获取DatagridviewComboBoxCell的SelectedIndex [英] Get DatagridviewComboBoxCell's SelectedIndex

问题描述

我有一个 Winforms 应用程序，它有一个 DataGridView 。
DataGridView 未绑定到数据源。我正在读取一个文本文件，并根据文件中的每一行，我将每行的值放在datagrid。

I have a Winforms application which has a DataGridView. The DataGridView is not bound to a datasource. I'm reading a text file and according to each line in the file, I'm placing the values of each row to the datagrid.

我在我的一列网格是 ComboBoxColumn 。它有一个项目的集合。

I have a column in my grid that is a ComboBoxColumn. It has a collection of items in it.

我的目标是将文件中的项目的索引保存到文件中。
但是，似乎 ComboBoxCell 没有 SelectedIndex 属性，如 ComboBox 。

My goal is to save to the file the index of the item that is displayed in the cell. However, it seems that ComboBoxCell doesn't have the SelectedIndex property like ComboBox.

请注意，只有当用户点击保存选项时，才需要知道项目的索引，所以我不相信editControlShowing事件是我的方式。

It is important to mention that I need to know the index of the item displayed only when the user hits "Save" option, So I don't believe that editingControlShowing event is my way to go.

推荐答案

嗯，你几乎是正确的：按顺序要找到选择的索引，您 需要编写 EditingControlShowing 事件，请务必保留对 ComboBox 在编辑过程中使用：

Well, you got it almost right: In order to find the chosen index you do need to code the EditingControlShowing event, just make sure to keep a reference to the ComboBox that is used during the edit:

  // hook up the event somwhere:
   dataGridView1.EditingControlShowing += dataGridView1_EditingControlShowing;

 // keep a reference to the editing comtrol:
 ComboBox combo = null;

 // fill the reference, once it is valid:
 void dataGridView1_EditingControlShowing(object sender, 
                                          DataGridViewEditingControlShowingEventArgs e)
 {
     combo = e.Control as ComboBox;
 }

现在可以使用它：

private void Save_Click(object sender, EventArgs e)
{
        int index = -1;
        if (combo != null) index = combo.SelectedIndex;
        // now do what you want..
}

注意，这只是一个最小的例子。如果您的用户在按保存按钮之前将编辑多个列和行，则需要存储 ComboBoxes ，或者较便宜的是 SelectedIndex ，也许在每个Cell的 CellEndEdit 事件中。单元格的标签是明显的存储位置：

Note that this is just a minimal example. If your users will edit several columns and rows before they press the 'Save' Buton, you will need to store either the ComboBoxes, or, less expensive, the SelectedIndex, maybe in the CellEndEdit event on a per Cell basis. The Cells' Tag are obvious storage places:

void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
   if (combo != null) 
       dataGridView1[e.ColumnIndex, e.RowIndex].Tag = combo.SelectedIndex;
}

在此版本中，您将显然会从标签，而不是从combo ..

In this version you will obviously retrieve the index form the Tag, not from combo..

当然你也可以找到一个项目从值像这样：

Of course you could also find an Item from the Value like this:

DataGridViewComboBoxCell dcc = 
                        (DataGridViewComboBoxCell)dataGridView1[yourColumn, yourRow];
int index = dcc.Items.IndexOf(dcc.Value);

但是，只需获得第一个拟合索引，而不是实际上是选择了..

But that will simply get the first fitting index, not the one that was actually chosen..

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