53 lines
1.9 KiB
C#
53 lines
1.9 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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using System.Web.DynamicData.Util;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Diagnostics;
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using System.Web.UI.WebControls.Expressions;
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namespace System.Web.DynamicData {
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/// <summary>
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/// This class is an QueryExtender-based equivalent of DynamicQueryStringParameters.
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/// When applied to a data source it will filter the data by the value of a primary key encoded
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/// in the requests query string (or potentially routing if complex routes are used). If ColumnName
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/// is specified it will retrieve the values
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/// </summary>
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public class DynamicRouteExpression : DataSourceExpression {
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private PropertyExpression _expression = new PropertyExpression();
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/// <summary>
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/// An optional column name that can be used to change the filtering mode (i.e. filter by foreign key instead
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/// of primary key).
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/// </summary>
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[DefaultValue("")]
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public string ColumnName { get; set; }
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/// <summary>
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/// See base class.
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/// </summary>
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public override void SetContext(Control owner, HttpContext context, IQueryableDataSource dataSource) {
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base.SetContext(owner, context, dataSource);
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owner.Page.InitComplete += new EventHandler(Page_InitComplete);
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}
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void Page_InitComplete(object sender, EventArgs e) {
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Debug.Assert(DataSource != null);
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var table = DataSource.GetMetaTable();
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IEnumerable<Parameter> parameters = RouteParametersHelper.GetColumnParameters(table, ColumnName);
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parameters.ToList().ForEach(p => _expression.Parameters.Add(p));
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}
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/// <summary>
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/// See base class.
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/// </summary>
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public override IQueryable GetQueryable(IQueryable source) {
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return _expression.GetQueryable(source);
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}
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}
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}
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