Question

查询工作正常，除了它只提取一个月有超过零事件的值，例如，如果1月没有值，则它不显示1月。我想展示几个月。

var result = tIncidentReportings
    .AsEnumerable()
    .GroupBy(c => c.Date.ToString("MMM"))
    .Select(g => new { Month = g.Key, Count = g.Count() })
    .OrderBy(x => DateTime.ParseExact((x.Month).ToString(), "MMM", CultureInfo.InvariantCulture));

Answer 1

问题是，无论几个月没有任何报告，你都会错过几个月。您必须检查哪些月份没有，并手动添加。

var result = tIncidentReportings
    .AsEnumerable()
    .GroupBy(c => c.Date.ToString("MMM"))
    .Select(g => new { Month = g.Key, Count = g.Count() })
    .OrderBy(x => DateTime.ParseExact((x.Month).ToString(), "MMM", CultureInfo.InvariantCulture));
var months = 
System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.MonthGenitiveNames.Select(s => s.Substring(0,3)).ToList();
months.foreach(m => {
    if(!results.Select(r => r.Month).Contains(m)){
        results.Add(new {Month = m, Count = 0};
});

像这样的东西

或重写：

var months = System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.MonthGenitiveNames.Select(s => s.Substring(0,3)).ToList();
var reports = months.Select(m => 
    new { 
        Month = m, 
        Count = tIncidentReportings.AsEnumerable().Where(i => i.Date.ToString("MMM") == m).Count()
    }
).OrderBy(x => DateTime.ParseExact((x.Month).ToString(), "MMM", CultureInfo.InvariantCulture)).ToList();

如何显示每个月，即使本月没有数据

1 个答案: