WPF选择DataGrid中的所有复选框 [英] WPF Select all CheckBox in a DataGrid
问题描述
我试图选择一个DataGrid中的所有CheckBox，但是使用下面的代码却没有得到任何结果
这是我正在调用的函数当单击主CheckBox时
private void CheckUnCheckAll（对象发送者，RoutedEventArgs e）
{
CheckBox chkSelectAll =（（复选框）发送器）;
if（chkSelectAll.IsChecked == true）
{
dgUsers.Items.OfType< CheckBox>（）。ToList（）。ForEach（x => x.IsChecked = true）;
}
else
{
dgUsers.Items.OfType< CheckBox>（）。ToList（）。ForEach（x => x.IsChecked = false）;
}
}
dgUsers是DataGrid，但据我所知，任何复选框都是找到。
这是我使用的XAML或通过在datagrid中创建CheckBox
< DataGrid.Columns>
< DataGridCheckBoxColumn x：Name = col0 HeaderStyle = {StaticResource ColumnHeaderGripperStyle}>
< DataGridCheckBoxColumn.HeaderTemplate>
< DataTemplate>
< CheckBox Click = CheckUnCheckAll>
< / CheckBox>
< / DataTemplate>
< /DataGridCheckBoxColumn.HeaderTemplate>
< / DataGridCheckBoxColumn>
< DataGrid.Columns>
这是我的DataGrid的图片
是否可以通过编程方式选择所有复选框？
编辑
我已经尝试遵循
正确的操作位置在您的ViewModel。您的CheckBox可以具有三个状态，您想使用所有三个状态：
- 已检查-每个项目都已检查
- 未选中-未选中任何项目
- 不确定-一些项目已选中，某些未选中
您将希望在选中/取消选中某项时更新CheckBox，并在更改CheckBox时更新所有项目-仅执行此一种方法将使CheckBox处于无效状态，这可能会对它产生负面影响用户体验。我的建议：一路走好，并正确实施。为此，您需要知道引起更改的原因-条目的CheckBox或标题中的CheckBox。
这是我要怎么做：
首先，您需要为商品添加ViewModel，在这里使用了一个非常简化的示例，仅包含 IsChecked 属性。
公共类条目：INotifyPropertyChanged
{
私人布尔值_isChecked;
public bool IsChecked
{
get => _isChecked;
set
{
if（value == _isChecked）return;
_isChecked =值;
OnPropertyChanged（）;
}
}
公共事件PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
受保护的虚拟无效OnPropertyChanged（[CallerMemberName]字符串propertyName = null）
{
PropertyChanged？.Invoke（this，new PropertyChangedEventArgs（propertyName）） ;
}
}
您的主ViewModel将具有所有项的集合。每当项目的 IsChecked 属性更改时，您都必须检查所有项目是否已选中/未选中，并更新标题中的CheckBox（或更确切地说，
public class ViewModel：INotifyPropertyChanged
{
public List< Entry>条目
{
get => _entries;
set
{
if（Equals（value，_entries））return;
_entries =值；
OnPropertyChanged（）;
}
}
public ViewModel（）
{
//只是一些演示数据
Entries = new List< Entry>
{
个新Entry（），
个新Entry（），
个新Entry（），
个新Entry（）
}；
//确保聆听更改。
//如果添加/删除项目，也不要原谅添加/删除事件处理程序
foreach（条目中的条目）
{
entry.PropertyChanged + = EntryOnPropertyChanged;
}
}
private void EntryOnPropertyChanged（object sender，PropertyChangedEventArgs args）
{
//仅重新检查IsChecked属性是否已更改
if（args.PropertyName == nameof（Entry.IsChecked））
RecheckAllSelected（）;
}
private void AllSelectedChanged（）
{
//此更改是否由其他更改引起？
//返回，因此如果（_allSelectedChanging）返回，我们不会弄乱
的事情；
试试
{
_allSelectedChanging = true;
//如果（AllSelected == true）
{
foreach（Entry kommune in Entries）
kommune。
kommune.IsChecked当然可以简化
= true;
}
else if（AllSelected == false）
{
foreach（Entry kommune in Entries）
kommune.IsChecked = false;
}
}
最后
{
_allSelectedChanging = false;
}
}
private void RecheckAllSelected（）
{
//此更改是否由其他更改引起？
//返回，因此如果（_allSelectedChanging）返回，我们不会弄乱
的事情；
试试
{
_allSelectedChanging = true;
if（Entries.All（e => e.IsChecked））
AllSelected = true;
else if（Entries.All（e =>！e.IsChecked））
AllSelected = false;
else
AllSelected = null;
}
最终
{
_allSelectedChanging = false;
}
}
公共布尔？ AllSelected
{
get => _allSelected;
set
{
if（value == _allSelected）return;
_allSelected =值;
//设置所有其他复选框
AllSelectedChanged（）;
OnPropertyChanged（）;
}
}
私人布尔值_allSelectedChanging;
私人列表<条目> _entries;
私人布尔？ _allSelected;
公共事件PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
受保护的虚拟无效OnPropertyChanged（[CallerMemberName]字符串propertyName = null）
{
PropertyChanged？.Invoke（this，new PropertyChangedEventArgs（propertyName）） ;
}
}
Demo XAML：
< DataGrid ItemsSource = {绑定条目} AutoGenerateColumns = False IsReadOnly = False CanUserAddRows = False> ;
< DataGrid.Columns>
< DataGridCheckBoxColumn Binding = {Binding IsChecked，UpdateSourceTrigger = PropertyChanged}>
< DataGridCheckBoxColumn.HeaderTemplate>
< DataTemplate>
< CheckBox IsChecked = {Binding RelativeSource = {RelativeSource Mode = FindAncestor，AncestorType = local：MainWindow}，Path = ViewModel.AllSelected}>全选< / CheckBox>
