Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / DataSourceViewSchemaConverter.cs / 1 / DataSourceViewSchemaConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.Design { using System; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.Globalization; using System.Runtime.InteropServices; using System.Web.UI; ////// /// [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] public class DataSourceViewSchemaConverter : TypeConverter { ////// Provides design-time support for getting schema from an object /// ////// /// public DataSourceViewSchemaConverter() { } ////// /// 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) { return GetStandardValues(context, null); } public virtual StandardValuesCollection GetStandardValues(ITypeDescriptorContext context, Type typeFilter) { string[] names = null; if (context != null) { IDataSourceViewSchemaAccessor schemaAccessor = context.Instance as IDataSourceViewSchemaAccessor; if (schemaAccessor != null) { IDataSourceViewSchema schema = schemaAccessor.DataSourceViewSchema as IDataSourceViewSchema; if (schema != null) { IDataSourceFieldSchema[] fields = schema.GetFields(); string[] tempNames = new string[fields.Length]; int fieldCount = 0; for (int i = 0; i < fields.Length; i++) { if ((typeFilter != null && fields[i].DataType == typeFilter) || typeFilter == null) { tempNames[fieldCount] = fields[i].Name; fieldCount++; } } names = new string[fieldCount]; Array.Copy(tempNames, names, fieldCount); } } if (names == null) { names = new string[0]; } Array.Sort(names, Comparer.Default); } return new StandardValuesCollection(names); } ////// Gets the fields present within the selected object's schema /// ////// /// 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) { if ((context != null) && (context.Instance is IDataSourceViewSchemaAccessor)) { return true; } return false; } } } // 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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