带返回类型的try-catch块 [英] try-catch blocks with the return type

问题描述

如果我有一个返回值的方法，例如

If I have a method that returns something, like

public DataTable ReturnSomething()
{
   try
   {  
      //logic here
     return ds.Tables[0];
   }
   catch (Exception e)
   {
      ErrorString=e.Message;
   }
}

这会产生编译器错误，显然是因为 catch {} 块不返回任何内容。

This produces compiler error, obviously because catch{} block does not return anything.

因此，当我有带有返回值的方法时，我不使用try-catch块，这是一个不好的做法。如果有错误，我想将错误字符串设置为该错误。但是然后我也需要一个返回值。忠告？

So when I have methods with return values I don't use try-catch block, which is a bad practice. If there is an error, I would like to set error string to that error. But then I need a return value as well. Advice?

推荐答案

将返回值存储在这样的临时变量中：

Store your return value in a temporary variable like this:

public DataTable ReturnSomething()
{
    DataTable returnValue = null;

    try
    {
        //logic here
        returnValue = ds.Tables[0]; 
    }
    catch (Exception e)
    {
        ErrorString=e.Message;
    }

    return returnValue;
}

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