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//------------------------------------------------------------------------------
// <copyright file="DataMemberConverter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.Design.MobileControls.Converters
{
using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Data;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.InteropServices;
using System.Web.UI.Design;
using System.Security.Permissions;
/// <include file='doc\DataMemberConverter.uex' path='docs/doc[@for="DataMemberConverter"]/*' />
/// <devdoc>
/// <para>
/// Provides design-time support for a component's DataMember properties.
/// </para>
/// </devdoc>
[
System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand,
Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)
]
[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
[Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
public class DataMemberConverter : TypeConverter
{
/// <include file='doc\DataMemberConverter.uex' path='docs/doc[@for="DataMemberConverter.DataMemberConverter"]/*' />
/// <devdoc>
/// <para>
/// Initializes a new instance of <see cref='System.Web.UI.Design.DataFieldConverter'/>.
/// </para>
/// </devdoc>
public DataMemberConverter()
{
}
/// <include file='doc\DataMemberConverter.uex' path='docs/doc[@for="DataMemberConverter.CanConvertFrom"]/*' />
/// <devdoc>
/// <para>
/// 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.
/// </para>
/// </devdoc>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return false;
}
/// <include file='doc\DataMemberConverter.uex' path='docs/doc[@for="DataMemberConverter.ConvertFrom"]/*' />
/// <devdoc>
/// <para>
/// Converts the given object to the converter's native type.
/// </para>
/// </devdoc>
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);
}
/// <include file='doc\DataMemberConverter.uex' path='docs/doc[@for="DataMemberConverter.GetStandardValues"]/*' />
/// <devdoc>
/// <para>
/// Gets the fields present within the selected data source if information about them is available.
/// </para>
/// </devdoc>
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
string[] names = null;
if (context != null)
{
IComponent component = context.Instance as IComponent;
if (component is IDeviceSpecificChoiceDesigner)
{
component = ((IDeviceSpecificChoiceDesigner)component).UnderlyingControl;
}
if (component != null)
{
ISite componentSite = component.Site;
if (componentSite != null)
{
IDesignerHost designerHost = (IDesignerHost)componentSite.GetService(typeof(IDesignerHost));
if (designerHost != null)
{
IDesigner designer = designerHost.GetDesigner(component);
if (designer is IDataSourceProvider)
{
object dataSource = ((IDataSourceProvider)designer).GetSelectedDataSource();
if (dataSource != null)
{
names = DesignTimeData.GetDataMembers(dataSource);
}
}
}
}
}
if (names == null)
{
names = new string[0];
}
Array.Sort(names);
}
return new StandardValuesCollection(names);
}
/// <include file='doc\DataMemberConverter.uex' path='docs/doc[@for="DataMemberConverter.GetStandardValuesExclusive"]/*' />
/// <devdoc>
/// <para>
/// Gets a value indicating whether the collection of standard values returned from
/// <see cref='System.ComponentModel.TypeConverter.GetStandardValues'/> is an exclusive
/// list of possible values, using the specified context.
/// </para>
/// </devdoc>
public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
{
return false;
}
/// <include file='doc\DataMemberConverter.uex' path='docs/doc[@for="DataMemberConverter.GetStandardValuesSupported"]/*' />
/// <devdoc>
/// <para>
/// Gets a value indicating whether this object supports a standard set of values
/// that can be picked from a list.
/// </para>
/// </devdoc>
public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
{
if (context.Instance is IComponent)
{
// We only support the dropdown in single-select mode.
return true;
}
return false;
}
}
}
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