我挣扎着一个DataGridView中移动在一个文本框编辑控件插入符号，一个排队一线下来，就像用户将按下上时和向下箭头得到。
所以，我的意思并不是作为行是什么换行符之间，我的意思是行作为什么是文本框的左侧和右侧之间。
我不能使用GetCharIndexFromPosition和GetPositionFromCharIndex因为不是所有的文本将始终在文本框中显示区显示。
编辑：我不能模拟按键响应，因为我处理的一个DataGridView中的文本框的细胞。 我的目标是实际上正在箭头键做自己会做一个正常的文本框的东西，而不是从行到行跳跃。
这应该工作。
Point pOld = textBox1.GetPositionFromCharIndex(textBox1.SelectionStart);
Point pNew = new Point(pOld.X, pOld.Y + textBox1.Font.Height)
int charIndex = textBox1.GetCharIndexFromPosition(pNew);
textBox1.SelectionStart = charIndex;
我不认为这是最干净的解决方案，但。 也许你应该考虑在DataGridView属性/密钥处理。
该方法GetPositionFromCharIndex()和GetCharIndexFromPosition()有两个限制：
TextBox.SelectionStart是用于在线路的端部的插入符号并在下一行的开头插入符是相同的。 为了解决这个问题，您可以：
我所遇到的另一个问题是， TextBox.Lines指的是由新行字符分隔逻辑线路，而功能TextBox.GetLineFromCharIndex()和TextBox.GetFirstCharIndexFromLine()是指视觉线，因为它们被显示在文本框（即，从侧到文本框的侧面，而不存在具有是新行字符）。 不要混合起来。
生成的代码（丑，你可以要求，但工作）如下：
class Utils
{
[DllImport("user32.dll")]
static extern bool GetCaretPos(out System.Drawing.Point lpPoint);
public static void LineUp(TextBox tb)
{
int oldCharIndex = tb.SelectionStart;
int oldLineNo = tb.GetLineFromCharIndex(oldCharIndex);
System.Drawing.Point oldCharPos = tb.GetPositionFromCharIndex(oldCharIndex);
System.Drawing.Point oldCaretPos;
if (GetCaretPos(out oldCaretPos))
{
if (oldCharPos == oldCaretPos)
{
if (oldLineNo > 0)
{
tb.SelectionStart = tb.GetFirstCharIndexFromLine(oldLineNo - 1);
tb.ScrollToCaret();
System.Drawing.Point newPos = new System.Drawing.Point(oldCaretPos.X, oldCaretPos.Y - tb.Font.Height);
int newCharIndex = tb.GetCharIndexFromPosition(newPos);
if (tb.GetPositionFromCharIndex(newCharIndex).Y == newPos.Y)
{
tb.SelectionStart = newCharIndex;
}
else
{
tb.SelectionStart = tb.GetFirstCharIndexFromLine(oldLineNo - 1);
System.Windows.Forms.SendKeys.Send("{END}");
}
}
}
else
{
if (oldLineNo > 1)
{
tb.SelectionStart = tb.GetFirstCharIndexFromLine(oldLineNo - 2);
tb.ScrollToCaret();
System.Drawing.Point newPos = new System.Drawing.Point(oldCaretPos.X, oldCaretPos.Y - tb.Font.Height);
int newCharIndex = tb.GetCharIndexFromPosition(newPos);
if (tb.GetPositionFromCharIndex(newCharIndex).Y == newPos.Y)
{
tb.SelectionStart = newCharIndex;
}
else
{
tb.SelectionStart = tb.GetFirstCharIndexFromLine(oldLineNo - 2);
System.Windows.Forms.SendKeys.Send("{END}");
}
}
}
}
}
public static void LineDown(TextBox tb)
{
int oldCharIndex = tb.SelectionStart;
int oldLineNo = tb.GetLineFromCharIndex(oldCharIndex);
System.Drawing.Point oldCharPos = tb.GetPositionFromCharIndex(oldCharIndex);
System.Drawing.Point oldCaretPos;
if (GetCaretPos(out oldCaretPos))
{
if (oldCharPos == oldCaretPos)
{
if (oldLineNo < tb.GetLineFromCharIndex(tb.Text.Length - 1))
{
tb.SelectionStart = tb.GetFirstCharIndexFromLine(oldLineNo + 1);
tb.ScrollToCaret();
System.Drawing.Point newPos = new System.Drawing.Point(oldCaretPos.X, oldCaretPos.Y + tb.Font.Height);
int newCharIndex = tb.GetCharIndexFromPosition(newPos);
if (tb.GetPositionFromCharIndex(newCharIndex).Y == newPos.Y)
{
tb.SelectionStart = newCharIndex;
}
else
{
tb.SelectionStart = tb.GetFirstCharIndexFromLine(oldLineNo + 1);
System.Windows.Forms.SendKeys.Send("{END}");
}
}
}
else
{
System.Drawing.Point newPos = new System.Drawing.Point(oldCaretPos.X, oldCaretPos.Y + tb.Font.Height);
int newCharIndex = tb.GetCharIndexFromPosition(newPos);
if (tb.GetPositionFromCharIndex(newCharIndex).Y == newPos.Y)
{
tb.SelectionStart = newCharIndex;
}
else
{
tb.SelectionStart = tb.GetFirstCharIndexFromLine(oldLineNo);
System.Windows.Forms.SendKeys.Send("{END}");
}
}
}
}
}
信用的理念去这个答案 ，你可能还需要看看上GetCaretPos参考MSDN及其他插入符的功能 。
/// ------------------------------------------------------------------------------------
/// <summary>
/// Processes up key when a grid cell is in the edit mode. This overrides the default
/// behavior in a grid cell when it's being edited so using the up arrow will move the
/// IP up one line rather than moving to the previous row.
/// </summary>
/// ------------------------------------------------------------------------------------
protected virtual bool ProcessUpKey(TextBox txtBox)
{
// Don't override the default behavior if all the text is selected or not multi-line.
if (txtBox.SelectedText == txtBox.Text || !txtBox.Multiline)
return false;
int selectionPosition = txtBox.SelectionStart;
// Getting the position after the very last character doesn't work.
if (selectionPosition == txtBox.Text.Length && selectionPosition > 0)
selectionPosition--;
Point pt = txtBox.GetPositionFromCharIndex(selectionPosition);
if (pt.Y == 0)
return false;
pt.Y -= TextRenderer.MeasureText("x", txtBox.Font).Height;
txtBox.SelectionStart = txtBox.GetCharIndexFromPosition(pt);
return true;
}
/// ------------------------------------------------------------------------------------
/// <summary>
/// Processes down key when a grid cell is in the edit mode. This overrides the default
/// behavior in a grid cell when it's being edited so using the down arrow will move the
/// IP down one line rather than moving to the next row.
/// </summary>
/// ------------------------------------------------------------------------------------
protected virtual bool ProcessDownKey(TextBox txtBox)
{
// Don't override the default behavior if all the text is selected or not multi-line.
if (txtBox.SelectedText == txtBox.Text || !txtBox.Multiline)
return false;
int chrIndex = txtBox.SelectionStart;
Point pt = txtBox.GetPositionFromCharIndex(chrIndex);
pt.Y += TextRenderer.MeasureText("x", txtBox.Font).Height;
var proposedNewSelection = txtBox.GetCharIndexFromPosition(pt);
if (proposedNewSelection <= chrIndex)
return false; // Don't let "down" take you *up*.
txtBox.SelectionStart = proposedNewSelection;
return true;
}
