FormParameter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / FormParameter.cs / 1 / FormParameter.cs
                        

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

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


 
    /// 
    /// Represents a Parameter that gets its value from the application's form parameters. 
    ///  
    [
    DefaultProperty("FormField"), 
    ]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public class FormParameter : Parameter { 

 
        ///  
        /// Creates an instance of the FormParameter class.
        ///  
        public FormParameter() {
        }

 
        /// 
        /// Creates an instance of the FormParameter class with the specified parameter name and form field. 
        ///  
        public FormParameter(string name, string formField) : base(name) {
            FormField = formField; 
        }


        ///  
        /// Creates an instance of the FormParameter class with the specified parameter name, type, and form field.
        ///  
        public FormParameter(string name, TypeCode type, string formField) : base(name, type) { 
            FormField = formField;
        } 


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


        /// 
        /// The name of the form parameter to get the value from. 
        /// 
        [ 
        DefaultValue(""), 
        WebCategory("Parameter"),
        WebSysDescription(SR.FormParameter_FormField), 
        ]
        public string FormField {
            get {
                object o = ViewState["FormField"]; 
                if (o == null)
                    return String.Empty; 
                return (string)o; 
            }
            set { 
                if (FormField != value) {
                    ViewState["FormField"] = value;
                    OnParameterChanged();
                } 
            }
        } 
 

        ///  
        /// Creates a new FormParameter that is a copy of this FormParameter.
        /// 
        protected override Parameter Clone() {
            return new FormParameter(this); 
        }
 
 
        /// 
        /// Returns the updated value of the parameter. 
        /// 
        protected override object Evaluate(HttpContext context, Control control) {
            if (context == null || context.Request == null) {
                return null; 
            }
            return context.Request.Form[FormField]; 
        } 
    }
}

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