public void UpdateNullThrows()
{
MemberListBinding binding = Expression.ListBind(
typeof(ListWrapper <int>).GetProperty(nameof(ListWrapper <int> .ListProperty)),
Enumerable.Range(0, 3)
.Select(i => Expression.ElementInit(typeof(List <int>).GetMethod("Add"), Expression.Constant(i))));
Assert.Throws <ArgumentNullException>("initializers", () => binding.Update(null));
}
public void UpdateSameReturnsSame()
{
ElementInit[] initializers = Enumerable.Range(0, 3)
.Select(i => Expression.ElementInit(typeof(List <int>).GetMethod("Add"), Expression.Constant(i)))
.ToArray();
MemberListBinding binding = Expression.ListBind(
typeof(ListWrapper <int>).GetProperty(nameof(ListWrapper <int> .ListProperty)), initializers);
Assert.Same(binding, binding.Update(initializers));
}
protected override MemberListBinding VisitMemberListBinding(MemberListBinding node)
{
var changed = false;
var initializers = new ElementInit[node.Initializers.Count];
for (int i = 0; i < node.Initializers.Count; i++)
{
initializers[i] = VisitElementInit(node.Initializers[i]);
changed |= initializers[i] != node.Initializers[i];
}
if (changed)
{
return(node.Update(initializers));
}
return(node);
}
public void UpdateDoesntRepeatEnumeration()
{
MemberListBinding binding = Expression.ListBind(
typeof(ListWrapper <int>).GetProperty(nameof(ListWrapper <int> .ListProperty)),
Enumerable.Range(0, 3)
.Select(i => Expression.ElementInit(typeof(List <int>).GetMethod("Add"), Expression.Constant(i))));
Assert.NotSame(
binding,
binding.Update(
new RunOnceEnumerable <ElementInit>(
new[]
{
Expression.ElementInit(
typeof(List <int>).GetMethod(nameof(List <int> .Add)), Expression.Constant(1))
})));
}
protected override MemberListBinding VisitMemberListBinding(MemberListBinding node)
{
var a = Visit(node.Initializers, VisitElementInit);
var inits = (IList <ElementInit>)a;
var n = node.Initializers.Count;
if (Pop(n, out var ess) && CanEvaluate(node.Member))
{
_tilingState.Push(true);
}
else
{
_tilingState.Push(false);
inits = Reduce(inits, ess);
}
return(node.Update(inits));
}
/// <summary>
/// Visits the children of the <see cref="MemberListBinding" />.
/// </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 MemberListBinding VisitMemberListBinding(MemberListBinding node)
{
return(node.Update(Visit(node.Initializers, VisitElementInit)));
}
protected override MemberListBinding VisitMemberListBinding(MemberListBinding node)
{
return(node.Update(node.Initializers.Select(o => o.Update(o.Arguments.Select(VisitInternal)))));
}
protected override MemberListBinding VisitMemberListBinding(MemberListBinding node)
{
var initializers = VisitElementInitializerList(node.Initializers);
return(node.Update(node.Member, initializers));
}
/// <summary>
/// 访问 <see cref="MemberListBinding"/>。
/// </summary>
/// <param name="binding"></param>
/// <returns></returns>
protected virtual MemberListBinding VisitMemberListBinding(MemberListBinding binding)
{
var initializers = VisitElementInitializerList(binding.Initializers);
return(binding.Update(binding.Member, initializers));
}
protected virtual MemberListBinding VisitMemberListBinding(MemberListBinding binding)
{
return(binding.Update(binding.Initializers.Select(i => VisitElementInit(i))));
}
protected virtual MemberListBinding VisitMemberListBinding(MemberListBinding node, Type expectedType) => node.Update(Visit(node.Initializers, init => null, VisitElementInit));
