小编Naw*_*.io的帖子

TimeSpan time24 = new TimeSpan(24, 0, 0);
TimeSpan time18 = new TimeSpan(18, 0, 0);    

// first get today's sleeping hours
List<Model.Sleep> sleeps = context.Sleeps.Where(
    o => (clientDateTime - o.ClientDateTimeStamp < time24) && 
          o.ClientDateTimeStamp.TimeOfDay > time18 && 
          clientDateTime.TimeOfDay < time18 && 
          o.UserID == userid).ToList(); 

此Linq表达式抛出此异常:

DbArithmeticExpression arguments must have a numeric common type.

请帮忙!

这是我在Windows Azure Services Project上的Web.config

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <configSections>
  </configSections>
  <!--  To collect diagnostic traces, uncomment the section below or merge with existing system.diagnostics section.
        To persist the traces to storage, update the DiagnosticsConnectionString setting with your storage credentials.
        To avoid performance degradation, remember to disable tracing on production deployments.
  <system.diagnostics>     
    <sharedListeners>
      <add name="AzureLocalStorage" type="NutriLeaf.Services.AzureLocalStorageTraceListener, NutriLeaf.Services"/>
    </sharedListeners>
    <sources>
      <source name="System.ServiceModel" switchValue="Verbose, ActivityTracing">
        <listeners>
          <add name="AzureLocalStorage"/>
        </listeners>
      </source>
      <source name="System.ServiceModel.MessageLogging" switchValue="Verbose">
        <listeners>
          <add name="AzureLocalStorage"/>
        </listeners>
      </source>
    </sources> 
   </system.diagnostics> -->

  <system.diagnostics>
    <trace> …