根据日历年排序月份

Question

I currently have some code that can sort strings in alphabetic order. I would like for it to sort the months according to the calendar year. I have seen ways to do it on this website but cant apply them to my code specifically. What would I need to add to make it sort in order (January, February etc etc).

Code to read months to array:

var month1Values = File
    .ReadAllLines(monthFilePath)
    .Select(x => new { Name = monthFilePath, Sort = DateTime.ParseExact(x, "MMMM", CultureInfo.InvariantCulture) })
    .ToArray(); 

Code to sort:

if (SortFile == 3)
{                 
    comparison1 = string.Compare(fileData[index].MonthValues, 
        fileData[index + 1].MonthValues) > 0;

    if (comparison1)
    {
        temp = fileData[index].MonthValues;
        fileData[index].MonthValues = fileData[index + 1].MonthValues;
        fileData[index + 1].MonthValues = temp;
        swap = true;
     }
 } 

Error appears where asterix is:

for (var index = 0; index < datasize; index++)
            {
                fileData[index] = new FileData
                {
            DayValues = day1Values[index],
            MonthValues = *month1Values[index]*,

                 };
            }

Error reads cannot convert type '< annonymous type: string Name, System.DateTime Sort >' to 'string'. How do I fix this problem?

Answer 1

You are creating anonymous data types in your Select instruction (first code box, line 3) instead of relying on DateTime type. The runtime don't know how to cast your anonymous type to String .

This should work as expected:

.Select(x => DateTime.ParseExact(x, "MMMM", CultureInfo.InvariantCulture))

Be aware that normal DateTime -> String cast involves creating a full date from only month given; this involves assuming that day and year is current with hour, minute and second zeroed out.