RichTextBox 未正确更新插入符位置
我有一个使用 WinForms RTB 的 keyDown 事件的处理程序，它具有以下代码：
GetTextAtLoc(RTB->SelectionStart); // selects some text at the caret's position
RTB->SelectedText = "SomeOfMyOwn";
GetTextAtLoc(RTB->SelectionStart); // selects the replacement string
RTB->SelectionStart += RTB->SelectionLength - 1;
虽然此代码似乎完成了其工作（SelectionStart/Length 属性已正确更新），但插入符号不会移动到新字符串的末尾- 它显示了 GetTextAtLoc 第一次调用时的位置。重画文本框似乎也没有任何效果。
I have a handler consuming the keyDown event of a WinForms RTB, that has the following code:
GetTextAtLoc(RTB->SelectionStart); // selects some text at the caret's position
RTB->SelectedText = "SomeOfMyOwn";
GetTextAtLoc(RTB->SelectionStart); // selects the replacement string
RTB->SelectionStart += RTB->SelectionLength - 1;
While this code seems to do its job (SelectionStart/Length properties are updated correctly), the caret doesn't move to the end of the new string - It says right where it was at the time of GetTextAtLoc's first call. Redrawing the textbox doesn't seem to have any effect either.
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评论（2）
问题似乎已经解决了。不幸的是，不知道是什么带来了这种变化。关闭此线程。
The problem seems to have fixed itself. Dunno what brought about the change, unfortunately. Closing this thread.
您没有指定新长度（因此：1-1=0）。尝试如下：
SelectionStart += (length("SomeOfMyOwn"))
You did not specify the new length (and is therefor: 1-1=0). Try something like:
SelectionStart += (length("SomeOfMyOwn"))