private static bool EqualsFormattedNullValue(
object value,
object formattedNullValue,
IFormatProvider formatInfo)
{
if (formattedNullValue is string && value is string)
{
return(string.Compare((string)value, (string)formattedNullValue, true, Formatter.GetFormatterCulture(formatInfo)) == 0);
}
return(object.Equals(value, formattedNullValue));
}
private static object FormatObjectInternal(
object value,
System.Type targetType,
TypeConverter sourceConverter,
TypeConverter targetConverter,
string formatString,
IFormatProvider formatInfo,
object formattedNullValue)
{
if (value == DBNull.Value || value == null)
{
if (formattedNullValue != null)
{
return(formattedNullValue);
}
if ((object)targetType == (object)Formatter.stringType)
{
return((object)string.Empty);
}
if ((object)targetType == (object)Formatter.checkStateType)
{
return((object)CheckState.Indeterminate);
}
return((object)null);
}
if ((object)targetType == (object)Formatter.stringType && value is IFormattable && !string.IsNullOrEmpty(formatString))
{
return((object)(value as IFormattable).ToString(formatString, formatInfo));
}
System.Type type = value.GetType();
TypeConverter converter1 = TypeDescriptor.GetConverter(type);
if (sourceConverter != null && sourceConverter != converter1 && sourceConverter.CanConvertTo(targetType))
{
return(sourceConverter.ConvertTo((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), value, targetType));
}
TypeConverter converter2 = TypeDescriptor.GetConverter(targetType);
if (targetConverter != null && targetConverter != converter2 && targetConverter.CanConvertFrom(type))
{
return(targetConverter.ConvertFrom((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), value));
}
if ((object)targetType == (object)Formatter.checkStateType)
{
if ((object)type == (object)Formatter.booleanType)
{
return((object)(CheckState)((bool)value ? 1 : 0));
}
if (sourceConverter == null)
{
sourceConverter = converter1;
}
if (sourceConverter != null && sourceConverter.CanConvertTo(Formatter.booleanType))
{
return((object)(CheckState)((bool)sourceConverter.ConvertTo((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), value, Formatter.booleanType) ? 1 : 0));
}
}
if (targetType.IsAssignableFrom(type))
{
return(value);
}
if (sourceConverter == null)
{
sourceConverter = converter1;
}
if (targetConverter == null)
{
targetConverter = converter2;
}
if (sourceConverter != null && sourceConverter.CanConvertTo(targetType))
{
return(sourceConverter.ConvertTo((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), value, targetType));
}
if (targetConverter != null && targetConverter.CanConvertFrom(type))
{
return(targetConverter.ConvertFrom((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), value));
}
if (!(value is IConvertible))
{
throw new FormatException(Formatter.GetCantConvertMessage(value, targetType));
}
return(Formatter.ChangeType(value, targetType, formatInfo));
}
private static object ParseObjectInternal(
object value,
System.Type targetType,
System.Type sourceType,
TypeConverter targetConverter,
TypeConverter sourceConverter,
IFormatProvider formatInfo,
object formattedNullValue)
{
if (Formatter.EqualsFormattedNullValue(value, formattedNullValue, formatInfo) || value == DBNull.Value)
{
return((object)DBNull.Value);
}
TypeConverter converter1 = TypeDescriptor.GetConverter(targetType);
if (targetConverter != null && converter1 != targetConverter && targetConverter.CanConvertFrom(sourceType))
{
return(targetConverter.ConvertFrom((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), value));
}
TypeConverter converter2 = TypeDescriptor.GetConverter(sourceType);
if (sourceConverter != null && converter2 != sourceConverter && sourceConverter.CanConvertTo(targetType))
{
return(sourceConverter.ConvertTo((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), value, targetType));
}
if (value is string)
{
object method = Formatter.InvokeStringParseMethod(value, targetType, formatInfo);
if (method != Formatter.parseMethodNotFound)
{
return(method);
}
}
else if (value is CheckState)
{
CheckState checkState = (CheckState)value;
if (checkState == CheckState.Indeterminate)
{
return((object)DBNull.Value);
}
if ((object)targetType == (object)Formatter.booleanType)
{
return((object)(checkState == CheckState.Checked));
}
if (targetConverter == null)
{
targetConverter = converter1;
}
if (targetConverter != null && targetConverter.CanConvertFrom(Formatter.booleanType))
{
return(targetConverter.ConvertFrom((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), (object)(checkState == CheckState.Checked)));
}
}
else if (value != null && targetType.IsAssignableFrom(value.GetType()))
{
return(value);
}
if (targetConverter == null)
{
targetConverter = converter1;
}
if (sourceConverter == null)
{
sourceConverter = converter2;
}
if (targetConverter != null && targetConverter.CanConvertFrom(sourceType))
{
return(targetConverter.ConvertFrom((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), value));
}
if (sourceConverter != null && sourceConverter.CanConvertTo(targetType))
{
return(sourceConverter.ConvertTo((ITypeDescriptorContext)null, Formatter.GetFormatterCulture(formatInfo), value, targetType));
}
if (!(value is IConvertible))
{
throw new FormatException(Formatter.GetCantConvertMessage(value, targetType));
}
return(Formatter.ChangeType(value, targetType, formatInfo));
}
