我有表格列
{provider}Enabled在代码中，我想根据输入枚举选择true/false值 - enum Provider
{
Google,
Facebook,
Twitter
}
private async Task CheckSettingsAsync(ISeedSession<IDbSession> seedSession, IUserInfo user, Provider provider){
...
var userSettingsTask = seedSession
.Query<UserSettings>()
.Where(us => us.UserId == user.UserId)
.Select(us => us.GoogleEnabled) // if provider value is "Google"
.SingleAsync();
...
}
的值
switch有没有比创建一些 <?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions targetNamespace="http://www.abc.com.tr/om/wsdl/EBS_PRODUCT_OFFER_OPERATIONS" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tns="http://www.abc.com.tr/om/wsdl/EBS_PRODUCT_OFFER_OPERATIONS" xmlns:ns="http://www.abc.com.tr/om/EBS_PRODUCT_OFFER_OPERATIONS" xmlns:fault="http://www.abc.com.tr/Fault">
<wsdl:documentation>This service provides operations to retrieve prepaid or postpaid product
details.</wsdl:documentation>
<wsdl:types>
<xs:schema targetNamespace="http://www.abc.com.tr/om/EbsProductOfferOperations" elementFormDefault="qualified">
<xs:import namespace="http://www.abc.com.tr/om/EBS_PRODUCT_OFFER_OPERATIONS" schemaLocation="../aveaXsd/EBS_PRODUCT_OFFER_OPERATIONS.xsd"/>
<xs:import namespace="http://www.abc.com.tr/Fault" schemaLocation="../aveaXsd/Fault.xsd"/>
</xs:schema>
</wsdl:types>
<wsdl:message name="RetrievePostpaidCommitmentOfferRequest">
<wsdl:part name="parameter" element="ns:RetrievePostpaidCommitmentOfferReq"/>
</wsdl:message>
<wsdl:message name="RetrievePostpaidCommitmentOfferResponse">
<wsdl:part name="parameter" element="ns:RetrievePostpaidCommitmentOfferResp"/>
</wsdl:message>
<wsdl:message name="RetrievePostpaidFreeUnitOfferRequest">
<wsdl:part name="parameter" element="ns:RetrievePostpaidFreeUnitOfferReq"/>
</wsdl:message>
<wsdl:message name="RetrievePostpaidFreeUnitOfferResponse">
<wsdl:part name="parameter" element="ns:RetrievePostpaidFreeUnitOfferResp"/>
</wsdl:message>
<wsdl:message name="RetrievePostpaidServiceOfferRequest">
<wsdl:part name="parameter" element="ns:RetrievePostpaidServiceOfferReq"/>
</wsdl:message>
<wsdl:message name="RetrievePostpaidServiceOfferResponse">
<wsdl:part name="parameter" element="ns:RetrievePostpaidServiceOfferResp"/>
</wsdl:message>
<wsdl:message name="RetrievePostpaidTariffOfferRequest">
<wsdl:part name="parameter" element="ns:RetrievePostpaidTariffOfferReq"/>
</wsdl:message>
<wsdl:message name="RetrievePostpaidTariffOfferResponse">
<wsdl:part name="parameter" element="ns:RetrievePostpaidTariffOfferResp"/>
</wsdl:message>
<wsdl:message name="RetrievePrepaidBonusOfferRequest">
<wsdl:part name="parameter" element="ns:RetrievePrepaidBonusOfferReq"/>
</wsdl:message>
<wsdl:message name="RetrievePrepaidBonusOfferResponse">
<wsdl:part name="parameter" element="ns:RetrievePrepaidBonusOfferResp"/>
</wsdl:message>
<wsdl:message name="RetrievePrepaidServiceOfferRequest">
<wsdl:part name="parameter" element="ns:RetrievePrepaidServiceOfferReq"/>
</wsdl:message>
<wsdl:message name="RetrievePrepaidServiceOfferResponse">
<wsdl:part name="parameter" element="ns:RetrievePrepaidServiceOfferResp"/>
</wsdl:message>
<wsdl:message name="RetrievePrepaidTariffOfferRequest">
<wsdl:part name="parameter" element="ns:RetrievePrepaidTariffOfferReq"/>
</wsdl:message>
<wsdl:message name="RetrievePrepaidTariffOfferResponse">
<wsdl:part name="parameter" element="ns:RetrievePrepaidTariffOfferResp"/>
</wsdl:message>
<wsdl:message name="RetrievePromotionOfferRequest">
