使用Shift +滚轮的横向滚动相当普遍。

The use of shift + scroll wheel is fairly common for horizontal scrolling.

。这都是很容易捕捉。我可以使用鼠标滚轮事件标志由在KeyDown，的KeyUp事件设置跟踪时Shift键是pressed的。

Both of those are fairly easy to capture. I can use the MouseWheel event with a flag set by the KeyDown, KeyUp events to keep track of when the shift key is pressed.

不过，我怎么居然触发水平滚动？我知道WM_MOUSEHWHEEL的，可以是用来触发事件？

However, how do I actually trigger the horizontal scrolling? I am aware of WM_MOUSEHWHEEL, can that be used to trigger the event?

更新： 对于 System.Windows.Form 有一个 Horizo​​ntalScroll 属性，它是类型的 HScrollProperties 。你可以操纵这些对象的值属性来更改水平滚动条的位置。然而，到目前为止，我还没有发现任何其他控件上的对象是可用的。

Update: For a System.Windows.Form there is a HorizontalScroll property that is of type HScrollProperties. You can manipulate the Value attribute on that object to change the horizontal scrollbar's position. However, so far I haven't spotted any other controls on which that object is available.

推荐答案

在你的设计师文件，你需要手动添加鼠标滚轮事件委托。

In your designer file, you'll need to manually add a MouseWheel event delegate.

this.richTextBox.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.RichTextBox_MouseWheel);

然后，在你的背后code，你可以添加以下内容。

Then, in your code behind, you can add the following.

    private const int WM_SCROLL = 276; // Horizontal scroll 
    private const int SB_LINELEFT = 0; // Scrolls one cell left 
    private const int SB_LINERIGHT = 1; // Scrolls one line right

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    private static extern int SendMessage(IntPtr hWnd, int wMsg, IntPtr wParam, IntPtr lParam); 

    private void RichTextBox_MouseWheel(object sender, MouseEventArgs e)
    {
        if (ModifierKeys == Keys.Shift)
        {
            var direction = e.Delta > 0 ? SB_LINELEFT : SB_LINERIGHT;

            SendMessage(this.richTextBox.Handle, WM_SCROLL, (IntPtr)direction, IntPtr.Zero);
        }
    }

有关的常量值的详细信息，请参阅下面的这样：How我以编程方式滚动的WinForms控制？

For more information on the const values, see the following SO: How do I programmatically scroll a winforms control?

使用Alvin's溶液的如果可能的。它的的更好的方式的

Use Alvin's solution if possible. It's way better.