void UpdateFilterExpression()
{
ISupportFiltering <TEntity> viewModel = this.viewModel as ISupportFiltering <TEntity>;
if (viewModel != null)
{
viewModel.FilterExpression = ActiveFilterItem == null ? null : GetWhereExpression(ActiveFilterItem.FilterCriteria);
}
}
void UpdateFilterExpression()
{
ISupportFiltering <TEntity> viewModel = this.viewModel as ISupportFiltering <TEntity>;
if (viewModel != null && ActiveFilterItem != null)
{
viewModel.FilterExpression = CriteriaOperatorToExpressionConverter.GetGenericWhere <TEntity>(ActiveFilterItem.FilterCriteria);
}
}
public static IQueryable <TQuery> ApplyFilter <TQuery>(this ISupportFiltering filterProvider, IQueryable <TQuery> query)
{
if (filterProvider.Filter == null)
{
return(query);
}
var filters = filterProvider.Filter;
var queryType = typeof(TQuery);
var parameterExpression = Expression.Parameter(typeof(TQuery), "x");
foreach (var filter in filters)
{
var queryProp = queryType.GetProperty(filter.MemberName);
if (queryProp == null)
{
continue;
}
if (queryProp.PropertyType == typeof(string))
{
query = ApplyStringLikeFilter(query, parameterExpression, filter.Value, queryProp);
}
else if (queryProp.PropertyType.IsEnum ||
(queryProp.PropertyType.IsNullableType() && queryProp.PropertyType.GetTypeOfNullable().IsEnum))
{
query = ApplyEnumFilter(query, parameterExpression, filter.Value, queryProp);
}
else
{
query = ApplyPropertyTypeFilter(query, parameterExpression, filter.Value, queryProp);
}
}
return(query);
}
public void ApplyFilter(ISupportFiltering dataSource) => dataSource.FilterAsync(DataFilter.GetFilterExpression());
