s.Substring(0,s.Length - 1)这里的s.Length - 1有什么作用string s = comboBox2.Text + '/' + listView3.SelectedItems[0].Text;string m = s.Substring(0,s.Length - 1);comboBox2.Text = m;listView3.Items.Clear();fangfa(@"ftp://hhhh@219.220.112.130"+m)

s.Substring(0,s.Length - 1)这里的s.Length - 1有什么作用string s = comboBox2.Text + '/' + listView3.SelectedItems[0].Text;string m = s.Substring(0,s.Length - 1);comboBox2.Text = m;listView3.Items.Clear();fangfa(@"ftp://hhhh@219.220.112.130"+m)
s.Substring(0,s.Length - 1)这里的s.Length - 1有什么作用
string s = comboBox2.Text + '/' + listView3.SelectedItems[0].Text;
string m = s.Substring(0,s.Length - 1);
comboBox2.Text = m;
listView3.Items.Clear();
fangfa(@"ftp://hhhh@219.220.112.130"+m);

s.Substring(0,s.Length - 1)这里的s.Length - 1有什么作用string s = comboBox2.Text + '/' + listView3.SelectedItems[0].Text;string m = s.Substring(0,s.Length - 1);comboBox2.Text = m;listView3.Items.Clear();fangfa(@"ftp://hhhh@219.220.112.130"+m)
s.Length 是s字符串变量的长度,-1的意思的截取到倒数二数,整个意思就是截取s字符串“得到”最后一个字符 .
至于前面的那个0就是从第一个开始截取,一般索引是从0开始的.