/// <summary> Returns true if a member is enabled. </summary>
public static bool IsEnabled(IMemberData property, object instance,
out IMemberData dependentProp, out IComparable dependentValue, out bool hidden)
{
if (property == null)
{
throw new ArgumentNullException(nameof(property));
}
if (instance == null)
{
throw new ArgumentNullException(nameof(instance));
}
ITypeData instanceType = TypeData.GetTypeData(instance);
var dependencyAttrs = property.GetAttributes <EnabledIfAttribute>();
dependentProp = null;
dependentValue = 0;
hidden = false;
bool enabled = true;
foreach (var at in dependencyAttrs)
{
bool newEnabled = true;
dependentProp = instanceType.GetMember(at.PropertyName);
if (dependentProp == null)
{
// We cannot be sure that the step developer has used this attribute correctly
// (could just be a typo in the (weakly typed) property name), thus we need to
// provide a good error message that leads the developer to where the error is.
log.Warning("Could not find property '{0}' on '{1}'. EnabledIfAttribute can only refer to properties of the same class as the property it is decorating.", at.PropertyName, instanceType.Name);
enabled = false;
return(false);
}
var depValue = dependentProp.GetValue(instance);
try
{
newEnabled = calcEnabled(at, depValue);
}
catch (ArgumentException)
{
// CompareTo throws ArgumentException when obj is not the same type as this instance.
newEnabled = false;
}
if (!newEnabled && at.HideIfDisabled)
{
hidden = true;
}
enabled &= newEnabled;
}
return(enabled);
}
