如何在C＃中向字典添加多个值 [英] How to add multiple values to Dictionary in C#

问题描述

如果我不想多次调用 .Add（），向字典添加多个值的最佳方法是什么。
编辑：我想在启动后填写它！

What is the best way to add multiple values to a Dictionary, if i dont want to call ".Add()" multiple times. Edit: I want to fill it after initiation! there are already some values in the Dictionary!

因此，而不是

    myDictionary.Add("a", "b");
    myDictionary.Add("f", "v");
    myDictionary.Add("s", "d");
    myDictionary.Add("r", "m");
    ...

我想做这样的事情

 myDictionary.Add(["a","b"], ["f","v"],["s","d"]);

有办法吗？

推荐答案

您可以为此使用花括号，尽管这仅适用于初始化：

You can use curly braces for that, though this only works for initialization:

var myDictionary = new Dictionary<string, string>
{
    {"a", "b"},
    {"f", "v"},
    {"s", "d"},
    {"r", "m"}
};

这称为集合初始化，适用于任何 ICollection< T> （请参阅链接了解字典或此< a href = http://msdn.microsoft.com/zh-cn/library/bb384062.aspx rel = noreferrer>链接（对于其他任何收集类型））。实际上，它适用于实现 IEnumerable 并包含 Add 方法的任何对象类型：

This is called "collection initialization" and works for any ICollection<T> (see link for dictionaries or this link for any other collection type). In fact, it works for any object type that implements IEnumerable and contains an Add method:

class Foo : IEnumerable
{
    public void Add<T1, T2, T3>(T1 t1, T2 t2, T3 t3) { }
    // ...
}

Foo foo = new Foo
{
    {1, 2, 3},
    {2, 3, 4}
};

基本上，这只是调用 Add -方法反复。初始化后，有几种方法可以执行此操作，其中一种是手动调用 Add 方法：

Basically this is just syntactic sugar for calling the Add-method repeatedly. After initialization there are a few ways to do this, one of them being calling the Add-methods manually:

var myDictionary = new Dictionary<string, string>
    {
        {"a", "b"},
        {"f", "v"}
    };

var anotherDictionary = new Dictionary<string, string>
    {
        {"s", "d"},
        {"r", "m"}
    };

// Merge anotherDictionary into myDictionary, which may throw
// (as usually) on duplicate keys
foreach (var keyValuePair in anotherDictionary)
{
    myDictionary.Add(keyValuePair.Key, keyValuePair.Value);
}

或作为扩展方法：

static class DictionaryExtensions
{
    public static void Add<TKey, TValue>(this IDictionary<TKey, TValue> target, IDictionary<TKey, TValue> source)
    {
        if (source == null) throw new ArgumentNullException("source");
        if (target == null) throw new ArgumentNullException("target");

        foreach (var keyValuePair in source)
        {
            target.Add(keyValuePair.Key, keyValuePair.Value);
        }
    }
}

var myDictionary = new Dictionary<string, string>
    {
        {"a", "b"},
        {"f", "v"}
    };

myDictionary.Add(new Dictionary<string, string>
    {
        {"s", "d"},
        {"r", "m"}
    });

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