RadioButtonList.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / RadioButtonList.cs / 1477082 / RadioButtonList.cs
                        

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

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections.Specialized; 
    using System.ComponentModel;
    using System.Globalization;
    using System.Web;
    using System.Web.UI; 
    using System.Web.Util;
 
    ///  
    ///    Generates a single-selection radio button group and
    ///       defines its properties. 
    /// 
    [
    ValidationProperty("SelectedItem"),
    SupportsEventValidation, 
    ]
    public class RadioButtonList : ListControl, IRepeatInfoUser, INamingContainer, IPostBackDataHandler { 
 
        RadioButton _controlToRepeat;
        private bool _cachedIsEnabled; 
        private bool _cachedRegisterEnabled;
        private int _offset;

        public RadioButtonList() { 
            _offset = 0;
        } 
 

        ///  
        ///  CellPadding property.
        ///  The padding between each item.
        /// 
        [ 
        WebCategory("Layout"),
        DefaultValue(-1), 
        WebSysDescription(SR.RadioButtonList_CellPadding) 
        ]
        public virtual int CellPadding { 
            get {
                if (ControlStyleCreated == false) {
                    return -1;
                } 
                return ((TableStyle)ControlStyle).CellPadding;
            } 
            set { 
                ((TableStyle)ControlStyle).CellPadding = value;
            } 
        }


        ///  
        ///  CellSpacing property.
        ///  The spacing between each item. 
        ///  
        [
        WebCategory("Layout"), 
        DefaultValue(-1),
        WebSysDescription(SR.RadioButtonList_CellSpacing)
        ]
        public virtual int CellSpacing { 
            get {
                if (ControlStyleCreated == false) { 
                    return -1; 
                }
                return ((TableStyle)ControlStyle).CellSpacing; 
            }
            set {
                ((TableStyle)ControlStyle).CellSpacing = value;
            } 
        }
 
        private RadioButton ControlToRepeat { 
            get {
                if (_controlToRepeat != null) 
                    return _controlToRepeat;

                _controlToRepeat = new RadioButton();
                _controlToRepeat.EnableViewState = false; 
                Controls.Add(_controlToRepeat);
 
                // A note is that we don't need to set the GroupName on the radio 
                // button as the radio button would simply use its naming container
                // (which would be this control) as its name attribute for postback. 

                // Apply properties that are the same for each radio button
                _controlToRepeat.AutoPostBack = AutoPostBack;
                _controlToRepeat.CausesValidation = CausesValidation; 
                _controlToRepeat.ValidationGroup = ValidationGroup;
 
                return _controlToRepeat; 
            }
        } 


        /// 
        ///    Indicates the column count of radio buttons 
        ///    within the group.
        ///  
        [ 
        WebCategory("Layout"),
        DefaultValue(0), 
        WebSysDescription(SR.RadioButtonList_RepeatColumns)
        ]
        public virtual int RepeatColumns {
            get { 
                object o = ViewState["RepeatColumns"];
                return((o == null) ? 0 : (int)o); 
            } 
            set {
                if (value < 0) { 
                    throw new ArgumentOutOfRangeException("value");
                }
                ViewState["RepeatColumns"] = value;
            } 
        }
 
 
        /// 
        ///    Gets or sets the direction of flow of 
        ///       the radio buttons within the group.
        /// 
        [
        WebCategory("Layout"), 
        DefaultValue(RepeatDirection.Vertical),
        WebSysDescription(SR.Item_RepeatDirection) 
        ] 
        public virtual RepeatDirection RepeatDirection {
            get { 
                object o = ViewState["RepeatDirection"];
                return((o == null) ? RepeatDirection.Vertical : (RepeatDirection)o);
            }
            set { 
                if (value < RepeatDirection.Horizontal || value > RepeatDirection.Vertical) {
                    throw new ArgumentOutOfRangeException("value"); 
                } 
                ViewState["RepeatDirection"] = value;
            } 
        }


        ///  
        ///    Indicates the layout of radio buttons within the
        ///       group. 
        ///  
        [
        WebCategory("Layout"), 
        DefaultValue(RepeatLayout.Table),
        WebSysDescription(SR.WebControl_RepeatLayout)
        ]
        public virtual RepeatLayout RepeatLayout { 
            get {
                object o = ViewState["RepeatLayout"]; 
                return((o == null) ? RepeatLayout.Table : (RepeatLayout)o); 
            }
            set { 
                EnumerationRangeValidationUtil.ValidateRepeatLayout(value);
                ViewState["RepeatLayout"] = value;
            }
        } 

