我有一个 WPF 4.0 DataGrid,它使用 AutoGenerateColumns=True 绑定到 DataTable。这些列是动态的,但我知道总会有一个名为 ID 的列,我想隐藏此列。我有办法做到这一点吗?
在您的数据网格中,订阅
AutoGeneratingColumn
事件,事件 args
(DataGridAutoGeneratingColumnEventArgs
) 有列名和“Cancel
”,如果列名是 ID 则设置 Cancel = true
。应该可以解决问题。
您可以使用行为(可重用代码)来完成这项工作...这样您就可以使用将列可见性集中在一个地方的属性。
用途:
<Window
...
xmlns:extension="clr-namespace:WpfControlLibrary.Extension;assembly=WpfControlLibrary">
<DataGrid ...
extension:DataGridBehavior.UseBrowsableAttributeOnColumn="True">
...
public class YourObjectItem
{
[Browsable(false)]
public Assembly Assembly { get; set; }
代码:
using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
namespace HQ.Wpf.Util.Behaviors
{
/// <summary>
/// Using this behavior on a dataGRid will ensure to display only columns with "Browsable Attributes"
/// </summary>
public static class DataGridBehavior
{
public static readonly DependencyProperty UseBrowsableAttributeOnColumnProperty =
DependencyProperty.RegisterAttached("UseBrowsableAttributeOnColumn",
typeof(bool),
typeof(DataGridBehavior),
new UIPropertyMetadata(false, UseBrowsableAttributeOnColumnChanged));
public static bool GetUseBrowsableAttributeOnColumn(DependencyObject obj)
{
return (bool)obj.GetValue(UseBrowsableAttributeOnColumnProperty);
}
public static void SetUseBrowsableAttributeOnColumn(DependencyObject obj, bool val)
{
obj.SetValue(UseBrowsableAttributeOnColumnProperty, val);
}
private static void UseBrowsableAttributeOnColumnChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
var dataGrid = obj as DataGrid;
if (dataGrid != null)
{
if ((bool)e.NewValue)
{
dataGrid.AutoGeneratingColumn += DataGridOnAutoGeneratingColumn;
}
else
{
dataGrid.AutoGeneratingColumn -= DataGridOnAutoGeneratingColumn;
}
}
}
private static void DataGridOnAutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
var propDesc = e.PropertyDescriptor as PropertyDescriptor;
if (propDesc != null)
{
foreach (Attribute att in propDesc.Attributes)
{
var browsableAttribute = att as BrowsableAttribute;
if (browsableAttribute != null)
{
if (!browsableAttribute.Browsable)
{
e.Cancel = true;
}
}
// As proposed by "dba" stackoverflow user on webpage:
// https://stackoverflow.com/questions/4000132/is-there-a-way-to-hide-a-specific-column-in-a-datagrid-when-autogeneratecolumns
// I added few next lines:
var displayName = att as DisplayNameAttribute;
if (displayName != null)
{
e.Column.Header = displayName.DisplayName;
}
}
}
}
}
}
其他可能性是
Visibility.Collapsed
:
private void dataGrid_AutoGeneratingColumn(object sender,
DataGridAutoGeneratingColumnEventArgs e)
{
//Set properties on the columns during auto-generation
switch (e.Column.Header.ToString())
{
case "rownameYouWantToHide":
e.Column.Visibility = Visibility.Collapsed;
break;
}
}
我不会说这是一个很好的解决方案...但是...你可以多一个抽象层 例如,假设您有一个像这样的对象:
public class Foo
{
public string Id { get; set; }
public string Property2 { get; set; }
public string Property3 { set; get; }
}
您不需要 Id 列,因此您创建新对象
public class Foo2
{
public string Property2 { get; set; }
public string Property3 { set; get; }
}
然后将 Foo 映射/转换为 Foo2 就完成了。
另一种可能的方法(并不总是可能)是将访问修饰符更改为internal
public class Foo
{
internal string Id { get; set; }
public string Property2 { get; set; }
public string Property3 { set; get; }
}
这样您也不会生成 Id 列。
我使用
Browsable
属性和 Visibility: Collapsed
实现了这一点
型号
class CourseModel
{
[Description("")]
[ReadOnly(false)]
public bool Select { get; set; } = true; // Checkbox
[Description("Course ID")]
[ReadOnly(true)]
[Browsable(false)]
public string ID { get; set; } // Hidden column
[Description("Course Title")]
[ReadOnly(true)]
public string Title { get; set; }
}
自定义控件扩展:
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
namespace MyProject.FrontEnd.Controls
{
class CustomDataGrid : DataGrid
{
// Take attributes of POCO, if available (https://stackoverflow.com/a/17255496/979621)
protected override void OnAutoGeneratingColumn(DataGridAutoGeneratingColumnEventArgs e)
{
try
{
base.OnAutoGeneratingColumn(e);
var propertyDescriptor = e.PropertyDescriptor as PropertyDescriptor;
e.Column.Header = propertyDescriptor.Description;
e.Column.IsReadOnly = propertyDescriptor.IsReadOnly;
e.Column.Visibility = propertyDescriptor.IsBrowsable
? Visibility.Visible
: Visibility.Collapsed;
}
catch
{
// ignore; retain field defaults
}
}
}
}
视图模型
public ObservableCollection<CourseModel> Courses { get; set; }
XAML
<Window
...
