DbConvert.cs source code in C# .NET

                        
Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DLinq / Dlinq / DbConvert.cs / 2 / 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 = System.Data.Linq.SqlClient.TypeSystem.GetNonNullableType(type);
            Type oType = value.GetType();
            if (type.IsAssignableFrom(value.GetType()))
                return value; 
            if (type == typeof(Binary)) {
                if (oType == typeof(byte[])) { 
                    return new Binary((byte[])value); 
                }
                else if (oType == 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 (type == typeof(byte[])) { 
                if (oType == typeof(Binary)) {
                    return ((Binary)value).ToArray(); 
                } 
                else if (oType == 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 (oType == typeof(byte[])) { 
                if (type == 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), type); 
                    }
                    return returnValue; 
                } 
            }
            else if (oType == typeof(Binary)) { 
                if (type == 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), type); 
                    }
                } 
            }
            else if (type.IsEnum) {
                if (oType == typeof(string)) {
                    string text = ((string)value).Trim(); 
                    return Enum.Parse(type, text);
                } 
                else { 
                    return Enum.ToObject(type, Convert.ChangeType(value, Enum.GetUnderlyingType(type), Globalization.CultureInfo.InvariantCulture));
                } 
            }
            else if (oType.IsEnum) {
                if (type == typeof(string)) {
                    return Enum.GetName(oType, value); 
                }
                else { 
                    return Convert.ChangeType(Convert.ChangeType(value, 
                                                                Enum.GetUnderlyingType(oType),
                                                                Globalization.CultureInfo.InvariantCulture), 
                                              type,
                                              Globalization.CultureInfo.InvariantCulture);
                }
            } 
            else if (type == typeof(TimeSpan)) {
                if (oType == typeof(string)) { 
                    return TimeSpan.Parse((string)value); 
                }
                else if (oType == typeof(DateTime)) { 
                    return DateTime.Parse(value.ToString(), Globalization.CultureInfo.InvariantCulture).TimeOfDay;
                }
                else if (oType == 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 (oType == typeof(TimeSpan)) {
                if (type == typeof(string)) {
                    return value.ToString();
                } 
                else if (type == typeof(DateTime)) {
                    DateTime dt = new DateTime(); 
                    return dt.Add((TimeSpan)value); 
                }
                else if (type == typeof(DateTimeOffset)) { 
                    DateTimeOffset dto = new DateTimeOffset();
                    return dto.Add((TimeSpan)value);
                }
                else { 
                    return Convert.ChangeType(((TimeSpan)value).Ticks, type, Globalization.CultureInfo.InvariantCulture);
                } 
            } 
            else if (type == typeof(DateTime) && oType == typeof(DateTimeOffset)) {
                return ((DateTimeOffset)value).DateTime; 
            }
            else if (type == typeof(DateTimeOffset) && oType == typeof(DateTime)) {
                return new DateTimeOffset((DateTime)value);
            } 
            else if (type == typeof(string) && !(typeof(IConvertible).IsAssignableFrom(oType))) {
                if (oType == typeof(char[])) { 
                    return new String((char[])value); 
                }
                else { 
                    return value.ToString();
                }
            }
            else if (oType == typeof(string)) { 
                if (type == typeof(Guid)) {
                    return new Guid((string)value); 
                } 
                else if (type == typeof(char[])) {
                    return ((String)value).ToCharArray(); 
                }
                else if (type == typeof(System.Xml.Linq.XDocument) && (string)value == string.Empty) {
                    return new System.Xml.Linq.XDocument();
                } 
                else if (!(typeof(IConvertible).IsAssignableFrom(type)) &&
                    (mi = type.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, type, Globalization.CultureInfo.InvariantCulture); 
                } 
            }
            else if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IQueryable<>) 
                && typeof(IEnumerable<>).MakeGenericType(type.GetGenericArguments()[0]).IsAssignableFrom(oType)
                ) {
                return Queryable.AsQueryable((IEnumerable)value);
            } 
            else {
                try { 
                    return Convert.ChangeType(value, type, Globalization.CultureInfo.InvariantCulture); 
                } catch (InvalidCastException) {
                    throw Error.CouldNotConvert(value.GetType(), type); 
                }