 
        ///  
        ///    
        ///       Indicates the label text alignment for the radio buttons within the group. 
        /// 
        [
        WebCategory("Appearance"),
        DefaultValue(TextAlign.Right), 
        WebSysDescription(SR.WebControl_TextAlign)
        ] 
        public virtual TextAlign TextAlign { 
            get {
                object align = ViewState["TextAlign"]; 
                return((align == null) ? TextAlign.Right : (TextAlign)align);
            }
            set {
                if (value < TextAlign.Left || value > TextAlign.Right) { 
                    throw new ArgumentOutOfRangeException("value");
                } 
                ViewState["TextAlign"] = value; 
            }
        } 


        /// 
        ///  
        /// 
        protected override Style CreateControlStyle() { 
            return new TableStyle(ViewState); 
        }
 

        /// 
        /// 
        /// Catches auto postback from a  in the list. 
        /// 
        protected override Control FindControl(string id, int pathOffset) { 
            return this; 
        }
 

        /// 
        /// 
        /// Loads the posted content of the list control if it is different from the last 
        /// posting.
        ///  
        bool IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) { 
            return LoadPostData(postDataKey, postCollection);
        } 


        /// 
        ///  
        /// Loads the posted content of the list control if it is different from the last
        /// posting. 
        ///  
        protected virtual bool LoadPostData(String postDataKey, NameValueCollection postCollection) {
 
            // When a RadioButtonList is disabled, then there is no postback data for it.
            // Since RadioButtonList doesn't call RegisterRequiresPostBack, this method will
            // never be called, so we don't need to worry about ignoring empty postback data.
 
            string post = postCollection[postDataKey];
            int currentSelectedIndex = SelectedIndex; 
 
            EnsureDataBound();
            int n = Items.Count; 
            for (int i=0; i < n; i++) {
                if (post == Items[i].Value && Items[i].Enabled) {
                    ValidateEvent(postDataKey, post);
 
                    if (i != currentSelectedIndex) {
                        SetPostDataSelection(i); 
                        return true; 
                    }
                    return false; 
                }
            }

            return false; 
        }
 
 
        /// 
        ///  
        /// Invokes the OnSelectedIndexChanged
        /// method whenever posted data for the 
        /// control has changed.
        ///  
        void IPostBackDataHandler.RaisePostDataChangedEvent() {
            RaisePostDataChangedEvent(); 
        } 

 
        /// 
        /// 
        /// Invokes the OnSelectedIndexChanged
        /// method whenever posted data for the  
        /// control has changed.
        ///  
        protected virtual void RaisePostDataChangedEvent() { 
            if (AutoPostBack && Page != null && !Page.IsPostBackEventControlRegistered) {
                // VSWhidbey 204824 
                Page.AutoPostBackControl = this;

                if (CausesValidation) {
                    Page.Validate(ValidationGroup); 
                }
            } 
            OnSelectedIndexChanged(EventArgs.Empty); 
        }
 
        protected internal override void Render(HtmlTextWriter writer) {
            if (Items.Count == 0 && !EnableLegacyRendering) {
                return;
            } 

            RepeatInfo repeatInfo = new RepeatInfo(); 
            Style style = (ControlStyleCreated ? ControlStyle : null); 
            short tabIndex = TabIndex;
            bool undirtyTabIndex = false; 

            // TabIndex here is special... it needs to be applied to the individual
            // radiobuttons and not the outer control itself
 
            // cache away the TabIndex property state
            ControlToRepeat.TabIndex = tabIndex; 
 
            if (tabIndex != 0) {
                if (ViewState.IsItemDirty("TabIndex") == false) { 
                    undirtyTabIndex = true;
                }
                TabIndex = 0;
            } 

            repeatInfo.RepeatColumns = RepeatColumns; 
            repeatInfo.RepeatDirection = RepeatDirection; 

