将 SQL 查询转换为 LINQ？

Question

我知道基本的 LINQ，但我已经有几年没有使用过它了。所以我忘记了LINQ。我无法将此 SQL 查询转换为 LINQ。

   SELECT  
   [CompanyName]
  ,[ContactPerson]
  ,[Address]
  ,[Email]
  ,[InActive]
  ,(Select SUM(isnull(CreditAmount,0) - isnull(DebitAmount,0))  FROM [dbo].[SupplierTransaction] where SupplierId = s.SupplierId)  as Balance FROM [dbo].[Supplier] S

我试过了，但它不起作用

from s in Suppliers
select new
{
s.SupplierId,
s.CompanyName,
s.ContactPerson,
s.Address,
s.Email,
s.InActive,
s.BranchId,
s.CreateDate,
s.CreatedBy,
s.UpdateDate,
s.UpdatedBy,
s.PhoneNumber,
Balance = (from v in SupplierTransactions
                          where v.SupplierId ==  s.SupplierId
                          select (v.Sum(v.CreditAmount-v.DebitAmount)))
}

Answer 1

我没有测试它，但它应该看起来像这样：

var query = (from s in Suppliers 
             select new 
             {
                 SupplierId = s.SupplierId,
                 CompanyName = s.CompanyName,
                 ContactPerson = s.ContactPerson,
                 Address = s.Address,
                 Email = s.Email,
                 InActive = s.InActive,
                 BranchId = s.BranchId,
                 CreateDate = s.CreateDate,
                 CreatedBy = s.CreatedBy,
                 UpdateDate = s.UpdateDate,
                 UpdateBy = s.UpdatedBy,
                 PhoneNumber = s.PhoneNumber,
                 Balance = SupplierTransactions
                          .Where(st => st.SupplierId == s.SupplierId)
                          .Select(st => (st.CreditAmount - st.DebitAmount))
                          .Sum()
             });