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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 = System.Data.Linq.SqlClient.TypeSystem.GetNonNullableType(type);
            Type oType = value.GetType();
            if (type.IsAssignableFrom(value.GetType()))
                return value; 
            if (type == typeof(Binary)) {
                if (oType == typeof(byte[])) { 
                    return new Binary((byte[])value); 
                }
                else if (oType == 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 (type == typeof(byte[])) { 
                if (oType == typeof(Binary)) {
                    return ((Binary)value).ToArray(); 
                } 
                else if (oType == 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 (oType == typeof(byte[])) { 
                if (type == 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), type); 
                    }
                    return returnValue; 
                } 
            }
            else if (oType == typeof(Binary)) { 
                if (type == 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), type); 
                    }
                } 
            }
            else if (type.IsEnum) {
                if (oType == typeof(string)) {
                    string text = ((string)value).Trim(); 
                    return Enum.Parse(type, text);
                } 
                else { 
                    return Enum.ToObject(type, Convert.ChangeType(value, Enum.GetUnderlyingType(type), Globalization.CultureInfo.InvariantCulture));
                } 
            }
            else if (oType.IsEnum) {
                if (type == typeof(string)) {
                    return Enum.GetName(oType, value); 
                }
                else { 
                    return Convert.ChangeType(Convert.ChangeType(value, 
                                                                Enum.GetUnderlyingType(oType),
                                                                Globalization.CultureInfo.InvariantCulture), 
                                              type,
                                              Globalization.CultureInfo.InvariantCulture);
                }
            } 
            else if (type == typeof(TimeSpan)) {
                if (oType == typeof(string)) { 
                    return TimeSpan.Parse((string)value); 
                }
                else if (oType == typeof(DateTime)) { 
                    return DateTime.Parse(value.ToString(), Globalization.CultureInfo.InvariantCulture).TimeOfDay;
                }
                else if (oType == 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 (oType == typeof(TimeSpan)) {
                if (type == typeof(string)) {
                    return value.ToString();
                } 
                else if (type == typeof(DateTime)) {
                    DateTime dt = new DateTime(); 
                    return dt.Add((TimeSpan)value); 
                }
                else if (type == typeof(DateTimeOffset)) { 
                    DateTimeOffset dto = new DateTimeOffset();
                    return dto.Add((TimeSpan)value);
                }
                else { 
                    return Convert.ChangeType(((TimeSpan)value).Ticks, type, Globalization.CultureInfo.InvariantCulture);
                } 
            } 
            else if (type == typeof(DateTime) && oType == typeof(DateTimeOffset)) {
                return ((DateTimeOffset)value).DateTime; 
            }
            else if (type == typeof(DateTimeOffset) && oType == typeof(DateTime)) {
                return new DateTimeOffset((DateTime)value);
            } 
            else if (type == typeof(string) && !(typeof(IConvertible).IsAssignableFrom(oType))) {
                if (oType == typeof(char[])) { 
                    return new String((char[])value); 
                }
                else { 
                    return value.ToString();
                }
            }
            else if (oType == typeof(string)) { 
                if (type == typeof(Guid)) {
                    return new Guid((string)value); 
                } 
                else if (type == typeof(char[])) {
                    return ((String)value).ToCharArray(); 
                }
                else if (type == typeof(System.Xml.Linq.XDocument) && (string)value == string.Empty) {
                    return new System.Xml.Linq.XDocument();
                } 
                else if (!(typeof(IConvertible).IsAssignableFrom(type)) &&
                    (mi = type.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, type, Globalization.CultureInfo.InvariantCulture); 
                } 
            }
            else if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IQueryable<>) 
                && typeof(IEnumerable<>).MakeGenericType(type.GetGenericArguments()[0]).IsAssignableFrom(oType)
                ) {
                return Queryable.AsQueryable((IEnumerable)value);
            } 
            else {
                try { 
                    return Convert.ChangeType(value, type, Globalization.CultureInfo.InvariantCulture); 
                } catch (InvalidCastException) {
                    throw Error.CouldNotConvert(value.GetType(), type); 
                }
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

                        

                        
                        

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