另一种变化是:

Another variation is:

textBox1.text = player.ToString();

此版本中的一个细微差别是您可以定义数字显示的格式.例如，您可以将格式定义为:

A slight difference in this version is that you can define the format for the number presentation. For example, you can define the format as:

textBox1.text = player.ToString("#00");

而数字4的结果将是"04".

详细信息: Int32.ToString方法 [

And the result with number 4 would be "04".

More info: Int32.ToString Method [^]

您直接将整数值分配给string.
除非您在分配之前将其强制类型转换为string ，否则它将无法正常工作.

尝试textBox1.text = Convert.ToString(player);

You are directly assigning an integer value to a string.
This won''t work until you type cast it into a string before assignment.

Try textBox1.text = Convert.ToString(player);