public static DataColumn[] GetColumnsWithExtendedPropertyValue(DataColumn[] columns, string propertyName,
object propertyValue, ColumnPropertyComparer comparer)
{
var list = new ArrayList();
foreach (var t in columns)
{
var currentValue = t.ExtendedProperties[propertyName];
if (currentValue == null) continue;
if (comparer(propertyValue, currentValue))
list.Add(t);
}
var cols = new DataColumn[list.Count];
for (var i = 0; i < cols.Length; i++) cols[i] = list[i] as DataColumn;
return cols;
}
public static bool DataColumnHasExtendedProperty(DataColumn column, string propertyName, object propertyValue,
ColumnPropertyComparer comparer)
{
var obj = column.ExtendedProperties[propertyName];
return obj != null && comparer(obj, propertyValue);
}