WPF Datagrid：以编程方式编辑单元格 [英] WPF Datagrid: Programmatically editing a cell

问题描述

我有一个单元格需要设置它的值被点击。它是多对不同的属性。

I have a cell that needs its value to be set on it just being clicked. It is multibound to different properties.

我应该在哪里做这个？我一直在尝试在datagrid beginineedit处理程序这样做（没有太多的成功）。我可以手动点击两次（一次选择单元格，然后开始编辑），并且该值被设置。但是我想以编程方式执行...

Where am I supposed to do this? I have been trying to do it in the datagrid beginingedit handler like this (without much success). I am able to manually click twice(once to select cell and then to start edit) and the value gets set. But I want to do this programmatically...

private void MyDataGrid_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
{

TextBlock t = e.EditingEventArgs.OriginalSource as TextBlock;
if (t == null) return;
t.Text = SimulatedEdit();

// All this below is just me trying different thing. Not sure what I need to be doing
e.EditingEventArgs.Handled = true;
MyDataGrid.CommitEdit();
MyDataGrid.UnselectAllCells();
}

这是columntemplate的设置方式

This is how the columntemplate is setup

MultiBinding tempmb = new MultiBinding();
Binding tempXB = new Binding("X");
Binding temptYB = new Binding("Y");
tempmb.Bindings.Add(tempXB);
tempmb.Bindings.Add(temptYB);
tempmb.ConverterParameter = "ggrid";
tempmb.Converter = new LabelDecider();

            DataGridTemplateColumn dgtc = new DataGridTemplateColumn
            {
                Header = "blah",  CanUserSort = false, CanUserReorder = false,
            };
            DataTemplate t = new DataTemplate();
            FrameworkElementFactory f = new FrameworkElementFactory(typeof(TextBlock));
            f.SetBinding(TextBlock.TextProperty, tempmb);

            // Setup background color binding
            MultiBinding colorb = new MultiBinding();
            colorb.Bindings.Add(tempX);
            colorb.Bindings.Add(tempY);
            colorb.ConverterParameter = "color";
            colorb.Converter = new LabelDecider();
            f.SetBinding(TextBlock.BackgroundProperty, colorb);
            t.VisualTree = f;
            //Every columns Text and Background are using bindings
            dgtc.CellTemplate = t;

            //setup editing template
            DataTemplate ced = new DataTemplate();
            FrameworkElementFactory f2 = new FrameworkElementFactory(typeof(TextBox));
            MultiBinding tempmb2 = new MultiBinding();
            tempmb2.Bindings.Add(tempXB);
            tempmb2.Bindings.Add(tempYB);
            tempmb2.Mode = BindingMode.TwoWay;
            tempmb2.ConverterParameter = "ggrid";
            tempmb2.Converter = new LabelDecider(rDestination.Recievers[k]);

            tempmb2.UpdateSourceTrigger = UpdateSourceTrigger.LostFocus;
            f2.SetBinding(TextBox.TextProperty, tempmb2);
            ced.VisualTree = f2;
            dgtc.CellEditingTemplate = ced;

            MyDataGrid.Columns.Add(dgtc);

推荐答案

不知道我是否正确理解你的问题;您希望以编程方式访问和更改DataGridCell内容。请检查下面的例子;我已经在Datagrid中添加了一个SelectedCellsChanged连接器，每次选择新的单元格时都应该被触发;拥有DataGridCellInfo对象，您可以访问DataGridCell对象并更改其内容。

not sure if I'm understanding your question correctly; it looks like you want to access and change the DataGridCell content programmatically. Pls check an example below; I've added a SelectedCellsChanged even hander to the datagrid, it should be triggered every time new cell(s) is selected; having the DataGridCellInfo object you can get access to the DataGridCell object and change its Content.

private void dataGrid1_SelectedCellsChanged(object sender, SelectedCellsChangedEventArgs e)
{
    foreach (DataGridCellInfo cellInfo in dataGrid1.SelectedCells)
    {
        // this changes the cell's content not the data item behind it
        DataGridCell gridCell = TryToFindGridCell(dataGrid1, cellInfo);
        if (gridCell!=null) gridCell.Content = "changed!!!"; 
    }
}

static DataGridCell TryToFindGridCell(DataGrid grid, DataGridCellInfo cellInfo)
{
    DataGridCell result = null;
    DataGridRow row = (DataGridRow)grid.ItemContainerGenerator.ContainerFromItem(cellInfo.Item);
    if (row!=null)
    {
        int columnIndex = grid.Columns.IndexOf(cellInfo.Column);
        if (columnIndex>-1)
        {
            DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row);
            result = presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex) as DataGridCell;
        }
    }
    return result;
}

static T GetVisualChild<T>(Visual parent) where T : Visual
{    
    T child = default(T);    
    int numVisuals = VisualTreeHelper.GetChildrenCount(parent);    
    for (int i = 0; i < numVisuals; i++)    
    {        
        Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);        
        child = v as T;        
        if (child == null)        
        {            
            child = GetVisualChild<T>(v);        
        }        
        if (child != null)        
        {            
            break;        
        }    
    }    
    return child;
}

GetVisualChild的代码取自这里

code of GetVisualChild is taken from here

希望它能帮助你，你也可能想看看 BeginEdit of一个特定的Cell从代码背后的问题在SO上。我想它也可以给你一些想法

hope it's going to help you, also you maight want to take a look at the BeginEdit of a specific Cell from code behind question on SO. I guess it can also give you some ideas

敬意

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