public void UsingException()
{
var disposable = new Disposable();
var d = Expression.Parameter(typeof(Disposable), "d");
var disposer = Expression.Lambda <Action <Disposable> > (
CustomExpression.Using(
d,
Expression.Block(
Expression.Throw(Expression.New(typeof(TestUsingException))),
Expression.Call(d, typeof(Disposable).GetMethod("Touch")))),
d).Compile();
Assert.IsFalse(disposable.Touched);
Assert.IsFalse(disposable.Disposed);
try {
disposer(disposable);
Assert.Fail();
} catch (TestUsingException) {}
Assert.IsFalse(disposable.Touched);
Assert.IsTrue(disposable.Disposed);
}
public UsingExpression Update(ParameterExpression variable, Expression disposable, Expression body)
{
if (this.variable == variable && this.disposable == disposable && this.body == body)
{
return(this);
}
return(CustomExpression.Using(variable, disposable, body));
}
public void Using()
{
var arg = Expression.Parameter(typeof(IDisposable), "arg");
var lambda = Expression.Lambda <Action <IDisposable> > (
CustomExpression.Using(
arg,
Expression.Call(typeof(Console).GetMethod("WriteLine", new [] { typeof(object) }), arg)),
arg);
AssertExpression(@"
void (IDisposable arg)
{
using (arg)
{
Console.WriteLine(arg);
}
}
", lambda);
}
public void Using()
{
var disposable = new Disposable();
var d = Expression.Parameter(typeof(Disposable), "d");
var disposer = Expression.Lambda <Action <Disposable> > (
CustomExpression.Using(
d,
Expression.Block(
Expression.Call(d, typeof(Disposable).GetMethod("Touch")))),
d).Compile();
Assert.IsFalse(disposable.Touched);
Assert.IsFalse(disposable.Disposed);
disposer(disposable);
Assert.IsTrue(disposable.Touched);
Assert.IsTrue(disposable.Disposed);
}