/// <summary>Ensures set contain only elements that are present either in the current columns or in the specified columns, but not both.</summary>
/// <param name="source">The current columns.</param>
/// <param name="other">The columns to compare to the current columns.</param>
/// <returns>A new set if there is any modification to current sealed set; otherwise, the current set.</returns>
public static IColumns SymmetricExcept(this IColumns source, IColumns other)
{
source.VerifyNotNull(nameof(source));
other.VerifyNotNull(nameof(other));
IColumns removedColumnSet = Columns.Empty;
foreach (var column in source)
{
if (other.Contains(column))
{
removedColumnSet = removedColumnSet.Add(column);
source = source.Remove(column);
}
}
foreach (var column in other)
{
if (removedColumnSet.Contains(column))
{
source = source.Add(column);
}
}
return(source);
}
/// <summary>Ensures set contain all elements that are present in either the current columns or in the specified columns.</summary>
/// <param name="source">The current columns.</param>
/// <param name="other">The collection to add elements from.</param>
/// <returns>A new set if there is any modification to current set and current set sealed; otherwise, the current set.</returns>
public static IColumns Union(this IColumns source, IColumns other)
{
source.VerifyNotNull(nameof(source));
other.VerifyNotNull(nameof(other));
foreach (var column in other)
{
source = source.Add(column);
}
return(source);
}
internal void OnValueChanged(Column column)
{
if (IsValueChangedNotificationSuspended)
{
if (_pendingValueChangedColumns != null)
{
_pendingValueChangedColumns = _pendingValueChangedColumns.Add(column);
}
return;
}
NotifyValueChanged(column);
}
/// <summary>
/// Creates a new set of columns.
/// </summary>
/// <param name="values">The value of columns.</param>
/// <returns>The column set.</returns>
public static IColumns New(params Column[] values)
{
values.VerifyNotNull(nameof(values));
if (values.Length == 0)
{
return(Empty);
}
IColumns result = values.VerifyNotNull(0, nameof(values));
for (int i = 1; i < values.Length; i++)
{
result = result.Add(values.VerifyNotNull(i, nameof(values)));
}
return(result);
}