protected virtual bool TryAddInternal(T item, out Exception error)
{
error = null;
if (this.IsReadOnly)
{
error = new InvalidOperationException(this.ReadOnlyErrorMessage.ToString());
return(false);
}
if (item == null)
{
error = new ArgumentNullException("item", DataStrings.ErrorCannotAddNullValue);
return(false);
}
if (this.Contains(item))
{
if (!base.CopyChangesOnly)
{
error = new InvalidOperationException(DataStrings.ErrorValueAlreadyPresent(item.ToString()));
}
return(false);
}
ValidationError validationError = this.ValidateValue(item);
if (validationError != null)
{
error = new DataValidationException(validationError);
return(false);
}
base.BeginUpdate();
bool result;
try
{
this.changed = true;
if (!this.IsChangesOnlyCopy)
{
this.propertyValues.Add(item);
}
if (MultiValuedProperty <T> .Contains(this.removed, item, StringComparison.Ordinal))
{
this.removed.Remove(item);
}
else
{
this.added.Add(item);
}
result = true;
}
catch (Exception)
{
this.errorOnUpdate = true;
throw;
}
finally
{
base.EndUpdate();
}
return(result);
}
protected override bool TryAddInternal(T item, out Exception error)
{
if (null == item || base.CopyChangesOnly || this.AutoPromotionDisabled)
{
return(base.TryAddInternal(item, out error));
}
ValidationError validationError = this.ValidateValue(item);
if (validationError != null)
{
error = new DataValidationException(validationError);
return(false);
}
T t = this.FindPrimary(item.Prefix);
if (null == t || t == item)
{
item = (T)((object)item.ToPrimary());
return(base.TryAddInternal(item, out error));
}
base.BeginUpdate();
bool result;
try
{
T t2 = (T)((object)item.ToSecondary());
bool flag = base.TryAddInternal(t2, out error);
if (flag && item.IsPrimaryAddress)
{
this.MakePrimary(t2);
}
result = flag;
}
finally
{
base.EndUpdate();
}
return(result);
}
