SessionParameter.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / xsp / System / Web / UI / WebControls / SessionParameter.cs / 2 / SessionParameter.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.ComponentModel; 
    using System.Data;
    using System.Security.Permissions;

 

    ///  
    /// Represents a Parameter that gets its value from the application's session state. 
    /// 
    [ 
    DefaultProperty("SessionField"),
    ]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public class SessionParameter : Parameter {
 
 
        /// 
        /// Creates an instance of the SessionParameter class. 
        /// 
        public SessionParameter() {
        }
 

        ///  
        /// Creates an instance of the SessionParameter class with the specified parameter name, and session field. 
        /// 
        public SessionParameter(string name, string sessionField) : base(name) { 
            SessionField = sessionField;
        }

 
        /// 
        /// Creates an instance of the SessionParameter class with the specified parameter name, database type, and 
        /// session field. 
        /// 
        public SessionParameter(string name, DbType dbType, string sessionField) 
            : base(name, dbType) {
            SessionField = sessionField;
        }
 

        ///  
        /// Creates an instance of the SessionParameter class with the specified parameter name, type, and session field. 
        /// 
        public SessionParameter(string name, TypeCode type, string sessionField) : base(name, type) { 
            SessionField = sessionField;
        }

 
        /// 
        /// Used to clone a parameter. 
        ///  
        protected SessionParameter(SessionParameter original) : base(original) {
            SessionField = original.SessionField; 
        }


 
        /// 
        /// The name of the session variable to get the value from. 
        ///  
        [
        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();
                } 
            } 
        }
 

        /// 
        /// Creates a new SessionParameter that is a copy of this SessionParameter.
        ///  
        protected override Parameter Clone() {
            return new SessionParameter(this); 
        } 

 
        /// 
        /// Returns the updated value of the parameter.
        /// 
        protected override object Evaluate(HttpContext context, Control control) { 
            if (context == null || context.Session == null) {
                return null; 
            } 
            return context.Session[SessionField];
        } 
    }
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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