<wsdl:part name="parameter" element="ns:RetrievePromotionOfferReq"/>
</wsdl:message>
<wsdl:message name="RetrievePromotionOfferResponse">
<wsdl:part name="parameter" element="ns:RetrievePromotionOfferResp"/>
</wsdl:message>
<wsdl:message name="CustomerProductAssignmentRequest">
<wsdl:part name="parameter" element="ns:CustomerProductAssignmentRequest"/>
</wsdl:message>
<wsdl:message name="CustomerProductAssignmentResponse">
<wsdl:part name="parameter" element="ns:CustomerProductAssignmentResponse"/>
</wsdl:message>
<wsdl:message name="FaultMessage">
<wsdl:part name="fault" element="fault:ExceptionSchema"/>
</wsdl:message>
<wsdl:portType name="EbsProductOfferOperationsPortType">
<wsdl:operation name="retrievePostpaidCommitmentOffer">
<wsdl:documentation>This method can be used to return details for postpaid commitment (Taahhüt)</wsdl:documentation>
<wsdl:input message="tns:RetrievePostpaidCommitmentOfferRequest"/>
<wsdl:output message="tns:RetrievePostpaidCommitmentOfferResponse"/>
<wsdl:fault name="fault" message="tns:FaultMessage"/>
</wsdl:operation>
<wsdl:operation name="retrievePostpaidFreeUnitOffer">
<wsdl:documentation>This method can be used to return details for postpaid freeunit</wsdl:documentation>
<wsdl:input message="tns:RetrievePostpaidFreeUnitOfferRequest"/>
<wsdl:output message="tns:RetrievePostpaidFreeUnitOfferResponse"/>
<wsdl:fault name="fault" message="tns:FaultMessage"/>
</wsdl:operation>
<wsdl:operation name="retrievePostpaidServiceOffer">
<wsdl:documentation>This method can be used to return details for a postpaid service.</wsdl:documentation>
<wsdl:input message="tns:RetrievePostpaidServiceOfferRequest"/>
<wsdl:output message="tns:RetrievePostpaidServiceOfferResponse"/>
<wsdl:fault name="fault" message="tns:FaultMessage"/>
</wsdl:operation>
<wsdl:operation name="retrievePostpaidTariffOffer">
<wsdl:documentation>This method can be used to return details for a postpaid tariff.</wsdl:documentation>
<wsdl:input message="tns:RetrievePostpaidTariffOfferRequest"/>
<wsdl:output message="tns:RetrievePostpaidTariffOfferResponse"/>
<wsdl:fault name="fault" message="tns:FaultMessage"/>
</wsdl:operation>
<wsdl:operation name="retrievePrepaidBonusOffer">
<wsdl:documentation>This method can be used to return details for a prepaid bonus.</wsdl:documentation>
<wsdl:input message="tns:RetrievePrepaidBonusOfferRequest"/>
<wsdl:output message="tns:RetrievePrepaidBonusOfferResponse"/>
<wsdl:fault name="fault" message="tns:FaultMessage"/>
</wsdl:operation>
<wsdl:operation name="retrievePrepaidServiceOffer">
<wsdl:documentation>This method can be used to return details for a prepaid service product.</wsdl:documentation>
<wsdl:input message="tns:RetrievePrepaidServiceOfferRequest"/>
<wsdl:output message="tns:RetrievePrepaidServiceOfferResponse"/>
<wsdl:fault name="fault" message="tns:FaultMessage"/>
</wsdl:operation>
<wsdl:operation name="retrievePrepaidTariffOffer">
<wsdl:documentation>This method can be used to return details for a prepaid tariff product.</wsdl:documentation>
<wsdl:input message="tns:RetrievePrepaidTariffOfferRequest"/>
<wsdl:output message="tns:RetrievePrepaidTariffOfferResponse"/>
<wsdl:fault name="fault" message="tns:FaultMessage"/>
</wsdl:operation>
<wsdl:operation name="retrievePromotionOffer">
<wsdl:input message="tns:RetrievePromotionOfferRequest"/>
<wsdl:output message="tns:RetrievePromotionOfferResponse"/>
<wsdl:fault name="fault" message="tns:FaultMessage"/>
</wsdl:operation>
<wsdl:operation name="customerProductAssignment">
