ReadOnlyDataSource.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / ReadOnlyDataSource.cs / 1 / ReadOnlyDataSource.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Web;
    using System.Web.UI;
    using System.Web.Util; 

 
    ///  
    /// Helper class for data bound controls to wrap an generic data source
    /// with a strongly typed IDataSource. This class automatically handles 
    /// other IDataSources, IEnumerable, and IListSource objects.
    /// This class uses ReadOnlyDataSourceView to represent individual views.
    /// 
    internal sealed class ReadOnlyDataSource : IDataSource { 

        private static string[] ViewNames = new string[0]; 
 
        private string _dataMember;
        private object _dataSource; 

        public ReadOnlyDataSource(object dataSource, string dataMember) {
            Debug.Assert(dataSource == null || (dataSource is IEnumerable || dataSource is IDataSource || dataSource is IListSource), "Expected dataSource to be either null, an IEnumerable, an IDataSource, or an IListSource.");
            _dataSource = dataSource; 
            _dataMember = dataMember;
        } 
 
        #region Implementation of IDataSource
        event EventHandler IDataSource.DataSourceChanged { 
            add {
            }
            remove {
            } 
        }
 
        ///  
        /// Check for IDataSource, IListSource, and IEnumerable, and return an
        /// approprite DataSourceView. 
        /// 
        DataSourceView IDataSource.GetView(string viewName) {
            // Check first for IDataSource
            IDataSource ds = _dataSource as IDataSource; 
            if (ds != null) {
                return ds.GetView(viewName); 
            } 

            IEnumerable enumerable = DataSourceHelper.GetResolvedDataSource(_dataSource, _dataMember); 
            return new ReadOnlyDataSourceView(this, _dataMember, enumerable);
        }

        ICollection IDataSource.GetViewNames() { 
            return ViewNames;
        } 
        #endregion 
    }
}

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