EntityDataSourceWrapperPropertyDescriptor.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 / DataWebControls / System / Data / WebControls / EntityDataSourceWrapperPropertyDescriptor.cs / 1305376 / EntityDataSourceWrapperPropertyDescriptor.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 
using System;
using System.Data; 
using System.Configuration;
using System.ComponentModel;
using System.Data.Common;
using System.Data.Metadata.Edm; 
using System.Reflection;
using System.Data.Objects; 
using System.Data.Objects.DataClasses; 
using System.Collections.Generic;
using System.Diagnostics; 
using System.Linq;
using System.Collections.ObjectModel;
using System.Text;
 
namespace System.Web.UI.WebControls
{ 
    ///  
    /// Wrapper property descriptor that handles access of nested members and
    /// entity reference keys. 
    /// 
    /// 
    /// This class essentially glues together a wrapper collection (roughly speaking
    /// the 'data' exposed by the control) and the column (which defines the metadata 
    /// and behaviors for the current property).
    ///  
    internal sealed class EntityDataSourceWrapperPropertyDescriptor : PropertyDescriptor 
    {
        private readonly EntityDataSourceWrapperCollection _collection; 
        private readonly EntityDataSourceColumn _column;

        internal EntityDataSourceWrapperPropertyDescriptor(EntityDataSourceWrapperCollection collection, EntityDataSourceColumn column)
            : base(EntityDataSourceUtil.CheckArgumentNull(column, "column").DisplayName, new Attribute[] { }) 
        {
            EntityDataSourceUtil.CheckArgumentNull(collection, "collection"); 
 
            _collection = collection;
            _column = column; 
        }

        internal EntityDataSourceColumn Column
        { 
            get { return _column; }
        } 
 
        public override Type ComponentType
        { 
            get { return _collection.ClrEntityType; }
        }

        public override bool IsReadOnly 
        {
            get { return _collection.IsReadOnly || !_column.CanWrite; } 
        } 

        public override Type PropertyType 
        {
            get { return _column.ClrType; }
        }
 
        public override bool CanResetValue(object component)
        { 
            return false; 
        }
 
        public override void ResetValue(object component)
        {
            throw new InvalidOperationException(Strings.ValueNotResettable(this.ComponentType.Name));
        } 

        public override object GetValue(object component) 
        { 
            return _column.GetValue(GetWrapper(component));
        } 

        public override void SetValue(object component, object value)
        {
            if (IsReadOnly) 
            {
                throw new InvalidOperationException(Strings.SetValueNotSupported); 
            } 
            _column.SetValue(GetWrapper(component), value);
        } 

        public override bool ShouldSerializeValue(object component)
        {
            return false; 
        }
 
        private EntityDataSourceWrapper GetWrapper(object component) 
        {
            // Validate that the component comes from the collection to which 
            // this descriptor is bound. Elements of the collection are
            // non-null wrappers instances.
            EntityDataSourceUtil.CheckArgumentNull(component, "component");
 
            EntityDataSourceWrapper wrapper = component as EntityDataSourceWrapper;
            if (null == wrapper || this._collection != wrapper.Collection) 
            { 
                throw new ArgumentException(Strings.ComponentNotFromProperCollection, "component");
            } 

            return wrapper;
        }
    } 
}

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

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