protected internal Expression CompileAccessorExpression(Expression target, string clientExpr, Action <List <Expression> > customizeProgression = null, bool liftToNullable = false)
{
var progression = new List <Expression> {
target
};
var clientExprItems = clientExpr.Split('.');
var currentTarget = target;
for (var i = 0; i < clientExprItems.Length; i++)
{
var clientExprItem = clientExprItems[i];
if (i == 0 && clientExprItem == "this")
{
continue;
}
if (Utils.IsNullable(currentTarget.Type))
{
clientExprItem = "Value";
i--;
}
if (currentTarget.Type == typeof(ExpandoObject))
{
currentTarget = ReadExpando(currentTarget, clientExprItem);
}
else if (DynamicBindingHelper.ShouldUseDynamicBinding(currentTarget.Type))
{
currentTarget = DynamicBindingHelper.CompileGetMember(currentTarget, clientExprItem);
}
else
{
currentTarget = Expression.PropertyOrField(currentTarget, clientExprItem);
}
progression.Add(currentTarget);
}
customizeProgression?.Invoke(progression);
if (_guardNulls && progression.Count > 1 || liftToNullable && progression.Count > 2)
{
var lastIndex = progression.Count - 1;
var last = progression[lastIndex];
if (Utils.CanAssignNull(target.Type) && !Utils.CanAssignNull(last.Type))
{
progression[lastIndex] = Expression.Convert(last, typeof(Nullable <>).MakeGenericType(last.Type));
}
}
return(CompileNullGuard(progression));
}
protected internal Expression CompileAccessorExpression(Expression target, string clientExpr, bool forceToString = false)
{
if (clientExpr == "this")
{
return(target);
}
var progression = new List <Expression>();
progression.Add(target);
var clientExprItems = clientExpr.Split('.');
var currentTarget = target;
for (var i = 0; i < clientExprItems.Length; i++)
{
var clientExprItem = clientExprItems[i];
if (Utils.IsNullable(currentTarget.Type))
{
clientExprItem = "Value";
i--;
}
if (DynamicBindingHelper.ShouldUseDynamicBinding(currentTarget.Type))
{
currentTarget = DynamicBindingHelper.CompileGetMember(currentTarget, clientExpr);
}
else
{
currentTarget = Expression.PropertyOrField(currentTarget, clientExprItem);
}
progression.Add(currentTarget);
}
if (forceToString && currentTarget.Type != typeof(String))
{
progression.Add(Expression.Call(currentTarget, typeof(Object).GetMethod(nameof(Object.ToString))));
}
return(CompileNullGuard(progression));
}
