初始化 C# 哈希表的最简洁方法
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Most concise way to initialize a C# hashtable
提问by RexE
Does C# allow hashtables to be populated in one-line expressions? I am thinking of something equivalent to the below Python:
C# 是否允许在单行表达式中填充哈希表？我正在考虑与以下 Python 等效的内容：
mydict = {"a": 23, "b": 45, "c": 67, "d": 89}
In other words, is there an alternative to setting each key-value pair in a separate expression?
换句话说，是否有另一种方法可以在单独的表达式中设置每个键值对？
采纳答案by Andrew Hare
C# 3 has a language extension called collection initializerswhich allow you to initialize the values of a collection in one statement.
C# 3 有一个称为集合初始化器的语言扩展，它允许您在一个语句中初始化集合的值。
Here is an example using a Dictionary<,>:
这是一个使用 a 的示例Dictionary<,>：
using System;
using System.Collections.Generic;
class Program
{
static void Main()
{
var dict = new Dictionary<string, int>
{
{"a", 23}, {"b", 45}, {"c", 67}, {"d", 89}
};
}
}
This language extension is supported by the C# 3 compiler and any type that implements IEnumerableand has a public Addmethod.
C# 3 编译器和任何实现IEnumerable并具有公共Add方法的类型都支持此语言扩展。
If you are interested I would suggest you read this question I asked here on StackOverflowas to whythe C# team implemented this language extension in such a curious manner (once you read the excellent answers to the question you will see that it makes a lot of sense).
如果您有兴趣，我建议您阅读我在 StackOverflow 上问的这个问题，以了解为什么C# 团队以如此奇怪的方式实现了这种语言扩展（一旦您阅读了该问题的出色答案，您就会发现它使很多感觉）。
