抛出异常的两种方法如何区分它们

Question

我有一个 try catch 块，它包含两个可以抛出 ArgumentException 的方法。

我想区分异常，以便我可以 return 为用户提供更好的错误消息。最好的方法是什么？（我想避免用两个单独的 try catch 块包围它）。

try
{
    var store = storeFactory.Create(id); // Can Throw ArgumentException
    var order = await store.GetOrderAsync(orderId); //Can Throw ArgumentException

    return Ok(order);
}
catch (ArgumentException ex)
{
    //TODO: How To Tell Which Methods Throw The Exception (Create Or GetOrderAsync)
    return NotFound("Store Id Was Not Found");
    return NotFound("Order Id Was Not Found");
}

Answer 1

您可以简单地将 try 块分成两个 try 块：

try
{
    var store = storeFactory.Create(id); // Can Throw ArgumentException
    try
    {
       var order = await store.GetOrderAsync(orderId); //Can Throw ArgumentException

       return Ok(order);
    }
    catch ( ArgumentException ex )
    {
       return NotFound("Order Id Was Not Found");
    }
}
catch (ArgumentException ex)
{
    //TODO: How To Tell Which Methods Throw The Exception (Create Or GetOrderAsync)
    return NotFound("Store Id Was Not Found");
}

然而，更好的解决方案是为这两种情况创建一种新的异常类型，例如：

public class OrderNotFoundException : Exception

和

public class StoreNotFoundException : Exception

然后修改您的方法以抛出这些描述性错误。

抛出异常的两种方法如何区分它们

Two Methods That Throws Exceptions How To Differentiate between them

c#

exception-handling