Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Sys / System / Configuration / SettingsPropertyValue.cs / 1 / SettingsPropertyValue.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Configuration { using System.Collections; using System.Collections.Specialized; using System.Runtime.Serialization; using System.Configuration.Provider; using System.Globalization; using System.IO; using System.Runtime.Serialization.Formatters.Binary; using System.Xml.Serialization; using System.ComponentModel; using System.Security.Permissions; using System.Reflection; ////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////// public class SettingsPropertyValue { public string Name { get { return _Property.Name; } } public bool IsDirty { get { return _IsDirty; } set { _IsDirty = value; }} public SettingsProperty Property { get { return _Property; } } public bool UsingDefaultValue { get { return _UsingDefaultValue; } } public SettingsPropertyValue(SettingsProperty property) { _Property = property; } public object PropertyValue { get { if (!_Deserialized) { _Value = Deserialize(); _Deserialized = true; } if (_Value != null && !Property.PropertyType.IsPrimitive && !(_Value is string) && !(_Value is DateTime)) { _UsingDefaultValue = false; _ChangedSinceLastSerialized = true; _IsDirty = true; } return _Value; } set { _Value = value; _IsDirty = true; _ChangedSinceLastSerialized = true; _Deserialized = true; _UsingDefaultValue = false; } } public object SerializedValue { [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.SerializationFormatter)] get { if (_ChangedSinceLastSerialized) { _ChangedSinceLastSerialized = false; _SerializedValue = SerializePropertyValue(); } return _SerializedValue; } [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.SerializationFormatter)] set { _UsingDefaultValue = false; _SerializedValue = value; } } public bool Deserialized { get { return _Deserialized; } set { _Deserialized = value; } } private bool IsHostedInAspnet() { // See System.Web.Hosting.ApplicationManager::PopulateDomainBindings return AppDomain.CurrentDomain.GetData(".appDomain") != null; } private object Deserialize() { object val = null; ////////////////////////////////////////////// /// Step 1: Try creating from Serailized value if (SerializedValue != null) { try { if (SerializedValue is string) { val = GetObjectFromString(Property.PropertyType, Property.SerializeAs, (string)SerializedValue); } else { MemoryStream ms = new System.IO.MemoryStream((byte[])SerializedValue); try { val = (new BinaryFormatter()).Deserialize(ms); } finally { ms.Close(); } } } catch (Exception exception) { try { if (IsHostedInAspnet()) { object[] args = new object[] { Property, this, exception}; const string webBaseEventTypeName = "System.Web.Management.WebBaseEvent, " + AssemblyRef.SystemWeb; Type type = Type.GetType(webBaseEventTypeName, true); type.InvokeMember("RaisePropertyDeserializationWebErrorEvent", BindingFlags.NonPublic|BindingFlags.Static|BindingFlags.InvokeMethod, null, null, args, CultureInfo.InvariantCulture); } } catch { } } if (val != null && !Property.PropertyType.IsAssignableFrom(val.GetType())) // is it the correct type val = null; } ////////////////////////////////////////////// /// Step 2: Try creating from default value if (val == null) { _UsingDefaultValue = true; if (Property.DefaultValue == null || Property.DefaultValue.ToString() == "[null]") { if (Property.PropertyType.IsValueType) return Activator.CreateInstance(Property.PropertyType); else return null; } if (!(Property.DefaultValue is string)) { val = Property.DefaultValue; } else { try { val = GetObjectFromString(Property.PropertyType, Property.SerializeAs, (string)Property.DefaultValue); } catch(Exception e) { throw new ArgumentException(SR.GetString(SR.Could_not_create_from_default_value, Property.Name, e.Message)); } } if (val != null && !Property.PropertyType.IsAssignableFrom(val.GetType())) // is it the correct type throw new ArgumentException(SR.GetString(SR.Could_not_create_from_default_value_2, Property.Name)); } ////////////////////////////////////////////// /// Step 3: Create a new one by calling the parameterless constructor if (val == null) { if (Property.PropertyType == typeof(string)) { val = ""; } else { try { val = Activator.CreateInstance(Property.PropertyType); } catch {} } } return val; } private static object GetObjectFromString(Type type, SettingsSerializeAs serializeAs, string attValue) { // Deal with string types if (type == typeof(string) && (attValue == null || attValue.Length < 1 || serializeAs == SettingsSerializeAs.String)) return attValue; // Return null if there is nothing to convert if (attValue == null || attValue.Length < 1) return null; // Convert based on the serialized type switch (serializeAs) { case SettingsSerializeAs.Binary: byte[] buf = Convert.FromBase64String(attValue); MemoryStream ms = null; try { ms = new System.IO.MemoryStream(buf); return (new BinaryFormatter()).Deserialize(ms); } finally { if (ms != null) ms.Close(); } case SettingsSerializeAs.Xml: StringReader sr = new StringReader(attValue); XmlSerializer xs = new XmlSerializer(type); return xs.Deserialize(sr); case SettingsSerializeAs.String: TypeConverter converter = TypeDescriptor.GetConverter(type); if (converter != null && converter.CanConvertTo(typeof(String)) && converter.CanConvertFrom(typeof(String))) return converter.ConvertFromInvariantString(attValue); throw new ArgumentException(SR.GetString(SR.Unable_to_convert_type_from_string, type.ToString()), "type"); default: return null; } } private object SerializePropertyValue() { if (_Value == null) return null; if (Property.SerializeAs != SettingsSerializeAs.Binary) return ConvertObjectToString(_Value, Property.PropertyType, Property.SerializeAs, Property.ThrowOnErrorSerializing); MemoryStream ms = new System.IO.MemoryStream(); try { BinaryFormatter bf = new BinaryFormatter(); bf.Serialize(ms, _Value); return ms.ToArray(); } finally { ms.Close(); } } private static string ConvertObjectToString(object propValue, Type type, SettingsSerializeAs serializeAs, bool throwOnError) { if (serializeAs == SettingsSerializeAs.ProviderSpecific) { if (type == typeof(string) || type.IsPrimitive) serializeAs = SettingsSerializeAs.String; else serializeAs = SettingsSerializeAs.Xml; } try { switch (serializeAs) { case SettingsSerializeAs.String: TypeConverter converter = TypeDescriptor.GetConverter(type); if (converter != null && converter.CanConvertTo(typeof(String)) && converter.CanConvertFrom(typeof(String))) return converter.ConvertToInvariantString(propValue); throw new ArgumentException(SR.GetString(SR.Unable_to_convert_type_to_string, type.ToString()), "type"); case SettingsSerializeAs.Binary : MemoryStream ms = new System.IO.MemoryStream(); try { BinaryFormatter bf = new BinaryFormatter(); bf.Serialize(ms, propValue); byte[] buffer = ms.ToArray(); return Convert.ToBase64String(buffer); } finally { ms.Close(); } case SettingsSerializeAs.Xml : XmlSerializer xs = new XmlSerializer(type); StringWriter sw = new StringWriter(CultureInfo.InvariantCulture); xs.Serialize(sw, propValue); return sw.ToString(); } } catch (Exception) { if (throwOnError) throw; } return null; } private object _Value = null; private object _SerializedValue = null; private bool _Deserialized = false; private bool _IsDirty = false; private SettingsProperty _Property = null; private bool _ChangedSinceLastSerialized = false; private bool _UsingDefaultValue = true; } }
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