如何将 int[] 连接到 .NET 中的字符分隔字符串? [英] How can I join int[] to a character-separated string in .NET?

问题描述

我有一个整数数组:

int[] number = new int[] { 2,3,6,7 };

将这些转换为单个字符串的最简单方法是什么，其中数字由字符分隔(例如:"2,3,6,7")?

What is the easiest way of converting these into a single string where the numbers are separated by a character (like: "2,3,6,7")?

我使用的是 C# 和 .NET 3.5.

I'm using C# and .NET 3.5.

推荐答案

var ints = new int[] {1, 2, 3, 4, 5};
var result = string.Join(",", ints.Select(x => x.ToString()).ToArray());
Console.WriteLine(result); // prints "1,2,3,4,5"

从(至少).NET 4.5 开始，

As of (at least) .NET 4.5,

var result = string.Join(",", ints.Select(x => x.ToString()).ToArray());

相当于:

var result = string.Join(",", ints);

我看到一些解决方案宣传 StringBuilder 的使用.有人抱怨 Join 方法应该采用 IEnumerable 参数.

I see several solutions advertise usage of StringBuilder. Someone complains that the Join method should take an IEnumerable argument.

我会让你失望的 :) String.Join 需要一个数组，原因只有一个 - 性能.Join 方法需要知道数据的大小才能有效地预分配必要的内存量.

I'm going to disappoint you :) String.Join requires an array for a single reason - performance. The Join method needs to know the size of the data to effectively preallocate the necessary amount of memory.

这里是String.Join方法内部实现的一部分:

Here is a part of the internal implementation of String.Join method:

// length computed from length of items in input array and length of separator
string str = FastAllocateString(length);
fixed (char* chRef = &str.m_firstChar) // note than we use direct memory access here
{
    UnSafeCharBuffer buffer = new UnSafeCharBuffer(chRef, length);
    buffer.AppendString(value[startIndex]);
    for (int j = startIndex + 1; j <= num2; j++)
    {
        buffer.AppendString(separator);
        buffer.AppendString(value[j]);
    }
}

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