如何在 C#/WPF 中刷新 DataGrid？
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How to refresh DataGrid in C# / WPF?
提问by Ben Clarke
private void cmbEmployee_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
string employee = (e.AddedItems[0] as ComboBoxItem).Content as string;
dgFake.ItemsSource = newdal2.SelectUser(employee).Tables[0].DefaultView;
}
This method populates the data grid on my WPF windows form by a specific employee when this employee is clicked from a combo box, however, when I click another employee after the first, it doesn't refresh the data grid, but instead adds that employee's data beneath the first.
当从组合框中单击该员工时，此方法由特定员工在我的 WPF 窗口表单上填充数据网格，但是，当我在第一个员工之后单击另一名员工时，它不会刷新数据网格，而是添加该员工的数据低于第一个。
How do you refresh or delete the items in a Data Grid baring in mind this is on WPF Xaml Windows Forms, and it is not a DataGridView. I have tried these already and none have worked:
你如何刷新或删除数据网格中的项目，记住这是在 WPF Xaml Windows 窗体上，而不是 DataGridView。我已经尝试过这些，但都没有奏效：
dgFake.Items.Refresh();
dgFake.Items.Remove(); //Required a remove item passed to the method, so too specific
dgFake.Itemssource = "";
回答by Sheridan
In general using WPF, we manipulate data, not UI elements. Therefore, after Bindinga collection property to the DataGrid.ItemsSourceproperty, we can simply work with the collection property:
通常使用 WPF，我们操作数据，而不是UI 元素。因此，在Binding对属性进行集合属性之后DataGrid.ItemsSource，我们可以简单地使用集合属性：
In XAML:
在 XAML 中：
<DataGrid ItemsSource="{Binding YourCollection}" ... />
Then in code:
然后在代码中：
YourCollection.Clear();
Or to change items:
或更改项目：
YourCollection = someNewCollection;
You will need to implement the
INotifyPropertyChangedinterfacein order for theDataGridto update automatically after changing the data like this.
您将需要实现该
INotifyPropertyChanged接口，以便DataGrid在像这样更改数据后自动更新。
UPDATE >>>
更新 >>>
In response to the comment: 'I have added the XAML code, when you talk about 'YourCollection' in the XAML code what needs to be put here?':
回应评论：“我已经添加了 XAML 代码，当你在 XAML 代码中谈论‘YourCollection’时，需要在这里放什么？”：
You'll need to create a Bindablecollection property in your code; this can either be a DependencyPropertyin your code behind, or a CLR property that implements the INotifyPropertyChangedinterface. We generally don't display database elements in the UI, instead preferring to define object classes with the required properties:
您需要Bindable在代码中创建一个集合属性；这可以是DependencyProperty后面代码中的 ，也可以是实现INotifyPropertyChanged接口的 CLR 属性。我们通常不会在 UI 中显示数据库元素，而是更喜欢定义具有所需属性的对象类：
public static DependencyProperty EmployeesProperty = DependencyProperty.Register(
"Employees", typeof(ObservableCollection<Employee>), typeof(YourUserControl));
public ObservableCollection<Employee> Employees
{
get { return (ObservableCollection<Employee>)GetValue(EmployeesProperty); }
set { SetValue(EmployeesProperty, value); }
}
Then in your cmbEmployee_SelectionChangedhandler method, you can update the collection property's value with something like this:
然后在您的cmbEmployee_SelectionChanged处理程序方法中，您可以使用以下内容更新集合属性的值：
private void cmbEmployee_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
Employees = new ObservableCollection<Employee>();
string employee = (e.AddedItems[0] as ComboBoxItem).Content as string;
foreach (DataRow row in newdal2.SelectUser(employee).Tables[0].Rows)
{
Employees.Add(new Employee(row.Id, row.Name, row.Whatever));
}
Employees = newdal2.SelectUser(employee).Tables[0].DefaultView;
}
