Linq to sql 使用Linq到Sql的左外部联接_Linq To Sql

Linq to sql 使用Linq到Sql的左外部联接

linq-to-sql

Linq to sql 使用Linq到Sql的左外部联接,linq-to-sql,Linq To Sql,我想使用linq to sql查询，该查询将使用内部联接和左外部联接（使用.DefaultIfEmpty（）），但查询不起作用。在T-SQL中，这是一个简单的任务，这让我感到困扰。我的问题是： var results = from cy in _dc.Companies join cyv in _dc.CompanyVersions on cy.CompanyId equals cyv.Comp

我想使用linq to sql查询，该查询将使用内部联接和左外部联接（使用.DefaultIfEmpty（）），但查询不起作用。在T-SQL中，这是一个简单的任务，这让我感到困扰。我的问题是：

  var results = from cy in _dc.Companies
                      join cyv in _dc.CompanyVersions
                          on cy.CompanyId equals cyv.CompanyId
                      join cyd in _dc.CompanyDetails
                          on cyv.CompanyVersionId equals cyd.Id
                      join cd in _dc.CustomerDetails
                          on cy.CompanyId equals cd.CompanyId
                      join d in _dc.Documents
                          on cd.CustomerId equals d.CustomerId
                      join di in _dc.DocumentItems
                          on d.DocumentId equals di.DocumentId
                      join dd in _dc.DocumentDetails
                          on di.DocDetailsId equals dd.DocumentDetailsId
                      join dt in _dc.DetailTypes
                          on dd.detailTypeId equals dt.detailTypeId
                      join vt in _dc.Vats
                          on dt.VATCode equals vt.VATCode
                      join v in _dc.Vouchers.DefaultIfEmpty()
                          on dd.DocumentDetailsId equals v.DocDetailID
                      join cc in _dc.CreditCards.DefaultIfEmpty()
                          on v.CCType equals cc.CCType
                      where
                          (d.DocTypeId == 1 || d.DocTypeId == 2) && (d.DocDate >= date)     
                        &&
                          (d.DocDate < date.AddDays(1)) &&
                          (d.CompanyVersionId == cyv.CompanyVersionId)
                          && (d.isDeleted == false || d.isDeleted == null)
                      orderby d.DocNumber ascending
                      select new
                                 {
                                     d.DocumentId,
                                     d.DocNumber,
                                     d.AutUser,
                                     d.GrossAmount,
                                     d.DocTypeId,
                                     cyd.Name,
                                     cyd.AddressLine1,
                                     cyd.AddressLine2,
                                     cyd.TelephoneLine,
                                     cyd.FaxLine,
                                     v.FromVoucNbr,
                                     d.DocDate,
                                     cd.CustomerName,
                                     cd.StreetAddress,
                                     cd.City,
                                     cd.Country,
                                     dt.DetDescr,
                                     cc.CCType,
                                     dd.FreeDescr,
                                     dd.NetAmount,
                                     dd.VATAmount,
                                     vt.VATDescr,
                                     cc.Description,
                                     vt.VATRate
                                 };

var结果=来自dc公司的cy
加入cyv，加入dc.CompanyVersions
关于cy.CompanyId等于cyv.CompanyId
加入cyd in_dc CompanyDetails
在cyv.CompanyVersionId上等于cyd.Id
加入cd-in_dc.CustomerDetails
关于cy.CompanyId等于cd.CompanyId
加入d_dc文档
在cd上，CustomerId等于d.CustomerId
将di加入_dc.DocumentItems
在d.DocumentId上等于di.DocumentId
将dd加入到dc文档详细信息中
在di.DocDetailsId上等于dd.DocumentDetailsId
将dt加入到_dc.DetailTypes中
在dd.detailTypeId上等于dt.detailTypeId
加入悉尼威立雅运输公司
在dt.VATCode上等于vt.VATCode
在_dc.dictions.DefaultIfEmpty（）中加入v
在dd.DocumentDetailsId上等于v.DocDetailID
在_dc.CreditCards.DefaultIfEmpty（）中加入cc
关于v.CCType等于cc.CCType
哪里
（d.DocTypeId==1 | | d.DocTypeId==2）和&（d.DocDate>=date）
&&
（d.DocDate


