private List <TItem> ApplyFilter <TItem>(IFilterOperation filterOperation, string operand, IEnumerable <TItem> items)
{
var dataSchema = new DataSchema();
var columnDescriptor = ColumnDescriptor.RootColumn(dataSchema, typeof(TItem));
if (null == operand)
{
Assert.IsNull(filterOperation.GetOperandType(columnDescriptor));
}
else
{
Assert.IsNotNull(filterOperation.GetOperandType(columnDescriptor));
}
var predicate = filterOperation.MakePredicate(columnDescriptor, operand);
return(items.Where(item => predicate(item)).ToList());
}
private List <TItem> ApplyFilter <TItem>(IFilterOperation filterOperation, string operand, IEnumerable <TItem> items)
{
var dataSchema = new DataSchema(new DataSchemaLocalizer(CultureInfo.CurrentCulture));
var columnDescriptor = ColumnDescriptor.RootColumn(dataSchema, typeof(TItem));
if (null != operand)
{
Assert.IsNotNull(filterOperation.GetOperandType(columnDescriptor));
}
var filterPredicate = FilterPredicate.CreateFilterPredicate(dataSchema, typeof(TItem), filterOperation, operand);
var predicate = filterPredicate.MakePredicate(dataSchema, typeof(TItem));
return(items.Where(item => predicate(item)).ToList());
}
/// <summary>
/// Constructs a new FilterPredicate from a value that the user has typed in the user interface.
/// "operandText" is expected to be formatted according to the locale settings of "dataSchema".
/// </summary>
public static FilterPredicate CreateFilterPredicate(DataSchema dataSchema, Type columnType, IFilterOperation filterOperation, string operandText)
{
object operandValue;
if (string.IsNullOrEmpty(operandText))
{
operandValue = null;
}
else
{
Type operandType = filterOperation.GetOperandType(dataSchema, columnType);
if (null == operandType)
{
operandValue = null;
}
else
{
operandValue = ParseOperandValue(dataSchema.DataSchemaLocalizer.FormatProvider, operandType, operandText);
}
}
string invariantOperandText = OperandValueToString(CultureInfo.InvariantCulture, operandValue);
return(new FilterPredicate(filterOperation, invariantOperandText));
}
