public void WhileBreakContinue()
{
var counter = new Counter();
var c = Expression.Parameter(typeof(Counter), "c");
var i = Expression.Parameter(typeof(int), "i");
var l = Expression.Parameter(typeof(int), "l");
var loop_break = Expression.Label("for_break");
var loop_continue = Expression.Label("for_continue");
var hitcounter = Expression.Lambda <Action <Counter, int, int> > (
CustomExpression.While(
Expression.LessThan(i, l),
Expression.Block(
Expression.Condition(
Expression.LessThan(i, Expression.Constant(10)),
Expression.Block(
Expression.Call(c, typeof(Counter).GetMethod("Hit", Type.EmptyTypes)),
Expression.PostIncrementAssign(i),
Expression.Goto(loop_continue)),
Expression.Goto(loop_break))),
loop_break,
loop_continue),
c, i, l).Compile();
hitcounter(counter, 0, 100);
Assert.AreEqual(10, counter.Count);
}
public WhileExpression Update(Expression test, Expression body, LabelTarget breakTarget, LabelTarget continueTarget)
{
if (this.test == test && this.body == body && this.break_target == breakTarget && this.continue_target == continueTarget)
{
return(this);
}
return(CustomExpression.While(test, body, breakTarget, continueTarget));
}
public void WhileFalse()
{
var counter = new Counter();
var c = Expression.Parameter(typeof(Counter), "c");
var i = Expression.Parameter(typeof(int), "i");
var l = Expression.Parameter(typeof(int), "l");
var hitcounter = Expression.Lambda <Action <Counter, int, int> > (
CustomExpression.While(
Expression.LessThan(i, l),
Expression.Block(
Expression.Call(c, typeof(Counter).GetMethod("Hit", Type.EmptyTypes)),
Expression.PreIncrementAssign(i))
),
c, i, l).Compile();
hitcounter(counter, 100, 10);
Assert.AreEqual(0, counter.Count);
}
public void While()
{
var i = Expression.Parameter(typeof(int), "i");
var l = Expression.Parameter(typeof(int), "l");
var lambda = Expression.Lambda <Action <int, int> > (
CustomExpression.While(
Expression.LessThan(i, l),
Expression.Block(
Expression.Call(typeof(Console).GetMethod("WriteLine", new [] { typeof(int) }), Expression.PostIncrementAssign(i)))),
i, l);
AssertExpression(@"
void (int i, int l)
{
while (i < l)
{
Console.WriteLine(i++);
}
}
", lambda);
}