C#二维数组使用for循环输出州与首府同换行问题求助

你的问题出在**Console.WriteLine会自动添加换行符**，而且内层循环遍历每个元素都调用它，导致州和首府各自单独占一行。以下是两种简单的修正方案：

方案一：直接访问每行的两个元素（最简洁） #

因为你的数组固定每行存储「州+首府」两个元素，完全可以去掉内层循环，直接拼接两个值后整行输出：

string[,] places =
{ 
    {"Connecticut", "Hartford"},
    {"Delaware", "Dover"},
    {"Kentucky", "Frankfort"},
    {"Maryland", "Annapolis"},
    {"Massachusetts", "Boston"},
    {"Michigan", "Lansing"},
    {"New Hampshire", "Concord"},
    {"New Jersey", "Trenton"},
    {"New York", "Albany"},
    {"North Carolina", "Raleigh"},
    {"Pennsylvania", "Harrisburg"},
    {"Rhode Island", "Providence"},
    {"South Carolina", "Columbia"},
    {"Tennessee", "Nashville"},
    {"Virginia", "Richmond"},
    {"West Virginia", "Charleston"} 
};

for (int i = 0; i < places.GetLength(0); i++)
{
    // 字符串插值拼接州和首府，一次性输出整行
    Console.WriteLine($"{places[i, 0]} {places[i, 1]}");
}

方案二：保留内层循环，改用Console.Write控制换行 #

如果需要保留内层循环（比如适配每行元素数量不固定的场景），可以用Console.Write输出元素（不自动换行），每行遍历结束后手动换行：

string[,] places =
{ 
    {"Connecticut", "Hartford"},
    {"Delaware", "Dover"},
    {"Kentucky", "Frankfort"},
    {"Maryland", "Annapolis"},
    {"Massachusetts", "Boston"},
    {"Michigan", "Lansing"},
    {"New Hampshire", "Concord"},
    {"New Jersey", "Trenton"},
    {"New York", "Albany"},
    {"North Carolina", "Raleigh"},
    {"Pennsylvania", "Harrisburg"},
    {"Rhode Island", "Providence"},
    {"South Carolina", "Columbia"},
    {"Tennessee", "Nashville"},
    {"Virginia", "Richmond"},
    {"West Virginia", "Charleston"} 
};

for (int i = 0; i < places.GetLength(0); i++)
{
    for (int j = 0; j < places.GetLength(1); j++)
    {
        Console.Write(places[i,j]);
        // 仅在非最后一个元素后添加空格
        if (j != places.GetLength(1) - 1)
        {
            Console.Write(" ");
        }
    }
    // 每行元素输出完成后换行
    Console.WriteLine();
}

内容的提问来源于stack exchange，提问作者Jazmin T