处理KeyNotFoundException的最佳方式 [英] Best way to handle a KeyNotFoundException

问题描述

我正在使用字典来执行我正在处理的程序的查找。我通过字典运行一堆键，我希望一些键不具有值。我抓住了 KeyNotFoundException 发生，并吸收它。所有其他异常将传播到顶部。这是最好的办法吗？还是应该使用不同的查找？该字典使用int作为其键，并将自定义类作为其值。

I am using a dictionary to perform lookups for a program I am working on. I run a bunch of keys through the dictionary, and I expect some keys to not have a value. I catch the KeyNotFoundException right where it occurs, and absorb it. All other exceptions will propagate to the top. Is this the best way to handle this? Or should I use a different lookup? The dictionary uses an int as its key, and a custom class as its value.

推荐答案

使用 Dictionary.TryGetValue ：

Dictionary<int,string> dictionary = new Dictionary<int,string>();
int key = 0;
dictionary[key] = "Yes";

string value;
if (dictionary.TryGetValue(key, out value))
{
    Console.WriteLine("Fetched value: {0}", value);
}
else
{
    Console.WriteLine("No such key: {0}", key);
}

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