DataGridView的：自动向下滚动只有当滚动是在底部 [英] DataGridView: Scroll down automatically only if the scroll is at the bottom

问题描述

我有一个使用的dataGridView为表明会自动更新每隔一秒，加入行的dataGridView数据的程序。

当我想读围绕年初的东西，我滚动，即使数据更新，滚动条不下去，这是件好事。但我想滚动条往下走，只有当它在DataGridView的底部

我要当一个新的行添加到文本的行为：

如果滚动条是在底部，向下自动滚动显示。
如果滚动条在别处，不滚动

我对这个书面和遗憾的是不工作的代码是：

 私人无效liveDataTable_Scroll（对象发件人，ScrollEventArgs E）
 {
的scrollPosition = liveDataTable.FirstDisplayedScrollingRowIndex; 
 
如果（==的scrollPosition liveDataTable.RowCount  -  1）
 {
 IsScrolledToBottom = TRUE; 
} 
，否则
 {
 IsScrolledToBottom = FALSE; 
} 
} 
公共无效AddRowToDataGridMethod（）
 {
 dataTable.Rows.Add（）; 
 
如果（dataWin.IsScrolledToBottom ==真）
 dataWin.LiveDataTable.FirstDisplayedScrollingRowIndex =（dataWin.ScrollPosition + 1）; 
，否则
 dataWin.LiveDataTable.FirstDisplayedScrollingRowIndex = dataWin.ScrollPosition; 
} 
  

解决方案

您可以试试这个：

  INT firstDisplayed = liveDataTable.FirstDisplayedScrollingRowIndex; 
 INT显示= liveDataTable.DisplayedRowCount（真）; 
 INT lastVisible =（firstDisplayed +显示） -  1; 
 INT lastIndex的= liveDataTable.RowCount  -  1; 
 
 liveDataTable.Rows.Add（）; //添加你行
 
如果（lastVisible == lastIndex的）
 {
 liveDataTable.FirstDisplayedScrollingRowIndex = firstDisplayed + 1; 
} 
  

所以基本上检查是否最后一行是可见的，如果它是涡旋1行下添加新行之后。

I have a program that uses dataGridView for showing data that updates automatically every second by adding rows to dataGridView.

When I want to read something around the beginning, I scroll up, and even when data updates, the scroll bar doesn't go down, it is good. But I want the scroll bar to go down only when it is at the bottom of dataGridView.

The behavior I want when a new row is added to the text:

if the scrollbar is at the bottom, scroll down automatically. if the scrollbar is elsewhere, don't scroll.

The code I have written for this and unfortunately doesn't work is:

 private void liveDataTable_Scroll(object sender, ScrollEventArgs e)
 {
    ScrollPosition = liveDataTable.FirstDisplayedScrollingRowIndex; 

    if (ScrollPosition == liveDataTable.RowCount - 1)
    {
       IsScrolledToBottom = true;
    }
    else
    {
       IsScrolledToBottom = false;
    }            
 }
 public void AddRowToDataGridMethod()
 {
    dataTable.Rows.Add();

    if (dataWin.IsScrolledToBottom == true)
         dataWin.LiveDataTable.FirstDisplayedScrollingRowIndex = (dataWin.ScrollPosition + 1);
    else
         dataWin.LiveDataTable.FirstDisplayedScrollingRowIndex = dataWin.ScrollPosition;         
 }

解决方案

You can try this:

int firstDisplayed = liveDataTable.FirstDisplayedScrollingRowIndex;
int displayed = liveDataTable.DisplayedRowCount(true);
int lastVisible = (firstDisplayed + displayed) - 1;
int lastIndex = liveDataTable.RowCount - 1;

liveDataTable.Rows.Add();  //Add your row

if(lastVisible == lastIndex)
{
     liveDataTable.FirstDisplayedScrollingRowIndex = firstDisplayed + 1;
}

So basically check if the last row is visible and if it is scroll 1 row down after adding the new row.

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