private DbValueConverter BuildNullableValueConverter(Type nullablePropertyType, DbValueConverter baseConv = null)
{
var valueFromNullable = BuildNullableValueReader(nullablePropertyType);
Type colType;
ConvertFunc propToColFunc;
ConvertFunc colToPropFunc;
if (baseConv == null)
{
colType = baseConv == null?nullablePropertyType.GetUnderlyingType() : baseConv.ColumnType;
propToColFunc =
x => x == null || x == DBNull.Value ?
x :
x.GetType().IsValueType ? x : valueFromNullable(x);
colToPropFunc = x => x;
}
else
{
colType = nullablePropertyType.GetUnderlyingType();
propToColFunc =
x => x == null || x == DBNull.Value ?
x :
x.GetType().IsValueType ? baseConv.PropertyToColumn(x) :
baseConv.PropertyToColumn(valueFromNullable(x));
colToPropFunc = baseConv.ColumnToProperty;
}
var convObj = new DbValueConverter(colType, nullablePropertyType, colToPropFunc, propToColFunc);
return(convObj);
}
private void AddWithLock(DbValueConverter convertInfo)
{
lock (_lock) {
var types = new TypeTuple(convertInfo.ColumnType, convertInfo.PropertyType);
_converters[types] = convertInfo;
}
}
public DbValueConverter AddConverter(Type columnType, Type propertyType, ConvertFunc columnToProperty, ConvertFunc propertyToColumn)
{
var conv = new DbValueConverter(columnType, propertyType, columnToProperty, propertyToColumn);
AddWithLock(conv);
return(conv);
}
private DbValueConverter BuildEnumValueConverter(Type columnType, Type enumType)
{
var colToEnum = BuildIntToEnum(columnType, enumType);
var enumToCol = BuildEnumToInt(columnType, enumType);
ConvertFunc entToDbFunc = x => Convert.ChangeType(x, columnType);
var convObj = new DbValueConverter(columnType, enumType, (ConvertFunc)colToEnum, (ConvertFunc)enumToCol);
return(convObj);
}
protected DbValueConverter AddDefaultConverter(Type fromType, Type toType)
{
var conv = new DbValueConverter(fromType, toType, BuildImplicitConverter(fromType, toType), BuildImplicitConverter(toType, fromType));
AddWithLock(conv);
//Test
var fromV = Activator.CreateInstance(fromType);
var toV = conv.ColumnToProperty(fromV);
fromV = conv.PropertyToColumn(toV);
return(conv);
}
