Question

我有一个字符串列表

new List<string> { "One", "Two", "Three", "Four", "Five", "Six" }

我想要一个包含完整内容的字符串（包括双引号）

"One", "Two", "Three", "Four", "Five", "Six"

因为会写一个文本文件，它将是一个数组[] = {my_string}

我尝试了这个没有成功

var joinedNames = fields.Aggregate((a, b) => "\"" + a + ", " + b + "\"");

小LINQ帮助将非常感激：）

Answer 1

var joinedNames = "\"" + string.Join("\", \"", fields) + "\"";

Answer 2

您可以使用Linq和string.Join

轻松完成

var joinedNames = string.Join(", ", fields.Select(f => "\"" + f + "\""));

Answer 3

var list = new List<string> { "One", "Two", "Three", "Four", "Five", "Six" };
joinedNames = "\"" + string.Join("\", \"", list) + "\"";

Answer 4

使用string.Join：

var myList = new List<string> { "One", "Two", "Three", "Four", "Five", "Six" };
var joined = string.Join(", ", myList.Select(item => "\"" + item + "\""));

Answer 5

List<string>只是IEnumerable接口的一个实现，它本身就是一个包装器，并继承了string[]的方法，其中有一个string.join(...)方法，这就是你实际上想做。

我使用原始数据运行了测试，但是我在集合中添加了 null 。所有4个版本的数据（列表，数组和每个版本的IEnumerable）都按预期执行了连接方法，最后得到了完全相同的字符串。

    List<string> list = new List<string> { "One", "Two", "Three", null, "Four", "Five", "Six" };
    string JoinedList = "\"" + string.Join("\", \"", list) + "\"";

    string[] array = new string[] { "One", "Two", "Three", null, "Four", "Five", "Six" };
    string JoinedArray = "\"" + string.Join("\", \"", array) + "\"";

    IEnumerable<string> ieList = new List<string> { "One", "Two", "Three", null, "Four", "Five", "Six" };
    string ieListString = "\"" + string.Join("\", \"", ieList) + "\"";


    IEnumerable<string> ieArray = new string[] { "One", "Two", "Three", null, "Four", "Five", "Six" };
    string ieArrayString = "\"" + string.Join("\", \"", ieArray) + "\"";

    Console.WriteLine("Joined List    : " + JoinedList);
    Console.WriteLine("Joined Array    : " + JoinedArray);
    Console.WriteLine("Joined ieList    : " + ieListString);
    Console.WriteLine("Joined ieArray    : " + ieArrayString);

    // results in
    //    Joined List     : "One", "Two", "Three", "", "Four", "Five", "Six"
    //    Joined Array    : "One", "Two", "Three", "", "Four", "Five", "Six"
    //    Joined ieList   : "One", "Two", "Three", "", "Four", "Five", "Six"
    //    Joined ieArray  : "One", "Two", "Three", "", "Four", "Five", "Six"

在您提供的上下文中，任何数据对象都没有优势也没有劣势。如果我们正在寻找性能（无论多么微不足道），我们希望保持字符串[]，但如果我们需要最大功能，我们需要使用List。 IEnumerable确实有一些添加的方法（例如Order）但没有Remove函数（以捕获我插入的空值）

c＃join string逗号分隔，但双引号内的所有值

5 个答案: