EF（实体框架）“using”语句和“try catch”相互配合

Question

Is there any difference between these ways of using/try-catch blocks?

First :

public bool Insert(SomeEntity entity)
{
    bool result = false;
    
    try
    {
        using (var db = new MyEntities())
        {
            db.AddToSomeEntity(entity);
            db.SaveChanges();
            
            result = true;
        }
    }
    catch (Exception e)
    {
        //
    }
    return result;
}

Second :

public bool Insert(SomeEntity entity)
{
    bool result = false;
    using (var db = new MyEntities())
    {
        try
        {
            db.AddToSomeEntity (entity);
            db.SaveChanges();
            result = true;
        }
        catch (Exception e)
        {
                    //
        }
    }
    
    return result;
}

Does it affect performance?

This string was added in order to satisfy SO submit validation rule.

Answer 1

我不认为它违反了任何规则，即你想在什么时候将上下文发送到垃圾收集我建议使用第二种方法，因为它更具体，当你的函数完全执行时，你会将对象发送到垃圾收集，否则您可能会遇到一个异常，即您尝试使用不再可用的上下文