错误：WCF 中，在SVC中使用实体查询库时报错：“基础提供程序在Open上失败了”
说明：操作系统Win8；WCF发布到IIS中；数据库使用VS2012自带的localDB.
一，这是接口定义
[ServiceContract]
public interface INeed
{
[OperationContract]
[WebInvoke(
Method = "POST",
RequestFormat = WebMessageFormat.Json,
ResponseFormat = WebMessageFormat.Json,
UriTemplate = "/uploadMdNeed",
BodyStyle = WebMessageBodyStyle.Bare
)]
String uploadMdNeed(MdNeed mdNeed);
}
二，这是接口实现
public class Need:INeed
{
public string uploadMdNeed(MdNeed mdNeed)
{
try
{
lmEntities lmEtt = new lmEntities();
NeedTb need = new NeedTb();
need.SDescribe = "描述描述";
lmEtt.NeedTb.Add(need);
lmEtt.SaveChanges();
return "使用lmEitities类实例，实现新记录的添加。结果是：成功！";
}
catch (Exception e)
{
return "操作结果是：失败了！！！" + e.Message ;
}
}
}
三，web.config内容
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<appSettings>
<add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
</appSettings>
<system.web>
<compilation debug="true" targetFramework="4.5">
<assemblies>
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
</assemblies>
</compilation>
<httpRuntime targetFramework="4.5" />
</system.web>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="">
<serviceMetadata httpGetUrl="" httpGetEnabled="true" />
<serviceDebug httpHelpPageEnabled="true" includeExceptionDetailInFaults="true" />
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="httpBehavior">
<webHttp />
</behavior>
</endpointBehaviors>
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
<services>
<service name="MyHost.Need_.Need">
<endpoint address="" binding="webHttpBinding" contract="MyHost.Need_.INeed" behaviorConfiguration="httpBehavior" />