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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 = "Microsoft: Generic parameters are required for strong-typing of the return type.")]
public static T ChangeType<T>(object value) {
return (T)ChangeType(value, typeof(T));
}
[SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily", Justification = "Microsoft: 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 SecurityUtils.MethodInfoInvoke(mi, 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);
}
}
}
}
}
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