c# - 如何获取 InnerException 的详细信息

Question

Regarding the duplicated. I can access the Message property but not the Detail property even when I can see is part of the Exception object during debuging. So the question is Why cant access Detail property.

我发现了一个异常。

catch (Exception ex)
{
    string msg = ex.InnerException.InnerException.Message;
    // say Exception doesnt have Detail property
    // string detail = ex.InnerException.InnerException.Detail; 
    return Json(new { status = "Fail", message = msg, detail: detail });
}

ex 不说话

ex.InnerException 显示相同的信息

ex.InnerException.InnerException. 终于有一些真正的消息，“db table duplicated key”

ex.InnerException.InnerException.Message 我可以收到消息。

但即使只有一个属性 Detail

也无法获取 Detail "the guilty key"

1. 那么我怎样才能得到详细信息呢？
2. 奖励:为什么必须深入 InnerException 两次才能获得一些有意义的消息？

Answer 1

我认为现在最优雅的方法是使用 C# 6 when keyword in a catch statement和 C# 7 is operator .

try
{
    //your code
}
catch (DbUpdateException ex) when (ex.InnerException is PostgresException pex)
{
    string msg = pex.Message;
    string detail = pex.Detail; 
    return Json(new { status = "Fail", message = msg, detail: detail });
}