How to split a Chinese string by character?

Question

I have a string containing mostly chinese characters, like so:

string sentence = "我想找到从夏洛特飞往拉斯维加斯，让站在圣路易斯";

How can I split the sentence by character? Ultimately, I want to be able to take my string, and write it to a file with each character being on its own line, like so:

我
想
找
到
从
夏
洛
特
飞
往
拉
斯
维
加
斯
，
让
站
在
圣
路
易
斯

I tried doing this:

StringBuilder s = new StringBuilder();
foreach (char character in sentence.ToCharArray())
{
    s.Append(character + '\n');
}
string output = s.ToString();

StreamWriter writer = new StreamWriter("test.txt", false, Encoding.UTF8);
writer.Write(output);
writer.Close();

...but for whatever reason, instead of writing chinese characters, it writes

   29252242105020184228092794129315391442445825299260413251021162260416530235763314592232222317363452614126041

...to the file instead. However, doing

StreamWriter writer = new StreamWriter("text.txt", false, Encoding.UTF8);
writer.Write(sentence);
writer.Close();

...does successfully write the Chinese sentence to the file, so I do know it shouldn't be a problem with how I'm writing to the file.

Answer 1

I think the problem may be that (character + '\\n'); is being interpreted as an integer. Perhaps trying adding a cast to that line or making two seperate appends like so:

s.Append(character);
s.Append('\n');

Answer 2

        var sentence = "我想找到从夏洛特飞往拉斯维加斯，让站在圣路易斯";
        var chars = sentence.ToCharArray();

        using (var writer = new StreamWriter("test.txt", false, Encoding.UTF8))
        {
            foreach (var c in chars)
            {
                writer.WriteLine(c);
            }

            writer.Close();
        }

Works fine for me