实体框架-将多条记录连接到一条记录

Question

I have one table that name is A that is master, another table that name is B is detail

In A and BI have below records:

A table:

Id    Name         Family
-------------------------
 1   Ebrahim      Golkhani
 2   Javad        Nasiri

in B table:

AId    FactorName       Value
------------------------
 1     BaseSalary       1000
 1     Tax              10
 1     Insurance        20
 2     BaseSalary       2000
 2     Tax              50
 2     Insurance        30

I want to retrieve data like this:

Name     Family     BaseSalary    Tax     Insurance ....
--------------------------------------------------------
Ebrahim  Golkhani   1000          10      20
Javad    Nasiri     2000          50      30

record in table b is dynamic, this means that factor name is not static.

I want to implement this in Entity Framework.

Answer 1

tableA.Join(TableB,x=>x.Aid,y=>y.Aid, (x,y) => new { name = x.name,family = x.family,
                        BaseSalary = y.Where(x.FactorName=="BaseSalary").First().Value,
                        Tax = y.Where(x.FactorName=="Tax").First().Value,
                        Insurance = y.Where(x.FactorName=="Insurance").First().Value
                        //.....
    }).ToList()

Answer 2

You can try this.

var results  =  from g in tab2.GroupBy(k => k.AId)
                join t1 in tab1 on g.Key equals t1.Id
                select new
                {
                    t1.Name,
                    t1.Family,
                    BaseSalary = g.SingleOrDefault(c=>c.FactorName.Equals("BaseSalary")).Value, 
                    Insurance = g.SingleOrDefault(c => c.FactorName.Equals("Insurance")).Value,
                    Tax = g.SingleOrDefault(c => c.FactorName.Equals("Tax")).Value,
                };

Please note , this is not validating nulls in your table, I'm leaving it to you to add those validations

Working Sample attached.