These characters show fine when I cut-and-paste them here from the VisualStudio debugger, but both in the debugger, and in the TextBox where I am trying to display this text, it just shows squares.
说明\r\n海流受季风影响，3-9 月份其流向主要向北，流速为2 节，有时达3 节；10 月至次年4 月份其流向南至东南方向，流速为2 节。\r\n注意\r\n附近有火山爆发的危险，航行时严加注意\r\n
I thought that the TextBox supported Unicode text. Any idea how I can get this text to display in my application?
You need to install and use a font which supports those characters. Not all fonts support all characters. the [] box character is the fonts representation of 'unsupported'
The textbox might be using MS Sans Serif by default, so change it to Arial or something else.
I changed from using a TextBox to using a RichTextBox, and now the characters display in the RichTextBox.
I was facing similar problem.
It was problem with reading file properly and not with TextBox control.
StreamReader reader = new StreamReader(inputFilePath, Encoding.Default, true)
Copied from THIS.
Works for me and that too without switching to RichTextBox.
Did you add Application.SetCompatibleTextRenderingDefault(false); to your main.cs file? If not, the unicode characters won't show.
Microsoft Sans-Serif does support unicode characters to my knowledge. Check that you have these lines of code in your main.cs file:
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);