<wsdl:input message="tns:CustomerProductAssignmentRequest"/>
<wsdl:output message="tns:CustomerProductAssignmentResponse"/>
<wsdl:fault name="fault" message="tns:FaultMessage"/>
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="EbsProductOfferOperationsBinding" type="tns:EbsProductOfferOperationsPortType">
<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="retrievePostpaidCommitmentOffer">
<soap:operation soapAction="retrievePostpaidCommitmentOffer"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="fault">
<soap:fault name="fault" use="literal"/>
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="retrievePostpaidFreeUnitOffer">
<soap:operation soapAction="retrievePostpaidFreeUnitOffer"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="fault">
<soap:fault name="fault" use="literal"/>
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="retrievePostpaidServiceOffer">
<soap:operation soapAction="retrievePostpaidServiceOffer"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="fault">
<soap:fault name="fault" use="literal"/>
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="retrievePostpaidTariffOffer">
<soap:operation soapAction="retrievePostpaidTariffOffer"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="fault">
<soap:fault name="fault" use="literal"/>
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="retrievePrepaidBonusOffer">
<soap:operation soapAction="retrievePrepaidBonusOffer"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="fault">
<soap:fault name="fault" use="literal"/>
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="retrievePrepaidServiceOffer">
<soap:operation soapAction="retrievePrepaidServiceOffer"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="fault">
<soap:fault name="fault" use="literal"/>
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="retrievePrepaidTariffOffer">
<soap:operation soapAction="retrievePrepaidTariffOffer"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="fault">
<soap:fault name="fault" use="literal"/>
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="retrievePromotionOffer">
<soap:operation soapAction="retrievePromotionOffer"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="fault">
<soap:fault name="fault" use="literal"/>
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="customerProductAssignment">
<soap:operation soapAction="customerProductAssignment"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="fault">
<soap:fault name="fault" use="literal"/>
</wsdl:fault>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="EbsProductOfferOperations">
<wsdl:port name="EbsProductOfferOperationsPortType" binding="tns:EbsProductOfferOperationsBinding">
<soap:address location="http://localhost:1233/MTSEsb-AveaEsbModel-context-root/EbsProductOfferOperationsPortTypeImplService/EbsProductOfferOperations/EbsProductOfferOperations?wsdl"/>
</wsdl:port>
</wsdl:service>
</wsdl:definitions>
更好的模式/解决方案来选择我的价值？
答案 0 :(得分：1)
您可以手动构建表达式us => us.GoogleEnabled，如下所示：
var argument = Expression.Variable(typeof(UserSettings));
// assuming `provider` is enum with values "Google" etc
var accessor = (Expression<Func<UserSettings, bool>>) Expression.Lambda(
Expression.PropertyOrField(argument, provider.ToString() + "Enabled"), argument);
然后像这样使用它：
var userSettingsTask = seedSession
.Query<UserSettings>()
.Where(us => us.UserId == user.UserId)
.Select(accessor) // < here
.SingleAsync();