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