Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/WebControls/SessionParameter.cs

@@ -0,0 +1,109 @@
+//------------------------------------------------------------------------------
+// <copyright file="SessionParameter.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls {
+
+    using System;
+    using System.ComponentModel;
+    using System.Data;
+
+
+
+    /// <devdoc>
+    /// Represents a Parameter that gets its value from the application's session state.
+    /// </devdoc>
+    [
+    DefaultProperty("SessionField"),
+    ]
+    public class SessionParameter : Parameter {
+
+
+        /// <devdoc>
+        /// Creates an instance of the SessionParameter class.
+        /// </devdoc>
+        public SessionParameter() {
+        }
+
+
+        /// <devdoc>
+        /// Creates an instance of the SessionParameter class with the specified parameter name, and session field.
+        /// </devdoc>
+        public SessionParameter(string name, string sessionField) : base(name) {
+            SessionField = sessionField;
+        }
+
+
+        /// <devdoc>
+        /// Creates an instance of the SessionParameter class with the specified parameter name, database type, and
+        /// session field.
+        /// </devdoc>
+        public SessionParameter(string name, DbType dbType, string sessionField)
+            : base(name, dbType) {
+            SessionField = sessionField;
+        }
+
+
+        /// <devdoc>
+        /// Creates an instance of the SessionParameter class with the specified parameter name, type, and session field.
+        /// </devdoc>
+        public SessionParameter(string name, TypeCode type, string sessionField) : base(name, type) {
+            SessionField = sessionField;
+        }
+
+
+        /// <devdoc>
+        /// Used to clone a parameter.
+        /// </devdoc>
+        protected SessionParameter(SessionParameter original) : base(original) {
+            SessionField = original.SessionField;
+        }
+
+
+
+        /// <devdoc>
+        /// The name of the session variable to get the value from.
+        /// </devdoc>
+        [
+        DefaultValue(""),
+        WebCategory("Parameter"),
+        WebSysDescription(SR.SessionParameter_SessionField),
+        ]
+        public string SessionField {
+            get {
+                object o = ViewState["SessionField"];
+                if (o == null)
+                    return String.Empty;
+                return (string)o;
+            }
+            set {
+                if (SessionField != value) {
+                    ViewState["SessionField"] = value;
+                    OnParameterChanged();
+                }
+            }
+        }
+
+
+        /// <devdoc>
+        /// Creates a new SessionParameter that is a copy of this SessionParameter.
+        /// </devdoc>
+        protected override Parameter Clone() {
+            return new SessionParameter(this);
+        }
+
+
+        /// <devdoc>
+        /// Returns the updated value of the parameter.
+        /// </devdoc>
+        protected internal override object Evaluate(HttpContext context, Control control) {
+            if (context == null || context.Session == null) {
+                return null;
+            }
+            return context.Session[SessionField];
+        }
+    }
+}
+