为什么我收到异常错误indexOutOfRangeException？

user2760148 发表于 Dev

用户名

在Form1构造函数中，我有：

if (System.IO.File.Exists(keywords_path_file))
            {
                ListBoxLoadKeys(LocalyKeyWords, keywords_path_file);
            }
            else
            {
                fileExist = new StreamWriter(keywords_path_file);
                fileExist.Close();
                ListBoxLoadKeys(LocalyKeyWords, keywords_path_file);
            }

我使用一个断点，发现该文件存在：

C:\Users\bout0_000\AppData\Local\GatherLinks\GatherLinks\Keywords\Keywords.txt

文件内容为：

http://www.walla.co.il,walla
http://www.cnet.com,cnet
http://rotter.net/forum/scoops1/29961.shtml,rotter
http://vanessawest.tripod.com/crimescenephotos.html,VanessaWest
http://rotter.net/forum/scoops1/45227.shtml,scoops
https://www.google.com/search?q=live+cameras,live camera
https://www.google.com/search?q=rape+images&oq=+images&aqs=chrome..69i57.1661j0&sourceid=chrome&ie=UTF-8,hi
https://www.google.com/search?q=+images&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=GqotUv2kA4OftAae94DoAg&biw=951&bih=457&sei=oaotUtDqM8WbtAag3IFg#hl=en&q=+and+&tbm=isch&um=1,chud
http://www.test.com,test

该文件包含9个键和关键字。左侧的按键右侧的关键字。

然后进入这种方法：

private void ListBoxLoadKeys(Dictionary<string, List<string>> dictionary, string FileName)
        {
            List<string> urls = new List<string>();
            using (StreamReader sr = new StreamReader(FileName))
            {
                while ((line = sr.ReadLine()) != null)
                {
                    int i = line.Count();
                    tokens = line.Split(',');
                    dictionary.Add(tokens[0], tokens.Skip(1).ToList());
                    data.Add("Url: " + tokens[0] + " --- " + "Localy KeyWord: " + tokens[1]);
                    urls.Add(tokens[0]);
                }
            }
            listBox1.DataSource = data;
            listBox1.Tag = urls;
        }

在方法中，当它出现o时：listBox1.DataSource = data; 它跳跃并执行此事件：

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

            if (listBox1.SelectedItem != null)
            {
                label4.Text = listBox1.SelectedItem.ToString();
                string startTag = "Url: ";
                string endTag = " ---";
                int startTagWidth = startTag.Length;
                int endTagWidth = endTag.Length;
                int index = 0;
                index = label4.Text.IndexOf(startTag, index);
                int start = index + startTagWidth;
                index = label4.Text.IndexOf(endTag, start + 1);
                string g = label4.Text.Substring(start, index - start);
                label4.Text = g;
                mainUrl = g;
            }
        }

最后，我看到data和listBox1.DataSource都包含9个项目。

毕竟，程序正在运行。我在列表框的右边看到项和关键字。一旦我单击listBox1 im中的键之一，就在行上得到了异常：

if (listBox1.SelectedItem != null)

在listBox1_SelectedIndexChanged事件中。

例外是：

指数数组的边界之外

System.IndexOutOfRangeException was unhandled
  HResult=-2146233080
  Message=Index was outside the bounds of the array.
  Source=System.Windows.Forms
  StackTrace:
       at System.Windows.Forms.ListBox.ItemArray.GetItem(Int32 virtualIndex, Int32 stateMask)
       at System.Windows.Forms.ListBox.get_SelectedItem()
       at GatherLinks.Form1.listBox1_SelectedIndexChanged(Object sender, EventArgs e) in d:\C-Sharp\GatherLinks\GatherLinks-2\GatherLinks\GatherLinks\Form1.cs:line 543
       at System.Windows.Forms.ListBox.OnSelectedIndexChanged(EventArgs e)
       at System.Windows.Forms.ListBox.WmReflectCommand(Message& m)
       at System.Windows.Forms.ListBox.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd, Message& m)
       at System.Windows.Forms.Control.WmCommand(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
       at System.Windows.Forms.ContainerControl.WndProc(Message& m)
       at System.Windows.Forms.Form.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
       at System.Windows.Forms.Control.DefWndProc(Message& m)
       at System.Windows.Forms.Control.WmKillFocus(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ListBox.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  InnerException:

我知道异常的含义，但是我正在得到什么，我该如何解决？

例如，如果我在运行该程序时首先移动了箭头，则箭头在列表框的各个键之间上下移动，然后我单击其中一个，没有任何异常。当我运行程序并立即用鼠标单击listBox中的一个键时，首先出现异常。

在它们之间移动然后单击它们中的一个是可以的，但是单击它们中的一个首先是例外。

编辑**

我现在看到在将listBox1_SelectedIndexChanged事件移至istBox1鼠标事件之前，将其按下：

private void listBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (Control.ModifierKeys == Keys.Control || ( Control.ModifierKeys == Keys.Control || e.Button == MouseButtons.Left))
            {
                listBox1.SelectionMode = SelectionMode.MultiExtended;
            }
            else if (e.Button == MouseButtons.Left)
            {
                listBox1.SelectionMode = SelectionMode.One;
            }
        }

做这行：

listBox1.SelectionMode = SelectionMode.MultiExtended;

然后返回到selectedindexchanged事件，并在行上抛出异常：

if (listBox1.SelectedItem != null)

那也是行号：543

拉尔斯科技

您不能这样做：

private void listBox1_MouseDown(object sender, MouseEventArgs e)
{
  if (Control.ModifierKeys == Keys.Control || ( Control.ModifierKeys == Keys.Control || e.Button == MouseButtons.Left))
  {
    listBox1.SelectionMode = SelectionMode.MultiExtended;
  }
  else if (e.Button == MouseButtons.Left)
  {
    listBox1.SelectionMode = SelectionMode.One;
  }
}

我认为在MouseDown事件中更改该属性会破坏该窗口并再次重新创建它，这与在SelectedIndexChanged事件期间触发的内部信息搞混了。

只需注释掉该代码，然后在设计时确定ListBox控件应具有哪个SelectionMode。

您还应该确保获得正确的索引值，例如：

index = label4.Text.IndexOf(endTag, start + 1);
if (index > -1) {
  string g = label4.Text.Substring(start, index - start);
  label4.Text = g;
}

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编辑于2021-02-1

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