Question

C # WINFORM问题

文本框左右各有一个按钮，单击左侧按钮则文本框中文字向左循环滚动一次，单击右侧按钮则文本框中文字向右循环滚动一次
求代码：
private void button1_Click(object sender, EventArgs e)
{
string str = textBox1.Text;
char frist = str[0];
string end = str.Substring(1);
textBox1.Text = end + frist;
}

private void button2_Click(object sender, EventArgs e)
{
string str2 = textBox1.Text;
string frist2 = str2.Substring(0, str2.Length - 1);
char end2 = str2[str2.Length];//我的这句有什么问题 求正确的代码
textBox1.Text = end2 + frist2;
谢谢各位拉

Answer 1

private void button1_Click(object sender, EventArgs e)
{
string str = textBox1.Text.Trim();

if (string.IsNullOrEmpty(str)) return;
if (str.Length == 1) return;

char first = str[0];
string end = str.Substring(1);
textBox1.Text = end + first;
}

private void button2_Click(object sender, EventArgs e)
{
string str = textBox1.Text.Trim();
if (string.IsNullOrEmpty(str)) return;
if (str.Length == 1) return;

string first = str.Substring(0, str.Length - 1);
char end = str[str.Length - 1];
textBox1.Text = end + first;
}

Answer 2

char end2=str2[str2.length-1];
length-1啊，，楼主忘了吧