在 Key => Value 中合并两个数组

Question

我有两个长度相同的数组，我需要将第一个用作Key，将第二个用作Value。

我的Key 是唯一的string，而我的Value 是双精度。 我有 6 只水豚。他们的名字是关键，他们的重量是磅。

我当前的代码：

        ViewBag.MeuBalaioDeCapivaras = new string[]
        {
            "Jerimúndia",
            "Genoveva",
            "Facibulana",
            "Carnavala",
            "Dentinhos Dourados",
            "Creusa"
        };

        ViewBag.PesoDeCadaCapivaraDoMeuBalaioDeCapivaras = new double[]
        {
            500.0,
            400.0,
            250.0,
            12.0,
            1589.0,
            87.3
        };

这是我的数组，我是 KeyValuePair:

var keyValuePair = new KeyValuePair<string, double>(ViewBag.NomeDaCapivara, ViewBag.PesoDeCadaCapivaraDoMeuBalaioDeCapivaras);

它编译完美，但最后它在运行时给了我一个异常：

=> An exception of type 'Microsoft.CSharp.RuntimeBinder.RuntimeBinderException' occurred in System.Core.dll but was not handled in user code. Additional information: The best correspondence of the overloaded method.

我该怎么做？

Answer 1

LINQ 有一个鲜为人知的功能可以做到这一点 - Zip。该函数接受两个集合并将它们合并为一个集合：

int[] numbers = { 1, 2, 3, 4 };
string[] words = { "one", "two", "three" };

var numbersAndWords = numbers.Zip(words, (number, word) => new KeyValuePair<string,int>(word, number);

Answer 2

您的代码可以编译，因为ViewBag 是dynamic，这意味着没有编译时检查。

如果你更换了

var keyValuePair = new KeyValuePair<string, double>(ViewBag.NomeDaCapivara, ViewBag.PesoDeCadaCapivaraDoMeuBalaioDeCapivaras);

如果你直接把数组放进去，你会得到你所期望的编译时错误：例如

var keyValuePair = new KeyValuePair<string, double>(
    new string[] { "Jerimúndia", "Genoveva", "Facibulana", "Carnavala", "Dentinhos Dourados", "Creusa" },
new double[] { 500.0, 400.0, 250.0, 12.0, 1589.0, 87.3 });

给予：

Compilation error (line x1, col y1): The best overloaded method match for 'System.Collections.Generic.KeyValuePair<string,double>.KeyValuePair(string, double)' has some invalid arguments
Compilation error (line x2, col y2): Argument 1: cannot convert from 'string[]' to 'string'
Compilation error (line x3, col y3): Argument 2: cannot convert from 'double[]' to 'double'

老派的、明确的做法是这样的：

    var meuBalaioDeCapivaras = new string[]
    {
    "Jerimúndia", "Genoveva", "Facibulana", "Carnavala", "Dentinhos Dourados", "Creusa"
    };

    var pesoDeCadaCapivaraDoMeuBalaioDeCapivaras = new double[]
    {
    500.0, 400.0, 250.0, 12.0, 1589.0, 87.3
    };

    var list = new List<KeyValuePair<string, double>>();

    for (var i = 0; i < meuBalaioDeCapivaras.Length; i++)
    {
        list.Add(new KeyValuePair<string, double>(meuBalaioDeCapivaras[i], pesoDeCadaCapivaraDoMeuBalaioDeCapivaras[i]));
    }

正如Felipe Oriani 和Avner Shahar-Kashtan 所说，如果您使用.NET 3.5 或更高版本，则可以使用Linq