c# - 重构以删除 try/catch

Question

有什么好的方法可以重构它，使我的代码行为相同，但不需要抛出和捕获我自己的异常吗？

public Int32 ChooseNextColor(Int32 numColors)
{
    int? nextColor = null;

    while (nextColor == null)
    {
        Console.Write("Please enter your next color selection: ");
        string input = Console.ReadLine();

        try
        {
            nextColor = Convert.ToInt32(input);
            if (nextColor > numColors || nextColor < 0) 
                throw new ArgumentOutOfRangeException();
        }
        catch
        {
            nextColor = null;
            Console.WriteLine("Unrecognized input: " + input);
            Console.WriteLine("Please enter a value between 0 and " + numColors + ".");
        }
    }

    return (nextColor.Value);
}

编辑:try/parse 方法正是我要找的。

作为对 John 标题编辑的回应 -> 我本应该发布更多信息作为开始，那就是“一起摆脱 try/catch 是最好的”。因此，考虑到这一点，我更改了标题。

Answer 1

尝试

int nextColor;
input = Console.ReadLine();

while( ! Int32.TryParse( input, out nextColor ) 
       || nextColor > numColors 
       || nextColor < 0 )
{ 
    Console.WriteLine("Unrecognized input: " + input);
    Console.WriteLine("Please enter a value between 0 and " + numColors + ".");
    input = Console.ReadLine();
}