DataPagerField.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / UI / WebControls / DataPagerField.cs / 1305376 / DataPagerField.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System; 
using System.ComponentModel; 
using System.Diagnostics.CodeAnalysis;
using System.Web; 
using System.Web.UI;

namespace System.Web.UI.WebControls {
    public abstract class DataPagerField : IStateManager { 
        private StateBag _stateBag;
        private bool _trackViewState; 
        private DataPager _dataPager; 

        internal event EventHandler FieldChanged; 

        protected DataPagerField() {
            _stateBag = new StateBag();
        } 

        protected StateBag ViewState { 
            get { 
                return _stateBag;
            } 
        }

        protected bool IsTrackingViewState {
            get { 
                return _trackViewState;
            } 
        } 

        protected DataPager DataPager { 
            get {
                return _dataPager;
            }
        } 

        protected bool QueryStringHandled { 
            get { 
                return DataPager.QueryStringHandled;
            } 
            set {
                DataPager.QueryStringHandled = value;
            }
        } 

        protected string QueryStringValue { 
            get { 
                return DataPager.QueryStringValue;
            } 
        }

        [
        Category("Behavior"), 
        DefaultValue(true),
        ResourceDescription("DataPagerField_Visible") 
        ] 
        public bool Visible {
            get { 
                object o = ViewState["Visible"];
                if (o != null) {
                    return (bool)o;
                } 
                return true;
            } 
            set { 
                if (value != Visible) {
                    ViewState["Visible"] = value; 
                    OnFieldChanged();
                }
            }
        } 

        protected internal DataPagerField CloneField() { 
            DataPagerField newField = CreateField(); 
            CopyProperties(newField);
            return newField; 
        }

        protected virtual void CopyProperties(DataPagerField newField) {
            newField.Visible = Visible; 
        }
 
        public abstract void CreateDataPagers(DataPagerFieldItem container, int startRowIndex, int maximumRows, int totalRowCount, int fieldIndex); 

        protected abstract DataPagerField CreateField(); 

        [SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings",
            Justification="Return value matches HyperLink.NavigateUrl property type.")]
        protected string GetQueryStringNavigateUrl(int pageNumber) { 
            return DataPager.GetQueryStringNavigateUrl(pageNumber);
        } 
 
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", MessageId = "0#")]
        public abstract void HandleEvent(CommandEventArgs e); 

        protected virtual void LoadViewState(object savedState) {
            if (savedState != null) {
                object[] myState = (object[])savedState; 

                if (myState[0] != null) 
                    ((IStateManager)ViewState).LoadViewState(myState[0]); 
            }
        } 

        protected virtual void OnFieldChanged() {
            if (FieldChanged != null) {
                FieldChanged(this, EventArgs.Empty); 
            }
        } 
 

        protected virtual object SaveViewState() { 
            object state = ((IStateManager)ViewState).SaveViewState();

            if ((state != null)) {
                return new object[1] { 
                    state
                }; 
            } 

            return null; 
        }

        internal void SetDirty() {
            _stateBag.SetDirty(true); 
        }
 
        internal void SetDataPager(DataPager dataPager) { 
            _dataPager = dataPager;
        } 

        protected virtual void TrackViewState() {
            _trackViewState = true;
            ((IStateManager)ViewState).TrackViewState(); 
        }
 
        #region IStateManager 
        /// 
        ///  
        /// Return true if tracking state changes.
        /// 
        bool IStateManager.IsTrackingViewState {
            get { 
                return IsTrackingViewState;
            } 
        } 

        ///  
        /// 
        /// Load previously saved state.
        /// 
        void IStateManager.LoadViewState(object state) { 
            LoadViewState(state);
        } 
 
        /// 
        ///  
        /// Start tracking state changes.
        /// 
        void IStateManager.TrackViewState() {
            TrackViewState(); 
        }
 
        ///  
        /// 
        /// Return object containing state changes. 
        /// 
        object IStateManager.SaveViewState() {
            return SaveViewState();
        } 
        #endregion IStateManager
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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DataPagerField.cs source code in C# .NET

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