// called by ObjectDataSource - set sort, grouping and filter info before calling load
internal EntityQueryPagedCollectionView(EntityQuery query, int pageSize, int loadSize,
SortDescriptionCollection sortDescriptors, ObservableCollection<GroupDescription> groupDescriptors, IPredicateDescription filter)
: this(query, pageSize, loadSize, true, false) {
sortDescriptors.ForEach(d => SortDescriptions.Add(d));
groupDescriptors.ForEach(d=> GroupDescriptions.Add(d));
SetQueryFilter(filter);
Refresh();
}
public Predicate <object> Convert(IPredicateDescription predicateDescription)
{
// Visit adds coalesce operator where needed
var initExpr = predicateDescription.ToLambdaExpression();
//var log1 = IdeaBlade.Linq.ExpressionVisitor.GetLog(initExpr);
var expr = base.Visit(initExpr);
//var log2 = IdeaBlade.Linq.ExpressionVisitor.GetLog(expr);
// Now convert to Predicate<object>
var parmExpr = LE.Expression.Parameter(typeof(Object));
var castExpr = LE.Expression.Convert(parmExpr, predicateDescription.InstanceType);
var invokeExpr = LE.Expression.Invoke(expr, castExpr);
var lambdaExpr = LE.Expression.Lambda(invokeExpr, parmExpr);
var func = (Func <Object, bool>)lambdaExpr.Compile();
return((Object o) => func(o));
}
public Predicate<object> Convert(IPredicateDescription predicateDescription) {
// Visit adds coalesce operator where needed
var initExpr = predicateDescription.ToLambdaExpression();
//var log1 = IdeaBlade.Linq.ExpressionVisitor.GetLog(initExpr);
var expr = base.Visit(initExpr);
//var log2 = IdeaBlade.Linq.ExpressionVisitor.GetLog(expr);
// Now convert to Predicate<object>
var parmExpr = LE.Expression.Parameter(typeof(Object));
var castExpr = LE.Expression.Convert(parmExpr, predicateDescription.InstanceType);
var invokeExpr = LE.Expression.Invoke(expr, castExpr);
var lambdaExpr = LE.Expression.Lambda(invokeExpr, parmExpr);
var func = (Func<Object, bool>)lambdaExpr.Compile();
return (Object o) => func(o);
}
/// <summary>
/// Set a filter for this view.
/// </summary>
/// <param name="predicateDescription"></param>
/// <remarks>
/// The filter can be a simple or composite predicate. See the
/// <see cref="PredicateDescription"/> and <see cref="PredicateBuilder"/>
/// for more information on building dynamic filter criteria.
/// <para>
/// After setting the filter, call <see cref="Refresh"/> to re-query and
/// load the view.
/// </para>
/// </remarks>
public void SetQueryFilter(IPredicateDescription predicateDescription) {
if (predicateDescription != null) {
_filterExpression = predicateDescription.ToLambdaExpression();
} else {
_filterExpression = null;
}
}
