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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / DefaultValueTypeConverter.cs / 1305376 / DefaultValueTypeConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- /* */ namespace System.Data { using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Globalization; ////// internal sealed class DefaultValueTypeConverter : StringConverter { private static string nullString = "Provides a type /// converter that can be used to populate a list box with available types. ///"; private static string dbNullString = " "; // converter classes should have public ctor public DefaultValueTypeConverter() { } public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if (destinationType == typeof(string)) { if (value == null) { return nullString; } else if (value == DBNull.Value) { return dbNullString; } } return base.ConvertTo(context, culture, value, destinationType); } public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value != null && value.GetType() == typeof(string)) { string strValue = (string)value; if (string.Compare(strValue, nullString, StringComparison.OrdinalIgnoreCase) == 0) return null; else if (string.Compare(strValue, dbNullString, StringComparison.OrdinalIgnoreCase) == 0) return DBNull.Value; } return base.ConvertFrom(context, culture, value); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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