C# 将字符串列表转换为单个字符串
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Convert a list of strings to a single string
提问by user2869820
List<string> MyList = (List<string>)Session["MyList"];
MyListcontains values like: 12345523.
MyList包含以下值：12345523。
I tried using the code below, however the values disappear.
我尝试使用下面的代码，但是值消失了。
string Something = Convert.ToString(MyList);
I also need each value to be separated with a comma (",").
我还需要用逗号 (" ,")分隔每个值。
How can I convert List<string> Mylistto string?
我怎样才能转换List<string> Mylist为string？
采纳答案by ProgramFOX
string Something = string.Join(",", MyList);
回答by MUG4N
Try this code:
试试这个代码：
var list = new List<string> {"12", "13", "14"};
var result = string.Join(",", list);
Console.WriteLine(result);
The result is: "12,13,14"
结果是： "12,13,14"
回答by Misha Zaslavsky
You can make an extension method for this, so it will be also more readable:
您可以为此创建一个扩展方法，因此它也将更具可读性：
public static class GenericListExtensions
{
public static string ToString<T>(this IList<T> list)
{
return string.Join(",", list);
}
}
And then you can:
然后你可以：
string Something = MyList.ToString<string>();
回答by Sam
Or, if you're concerned about performance, you could use a loop,
或者，如果您担心性能，可以使用循环，
var myList = new List<string> { "11", "22", "33" };
var myString = "";
var sb = new System.Text.StringBuilder();
foreach (string s in myList)
{
sb.Append(s).Append(",");
}
myString = sb.Remove(sb.Length - 1, 1).ToString(); // Removes last ","
This Benchmarkshows that using the above loop is ~16% faster than String.Join()(averaged over 3 runs).
该基准测试表明，使用上述循环比String.Join()（平均运行 3 次）快约 16% 。
回答by Falgantil
Entirely alternatively you can use LINQ, and do as following:
或者，您可以使用 LINQ，并执行以下操作：
string finalString = collection.Aggregate("", (current, s) => current + (s + ","));
However, for pure readability, I suggest using either the loop version, or the string.Join mechanism.
但是，为了纯粹的可读性，我建议使用循环版本或 string.Join 机制。
回答by modle13
I had to add an extra bit over the accepted answer. Without it, Unity threw this error:
我不得不在接受的答案上多加一点。没有它，Unity 会抛出这个错误：
cannot convert `System.Collections.Generic.List<string>' expression to type `string[]'
The solution was to use .ToArray()
解决方案是使用.ToArray()
List<int> stringNums = new List<string>();
String.Join(",", stringNums.ToArray())
