Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DLinq / Dlinq / DbConvert.cs / 1305376 / DbConvert.cs
using System.Data.Common; using System.Data.SqlClient; using System.Linq.Expressions; using System.IO; using System.Reflection; using System.Text; using System.Runtime.Serialization.Formatters.Binary; using System.Linq; using System.Collections.Generic; using System.Collections; using System.Diagnostics.CodeAnalysis; namespace System.Data.Linq { public static class DBConvert { private static Type[] StringArg = new Type[] { typeof(string) }; [SuppressMessage("Microsoft.Design", "CA1004:GenericMethodsShouldProvideTypeParameter", Justification = "[....]: Generic parameters are required for strong-typing of the return type.")] public static T ChangeType(object value) { return (T)ChangeType(value, typeof(T)); } [SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily", Justification = "[....]: Cast is dependent on node type and casts do not happen unecessarily in a single code path.")] [SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity", Justification = "These issues are related to our use of if-then and case statements for node types, which adds to the complexity count however when reviewed they are easy to navigate and understand.")] public static object ChangeType(object value, Type type) { if (value == null) return null; MethodInfo mi; Type toType = System.Data.Linq.SqlClient.TypeSystem.GetNonNullableType(type); Type fromType = value.GetType(); if (toType.IsAssignableFrom(fromType)) return value; if (toType == typeof(Binary)) { if (fromType == typeof(byte[])) { return new Binary((byte[])value); } else if (fromType == typeof(Guid)) { return new Binary(((Guid)value).ToByteArray()); } else { BinaryFormatter formatter = new BinaryFormatter(); byte[] streamArray; using (MemoryStream stream = new MemoryStream()) { formatter.Serialize(stream, value); streamArray = stream.ToArray(); } return new Binary(streamArray); } } else if (toType == typeof(byte[])) { if (fromType == typeof(Binary)) { return ((Binary)value).ToArray(); } else if (fromType == typeof(Guid)) { return ((Guid)value).ToByteArray(); } else { BinaryFormatter formatter = new BinaryFormatter(); byte[] returnValue; using (MemoryStream stream = new MemoryStream()) { formatter.Serialize(stream, value); returnValue = stream.ToArray(); } return returnValue; } } else if (fromType == typeof(byte[])) { if (toType == typeof(Guid)) { return new Guid((byte[])value); } else { BinaryFormatter formatter = new BinaryFormatter(); object returnValue; using (MemoryStream stream = new MemoryStream((byte[])value)) { returnValue = ChangeType(formatter.Deserialize(stream), toType); } return returnValue; } } else if (fromType == typeof(Binary)) { if (toType == typeof(Guid)) { return new Guid(((Binary)value).ToArray()); } else { BinaryFormatter formatter = new BinaryFormatter(); using (MemoryStream stream = new MemoryStream(((Binary)value).ToArray(), false)) { return ChangeType(formatter.Deserialize(stream), toType); } } } else if (toType.IsEnum) { if (fromType == typeof(string)) { string text = ((string)value).Trim(); return Enum.Parse(toType, text); } else { return Enum.ToObject(toType, Convert.ChangeType(value, Enum.GetUnderlyingType(toType), Globalization.CultureInfo.InvariantCulture)); } } else if (fromType.IsEnum) { if (toType == typeof(string)) { return Enum.GetName(fromType, value); } else { return Convert.ChangeType(Convert.ChangeType(value, Enum.GetUnderlyingType(fromType), Globalization.CultureInfo.InvariantCulture), toType, Globalization.CultureInfo.InvariantCulture); } } else if (toType == typeof(TimeSpan)) { if (fromType == typeof(string)) { return TimeSpan.Parse(value.ToString(), Globalization.CultureInfo.InvariantCulture); } else if (fromType == typeof(DateTime)) { return DateTime.Parse(value.ToString(), Globalization.CultureInfo.InvariantCulture).TimeOfDay; } else if (fromType == typeof(DateTimeOffset)) { return DateTimeOffset.Parse(value.ToString(), Globalization.CultureInfo.InvariantCulture).TimeOfDay; } else { return new TimeSpan((long)Convert.ChangeType(value, typeof(long), Globalization.CultureInfo.InvariantCulture)); } } else if (fromType == typeof(TimeSpan)) { if (toType == typeof(string)) { return ((TimeSpan)value).ToString("", Globalization.CultureInfo.InvariantCulture); } else if (toType == typeof(DateTime)) { DateTime dt = new DateTime(); return dt.Add((TimeSpan)value); } else if (toType == typeof(DateTimeOffset)) { DateTimeOffset dto = new DateTimeOffset(); return dto.Add((TimeSpan)value); } else { return Convert.ChangeType(((TimeSpan)value).Ticks, toType, Globalization.CultureInfo.InvariantCulture); } } else if (toType == typeof(DateTime) && fromType == typeof(DateTimeOffset)) { return ((DateTimeOffset)value).DateTime; } else if (toType == typeof(DateTimeOffset) && fromType == typeof(DateTime)) { return new DateTimeOffset((DateTime)value); } else if (toType == typeof(string) && !(typeof(IConvertible).IsAssignableFrom(fromType))) { if (fromType == typeof(char[])) { return new String((char[])value); } else { return value.ToString(); } } else if (fromType == typeof(string)) { if (toType == typeof(Guid)) { return new Guid((string)value); } else if (toType == typeof(char[])) { return ((String)value).ToCharArray(); } else if (toType == typeof(System.Xml.Linq.XDocument) && (string)value == string.Empty) { return new System.Xml.Linq.XDocument(); } else if (!(typeof(IConvertible).IsAssignableFrom(toType)) && (mi = toType.GetMethod("Parse", BindingFlags.Static | BindingFlags.Public, null, StringArg, null)) != null) { try { return mi.Invoke(null, new object[] { value }); } catch (TargetInvocationException t) { throw t.GetBaseException(); } } else { return Convert.ChangeType(value, toType, Globalization.CultureInfo.InvariantCulture); } } else if (toType.IsGenericType && toType.GetGenericTypeDefinition() == typeof(IQueryable<>) && typeof(IEnumerable<>).MakeGenericType(toType.GetGenericArguments()[0]).IsAssignableFrom(fromType) ) { return Queryable.AsQueryable((IEnumerable)value); } else { try { return Convert.ChangeType(value, toType, Globalization.CultureInfo.InvariantCulture); } catch (InvalidCastException) { throw Error.CouldNotConvert(fromType, toType); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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