C# 实体框架未处理Linq查询
我一直在搜索LINQ to实体不识别方法主题,这些主题被广泛讨论。听起来好像我的C代码无法转换为实体处理的查询。。。问题是我对这个框架还不够好,无法理解它到底是如何工作的。 谁能帮助我理解为了修复我的代码必须更改什么 我正在选择受益人/个人/公司并关联他们的姓名 代码如下:C# 实体框架未处理Linq查询,c#,entity-framework,linq,C#,Entity Framework,Linq,我一直在搜索LINQ to实体不识别方法主题,这些主题被广泛讨论。听起来好像我的C代码无法转换为实体处理的查询。。。问题是我对这个框架还不够好,无法理解它到底是如何工作的。 谁能帮助我理解为了修复我的代码必须更改什么 我正在选择受益人/个人/公司并关联他们的姓名 代码如下: var context = Context as OracleDataContextCommon; List<Dictionary<Beneficiary, string>>
var context = Context as OracleDataContextCommon;
List<Dictionary<Beneficiary, string>> BeneficiaryList = new List<Dictionary<Beneficiary, string>>();
Dictionary<Beneficiary, string> BeneficiaryPerson = new Dictionary<Beneficiary, string>();
Dictionary<Beneficiary, string> BeneficiaryCompany = new Dictionary<Beneficiary, string>();
//Let's select all persons that are not listed as Health Partner
BeneficiaryPerson = (from bnf in context.Beneficiary
where bnf.HmcBen == 0
from pers in context.Person
where pers.PersonId == bnf.PerId
orderby pers.Lastname
group new { bnf, pers } by new { bnf.LUP_DATE, pers.PersonId} into grp
let earliest = grp.Max(o => o.bnf.LUP_DATE)
select new
{
beneficiary = grp.Where(x => x.bnf.LUP_DATE == earliest).Select(x => x.bnf).FirstOrDefault(),
name = string.Format("{0} {1}", grp.Select(x => x.pers.Firstname).FirstOrDefault(), grp.Select(x => x.pers.Lastname).FirstOrDefault())
})
.ToDictionary(x => new Beneficiary() {
BnfId = x.beneficiary.BnfId,
CodeBic = x.beneficiary.CodeBic,
IbanCode = x.beneficiary.IbanCode,
PerId = x.beneficiary.PerId,
BnkId = x.beneficiary.BnkId,
HmcBen = x.beneficiary.HmcBen
}, x => x.name);
//Let's select all companies that are not listed as Health Partner
BeneficiaryCompany = (from bnf in context.Beneficiary
where bnf.HmcBen == 0
from cie in context.Company
where cie.CompanyId == bnf.CieId
orderby cie.CompanyName
group new { bnf, cie } by new { bnf.LUP_DATE, cie.CompanyId} into grp
let earliest = grp.Max(o => o.bnf.LUP_DATE)
select new
{
beneficiary = grp.Where(x => x.bnf.LUP_DATE == earliest).Select(x => x.bnf).FirstOrDefault(),
name = grp.Select(x => x.cie.CompanyName).FirstOrDefault()
})
.ToDictionary(x => new Beneficiary(){
BnfId = x.beneficiary.BnfId,
CodeBic = x.beneficiary.CodeBic,
IbanCode = x.beneficiary.CodeBic,
CieId = x.beneficiary.CieId,
BnkId = x.beneficiary.BnkId,
HmcBen = x.beneficiary.HmcBen
}, x => x.name );
BeneficiaryList.Add(BeneficiaryPerson);
BeneficiaryList.Add(BeneficiaryCompany);
return BeneficiaryList;
实体框架/Linq到Sql无法将String.Format转换为Sql。。简而言之,除非您知道自己在内存中,否则不要使用它。实体框架/Linq to Sql无法将String.Format转换为Sql。。简而言之,除非您知道自己在内存中,否则不要使用它。实际上,框架无法处理'string.Format'。。。谢谢你,伙计!:-事实上,框架无法处理'string.Format'。。。谢谢你,伙计!:-