String Expression Converter

StrExprConverter.cs

namespace StringExprConverter
{
    class StringExprConverter
    {
        public static Object Format(String str, Type type)
        {
            if (String.IsNullOrEmpty(str))
                return null;
            if (type == null)
                return str;
            if (type.IsArray)
            {
                Type elementType = type.GetElementType();
                String[] strs = str.Split(new char[] { ',' });
                Array array = Array.CreateInstance(elementType, strs.Length);
                for (int i = 0, c = strs.Length; i < c; ++i)
                {
                    array.SetValue(ConvertSimpleType(strs[i], elementType), i);
                }
                return array;
            }
            return ConvertSimpleType(str,type);
        }

        private static object ConvertSimpleType(object value, Type destinationType)
        {
            object returnValue;
            if ((value == null) || destinationType.IsInstanceOfType(value))
            {
                return value;
            }
            string str = value as string;
            if ((str != null) && (str.Length == 0))
            {
                return null;
            }
            TypeConverter converter = TypeDescriptor.GetConverter(destinationType);
            bool flag = converter.CanConvertFrom(value.GetType());
            if (!flag)
            {
                converter = TypeDescriptor.GetConverter(value.GetType());
            }
            if (!flag && !converter.CanConvertTo(destinationType))
            {
                throw new InvalidOperationException("Cannot convert to：" + value.ToString() + "==>" + destinationType);
            }
            try
            {
                returnValue = flag ? converter.ConvertFrom(null, null, value) : converter.ConvertTo(null, null, value, destinationType);
            }
            catch (Exception e)
            {
                throw new InvalidOperationException("Failed to convert：" + value.ToString() + "==>" + destinationType, e);
            }
            return returnValue;
        }
    }
}