public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (!(value is ComparisonOperators))
{
return(String.Empty);
}
return(ComparisonOperatorNode.OperatorToString((ComparisonOperators)value));
}
/// <summary>
/// Получить строковое выражение фильтрации
/// </summary>
/// <param name="filterElement">Параметры фильтра</param>
/// <param name="filterablePropertyDescription">Описание свойств фильтрации</param>
/// <returns>Строковое выражение фильтрации</returns>
private string GetStringFilteringConditions(ExpressionTreeElement filterElement, FilterablePropertyDescriptionCollection filterablePropertyDescription)
{
var fieldLeaf = filterElement as ExpressionTreeFieldLeaf;
if (fieldLeaf != null)
{
var foundFieldDescr =
filterablePropertyDescription.FirstOrDefault(
prop => prop.BoundProperty.Equals(fieldLeaf.PropertyDescription));
if (foundFieldDescr != null)
{
return(foundFieldDescr.Title);
}
}
var valueLeaf = filterElement as ExpressionTreeValueLeaf;
if (valueLeaf != null)
{
var fieldForValue = filterElement.Parent.Left as ExpressionTreeFieldLeaf;
if (fieldForValue != null)
{
var foundFieldDescr =
filterablePropertyDescription.FirstOrDefault(
prop => prop.BoundProperty.Equals(fieldForValue.PropertyDescription));
if (foundFieldDescr != null &&
foundFieldDescr.ValueToStringConverter != null)
{
return(foundFieldDescr.ValueToStringConverter.Convert(valueLeaf.FieldValue,
valueLeaf.FieldValue.GetType(), null, CultureInfo.CurrentCulture).ToString());
}
}
if (valueLeaf.FieldValue is string)
{
return("\"" + valueLeaf.FieldValue + "\"");
}
if (valueLeaf.FieldValue is DateTime)
{
return("\"" + ((DateTime)valueLeaf.FieldValue).ToString(CultureInfo.CurrentCulture) + "\"");
}
if (valueLeaf.FieldValue == null)
{
return(LocalizationDictionary.Empty);
}
else
{
return(valueLeaf.FieldValue.ToString());
}
}
var comparisonNode = filterElement as ComparisonOperatorNode;
if (comparisonNode != null)
{
if (comparisonNode.Right is ExpressionTreeValueLeaf)
{
if (((ExpressionTreeValueLeaf)comparisonNode.Right).FieldValue == null ||
(((ExpressionTreeValueLeaf)comparisonNode.Right).FieldValue is String &&
String.IsNullOrEmpty(((ExpressionTreeValueLeaf)comparisonNode.Right).FieldValue as String)))
{
return(GetStringFilteringConditions(comparisonNode.Left, filterablePropertyDescription)
+ " " + ComparisonOperatorNode.OperatorToString(comparisonNode.Operator) + " "
+ LocalizationDictionary.Empty);
}
return(GetStringFilteringConditions(comparisonNode.Left, filterablePropertyDescription)
+ " " + ComparisonOperatorNode.OperatorToString(comparisonNode.Operator) + " "
+ GetStringFilteringConditions(comparisonNode.Right, filterablePropertyDescription));
}
}
var booleanNode = filterElement as BooleanOperatorNode;
if (booleanNode != null)
{
var boolOperatorItemsSource = new LocalizableEnumItemsSource {
Type = typeof(BooleanOperators)
};
if (booleanNode.Operator == BooleanOperators.Not)
{
return(boolOperatorItemsSource.Convert(booleanNode.Operator, null, null, null) + " "
+ (booleanNode.Left is BooleanOperatorNode ? "( " : String.Empty)
+ GetStringFilteringConditions(booleanNode.Left, filterablePropertyDescription)
+ (booleanNode.Left is BooleanOperatorNode ? " )" : String.Empty));
}
return(GetStringFilteringConditions(booleanNode.Left, filterablePropertyDescription)
+ " " + boolOperatorItemsSource.Convert(booleanNode.Operator, null, null, null) + " "
+ GetStringFilteringConditions(booleanNode.Right, filterablePropertyDescription));
}
return(String.Empty);
}