有谁能建议我如何在此查询的最后两个表上使用左外部联接吗？
您将这两个表都放置了。DefaultIfEmpty错误。
我认为是这样的（尽管我不确定where子句…）
var结果=
来自cy in_dc公司
在cy.CompanyId上的_dc.CompanyVersions中加入cyv等于cyv.CompanyId
将cyd加入到cyv上的_dc.CompanyDetails中。CompanyVersionId等于cyd.Id
将cd加入到cy.CompanyId等于cd.CompanyId的客户详细信息中
在cd上的文档中加入d。CustomerId等于d.CustomerId
将di加入到d.DocumentId上的_dc.DocumentItems等于di.DocumentId
将dd加入_dc.DocumentDetails on di.DocDetailsId等于dd.DocumentDetailsId
将dt加入到dd.detailTypeId等于dt.detailTypeId的_dc.DetailTypes中
将vt加入到dt上的_dc.Vats中。VATCode等于vt.VATCode
将dd.DocumentDetailsId等于v.DocDetailID的凭证加入到other1中
来自other1.DefaultIfEmpty（）中的o1
加入cc in _dc.CreditCards on v.CCType等于cc.CCType进入其他2
来自other2.DefautlIfEmtpy（）中的o2
其中（d.DocTypeId==1 | | d.DocTypeId==2）
&&（d.DocDate>=日期）
&&（d.DocDate
是的联接顺序不正确，我现在已经修复了它，这是正在工作和编译的查询：
另外，谢谢大家的帮助
  var results =
            from cy in _dc.Companies
            join cyv in _dc.CompanyVersions on cy.CompanyId equals cyv.CompanyId
            join cyd in _dc.CompanyDetails on cyv.CompanyVersionId equals cyd.Id
            join cd in _dc.CustomerDetails on cy.CompanyId equals cd.CompanyId
            join d in _dc.Documents on cd.CustomerId equals d.CustomerId
            join di in _dc.DocumentItems on d.DocumentId equals di.DocumentId
            join dd in _dc.DocumentDetails on di.DocDetailsId equals    
            dd.DocumentDetailsId
            join dt in _dc.DetailTypes on dd.detailTypeId equals dt.detailTypeId
            join vt in _dc.Vats on dt.VATCode equals vt.VATCode
            join v in _dc.Vouchers on dd.DocumentDetailsId equals v.DocDetailID into 
            other1
            from o1 in other1.DefaultIfEmpty()
            join cc in _dc.CreditCards on o1.CCType equals cc.CCType into other2
            from o2 in other2.DefaultIfEmpty()
            where (d.DocTypeId == 1 || d.DocTypeId == 2)
                  && (d.DocDate >= date)
                  && (d.DocDate < date.AddDays(1))
                  && (d.CompanyVersionId == cyv.CompanyVersionId)
                  && (d.isDeleted == false || d.isDeleted == null)
            orderby d.DocNumber ascending
            select new
                       {
                           d.DocumentId,
                           d.DocNumber,
                           d.AutUser,
                           d.GrossAmount,
                           d.DocTypeId,
                           cyd.Name,
                           cyd.AddressLine1,
                           cyd.AddressLine2,
                           cyd.TelephoneLine,
                           cyd.FaxLine,
                           o1.FromVoucNbr,
                           d.DocDate,
                           cd.CustomerName,
                           cd.StreetAddress,
                           cd.City,
                           cd.Country,
                           dt.DetDescr,
                           o2.CCType,
                           dd.FreeDescr,
                           dd.NetAmount,
                           dd.VATAmount,
                           vt.VATDescr,
                           o2.Description,
                           vt.VATRate
                       };

var结果=
来自cy in_dc公司
在cy.CompanyId上的_dc.CompanyVersions中加入cyv等于cyv.CompanyId
将cyd加入到cyv上的_dc.CompanyDetails中。CompanyVersionId等于cyd.Id
将cd加入到cy.CompanyId等于cd.CompanyId的客户详细信息中
在cd上的文档中加入d。CustomerId等于d.CustomerId
将di加入到d.DocumentId上的_dc.DocumentItems等于di.DocumentId
将dd加入到dc文档详细信息中
  var results =
            from cy in _dc.Companies
            join cyv in _dc.CompanyVersions on cy.CompanyId equals cyv.CompanyId
            join cyd in _dc.CompanyDetails on cyv.CompanyVersionId equals cyd.Id
            join cd in _dc.CustomerDetails on cy.CompanyId equals cd.CompanyId
            join d in _dc.Documents on cd.CustomerId equals d.CustomerId
            join di in _dc.DocumentItems on d.DocumentId equals di.DocumentId
            join dd in _dc.DocumentDetails on di.DocDetailsId equals    
            dd.DocumentDetailsId
            join dt in _dc.DetailTypes on dd.detailTypeId equals dt.detailTypeId
            join vt in _dc.Vats on dt.VATCode equals vt.VATCode
            join v in _dc.Vouchers on dd.DocumentDetailsId equals v.DocDetailID into 
            other1
            from o1 in other1.DefaultIfEmpty()
            join cc in _dc.CreditCards on o1.CCType equals cc.CCType into other2
            from o2 in other2.DefaultIfEmpty()
            where (d.DocTypeId == 1 || d.DocTypeId == 2)
                  && (d.DocDate >= date)
                  && (d.DocDate < date.AddDays(1))
                  && (d.CompanyVersionId == cyv.CompanyVersionId)
                  && (d.isDeleted == false || d.isDeleted == null)
            orderby d.DocNumber ascending
            select new
                       {
                           d.DocumentId,
                           d.DocNumber,
                           d.AutUser,
                           d.GrossAmount,
                           d.DocTypeId,
                           cyd.Name,
                           cyd.AddressLine1,
                           cyd.AddressLine2,
                           cyd.TelephoneLine,
                           cyd.FaxLine,
                           o1.FromVoucNbr,
                           d.DocDate,
                           cd.CustomerName,
                           cd.StreetAddress,
                           cd.City,
                           cd.Country,
                           dt.DetDescr,
                           o2.CCType,
                           dd.FreeDescr,
                           dd.NetAmount,
                           dd.VATAmount,
                           vt.VATDescr,
                           o2.Description,
                           vt.VATRate
                       };