如何使用 mvc 图表助手计算工作总小时数并格式化日期以仅显示 mvc 中的月份

Question

这是我目前正在运行的代码 我想知道使用 mvc 图表时这两件事是否可行？以及如何去做

我的控制器

public ActionResult CharterColumn()
{
    ArrayList xValue = new ArrayList();
    ArrayList yValue = new ArrayList();

    var results = (from c in db.Timesheets select c);

    results.ToList().ForEach(rs => xValue.Add(rs.Date));
    //I want to format this to show the only the months on the x axis

    results.ToList().ForEach(rs => yValue.Add(rs.Hours));
    //And I want to calculate the sum of the hours for each month worked by a specific employee

    new Chart(width: 800, height: 400, theme: ChartTheme.Yellow)
    .AddTitle("Test")
    .AddSeries("Default", chartType: "Column", xValue: xValue, yValues: yValue)
    .Write("bmp");

    return null;
}

和我的观点

<div>
   <img src= "@Url.Action("CharterColumn")" alt="Chart"/>
</div>

Answer 1

您可以像这样按月和年对 TimeSheet 记录进行分组：

DateTimeFormatInfo dtfi = new DateTimeFormatInfo();

// gets the records grouped based on Year and Month. 
// Creates an object of IEnumerable<IGrouping<>> type
var groupedByMonth = result
                        .OrderByDescending(x => x.Date)
                        .GroupBy(x => new { x.Date.Year, x.Date.Month }).ToList();


// gets the months names in a list
List<string> monthNames = groupedByMonth
                    .Select(a => dtfi.GetAbbreviatedMonthName(a.Key.Month))
                    .ToList();

// gets the total hours per month
List<int> hoursPerMonth = groupedByMonth
                        .Select(a => a.Sum(p => p.Hours))
                        .ToList();


ArrayList xValue = new ArrayList(monthNames);
ArrayList yValue = new ArrayList(hoursPerMonth);

我正在使用 DateTimeFormatInfo 来获取月份的名称。你也可以在没有这个的情况下实现这一点：

List<string> monthNames = groupedByMonth
                    .Select(a => a.FirstOrDefault().Date.ToString("MMMM"))
                    .ToList();