54 lines
1.5 KiB
C#
54 lines
1.5 KiB
C#
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namespace System.Web.UI.WebControls.Expressions {
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using System;
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using System.Collections.ObjectModel;
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using System.ComponentModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Web;
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using System.Web.UI;
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[
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ParseChildren(true, "Expressions"),
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PersistChildren(false)
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]
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public class QueryExpression {
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private HttpContext _context;
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private Control _owner;
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private IQueryableDataSource _dataSource;
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private DataSourceExpressionCollection _expressions;
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[
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PersistenceMode(PersistenceMode.InnerDefaultProperty)
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]
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public DataSourceExpressionCollection Expressions {
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get {
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if (_expressions == null) {
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_expressions = new DataSourceExpressionCollection();
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}
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return _expressions;
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}
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}
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public void Initialize(Control owner, HttpContext context, IQueryableDataSource dataSource) {
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_owner = owner;
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_context = context;
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_dataSource = dataSource;
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Expressions.SetContext(owner, context, dataSource);
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}
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public virtual IQueryable GetQueryable(IQueryable source) {
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if (source == null) {
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return null;
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}
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foreach (DataSourceExpression e in Expressions) {
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source = e.GetQueryable(source) ?? source;
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}
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return source;
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}
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}
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}
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