Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / UI / WebControls / Expressions / OfTypeExpression.cs / 1305376 / OfTypeExpression.cs
#if ORYX_VNEXT namespace Microsoft.Web.Data.UI.WebControls.Expressions { #else namespace System.Web.UI.WebControls.Expressions { #endif using System.ComponentModel; using System.Diagnostics; using System.Globalization; using System.Linq; using System.Linq.Expressions; using System.Reflection; using System.Web.Compilation; using System.Web.Resources; using System; using System.Web.UI; public class OfTypeExpression : DataSourceExpression { private MethodInfo _ofTypeMethod; private string _typeName; private MethodInfo OfTypeMethod { get { if (_ofTypeMethod == null) { var type = GetType(TypeName); _ofTypeMethod = GetOfTypeMethod(type); } return _ofTypeMethod; } } [DefaultValue("")] public string TypeName { get { return _typeName ?? String.Empty; } set { if (TypeName != value) { _typeName = value; _ofTypeMethod = null; } } } public OfTypeExpression() { } public OfTypeExpression(Type type) { if (type == null) { throw new ArgumentNullException("type"); } TypeName = type.AssemblyQualifiedName; _ofTypeMethod = GetOfTypeMethod(type); } // internal for unit testing internal OfTypeExpression(Control owner) : base(owner) { } private Type GetType(string typeName) { if (String.IsNullOrEmpty(typeName)) { throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, AtlasWeb.OfTypeExpression_TypeNameNotSpecified, Owner.ID)); } try { return BuildManager.GetType(typeName, true /* throwOnError */, true /* ignoreCase */); } catch (Exception e) { throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, AtlasWeb.OfTypeExpression_CannotFindType, typeName, Owner.ID), e); } } private static MethodInfo GetOfTypeMethod(Type type) { Debug.Assert(type != null); return typeof(Queryable).GetMethod("OfType").MakeGenericMethod(new Type[] { type }); } public override IQueryable GetQueryable(IQueryable query) { return query.Provider.CreateQuery(Expression.Call(null, OfTypeMethod, query.Expression)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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