public void UpdateDifferentReturnsDifferent()
{
MemberAssignment bind = Expression.Bind(typeof(Inner).GetProperty(nameof(Inner.Value)), Expression.Constant(3));
MemberMemberBinding memberBind = Expression.MemberBind(typeof(Outer).GetProperty(nameof(Outer.InnerProperty)), bind);
Assert.NotSame(memberBind, memberBind.Update(new[] { Expression.Bind(typeof(Inner).GetProperty(nameof(Inner.Value)), Expression.Constant(3)) }));
Assert.NotSame(memberBind, memberBind.Update(Enumerable.Empty <MemberBinding>()));
}
public void UpdateDoesntRepeatEnumeration()
{
MemberAssignment bind = Expression.Bind(typeof(Inner).GetProperty(nameof(Inner.Value)), Expression.Constant(3));
MemberMemberBinding memberBind = Expression.MemberBind(typeof(Outer).GetProperty(nameof(Outer.InnerProperty)), bind);
Assert.NotSame(memberBind, memberBind.Update(new RunOnceEnumerable <MemberBinding>(new[] { Expression.Bind(typeof(Inner).GetProperty(nameof(Inner.Value)), Expression.Constant(3)) })));
}
public void UpdateNullThrows()
{
MemberAssignment bind = Expression.Bind(typeof(Inner).GetProperty(nameof(Inner.Value)), Expression.Constant(3));
MemberMemberBinding memberBind = Expression.MemberBind(typeof(Outer).GetProperty(nameof(Outer.InnerProperty)), bind);
AssertExtensions.Throws <ArgumentNullException>("bindings", () => memberBind.Update(null));
}
public void UpdateSameReturnsSame()
{
MemberAssignment bind = Expression.Bind(typeof(Inner).GetProperty(nameof(Inner.Value)), Expression.Constant(3));
MemberMemberBinding memberBind = Expression.MemberBind(typeof(Outer).GetProperty(nameof(Outer.InnerProperty)), bind);
Assert.Same(memberBind, memberBind.Update(Enumerable.Repeat(bind, 1)));
}
protected override MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding node)
{
var changed = false;
var bindings = new MemberBinding[node.Bindings.Count];
for (int i = 0; i < node.Bindings.Count; i++)
{
bindings[i] = VisitMemberBinding(node.Bindings[i]);
changed |= bindings[i] != node.Bindings[i];
}
if (changed)
{
return(node.Update(bindings));
}
return(node);
}
protected override MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding node)
{
var b = Visit(node.Bindings, VisitMemberBinding);
var bindings = (IList <MemberBinding>)b;
var n = node.Bindings.Count;
if (Pop(n, out var ess) && CanEvaluate(node.Member))
{
_tilingState.Push(true);
}
else
{
_tilingState.Push(false);
bindings = Reduce(bindings, ess);
}
return(node.Update(bindings));
}
/// <summary>
/// Visits the children of the <see cref="MemberMemberBinding" />.
/// </summary>
/// <param name="node">The expression to visit.</param>
/// <returns>The modified expression, if it or any subexpression was modified;
/// otherwise, returns the original expression.</returns>
protected virtual MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding node)
{
return(node.Update(Visit(node.Bindings, VisitMemberBinding)));
}
protected override MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding node)
{
return(node.Update(node.Bindings.Select(VisitMemberBinding)));
}
protected override MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding node)
{
var bindings = VisitBindingList(node.Bindings);
return(node.Update(node.Member, bindings));
}
/// <summary>
/// 访问 <see cref="MemberMemberBinding"/>。
/// </summary>
/// <param name="binding"></param>
/// <returns></returns>
protected virtual MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding binding)
{
var bindings = VisitBindingList(binding.Bindings);
return(binding.Update(binding.Member, bindings));
}
protected virtual MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding binding)
{
return(binding.Update(binding.Bindings.Select(b => VisitMemberBinding(b))));
}
protected virtual MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding node, Type expectedType) => node.Update(Visit(node.Bindings, binding => GetMemberType(binding.Member), VisitMemberBinding));