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using System.Collections.Generic;
using System.Globalization;
using System.Web.DynamicData.Util;
using System.Web.Resources;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace System.Web.DynamicData {
/// <summary>
/// DynamicQueryStringParameter allows a datasource to have its primary key easily fed from the query string.
/// It does not require any attributes, and works even for multi-part primary keys.
/// </summary>
public class DynamicQueryStringParameter : Parameter, IWhereParametersProvider {
/// <summary>
/// See IWhereParametersProvider.GetWhereParameters
/// </summary>
public virtual IEnumerable<Parameter> GetWhereParameters(IDynamicDataSource dataSource) {
var table = MetaTableHelper.GetTableWithFullFallback(dataSource, HttpContext.Current.ToWrapper());
// check makes no sense as the above call will throw
//if (table == null) {
// return new Parameter[0];
//}
return RouteParametersHelper.GetColumnParameters(table, Name);
}
/// <summary>
/// same as base
/// </summary>
/// <param name="context"></param>
/// <param name="control"></param>
/// <returns></returns>
protected override object Evaluate(HttpContext context, Control control) {
// If this gets called, it means we never had a chance to expand the parameter. Give an error
// telling the user to use a DynamicDataManager
throw new InvalidOperationException(String.Format(
CultureInfo.CurrentCulture, DynamicDataResources.DynamicParameter_NeedExpansion, typeof(DynamicQueryStringParameter).Name));
}
}
}
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