internal static bool IsFilterableColumn(IMetaColumn column, IPrincipal user)
{
DisplayAttribute attribute = column.Attributes.FirstOrDefault <DisplayAttribute>();
if ((attribute != null) && attribute.GetAutoGenerateFilter().HasValue)
{
return(attribute.GetAutoGenerateFilter().Value);
}
if (!string.IsNullOrEmpty(column.FilterUIHint))
{
return(true);
}
if (!column.Scaffold)
{
return(false);
}
if (column.IsCustomProperty)
{
return(false);
}
IMetaForeignKeyColumn column2 = column as IMetaForeignKeyColumn;
if (column2 != null)
{
return(column2.ParentTable.CanRead(user));
}
return((column.ColumnType == typeof(bool)) || (column.GetEnumType() != null));
}
internal static bool IsColumnInDictionary(IMetaColumn column, IDictionary <string, object> values)
{
if (column == null)
{
throw new ArgumentNullException("column");
}
if (values == null)
{
throw new ArgumentNullException("values");
}
IMetaForeignKeyColumn foreignKeyColumn = column as IMetaForeignKeyColumn;
if (foreignKeyColumn != null)
{
return(foreignKeyColumn.ForeignKeyNames.All(fkName => values.ContainsKey(fkName)));
}
return(values.ContainsKey(column.Name));
}
public static IQueryable BuildSortQueryable(IQueryable query, IMetaTable table)
{
IMetaColumn sortColumn = table.SortColumn;
if (sortColumn.IsCustomProperty)
{
// An extra property can't be optimized on server
//
var data = query.OfType <object>().AsEnumerable();
Func <object, object> lambda = row => DataBinder.GetPropertyValue(row, sortColumn.Name);
if (table.SortDescending)
{
query = data.OrderByDescending <object, object>(lambda).AsQueryable();
}
else
{
query = data.OrderBy <object, object>(lambda).AsQueryable();
}
}
else
{
// Build custom expression to optimize sorting on server
//
var parameter = Expression.Parameter(query.ElementType, "row");
LambdaExpression lambda = null;
IMetaForeignKeyColumn foreignKeyColumn = sortColumn as IMetaForeignKeyColumn;
if (foreignKeyColumn != null)
{
// e.g. product => product.Category.CategoryName
var foreignKeySortColumn = foreignKeyColumn.ParentTable.SortColumn;
lambda = Expression.Lambda(Expression.Property(Expression.Property(parameter, sortColumn.Name), foreignKeySortColumn.Name), parameter);
}
else
{
// e.g. product => product.ProductName
lambda = Expression.Lambda(Expression.Property(parameter, sortColumn.Name), parameter);
}
string ordering = table.SortDescending ? "OrderByDescending" : "OrderBy";
var expression = Expression.Call(typeof(Queryable), ordering, new Type[] { query.ElementType, lambda.Body.Type }, query.Expression, lambda);
query = query.Provider.CreateQuery(expression);
}
return(query);
}
private bool IsScaffoldColumn(IMetaColumn column, DataBoundControlMode mode, ContainerType containerType)
{
if (!column.Scaffold)
{
return(false);
}
if (mode == DataBoundControlMode.Insert)
{
IMetaChildrenColumn column3 = column as IMetaChildrenColumn;
if ((column3 != null) && !column3.IsManyToMany)
{
return(false);
}
}
IMetaForeignKeyColumn column2 = column as IMetaForeignKeyColumn;
if ((column2 != null) && !column2.ParentTable.CanRead(this.Context.User))
{
return(false);
}
return(true);
}
