RelatedPropertyManager.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / WinForms / Managed / System / WinForms / RelatedPropertyManager.cs / 1 / RelatedPropertyManager.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms { 
 
    using System;
    using Microsoft.Win32; 
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
    using System.ComponentModel;
    using System.Collections; 

    internal class RelatedPropertyManager : PropertyManager { 
 
        BindingManagerBase parentManager;
        string dataField; 
        PropertyDescriptor fieldInfo;

        [
            SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")  // If the constructor does not set the dataSource 
                                                                                                    // it would be a breaking change.
        ] 
        internal RelatedPropertyManager(BindingManagerBase parentManager, string dataField) : base(GetCurrentOrNull(parentManager), dataField) { 
            Bind(parentManager, dataField);
        } 

        private void Bind(BindingManagerBase parentManager, string dataField) {
            Debug.Assert(parentManager != null, "How could this be a null parentManager.");
            this.parentManager = parentManager; 
            this.dataField = dataField;
            this.fieldInfo = parentManager.GetItemProperties().Find(dataField, true); 
            if (fieldInfo == null) 
                throw new ArgumentException(SR.GetString(SR.RelatedListManagerChild, dataField));
            // this.finalType = fieldInfo.PropertyType; 
            parentManager.CurrentItemChanged += new EventHandler(ParentManager_CurrentItemChanged);
            Refresh();
        }
 
        internal override string GetListName() {
            string name = GetListName(new ArrayList()); 
            if (name.Length > 0) { 
                return name;
            } 
            return base.GetListName();
        }

        protected internal override string GetListName(ArrayList listAccessors) { 
            listAccessors.Insert(0, fieldInfo);
            return parentManager.GetListName(listAccessors); 
        } 

        internal override PropertyDescriptorCollection GetItemProperties(PropertyDescriptor[] listAccessors) { 
            PropertyDescriptor[] accessors;

            if (listAccessors != null && listAccessors.Length > 0) {
                accessors = new PropertyDescriptor[listAccessors.Length + 1]; 
                listAccessors.CopyTo(accessors, 1);
            } 
            else { 
                accessors = new PropertyDescriptor[1];
            } 

            // Set this accessor (add to the beginning)
            accessors[0] = this.fieldInfo;
 
            // Get props
            return parentManager.GetItemProperties(accessors); 
        } 

        private void ParentManager_CurrentItemChanged(object sender, EventArgs e) { 
            Refresh();
        }

        private void Refresh() { 
            EndCurrentEdit();
            SetDataSource(GetCurrentOrNull(parentManager)); 
            OnCurrentChanged(EventArgs.Empty); 
        }
 

        internal override Type BindType {
            get {
                return fieldInfo.PropertyType; 
            }
        } 
 
        public override object Current {
            get { 
                return (this.DataSource != null) ? fieldInfo.GetValue(this.DataSource) : null;
            }
        }
 
        static private object GetCurrentOrNull(BindingManagerBase parentManager) {
            bool anyCurrent = (parentManager.Position >= 0 && parentManager.Position < parentManager.Count); 
            return anyCurrent ? parentManager.Current : null; 
        }
 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms { 
 
    using System;
    using Microsoft.Win32; 
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
    using System.ComponentModel;
    using System.Collections; 

    internal class RelatedPropertyManager : PropertyManager { 
 
        BindingManagerBase parentManager;
        string dataField; 
        PropertyDescriptor fieldInfo;

        [
            SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")  // If the constructor does not set the dataSource 
                                                                                                    // it would be a breaking change.
        ] 
        internal RelatedPropertyManager(BindingManagerBase parentManager, string dataField) : base(GetCurrentOrNull(parentManager), dataField) { 
            Bind(parentManager, dataField);
        } 

        private void Bind(BindingManagerBase parentManager, string dataField) {
            Debug.Assert(parentManager != null, "How could this be a null parentManager.");
            this.parentManager = parentManager; 
            this.dataField = dataField;
            this.fieldInfo = parentManager.GetItemProperties().Find(dataField, true); 
            if (fieldInfo == null) 
                throw new ArgumentException(SR.GetString(SR.RelatedListManagerChild, dataField));
            // this.finalType = fieldInfo.PropertyType; 
            parentManager.CurrentItemChanged += new EventHandler(ParentManager_CurrentItemChanged);
            Refresh();
        }
 
        internal override string GetListName() {
            string name = GetListName(new ArrayList()); 
            if (name.Length > 0) { 
                return name;
            } 
            return base.GetListName();
        }

        protected internal override string GetListName(ArrayList listAccessors) { 
            listAccessors.Insert(0, fieldInfo);
            return parentManager.GetListName(listAccessors); 
        } 

        internal override PropertyDescriptorCollection GetItemProperties(PropertyDescriptor[] listAccessors) { 
            PropertyDescriptor[] accessors;

            if (listAccessors != null && listAccessors.Length > 0) {
                accessors = new PropertyDescriptor[listAccessors.Length + 1]; 
                listAccessors.CopyTo(accessors, 1);
            } 
            else { 
                accessors = new PropertyDescriptor[1];
            } 

            // Set this accessor (add to the beginning)
            accessors[0] = this.fieldInfo;
 
            // Get props
            return parentManager.GetItemProperties(accessors); 
        } 

        private void ParentManager_CurrentItemChanged(object sender, EventArgs e) { 
            Refresh();
        }

        private void Refresh() { 
            EndCurrentEdit();
            SetDataSource(GetCurrentOrNull(parentManager)); 
            OnCurrentChanged(EventArgs.Empty); 
        }
 

        internal override Type BindType {
            get {
                return fieldInfo.PropertyType; 
            }
        } 
 
        public override object Current {
            get { 
                return (this.DataSource != null) ? fieldInfo.GetValue(this.DataSource) : null;
            }
        }
 
        static private object GetCurrentOrNull(BindingManagerBase parentManager) {
            bool anyCurrent = (parentManager.Position >= 0 && parentManager.Position < parentManager.Count); 
            return anyCurrent ? parentManager.Current : null; 
        }
 
    }
}

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

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