索引超出数组范围

Question

        private void MaskIpAddr(System.Windows.Forms.TextBox textBox, KeyPressEventArgs e)
        {
            int len = textBox.Text.Length;
            if (Char.IsDigit(e.KeyChar) || e.KeyChar == '.' || e.KeyChar == 8)
            {
                if (e.KeyChar != 8)
                {
                    if (len == 2 && e.KeyChar != '.')
                    {
                        string tmp = textBox.Text + e.KeyChar;
                        if (textBox.Name == "textBox1")
                        {
                            if (Int32.Parse(tmp) > 223) // 进行验证
                            {
                                MessageBox.Show(tmp + " 不是一个有效项目。请指定一个介于 1 和 223 之间的数值。");
                                textBox.Text = "223";
                                textBox.Focus();
                                return;
                            }
                            textBox2.Focus();
                            textBox2.SelectAll();                        }
                        else if (textBox.Name == "textBox2")
                        {
                            if (Int32.Parse(tmp) > 255)
                            {
                                MessageBox.Show(tmp + " 不是一个有效项目。请指定一个介于 1 和 255 之间的数值。");
                                textBox.Text = "255";
                                textBox.Focus();
                                return;
                            }
                            textBox3.Focus();
                            textBox3.SelectAll();
                        }
                        else if (textBox.Name == "textBox3")
                        {
                            if (Int32.Parse(tmp) > 255)
                            {
                                MessageBox.Show(tmp + " 不是一个有效项目。请指定一个介于 1 和 255 之间的数值。");
                                textBox.Text = "255";
                                textBox.Focus();
                                return;
                            }
                            textBox4.Focus();
                            textBox4.SelectAll();
                        }
                        else if (textBox.Name == "textBox4")
                        {
                            if (Int32.Parse(tmp) > 255)
                            {
                                MessageBox.Show(tmp + " 不是一个有效项目。请指定一个介于 1 和 255 之间的数值。");
                                textBox.Text = "255";
                                textBox.Focus();
                                return;
                            }                        }                    }
                    if (e.KeyChar == '.')
                    {
                        if (textBox.Name == "textBox1" && textBox.Text != "")
                        {
                            textBox2.Focus();
                            textBox2.SelectAll();
                        }
                        if (textBox.Name == "textBox2" && textBox.Text != "")
                        {
                            textBox3.Focus();
                            textBox3.SelectAll();
                        }
                        if (textBox.Name == "textBox3" && textBox.Text != "")
                        {
                            textBox4.Focus();
                            textBox4.SelectAll();
                        }
                        if (textBox.Name == "textBox4" && textBox.Text != "")
                        {                        }
                        e.Handled = true;
                    }
                }
                else
                {
                    if (textBox.Name == "textBox1" && textBox.Text == "")
                    {                    }
                    if (textBox.Name == "textBox2" && textBox.Text == "")
                    {
                        textBox1.Focus();
                        textBox1.SelectionStart = textBox1.Text.Length;
                    }
                    if (textBox.Name == "textBox3" && textBox.Text == "")
                    {
                        textBox2.Focus();
                        textBox2.SelectionStart = textBox2.Text.Length;
                    }
                    if (textBox.Name == "textBox4" && textBox.Text == "")
                    {
                        textBox3.Focus();
                        textBox3.SelectionStart = textBox3.Text.Length;
                    }
                    e.Handled = false;
                }
            }
            else
                e.Handled = true;
        }        [Browsable(true)]
        /// <summary>
        /// 获取 IpBox 的文本。
        /// </summary>
        public new string Text
        {
            get
            {
                if (textBox1.Text == ""
                 || textBox2.Text == ""
                 || textBox3.Text == ""
                 || textBox4.Text == "")
                {
                    text ="";
                    return text;
                }
                else
                {
                    text = Convert.ToInt32(textBox1.Text).ToString() + "." + Convert.ToInt32(textBox2.Text).ToString() + "." + Convert.ToInt32(textBox3.Text).ToString() + "." + Convert.ToInt32(textBox4.Text).ToString();
                    return text;
                }            }
            set
            {
                String[] elems=new string[4];
                elems = value.Split('.');
                textBox1.Text = elems[0];
                textBox2.Text = elems[1];///[color=#339966]每次运行到这个位置，都会提示索引超出数组界限                textBox3.Text = elems[2];
                textBox4.Text = elems[3];
                textBox4.Focus();
            }
                    }
    }
}在线等，谢谢了各位[/color]

Answer 1

elems只有一个元素吧？ F10调试之   结贴

Answer 2

判断elems.Length
单步跟踪值

Answer 3

这是一个输入ip的控件，elems是一个输入的ip地址，通过“.”分割获得每一位ip

Answer 4

 String[] elems=new string[4];
  elems = value.Split('.');
改为
string elems = value.Split('.');
这样就不会啦！~
要取数据跟数组一样！~

Answer 5

string[] elems = value.Split('.');

Answer 6

关键是开始限制了数组的长度,直接获取string[]数组就可以了。

Answer 7

 set
  {
  String[] elems=new string[4];
  elems = value.Split('.');
  if(elems.Count<4)
  {
    MessageBox.Show("IP:"+value.ToString()+" IP不正确或 value.Split()分组不正确,请检查");
  }
  textBox1.Text = elems[0];
  textBox2.Text = elems[1];///[color=#339966]每次运行到这个位置，都会提示索引超出数组界限 textBox3.Text = elems[2];
  textBox4.Text = elems[3];
  textBox4.Focus();
  }试试?会不会提示错