如何知道用户编辑 WPF DataGrid 单元格时为空? [英] How to know while user editing the WPF DataGrid Cell is empty?

问题描述

我有一个 WPF DataGrid.用户可以编辑cell中的数据.我想要一个 event，因为我想检查 cell 是否为 empty.用户可以使用Del Backspace Cut 选项等来清空数据

I have a WPF DataGrid. The users can edit the data in cell. I want a event in that I want to check if cell is empty. User can empty the data by using Del Backspace Cut options etc.

给我一​​个 event 和 event handler 来做到这一点.我已经尝试过 OnCellEditEnding event 但这只会在编辑完成时触发.我想在每次用户 inputs 时动态检查 cell 是否为空.

Give me a event and event handler to do that. I already tries OnCellEditEnding event but this will trigger only if edit is finished. I want to check cell is empty dynamically each time when user inputs.

推荐答案

每个数据网格单元在处于编辑模式时都有一个文本框作为其内容.您可以在按键按下时检查该文本框中写入的文本长度(通过处​​理 onKeyDown 或 onPreviewKeyDown 事件)

each datagridcell has a textbox as its content when it is in the edit mode. you can check the text Length written in that textbox whenever a key is down (by handling onKeyDown or onPreviewKeyDown event)

使用 PreparingCellForEdit 事件，像这样:

use PreparingCellForEdit event, sth like this:

void MainDataGrid_PreparingCellForEdit(object sender, DataGridPreparingCellForEditEventArgs e)
{
   TextBox tb = e.Column.GetCellContent(e.Row) as TextBox;
   tb.TextChanged+=new TextChangedEventHandler(tb_TextChanged); 
}

void tb_TextChanged(object sender, TextChangedEventArgs e)
{
   //here, something changed the cell's text. you can do what is neccesary
}

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