LinQ[持续更新]

 var query = from t1_row in eprg.AttestationConditions 
                            where t1_row.Attestation.ProviderNumber == providerNumber
                            select t1_row.ConditionId;

1.基本查询

from 临时变量 in 集合

where 临时变量的属性==某个值.

select 临时变量.属性/ new 对象{...,...}

2. Join

var query = from a in eprg.AuthRules
                        join t in eprg.ProgramGroup on a.Program_Code equals t.programCode
                        where a.Active.Value == true && a.Svc_Type == serviceTypeCode
                        select new AuthRuleView
                        {
                            CPTCodes = a.CPT_Codes,
                            ServiceGroupId = a.Svc_Group_Id,
                            ProgramGroups = t.Groups,
                            ActionCode = a.Action_Code,
                            RuleMessage = a.Rule_Message
                        };

from 临时变量1 in 集合1 

Join 临时变量2 in 集合2

on 临时变量1的属性 equals 临时变量2的属性.　　

3.Group By