PropertyManager.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / PropertyManager.cs / 1 / PropertyManager.cs
                        
                        
                            namespace System.Windows.Forms { 

    using System;
    using System.Windows.Forms;
    using System.Diagnostics.CodeAnalysis; 
    using System.ComponentModel;
    using System.Collections; 
 
    /// 
    ///  
    ///    [To be supplied.]
    /// 
    public class PropertyManager : BindingManagerBase {
 
        // PropertyManager class
        // 
 
        private object dataSource;
        private string propName; 
        private PropertyDescriptor propInfo;
        private bool bound;

 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public override Object Current { 
            get {
                return this.dataSource;
            }
        } 

        private void PropertyChanged(object sender, EventArgs ea) { 
            EndCurrentEdit(); 
            OnCurrentChanged(EventArgs.Empty);
        } 

        internal override void SetDataSource(Object dataSource) {
            if (this.dataSource != null && !String.IsNullOrEmpty(this.propName)) {
                propInfo.RemoveValueChanged(this.dataSource, new EventHandler(PropertyChanged)); 
                propInfo = null;
            } 
 
            this.dataSource = dataSource;
 
            if (this.dataSource != null && !String.IsNullOrEmpty(this.propName)) {
                propInfo = TypeDescriptor.GetProperties(dataSource).Find(propName, true);
                if (propInfo == null)
                    throw new ArgumentException(SR.GetString(SR.PropertyManagerPropDoesNotExist, propName, dataSource.ToString())); 
                propInfo.AddValueChanged(dataSource, new EventHandler(PropertyChanged));
            } 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public PropertyManager() {} 

        [ 
            SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")  // If the constructor does not set the dataSource 
                                                                                                    // it would be a breaking change.
        ] 
        internal PropertyManager(Object dataSource) : base(dataSource){}

        [
            SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")  // If the constructor does not set the dataSource 
                                                                                                    // it would be a breaking change.
        ] 
        internal PropertyManager(Object dataSource, string propName) : base() { 
            this.propName = propName;
            this.SetDataSource(dataSource); 
        }

        internal override PropertyDescriptorCollection GetItemProperties(PropertyDescriptor[] listAccessors) {
            return ListBindingHelper.GetListItemProperties(dataSource, listAccessors); 
        }
 
        internal override Type BindType { 
            get {
                return dataSource.GetType(); 
            }
        }

        internal override String GetListName() { 
            return TypeDescriptor.GetClassName(dataSource) + "." + propName;
        } 
 
        /// 
        public override void SuspendBinding() { 
            EndCurrentEdit();
            if (bound) {
                try {
                    bound = false; 
                    UpdateIsBinding();
                } catch { 
                    bound = true; 
                    UpdateIsBinding();
                    throw; 
                }
            }
        }
 
        /// 
        public override void ResumeBinding() { 
            OnCurrentChanged(new EventArgs()); 
            if (!bound) {
                try { 
                    bound = true;
                    UpdateIsBinding();
                } catch {
                    bound = false; 
                    UpdateIsBinding();
                    throw; 
                } 
            }
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        protected internal override String GetListName(ArrayList listAccessors) { 
            return ""; 
        }
 
        /// 
        /// 
        ///    [To be supplied.]
        ///  
        public override void CancelCurrentEdit() {
            IEditableObject obj = this.Current as IEditableObject; 
            if (obj != null) 
                obj.CancelEdit();
            PushData(); 
        }

        /// 
        ///  
        ///    [To be supplied.]
        ///  
        public override void EndCurrentEdit() { 
            bool success;
            PullData(out success); 

            if (success) {
                IEditableObject obj = this.Current as IEditableObject;
                if (obj != null) 
                    obj.EndEdit();
            } 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        protected override void UpdateIsBinding() { 
            for (int i = 0; i < this.Bindings.Count; i++)
                this.Bindings[i].UpdateIsBinding(); 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        internal protected override void OnCurrentChanged(EventArgs ea) { 
            PushData();
 
            if (this.onCurrentChangedHandler != null) 
                this.onCurrentChangedHandler(this, ea);
 
            if (this.onCurrentItemChangedHandler != null)
                this.onCurrentItemChangedHandler(this, ea);
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        internal protected override void OnCurrentItemChanged(EventArgs ea) { 
            PushData();

            if (this.onCurrentItemChangedHandler != null)
                this.onCurrentItemChangedHandler(this, ea); 
        }
 
        internal override object DataSource { 
            get {
                return this.dataSource; 
            }
        }

        internal override bool IsBinding { 
            get {
                return (dataSource != null); 
            } 
        }
 
        // no op on the propertyManager
        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        public override int Position { 
            get { 
                return 0;
            } 
            set {
            }
        }
 
        /// 
        public override int Count { 
            get { 
                return 1;
            } 
        }

        // no-op on the propertyManager
        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public override void AddNew() {
            throw new NotSupportedException(SR.GetString(SR.DataBindingAddNewNotSupportedOnPropertyManager)); 
        }

        // no-op on the propertyManager
        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public override void RemoveAt(int index) {
            throw new NotSupportedException(SR.GetString(SR.DataBindingRemoveAtNotSupportedOnPropertyManager)); 
        }
    }
}

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

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