Question

我有一些会计应用程序允许创建文档并添加一些位置（行/行）。这是控制器获取特定文档的那些行：

public JsonResult GetIncDocDetails(long id, int pagesize, int pagenum)
    {   
        var dbResult = db.fooIncDocDetail.Where(d => d.DocumentID == id).Where(d => d.RecordStatusID != 2).Include(f => f.fooFood).
                             OrderBy(d => d.Date).
                             Select(s => new
                             {
                                 s.IncDocDetailID,
                                 s.FoodID,
                                 s.MeasureUnit,
                                 s.Amount,
                                 s.Price,
                                 s.VATRate,         
                                 s.Excise,
                                 s.DocumentID,
                                 s.UserID,
                                 s.RecordDate,             
                                 s.RecordStatusID,
                                 s.Date,
                                 s.FoodName,
                                 s.DetailNumber,
                                 fooFoodName = s.fooFood.Name
                             }).Skip(pagesize * pagenum).Take(pagesize);

        return Json(dbResult, JsonRequestBehavior.AllowGet);
    }

所以我希望通过这个控制器获得更多信息，例如：

此特定文档的所有行的总和：

Summa = db.fooIncDocDetail.Where(d => d.DocumentID == id).
                    Where(d => d.RecordStatusID == 1).
                    Sum(a => (decimal?)(a.Amount* a.Price)) ?? 0;

此特定文档的所有行的总计数：

Total = db.fooIncDocDetail.Where(d => d.DocumentID == id).
                    Where(d => d.RecordStatusID != 2)
                    .Count()

此特定文件的属性：

Document = db.fooDocument.Where(d => d.DocumentID == id).
                                        Select(d => new
                                        {
                                            d.DocumentID,
                                            d.DocDate,
                                            d.RegNumber,
                                            d.UserID,
                                            d.RecordDate,
                                            d.RecordStatusID,
                                            d.RegistrationDate,
                                            d.Number,
                                            d.Description,
                                            d.ObjectID,
                                            d.DocumentTypeID,
                                            d.ContragentName,
                                            DocumentTypeName = d.fooDocumentType.Name
                                        })

但是我如何才能在一个LINQ查询中组合所有这些，我首先写的？感谢

Answer 1

基本上，您可以将所有详细信息查询嵌入到最后一个查询Select中，方法是将它们投影到匿名或特定创建类型的属性中，因此原始的（1）和（2）成为（3）的子查询。只需更改d变量以避免冲突，例如：

// The original query. Must be declared here and put into variable
// to avoid exception due to `Skip` / `Take` subquery processing EF bug
// It still will be executed as part of the other query
var details = ...;

var result = db.fooDocument
    .Where(d => d.DocumentID == id).
    .Select(doc => new
    {
        Document = new
        {
            doc.DocumentID,
            doc.DocDate,
            doc.RegNumber,
            doc.UserID,
            doc.RecordDate,
            doc.RecordStatusID,
            doc.RegistrationDate,
            doc.Number,
            doc.Description,
            doc.ObjectID,
            doc.DocumentTypeID,
            doc.ContragentName,
            DocumentTypeName = doc.fooDocumentType.Name
        },
        Summa = ...,
        Total = ...,
        Details = details
    })
    .FirstOrDefault();

结合不同的查询

1 个答案: