protected override bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
IBindingPathMembers members = _bindingSource.GetPathMembers(throwOnError);
if (!members.AllMembersAvailable)
{
return(false);
}
object penultimateValue = members.PenultimateValue;
IBindingMemberInfo lastMember = members.LastMember;
object oldValue;
object newValue = targetAccessor.GetValue(lastMember, context, throwOnError);
if (lastMember.CanRead && !BindingMemberType.BindingContext.EqualsWithoutNullCheck(lastMember.MemberType))
{
oldValue = lastMember.GetValue(penultimateValue, null);
if (ReferenceEquals(oldValue, newValue) || newValue.IsUnsetValueOrDoNothing())
{
return(false);
}
}
else
{
oldValue = BindingConstants.UnsetValue;
if (newValue.IsUnsetValueOrDoNothing())
{
return(false);
}
}
ValueAccessorChangingEventArgs args = null;
if (ValueChanging != null)
{
args = RaiseValueChanging(context, penultimateValue, lastMember, oldValue, newValue);
if (args != null)
{
if (args.Cancel)
{
return(false);
}
if (!ReferenceEquals(newValue, args.NewValue))
{
newValue = args.NewValue;
if (newValue.IsUnsetValueOrDoNothing())
{
return(false);
}
}
}
}
newValue = BindingServiceProvider.ValueConverter(lastMember, lastMember.Type, newValue);
if (Equals(oldValue, newValue))
{
return(false);
}
if (BindingMemberType.Event.EqualsWithoutNullCheck(lastMember.MemberType))
{
TryRegisterEvent((BindingActionValue)oldValue, newValue, context);
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
else
{
if (_closure != null)
{
_closure.Unsubscribe(false, _isOneTime);
}
lastMember.SetSingleValue(penultimateValue, newValue);
if (ValueChanged != null)
{
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
}
return(true);
}
protected override bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
IBindingPathMembers members = _bindingSource.GetPathMembers(throwOnError);
object penultimateValue = members.PenultimateValue;
if (penultimateValue.IsUnsetValue() || (penultimateValue == null && !members.AllMembersAvailable))
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding cannot set value for path {members.Path.Path}", new object[] { members });
}
return(false);
}
IBindingMemberInfo lastMember = members.LastMember;
object oldValue;
object newValue = targetAccessor.GetValue(lastMember, context, throwOnError);
if (lastMember.CanRead && !BindingMemberType.BindingContext.EqualsWithoutNullCheck(lastMember.MemberType))
{
if (_disableEqualityChecking && !BindingMemberType.Event.EqualsWithoutNullCheck(lastMember.MemberType))
{
oldValue = BindingConstants.UnsetValue;
}
else
{
oldValue = lastMember.GetValue(penultimateValue, null);
}
if (ReferenceEquals(oldValue, newValue) || newValue.IsUnsetValueOrDoNothing())
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding ignores setter because old value: '{oldValue}' equals to new value '{newValue}'", new[] { members, oldValue, newValue });
}
return(false);
}
}
else
{
oldValue = BindingConstants.UnsetValue;
if (newValue.IsUnsetValueOrDoNothing())
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding ignores setter for value '{newValue}'", new[] { members, newValue });
}
return(false);
}
}
ValueAccessorChangingEventArgs args = null;
if (ValueChanging != null)
{
args = RaiseValueChanging(context, penultimateValue, lastMember, oldValue, newValue);
if (args != null)
{
if (args.Cancel)
{
return(false);
}
if (!ReferenceEquals(newValue, args.NewValue))
{
newValue = args.NewValue;
if (newValue.IsUnsetValueOrDoNothing())
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding ignores setter for value '{newValue}'", new[] { members, newValue });
}
return(false);
}
}
}
}
newValue = BindingServiceProvider.ValueConverter(lastMember, lastMember.Type, newValue);
if (Equals(oldValue, newValue))
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding ignores setter because old value: '{oldValue}' equals to new value '{newValue}'", new[] { members, oldValue, newValue });
}
return(false);
}
if (BindingMemberType.Event.EqualsWithoutNullCheck(lastMember.MemberType))
{
TryRegisterEvent((BindingActionValue)oldValue, newValue, context, members);
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
else
{
_closure?.Unsubscribe(false, _isOneTime);
lastMember.SetSingleValue(penultimateValue, newValue);
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding set value: '{newValue}' for source: '{penultimateValue}' with path: '{lastMember.Path}'", new[] { newValue, penultimateValue, lastMember });
}
if (ValueChanged != null)
{
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
}
return(true);
}
protected virtual IBindingMemberInfo GetExplicitBindingMember([NotNull] Type sourceType, [NotNull] string path)
{
path = path.Trim();
string[] indexerArgs = null;
if (path.StartsWith("[", StringComparison.Ordinal) && path.EndsWith("]", StringComparison.Ordinal))
{
indexerArgs = path
.RemoveBounds()
.Split(BindingReflectionExtensions.CommaSeparator, StringSplitOptions.RemoveEmptyEntries);
}
var types = BindingReflectionExtensions.SelfAndBaseTypes(sourceType);
foreach (var type in types)
{
if (indexerArgs == null)
{
PropertyInfo property = type.GetPropertyEx(path, PropertyFlags);
if (property != null)
{
return(new BindingMemberInfo(path, property, sourceType));
}
}
else
{
PropertyInfo candidate = null;
int valueTypeCount = -1;
foreach (var property in type.GetPropertiesEx(PropertyFlags))
{
var indexParameters = property.GetIndexParameters();
if (indexParameters.Length != indexerArgs.Length)
{
continue;
}
try
{
int count = 0;
for (int i = 0; i < indexParameters.Length; i++)
{
var arg = indexerArgs[i];
var paramType = indexParameters[i].ParameterType;
if (arg.StartsWith("\"", StringComparison.Ordinal) && arg.EndsWith("\"", StringComparison.Ordinal))
{
if (paramType != typeof(string))
{
break;
}
}
else
{
BindingServiceProvider.ValueConverter(Empty, paramType, arg);
if (paramType.IsValueType())
{
count++;
}
}
}
if (valueTypeCount < count)
{
candidate = property;
valueTypeCount = count;
}
}
catch
{
;
}
}
if (candidate != null)
{
return(new BindingMemberInfo(path, candidate, sourceType));
}
if (type.IsArray && type.GetArrayRank() == indexerArgs.Length)
{
return(new BindingMemberInfo(path, type));
}
}
EventInfo @event = type.GetEventEx(path, EventFlags);
if (@event != null)
{
return(new BindingMemberInfo(path, @event, null));
}
FieldInfo field = type.GetFieldEx(path, FieldFlags);
if (field != null)
{
return(new BindingMemberInfo(path, field, sourceType));
}
}
if (typeof(IDynamicObject).IsAssignableFrom(sourceType))
{
return(new BindingMemberInfo(path, false));
}
if (typeof(ExpandoObject).IsAssignableFrom(sourceType))
{
return(new BindingMemberInfo(path, true));
}
if (path.EndsWith(AttachedMemberConstants.ChangedEventPostfix, StringComparison.Ordinal))
{
var memberName = path.Substring(0, path.Length - 7);
var member = GetBindingMember(sourceType, memberName, false, false);
if (member != null && member.CanObserve)
{
return(new BindingMemberInfo(path, null, member));
}
}
return(null);
}