处理一个KeyNotFoundException的最佳方式 [英] Best way to handle a KeyNotFoundException

问题描述

我使用的字典执行查找一个程序我工作。我在字典上运行一串钥匙，我希望某些键没有值。我赶上 KeyNotFoundException 右的地方出现，并吸​​收它。所有其他异常将传播到顶部。这是处理最好的方法？或者我应该使用不同的查找？该字典使用一个int作为它的键，和自定义类作为其值

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

使用的 Dictionary.TryGetValue 来代替：

Use Dictionary.TryGetValue instead:

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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