DataSourceExpression.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / UI / WebControls / Expressions / DataSourceExpression.cs / 1305376 / DataSourceExpression.cs
                        
                        
                            #if ORYX_VNEXT 
namespace Microsoft.Web.Data.UI.WebControls.Expressions {
#else
namespace System.Web.UI.WebControls.Expressions {
#endif 
    using System;
    using System.ComponentModel; 
    using System.Linq; 
    using System.Linq.Expressions;
    using System.Web; 
    using System.Web.UI;
    using System.Web.UI.WebControls;

 
    public abstract class DataSourceExpression : IStateManager {
        private bool _tracking; 
        private StateBag _viewState; 

        protected HttpContext Context { 
            get;
            private set;
        }
 
        protected Control Owner {
            get; 
            private set; 
        }
 
        public IQueryableDataSource DataSource {
            get;
            // Internal set for unit testing
            internal set; 
        }
 
 
        protected bool IsTrackingViewState {
            get { 
                return _tracking;
            }
        }
 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        ]
        protected StateBag ViewState { 
            get {
                if (_viewState == null) {
                    _viewState = new StateBag();
                    if (_tracking) 
                        ((IStateManager)_viewState).TrackViewState();
                } 
                return _viewState; 
            }
        } 

        protected DataSourceExpression() {
        }
 
        // internal for unit testing
        internal DataSourceExpression(Control owner) { 
            Owner = owner; 
        }
 
        public void SetDirty() {
            ViewState.SetDirty(true);
        }
 
        protected virtual void LoadViewState(object savedState) {
            if (savedState != null) { 
                ((IStateManager)ViewState).LoadViewState(savedState); 
            }
        } 

        protected virtual object SaveViewState() {
            return (_viewState != null) ? ((IStateManager)_viewState).SaveViewState() : null;
        } 

        protected virtual void TrackViewState() { 
            _tracking = true; 

            if (_viewState != null) { 
                ((IStateManager)_viewState).TrackViewState();
            }
        }
 
        public abstract IQueryable GetQueryable(IQueryable source);
 
        public virtual void SetContext(Control owner, HttpContext context, IQueryableDataSource dataSource) { 
            if (owner == null) {
                throw new ArgumentNullException("owner"); 
            }

            if (context == null) {
                throw new ArgumentNullException("context"); 
            }
 
            if (dataSource == null) { 
                throw new ArgumentNullException("dataSource");
            } 

            Owner = owner;
            Context = context;
            DataSource = dataSource; 
        }
 
        #region IStateManager Members 

        bool IStateManager.IsTrackingViewState { 
            get {
                return IsTrackingViewState;
            }
        } 

        void IStateManager.LoadViewState(object state) { 
            LoadViewState(state); 
        }
 
        object IStateManager.SaveViewState() {
            return SaveViewState();
        }
 
        void IStateManager.TrackViewState() {
            TrackViewState(); 
        } 

        #endregion 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
#if ORYX_VNEXT 
namespace Microsoft.Web.Data.UI.WebControls.Expressions {
#else
namespace System.Web.UI.WebControls.Expressions {
#endif 
    using System;
    using System.ComponentModel; 
    using System.Linq; 
    using System.Linq.Expressions;
    using System.Web; 
    using System.Web.UI;
    using System.Web.UI.WebControls;

 
    public abstract class DataSourceExpression : IStateManager {
        private bool _tracking; 
        private StateBag _viewState; 

        protected HttpContext Context { 
            get;
            private set;
        }
 
        protected Control Owner {
            get; 
            private set; 
        }
 
        public IQueryableDataSource DataSource {
            get;
            // Internal set for unit testing
            internal set; 
        }
 
 
        protected bool IsTrackingViewState {
            get { 
                return _tracking;
            }
        }
 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        ]
        protected StateBag ViewState { 
            get {
                if (_viewState == null) {
                    _viewState = new StateBag();
                    if (_tracking) 
                        ((IStateManager)_viewState).TrackViewState();
                } 
                return _viewState; 
            }
        } 

        protected DataSourceExpression() {
        }
 
        // internal for unit testing
        internal DataSourceExpression(Control owner) { 
            Owner = owner; 
        }
 
        public void SetDirty() {
            ViewState.SetDirty(true);
        }
 
        protected virtual void LoadViewState(object savedState) {
            if (savedState != null) { 
                ((IStateManager)ViewState).LoadViewState(savedState); 
            }
        } 

        protected virtual object SaveViewState() {
            return (_viewState != null) ? ((IStateManager)_viewState).SaveViewState() : null;
        } 

        protected virtual void TrackViewState() { 
            _tracking = true; 

            if (_viewState != null) { 
                ((IStateManager)_viewState).TrackViewState();
            }
        }
 
        public abstract IQueryable GetQueryable(IQueryable source);
 
        public virtual void SetContext(Control owner, HttpContext context, IQueryableDataSource dataSource) { 
            if (owner == null) {
                throw new ArgumentNullException("owner"); 
            }

            if (context == null) {
                throw new ArgumentNullException("context"); 
            }
 
            if (dataSource == null) { 
                throw new ArgumentNullException("dataSource");
            } 

            Owner = owner;
            Context = context;
            DataSource = dataSource; 
        }
 
        #region IStateManager Members 

        bool IStateManager.IsTrackingViewState { 
            get {
                return IsTrackingViewState;
            }
        } 

        void IStateManager.LoadViewState(object state) { 
            LoadViewState(state); 
        }
 
        object IStateManager.SaveViewState() {
            return SaveViewState();
        }
 
        void IStateManager.TrackViewState() {
            TrackViewState(); 
        } 

        #endregion 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DataSourceExpression.cs source code in C# .NET

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