[英]Group and Count in Entity Framework
I have a table with Logs and I am counting the Logs per day as follows: 我有一个日志表,我按如下方式计算每日日志:
// Count logs by day
IList<DataModel> models = _context.Logs
.Where(x => x.Created >= dateMinimum && x.Created <= dateMaximum)
.GroupBy(x => new { Year = x.Created.Year, Month = x.Created.Month, Day = x.Created.Day })
.Select(x => new { Year = x.Key.Year, Month = x.Key.Month, Day = x.Key.Day, Count = x.Count() })
.AsEnumerable()
.Select(x => new DataModel { Date = new DateTime(x.Year, x.Month, x.Day), LogsCount = x.Count })
.ToList();
// Fill empty days with dates which contains all days in range
models.AddRange(dates.Where(x => !models.Any(y => y.Date == x.Date)).Select(x => new DataModel { Date = x, LogsCount = 0 }));
This is working if I want to count all logs by day independently of the type. 如果我想按天计算所有日志而不考虑类型,这是有效的。
But I would like to count logs by day and type (Error, Warn, Info, ...). 但我想按日计算日志并输入(错误,警告,信息......)。
I tried to add x.Type to group but at the end I get only 3 items. 我试图将x.Type添加到组,但最后我只得到3个项目。
At the moment my DataModel is the following: 目前我的DataModel如下:
public class DataModel
{
public DateTime Date { get; set; }
public Int32 LogsCount { get; set; }
}
But maybe it should be something like: 但也许它应该是这样的:
public class DataModel
{
public DateTime Date { get; set; }
public KeyValuePair<String, Int32> LogsCount { get; set; }
}
Where LogsCount has a string which holds the Type and Int32 which contains the count. 其中LogsCount有一个字符串,其中包含Type和Int32,其中包含计数。
How can I do this? 我怎样才能做到这一点?
Might want to consider using entity functions for grouping by date. 可能要考虑使用实体函数按日期分组。
Example: 例:
var results = query.GroupBy(r => new
{
SentDate = System.Data.Objects.EntityFunctions.TruncateTime(r.Launch.EmailDeliveredDate),
EventSubTypeID = r.EmailEventSubtypeID
})
.Select(x => new
{
x.Key.SentDate,
x.Key.EventSubTypeID,
NumResults = x.Count()
})
.ToList();
Did you try something like this? 你尝试过这样的事吗?
IList<DataModel> models = Logs
.Where(x => x.Created >= dateMinimum && x.Created <= dateMaximum)
.GroupBy(x => new { Year = x.Created.Year, Month = x.Created.Month, Day = x.Created.Day, Type = x.Type })
.Select(x => new { Year = x.Key.Year, Month = x.Key.Month, Day = x.Key.Day, Count = x.Count(), Type = x.Key.Type })
.AsEnumerable()
.Select(x => new DataModel { Date = new DateTime(x.Year, x.Month, x.Day), LogsCount = x.Count, Type = x.Type })
.ToList()
public class DataModel
{
public DateTime Date { get; set; }
public Int32 LogsCount { get; set; }
public string Type { get; set; }
}
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