在C#中水平附加字符串 [英] appending string horizontally in c#

问题描述

我是C#的新手，正在此程序中尝试演示程序，我的预期输出是:

I am new to C# and trying a demo program in this program my intended output is:

Id     1 2 3 4 5 6 7 8 9
Roll # 1 2 3 4 5 6 7 8 9

这就是我尝试过的:

static void Main(string[] args)
{
    StringBuilder sb = new StringBuilder();
    sb.Append("Id ");
    for (int i = 0; i < 10; i++)
    {
        sb.Append(i+" ");
    }
    sb.AppendLine();
    sb.Append("Roll# ");
    for (int i = 0; i < 10; i++)
    {
        sb.Append(i + " ");
    }
    Console.WriteLine(sb);
}

尽管它给了我想要的输出，但是在这里我必须遍历两次for循环.有什么方法可以使用某种C#字符串格式仅迭代一次就可以得到相同的输出?

though it gives me desired output but here I have to iterate through for loop twice. Is there any way by which only iterating once I can get the same output, using some string formatting of C#?

推荐答案

使用，以及字符串.Join()将先前创建的范围与字符串" :

This can be done without explicit looping, using Enumerable.Range to "generate a sequence of integral numbers within a specified range", along with string.Join() to concatenate the previously created range with the string " " :

// using System.Linq;

string range = string.Join(" ", Enumerable.Range(1, 10)); // "1 2 3 4 5 6 7 8 9 10"
sb.AppendLine($"Id {range}");
sb.AppendLine($"Roll# {range}");

---

如果您真的想使用 for 循环来构建序列，则可以构建自己的 Range 方法，例如:

---

If you really want to use a for loop to build your sequence, you can build your own Range method such as :

public static IEnumerable<int> Range(int min, int max)
{
    if (min > max)
    {
        throw new ArgumentException("The min value can't be greater than the max");
    }
    for (int i = min; i <= max; i++)
    {
        yield return i;
    }
}

然后像以前一样加入:

var range = string.Join(" ", Range(1, 10));
sb.AppendLine($"Id {range}");
sb.AppendLine($"Roll# {range}");

---

或构建一个数组/列表/任何集合，然后使用 string.Join():

var arr = new int [10];
for (int i = 1; i <= 10; i++)
{
    arr[i - 1] = i;
}

string range = string.Join(" ", arr);
sb.AppendLine($"Id {range}");
sb.AppendLine($"Roll# {range}");

---

或者直接在循环中构建一个字符串:

---

Or directly build a string in the loop :

var sbRange = new StringBuilder();
for (int i = 1; i <= 10; i++)
{
    sbRange.Append($"{i} ");
}
// You can use a string and trim it (there is a space in excess at the end)
string range = sbRange.ToString().Trim();

sb.AppendLine($"Id {range}");
sb.AppendLine($"Roll# {range}");

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