如何使用MVVM模式来绑定CurrentCell在WPF数据网格 [英] How to Bind CurrentCell in WPF datagrid using MVVM pattern

问题描述

我学习WPF MVVM模式。我被困在绑定的DataGrid 的CurrentCell 。基本上我需要的行索引和当前单元格的列索引

 <数据网格的AutoGenerateColumns =真
 SelectionUnit =单元格
 CanUserDeleteRows =真
的ItemsSource ={结合的结果}
 CurrentCell ={结合CellInfo}
 HEIGHT =282
的Horizo​​ntalAlignment =左
保证金=12,88,0,0
 NAME =DataGrid1中
 VerticalAlignment =评出的
 WIDTH =558
 =的SelectionMode单> 
  

下面是我的ViewModel

 私人用户PROCEDURENAME =新用户（）; 
 
公共DataGridCell CellInfo 
 {
得到
 {
返回procedureName.CellInfo; 
} 
 //设置
 // {
 // procedureName.CellInfo =价值; 
 // OnPropertyChanged（CellInfo）; 
 //} 
} 
  

下面是我的模型

 私人DataGridCell cellInfo; 
 
公共DataGridCell CellInfo 
 {
得到
 {
返回cellInfo; 
} 
 //设置
 // {
 // cellInfo =价值; 
 // OnPropertyChanged（CellInfo）; 
 //} 
} 
  

在我的ViewModel CellInfo 总是空。我不能够在的DataGrid 来获得从 currentcell 的值。请让我知道一种方法的视图模型来获得 CurrentCell 。

 如果（！CellInfo = NULL）
 {
 MessageBox.Show（价值是+ CellInfo.Column.DisplayIndex.ToString（））; 
} 
  

解决方案

有一个快速的poke-后围绕我注意到一个非常简单的解决您的问题。

所有的

首先有两个问题而不是一个在这里。你不能绑定 CellInfo A型 DataGridCell ，它需要的 DataGridCellInfo 为XAML不能转换它自己的。

其次在XAML中，你将需要添加模式= OneWayToSource 或模式=双向你的 CellInfo 绑定。

下面是一个粗略的例子半与你的原代码

XAML

 <数据网格的AutoGenerateColumns =真
 SelectionUnit =单元格
的SelectionMode =单
 HEIGHT =250WIDTH =525
的ItemsSource ={结合的结果}
 CurrentCell ={结合CellInfo，模式= OneWayToSource}/> 
  

VM

 私人DataGridCellInfo _cellInfo; 
公共DataGridCellInfo CellInfo 
 {
 {返回_cellInfo; } 
组
 {
 _cellInfo =价值; 
 OnPropertyChanged（CellInfo）; 
 MessageBox.Show（的String.Format（列：{0}，
 _cellInfo.Column.DisplayIndex = NULL _cellInfo.Column.DisplayIndex.ToString（）：！？索引超出范围！ ））; 
} 
} 
  

只是一个小提示 - 如果您调试应用程序，看它实际上告诉你，如果有一个与你绑定任何麻烦输出窗口。

希望这有助于！

ķ。

I am learning WPF MVVM pattern. I am stuck in Binding CurrentCell of datagrid. Basically I need the row index and column index of current cell.

<DataGrid AutoGenerateColumns="True" 
    SelectionUnit="Cell" 
    CanUserDeleteRows="True" 
    ItemsSource="{Binding Results}" 
    CurrentCell="{Binding CellInfo}" 
    Height="282" 
    HorizontalAlignment="Left" 
    Margin="12,88,0,0" 
    Name="dataGrid1" 
    VerticalAlignment="Top" 
    Width="558" 
    SelectionMode="Single">

Here is my ViewModel

private User procedureName = new User();

public  DataGridCell   CellInfo
{
    get
    {
        return procedureName.CellInfo;
    }
    //set
    //{
    //    procedureName.CellInfo = value;
    //    OnPropertyChanged("CellInfo");
    //}
}

Here is my Model

private DataGridCell cellInfo;

public DataGridCell CellInfo
{
    get
    {
        return cellInfo;
    }
    //set
    //{
    //    cellInfo = value;
    //    OnPropertyChanged("CellInfo");
    //}
}

And in my ViewModel CellInfo is always null. I am not able to get the value from the currentcell in datagrid. Please let me know a way to getCurrentCell in the ViewModel.

if (CellInfo != null)
{
    MessageBox.Show("Value is" + CellInfo.Column.DisplayIndex.ToString());
}

解决方案

After having a quick poke-around I've noticed a very simple solution to your problem.

First of all there's two problems rather then one here. You cannot bind a CellInfo of a type DataGridCell, it needs to be DataGridCellInfo as xaml cannot convert it on its own.

Secondly in your xaml you will need to add Mode=OneWayToSource or Mode=TwoWay to your CellInfo binding.

Here is a rough example semi-related to your original code

XAML

<DataGrid AutoGenerateColumns="True"
          SelectionUnit="Cell"
          SelectionMode="Single"
          Height="250" Width="525" 
          ItemsSource="{Binding Results}"
          CurrentCell="{Binding CellInfo, Mode=OneWayToSource}"/>

VM

private DataGridCellInfo _cellInfo;
public DataGridCellInfo CellInfo
{
    get { return _cellInfo; }
    set
    {
        _cellInfo = value;
        OnPropertyChanged("CellInfo");
        MessageBox.Show(string.Format("Column: {0}",
                        _cellInfo.Column.DisplayIndex != null ? _cellInfo.Column.DisplayIndex.ToString() : "Index out of range!"));
    }
}

Just a small tip - if you debug your app and look at the Output window it actually tells you if there is any troubles with your bindings.

Hope this helps!

K.

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