有谁知道在这种情况下我如何使用AND？
at System.Data.Entity.QueryableExtensions.FirstOrDefaultAsyncTSource
at System.Data.Entity.QueryableExtensions.FirstOrDefaultAsyncTSource
at PostAnything.Business.Implementation.UsersService.d__2.MoveNext() in C:\TFS\PostAnything\PostAnything.Business\Implementation\UsersService.cs:line 28
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at PostAnything.Business.Tests.UsersServiceTests.d__5.MoveNext() in C:\TFS\PostAnything\PostAnything.Business.Tests\UsersServiceTests.cs:line 49
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
Result Message:
Test method PostAnything.Business.Tests.UsersServiceTests.GetAsync_WithUser_ReturnsOk threw exception:
System.InvalidOperationException: The provider for the source IQueryable doesn't implement IDbAsyncQueryProvider. Only providers that implement IDbAsyncQueryProvider can be used for Entity Framework asynchronous operations. For more details see http://go.microsoft.com/fwlink/?LinkId=287068.
感谢。
答案 0 :(得分：0)
$selected="SELECT * FROM Table WHERE t2 = '".$value1."' AND t1 <> '".$value1."' AND t1 <> '".$value3."'";
只是提供空间。
或者您可以使用NOT IN
$selected="SELECT * FROM Table WHERE t2 = '".$value1."' AND t1 not in ('".$value1."','".$value3."')";