Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.Extensions/ui/WebControls/Expressions/PropertyExpression.cs

@@ -0,0 +1,42 @@
+namespace System.Web.UI.WebControls.Expressions {
+    using System;
+    using System.Collections.Generic;
+    using System.Security.Permissions;
+    using System.Web.UI;
+    using System.Linq.Expressions;
+    using System.Linq;
+
+    public class PropertyExpression : ParameterDataSourceExpression {
+        public override IQueryable GetQueryable(IQueryable source) {
+            if (source == null) {
+                return null;
+            }
+
+            IDictionary<string, object> values = GetValues();
+            List<Expression> equalsExpressions = new List<Expression>();
+            ParameterExpression parameterExpression = Expression.Parameter(source.ElementType, String.Empty);
+
+            foreach (KeyValuePair<string, object> pair in values) {
+                if (!String.IsNullOrEmpty(pair.Key)) {
+                    // Create the property expression
+                    Expression property = ExpressionHelper.CreatePropertyExpression(parameterExpression, pair.Key);
+                    // Get the value
+                    object value = ExpressionHelper.BuildObjectValue(pair.Value, property.Type);
+                    // Create Property == Value and '&&' the expressions together
+                    if (value != null) {
+                        Expression valueExpression = Expression.Constant(value, property.Type);
+                        Expression equalsExpression = Expression.Equal(property, valueExpression);
+                        equalsExpressions.Add(equalsExpression);
+                    }
+                }
+            }
+
+            if (equalsExpressions.Any()) {
+                Expression body = ExpressionHelper.And(equalsExpressions);
+                return ExpressionHelper.Where(source, Expression.Lambda(body, parameterExpression));
+            }
+
+            return source;
+        }
+    }
+}