如何更改特定单元格的DataGridTemplateColumn DataTemplate元素的属性 [英] How can I change the properties of a DataGridTemplateColumn DataTemplate Element for a specific cell
问题描述
我之前创建的DataGrid出现问题。 DataGrid显示有关项目任务的信息。现在,我必须使开始日期和结束日期列可编辑。为此,我使用以下代码更改了DataGridTextColumn:
I have a problem with my DataGrid I created a while ago. The DataGrid shows informations about project tasks. Now I have to make the start- and end-date column editable. For this purpose I changed the DataGridTextColumn with the following code:
<DataGridTemplateColumn Header="Start" Width="100" CanUserReorder="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<DatePicker
x:Name="DpStartDate"
SelectedDate="{Binding PlannedStart, StringFormat=\{0:dd.MM.yyyy\}}"
IsEnabled="False"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
到目前为止很好。现在的问题是,如果任务处于正确的状态以更改日期,我必须检查每一行。如果是这样,我必须启用DatePicker。在后面的代码中,我这样尝试过:
So far so good. Now the problem is that I have to check each row if the Task is in the right state to have the date changed. If so I have to enable the DatePicker. In the code behind I tried it like this:
for(int _i = 0; _i < DgvProjectTaskList.Items.Count; _i++)
{
switch (((TaskListViewModel) DgvProjectTaskList.Items[_i]).Task.State)
{
case TaskStates.InWork:
{
DatePicker _dpStart = DgvProjectTaskList.Columns[4].GetCellContent(_i) as DatePicker;
_dpStart.IsEnabled = false;
DatePicker _dpEnd = DgvProjectTaskList.Columns[5].GetCellContent(_i) as DatePicker;
_dpEnd.IsEnabled = true;
break;
}
case TaskStates.Done:
{
DatePicker _dpStart = DgvProjectTaskList.Columns[4].GetCellContent(_i) as DatePicker;
_dpStart.IsEnabled = false;
DatePicker _dpEnd = DgvProjectTaskList.Columns[5].GetCellContent(_i) as DatePicker;
_dpEnd.IsEnabled = false;
break;
}
default:
{
DatePicker _dpStart = DgvProjectTaskList.Columns[4].GetCellContent(_i) as DatePicker;
_dpStart.IsEnabled = true;
DatePicker _dpEnd = DgvProjectTaskList.Columns[5].GetCellContent(_i) as DatePicker;
_dpEnd.IsEnabled = true;
break;
}
}
}
问题是 GetCellContent ,每次都返回null。所以我的问题是如何分别更改每一行中的DatePicker?
预先感谢!
The problem is that "GetCellContent" return null everytime. So my question is how can I change the DatePicker in every row separately? Thanks in advance!
推荐答案
我认为您应该可以这样做:
I think you should be able to do it this way:
var contentPresenter = DgvProjectTaskList.Columns[4].GetCellContent(item);
var datePicker = VisualTreeHelper.GetChild(contentPresenter, 0) as DatePicker;
datePicker.IsEnabled = true;
GetCellContent()
返回 ContentPresenter
第一个孩子是 DatePicker
如果尝试此操作,它将起作用:
If you try this it will work:
foreach (var item in DgvProjectTaskList.Items)
{
bool enable = item.Task.State != TaskStates.Done;
var contentPresenter = Data.Columns[4].GetCellContent(item );
var picker = VisualTreeHelper.GetChild(contentPresenter, 0) as DatePicker;
picker.IsEnabled = enable;
contentPresenter = Data.Columns[5].GetCellContent(item );
picker = VisualTreeHelper.GetChild(contentPresenter, 0) as DatePicker;
picker.IsEnabled = enable;
}
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