            // If the device does not support tables, use the flow layout to render 
            if (!DesignMode && !Context.Request.Browser.Tables) {
                repeatInfo.RepeatLayout = RepeatLayout.Flow;
            }
            else { 
                repeatInfo.RepeatLayout = RepeatLayout;
            } 
 
            if (repeatInfo.RepeatLayout == RepeatLayout.Flow) {
                repeatInfo.EnableLegacyRendering = EnableLegacyRendering; 
            }

            repeatInfo.RenderRepeater(writer, (IRepeatInfoUser)this, style, this);
 
            if (Page != null) {
                Page.ClientScript.RegisterForEventValidation(UniqueID); 
            } 

            // restore the state of the TabIndex property 
            if (tabIndex != 0) {
                TabIndex = tabIndex;
            }
            if (undirtyTabIndex) { 
                ViewState.SetItemDirty("TabIndex", false);
            } 
        } 

 
        /// 
        /// 
        /// 
        bool IRepeatInfoUser.HasFooter { 
            get {
                return HasFooter; 
            } 
        }
 

        /// 
        /// 
        ///  
        protected virtual bool HasFooter {
            get { 
                return false; 
            }
        } 


        /// 
        ///  
        /// 
        bool IRepeatInfoUser.HasHeader { 
            get { 
                return HasHeader;
            } 
        }


        ///  
        /// 
        ///  
        protected virtual bool HasHeader { 
            get {
                return false; 
            }
        }

 
        /// 
        ///  
        ///  
        bool IRepeatInfoUser.HasSeparators {
            get { 
                return HasSeparators;
            }
        }
 

        ///  
        ///  
        /// 
        protected virtual bool HasSeparators { 
            get {
                return false;
            }
        } 

 
        ///  
        /// 
        ///  
        int IRepeatInfoUser.RepeatedItemCount {
            get {
                return RepeatedItemCount;
            } 
        }
 
 
        /// 
        ///  
        /// 
        protected virtual int RepeatedItemCount {
            get {
                return (Items != null) ? Items.Count : 0; 
            }
        } 
 

        ///  
        /// 
        /// 
        Style IRepeatInfoUser.GetItemStyle(ListItemType itemType, int repeatIndex) {
            return GetItemStyle(itemType, repeatIndex); 
        }
 
 
        /// 
        ///  
        /// 
        protected virtual Style GetItemStyle(ListItemType itemType, int repeatIndex) {
            return null;
        } 

 
        ///  
        /// 
        /// Called by the RepeatInfo helper to render each item 
        /// 
        void IRepeatInfoUser.RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer) {
            RenderItem(itemType, repeatIndex, repeatInfo, writer);
        } 

 
        ///  
        /// 
        /// Called by the RepeatInfo helper to render each item 
        /// 
        protected virtual void RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer) {
            if (repeatIndex == 0) {
                _cachedIsEnabled = IsEnabled; 
                _cachedRegisterEnabled = (Page != null) && (SaveSelectedIndicesViewState == false);
            } 
 
            RadioButton controlToRepeat = ControlToRepeat;
 
            // Apply properties of the list items
            int repeatIndexOffset = repeatIndex + _offset;

            ListItem item = Items[repeatIndexOffset]; 

            // VSWhidbey 153920 Render expando attributes. 
            controlToRepeat.Attributes.Clear(); 
            if (item.HasAttributes) {
                foreach (string key in item.Attributes.Keys) { 
                    controlToRepeat.Attributes[key] = item.Attributes[key];
                }
            }
 
            // Dev10 684108: reset the CssClass for each item.
            if (!string.IsNullOrEmpty(controlToRepeat.CssClass)) { 
                controlToRepeat.CssClass = ""; 
            }
 
            SetControlToRepeatID(this, controlToRepeat, repeatIndexOffset);
            controlToRepeat.Text = item.Text;

            controlToRepeat.Attributes["value"] = item.Value; 
            controlToRepeat.Checked = item.Selected;
            controlToRepeat.Enabled = _cachedIsEnabled && item.Enabled; 
            controlToRepeat.TextAlign = TextAlign; 
            controlToRepeat.RenderControl(writer);
 
            if (controlToRepeat.Enabled && _cachedRegisterEnabled && Page != null) {
                // Store a client-side array of enabled control, so we can re-enable them on
                // postback (in case they are disabled client-side)
                // Postback is needed when SelectedIndices is not saved in view state 
                Page.RegisterEnabledControl(controlToRepeat);
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK