使用 MyModel 进行 linq 查询

发布于 2024-10-26 07:58:42 字数 720 浏览 1 评论 0原文

我有一个对象模型，我希望用 linq 查询填充它。

MyModel{
DateTime AppointDate {get; set;}
int TotalAppoints {get; set;}
int AppointDuration {get; set;}
}

我正在编写的查询返回特定日期的约会计数，并且位于接收 UserID 和日期作为参数的函数中。 MyDC 是数据上下文。

到目前为止，这就是我所拥有的：

var Output = from a in MyDC.AppointTable
             where a.UserID == TheUserID
             where a.Date == TheDate.Date
             select new MyModel
             {
                AppointDate = ?,

                TotalAppoints =?,

                AppointDuration = ?
             };

现在，我已经尝试了一些方法，但它没有返回预期的结果。当我写 a.Count() 时，我没有得到计数。每个约会都有一个 int 来存储该约会的分钟数； TotalAppoints 应该是约会的计数，AppointDuration 应该保存约会所花费的所有分钟数。感谢您的意见。

原文

I have an object model and I'm looking to populate it with a linq query.

MyModel{
DateTime AppointDate {get; set;}
int TotalAppoints {get; set;}
int AppointDuration {get; set;}
}

The query I'm writing is returning the count of appointments for a specific date and is in a function that receives the UserID and the date as parameters. MyDC is the data context.

So far, this is what I have:

var Output = from a in MyDC.AppointTable
             where a.UserID == TheUserID
             where a.Date == TheDate.Date
             select new MyModel
             {
                AppointDate = ?,

                TotalAppoints =?,

                AppointDuration = ?
             };

For now, I've tried a few things but it's not returning what's expected. When I write a.Count() I'm not getting the count. Each appointment has an int that stores the number of minutes for that appointment; TotalAppoints is supposed to be the count of appointments and AppointDuration is supposed to hold the count of all the minutes spent in appointments. Thanks for your input.

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寻梦旅人 2024-11-02 07:58:42

您想要做的是将数据按该字段分组并对值进行求和

var out = from a in MyDC.AppointTable
            where a.UserID == TheUserID
            where a.Date == TheDate.Date
            group a by a.Date into g
            select new MyModel {
               AppointDate = TheDate.Date,
               TotalAppoints = g.Count(),
               AppointDuration = g.sum( x => x.AppointDuration )
            };

What you want to do is group your data by that field and sum across the values

var out = from a in MyDC.AppointTable
            where a.UserID == TheUserID
            where a.Date == TheDate.Date
            group a by a.Date into g
            select new MyModel {
               AppointDate = TheDate.Date,
               TotalAppoints = g.Count(),
               AppointDuration = g.sum( x => x.AppointDuration )
            };

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