ListSourceHelper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / ListSourceHelper.cs / 1 / ListSourceHelper.cs
                        

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

namespace System.Web.UI { 
 
    using System.Collections;
    using System.ComponentModel; 
    using System.Security.Permissions;


    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public static class ListSourceHelper {
 
        public static bool ContainsListCollection(IDataSource dataSource) { 
            ICollection viewNames = dataSource.GetViewNames();
            if (viewNames != null && viewNames.Count > 0) { 
                return true;
            }
            return false;
        } 

 
        public static IList GetList(IDataSource dataSource) { 
            ICollection viewNames = dataSource.GetViewNames();
 
            if (viewNames != null && viewNames.Count > 0) {
                return new ListSourceList(dataSource);
            }
            return null; 
        }
 
        internal sealed class ListSourceList : CollectionBase, ITypedList { 
            IDataSource _dataSource;
 
            public ListSourceList(IDataSource dataSource) {
                _dataSource = dataSource;
                ((IList)this).Add(new ListSourceRow(_dataSource));
            } 

            #region ITypedList implementation 
            string ITypedList.GetListName(PropertyDescriptor[] listAccessors) { 
                return String.Empty;
            } 

            PropertyDescriptorCollection ITypedList.GetItemProperties(PropertyDescriptor[] listAccessors) {
                if (_dataSource != null) {
                    ICollection viewNames = _dataSource.GetViewNames(); 
                    if (viewNames != null && viewNames.Count > 0) {
                        string[] viewNamesArray = new string[viewNames.Count]; 
                        viewNames.CopyTo(viewNamesArray, 0); 
                        PropertyDescriptor[] props = new PropertyDescriptor[viewNames.Count];
                        for (int i = 0; i < viewNamesArray.Length; i++) { 
                            props[i] = new ListSourcePropertyDescriptor(viewNamesArray[i]);
                        }
                        return new PropertyDescriptorCollection(props);
                    } 
                }
                return new PropertyDescriptorCollection(null); 
            } 
            #endregion ITypedList implementations
        } 

        internal class ListSourceRow {
            IDataSource _dataSource;
 
            public ListSourceRow(IDataSource dataSource) {
                _dataSource = dataSource; 
            } 

            public IDataSource DataSource { 
                get {
                    return _dataSource;
                }
            } 
        }
 
        internal class ListSourcePropertyDescriptor : PropertyDescriptor { 
            string _name;
 
            public ListSourcePropertyDescriptor(string name) : base(name, null) {
                _name = name;
            }
 
            public override Type ComponentType {
                get { 
                    return typeof(ListSourceRow); 
                }
            } 

            public override bool IsReadOnly {
                get {
                    return true; 
                }
            } 
 
            public override Type PropertyType {
                get { 
                    return typeof(IEnumerable);
                }
            }
 
            public override bool CanResetValue(object value) {
                return false; 
            } 

            public override object GetValue(object source) { 
                if (source is ListSourceRow) {
                    ListSourceRow row = (ListSourceRow)source;
                    IDataSource dataSource = row.DataSource;
                    return dataSource.GetView(_name).ExecuteSelect(DataSourceSelectArguments.Empty); 
                }
                return null; 
            } 

            public override void ResetValue(object component) { 
                throw new NotSupportedException();
            }

            public override void SetValue(object component, object value) { 
                throw new NotSupportedException();
            } 
 
            public override bool ShouldSerializeValue(object component) {
                return false; 
            }
        }
    }
}

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