Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / DataSourceConverter.cs / 1 / DataSourceConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.Design { using System; using System.CodeDom; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.Data; using System.Diagnostics; using System.Runtime.InteropServices; using System.Globalization; ////// /// [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] public class DataSourceConverter : TypeConverter { ////// Provides design-time support for a component's data source property. /// ////// /// public DataSourceConverter() { } ////// Initializes a new instance of ///. /// /// /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string)) { return true; } return false; } ////// Gets a value indicating whether this converter can /// convert an object in the given source type to the native type of the converter /// using the context. /// ////// /// public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value == null) { return String.Empty; } else if (value.GetType() == typeof(string)) { return (string)value; } throw GetConvertFromException(value); } ////// Converts the given object to the converter's native type. /// ////// /// public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { object[] names = null; if (context != null) { ArrayList list = new ArrayList(); IContainer cont = context.Container; if (cont != null) { ComponentCollection objs = cont.Components; foreach (IComponent comp in (IEnumerable)objs) { if (IsValidDataSource(comp) && !Marshal.IsComObject(comp)) { PropertyDescriptor modifierProp = TypeDescriptor.GetProperties(comp)["Modifiers"]; if (modifierProp != null) { MemberAttributes modifiers = (MemberAttributes)modifierProp.GetValue(comp); if ((modifiers & MemberAttributes.AccessMask) == MemberAttributes.Private) { // must be declared as public or protected continue; } } ISite site = comp.Site; if (site != null) { string name = site.Name; if (name != null) { list.Add(name); } } } } } names = list.ToArray(); Array.Sort(names, Comparer.Default); } return new StandardValuesCollection(names); } ////// Gets the standard data sources accessible to the control. /// ////// /// public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { return false; } ////// Gets a value indicating whether the collection of standard values returned from /// ///is an exclusive /// list of possible values, using the specified context. /// /// /// public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } protected virtual bool IsValidDataSource(IComponent component) { return (component is IEnumerable) || (component is IListSource); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved./// Gets a value indicating whether this object supports a standard set of values /// that can be picked from a list. /// ///
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