在Entity Framework的ValidateEnity方法中使用异步方法

Question

我试图在实体框架6中覆盖EnityFramework的DbContext.ValidateEntity（）方法。

我遇到的问题是我需要在验证逻辑中调用FirstOrDefaultAsync（），但这会导致覆盖问题，因为该方法未标记为异步。这是我到目前为止的代码......

protected override DbEntityValidationResult ValidateEntity ( 
  DbEntityEntry entityEntry, IDictionary<object, object> items) 
{ 
    var result = new DbEntityValidationResult(
        entityEntry, new List<DbValidationError>()); 

    if (entityEntry.Entity is Post && entityEntry.State == EntityState.Added) 
    { 
        Post post = entityEntry.Entity as Post;

        // This line is illegal as the ValidateEntity()
        // method is not asynchronous
        var errors = await ValidatePost(post);

        // error processing here..
    } 

    if (result.ValidationErrors.Count > 0)  
    { 
        return result; 
    } 
    else  
    { 
        return base.ValidateEntity(entityEntry, items); 
    } 
}


public async Task<ICollection<DbValidationError>>
ValidatePost(Post post)
{
   var errors = new List<DbValidationError>();

   Post temp = await this.DbContext.Posts
       .FirstOrDefaultAsync(x => x.Title == entity.Title);

   if ((temp != null) && (temp.Id != entity.Id))
   {
       errors.Add(new DbValidationError(
          "Title", "A Post already exists with the title " + temp.Title
       ));
   }

   return errors;
}

上面显示的实际验证逻辑有些简化，但它证明了问题。

如何从ValidateEntity /非异步方法中调用.FirstOrDefaultsAsync（）或任何实体框架异步方法？