will get cleaned up.

Usage with code blocks

If you wish to execute many statements in the action look at this sample.

[code:c#]

private List GetActionDefinitions()
{
if (_actionDefinitions == null)
{
safeInvoker.Try(x =>
{
x.Do1();
x.DoSomething();
OtherFunc();
});
}

return _actionDefinitions;
}

[/code]