xmlns:controls="clr-namespace:MyProject.FrontEnd.Controls"
...
>
...
<controls:CustomDataGrid x:Name="courses"
ItemsSource="{Binding Path=Courses, Mode=TwoWay,
NotifyOnSourceUpdated=True, NotifyOnTargetUpdated=True}" />
我不能代表 4 说话,但是在 3.5 SP1 中这是不可能的,至少在不注册我想不惜一切代价避免的事件的情况下是不可能的。
您可以做的是将生成代码更改为
AutoGenerateColumns=False
,然后只需将您关心的列放置在 XAML 中,因为底层数据仍然会适当地放置在列中
<dg:DataGridTextColumn Header="Display" Binding="{Binding DisplayName}"/>
<dg:DataGridTextColumn Header="Host" Binding="{Binding HostName}"/>
<dg:DataGridTextColumn Header="Database" Binding="{Binding Database}"/>
<dg:DataGridTextColumn Header="Username" Binding="{Binding Username}"/>
<dg:DataGridTextColumn Header="Password" Binding="{Binding Password}"/>
这将允许您显示与基础模型相关的唯一列,以及将
Header
更改为您认为合适的显示方式,这样您就不会受到模型上的 Property
名称的束缚。
我最近做了这个并想分享我的解决方案:
我刚刚制作了一个视图模型,我希望数据网格遵循,并且对于我希望它忽略的字段(即不自动生成列),只需将这些字段设置为私有即可。工作起来就像一个魅力,并且不需要不必要的代码。
例如,这是我传递给包含数据网格的视图的视图模型。我只需将不需要的字段设置为私有列即可获得所需的一切,如我的示例中的“FullPath”字段所示。我知道这可能并不适用于所有情况,但对我来说效果很好。
namespace dev
{
/// <summary>
/// View model for tag list view in data grid
/// </summary>
public class TagDataViewModel : BaseViewModel
{
/// <summary>
/// Default constructor
/// </summary>
/// <param name="path">The JSONPath to this item</param>
public TagDataViewModel(string path)
{
FullPath = path;
}
/// <summary>
/// Gets and sets the JSONPath to this item
/// </summary>
private string FullPath { get; set; }
/// <summary>
/// Gets the name
/// </summary>
public string Name => ProjectHelpers.GetPropertyValue(FullPath, "Name");
/// <summary>
/// Gets the address
/// </summary>
public string Address => ProjectHelpers.GetPropertyValue(FullPath, "Address");
/// <summary>
/// Gets the data type
/// </summary>
public string DataType => ProjectHelpers.GetPropertyValue(FullPath, "DataType");
/// <summary>
/// Gets the scan rate
/// </summary>
public string ScanRate => ProjectHelpers.GetPropertyValue(FullPath, "ScanRate");
/// <summary>
/// Gets the scaling type
/// </summary>
public string ScalingType => ProjectHelpers.GetPropertyValue(FullPath, "ScalingType");
}
}
AutoGeneratingColumn="DataGridAutoGenColumnEvent" add it to XAML
并在代码侧粘贴它并替换您的模型值以跳过:
List<string> HeadersToSkip = new List<string> { "StockStatus" , "ImagePath" , "SupplyID" , "RemarksJson" , "PurchaseRequetID" , "DocumentsFolderPath" ,"" };
if (HeadersToSkip.Contains( e.Column.Header.ToString()))
{
e.Cancel = true;
}