WPF DataGrid：如何获取单元格的绑定表达式？
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WPF DataGrid: How to get binding expression of a cell?
提问by newman
I need to get access to the binding expression of the DataGrid cell in a DataGridTextColumn. For example:
我需要访问 DataGridTextColumn 中 DataGrid 单元格的绑定表达式。例如：
<DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
I managed to get the TextBlock associated with the cell:
我设法获得了与单元格关联的 TextBlock：
var cell = dataGrid.GetCellCtrl<TextBlock>(dataGrid.CurrentCell);
And cell seems to be correct. I can call
细胞似乎是正确的。我可以打电话
cell.SetValue(TextBlock.TextProperty, value);
To update the cell text. It seems to be working on the grid (number updated). However, as I realize after a while, the source doesn't get updated. It didn't help even if I turn UpdateSourceTrigger to PropertyChange. Then, I thought I need to get the binding expression and call UpdateSource explicitly.
更新单元格文本。它似乎在网格上工作（数字已更新）。然而，正如我在一段时间后意识到的那样，源代码没有得到更新。即使我将 UpdateSourceTrigger 转换为 PropertyChange，它也没有帮助。然后，我想我需要获取绑定表达式并显式调用 UpdateSource。
var bindingExpr = cell.GetBindingExpression(TextBlock.TextProperty);
but bindingExpr is always null. Why?
但 bindingExpr 始终为空。为什么？
EDIT: The original problem I had was that I can get to the binding TextBlock for the cell, and set the TextBlock.TextProperty. However, the source doesn't get updated. This is something I'm trying to resolve this problem.
编辑：我遇到的最初问题是我可以访问单元格的绑定 TextBlock，并设置 TextBlock.TextProperty。但是，源不会更新。这是我正在尝试解决此问题的方法。
回答by sa_ddam213
The TextBoxin the DataGridTextColumnwill not have a binding expression the column itself has the binding.
在TextBox中DataGridTextColumn不会有绑定表达式列本身所具有的约束力。
DataGridTextColumnis derived from DataGridBoundColumnwhich uses a BindingBaseproperty not TextBlock.TextProperty, However the Bindingproperty is not a DependancyPropertyso you will have to access using normal public properties.
DataGridTextColumn派生自DataGridBoundColumn它使用的BindingBase属性 not TextBlock.TextProperty，但是该Binding属性不是 aDependancyProperty因此您必须使用普通的公共属性进行访问。
So you will have to do a bit of casting as the Bindingproperty in DataGridTextColumnis type BindingBase.
因此，您将不得不进行一些转换，因为Bindingin 中的属性DataGridTextColumn是 type BindingBase。
Something like this should work (untested)
像这样的东西应该可以工作（未经测试）
var binding = (yourGrid.Columns[0] as DataGridBoundColumn).Binding as Binding;
回答by Max Pedro
TextBox t = e.EditingElement as TextBox; string b= t.GetBindingExpression(TextBox.TextProperty).ResolvedSourcePropertyName;
TextBox t = e.EditingElement as TextBox; 字符串 b= t.GetBindingExpression(TextBox.TextProperty).ResolvedSourcePropertyName;