< / DataTemplate>
< /DataGridCheckBoxColumn.HeaderTemplate>
< / DataGridCheckBoxColumn>
< /DataGrid.Columns>
< / DataGrid>
I'm trying to select all CheckBox in a DataGrid but I didn't get any result using this code bellow
This is the function that I'm calling when the main CheckBox is clicked
private void CheckUnCheckAll(object sender, RoutedEventArgs e)
{
CheckBox chkSelectAll = ((CheckBox)sender);
if (chkSelectAll.IsChecked == true)
{
dgUsers.Items.OfType<CheckBox>().ToList().ForEach(x => x.IsChecked = true);
}
else
{
dgUsers.Items.OfType<CheckBox>().ToList().ForEach(x => x.IsChecked = false);
}
}
dgUsers is the DataGrid but as I realize any checkbox is found.
This is the XAML that I'm using tho create the CheckBox in the datagrid
<DataGrid.Columns>
<DataGridCheckBoxColumn x:Name="col0" HeaderStyle="{StaticResource ColumnHeaderGripperStyle}">
<DataGridCheckBoxColumn.HeaderTemplate>
<DataTemplate>
<CheckBox Click="CheckUnCheckAll" >
</CheckBox>
</DataTemplate>
</DataGridCheckBoxColumn.HeaderTemplate>
</DataGridCheckBoxColumn>
<DataGrid.Columns>
And this is the picture of my DataGrid
Is there some way to select all checkbox programatically ?
Edit I already tried to follow this steps
that you can see that my code is the same there but didn't work to me
TLDR; This is what you want, code below:
The proper place to do this would be in your ViewModel. Your CheckBox can have three states, all of which you want to make use of:
- Checked - Every item is checked
- Unchecked - No item is checked
- Indeterminate - Some items are checked, some are not
You will want to update the CheckBox whenever an item is checked/unchecked and update all items whenever the CheckBox was changed - implementing this only one way will leave the CheckBox in an invalid state which might have a negative impact on user experience. My suggestion: go all the way and implement it properly. To do this you need to be aware of which caused the change - the CheckBox of an entry or the CheckBox in the header.
Here is how I would do it:
First you need a ViewModel for your items, I've used a very simplified one here that only contains the IsChecked property.
public class Entry : INotifyPropertyChanged
{
private bool _isChecked;
public bool IsChecked
{
get => _isChecked;
set
{
if (value == _isChecked) return;
_isChecked = value;
OnPropertyChanged();
}
}
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
Your main ViewModel will have a collection of all items. Whenever an item's IsChecked property changes, you'll have to check if all items are checked/unchecked and update the CheckBox in the header (or rather the value of its datasource).
public class ViewModel : INotifyPropertyChanged
{
public List<Entry> Entries
{
get => _entries;
set
{
if (Equals(value, _entries)) return;
_entries = value;
OnPropertyChanged();
}
}
public ViewModel()
{
// Just some demo data
Entries = new List<Entry>
{
new Entry(),
new Entry(),
new Entry(),
new Entry()
};
// Make sure to listen to changes.
// If you add/remove items, don't forgat to add/remove the event handlers too
foreach (Entry entry in Entries)
{
entry.PropertyChanged += EntryOnPropertyChanged;
}
}
private void EntryOnPropertyChanged(object sender, PropertyChangedEventArgs args)
{
// Only re-check if the IsChecked property changed
if(args.PropertyName == nameof(Entry.IsChecked))
RecheckAllSelected();
}
private void AllSelectedChanged()
{
// Has this change been caused by some other change?
// return so we don't mess things up
if (_allSelectedChanging) return;
try
{
_allSelectedChanging = true;
// this can of course be simplified
if (AllSelected == true)
{
foreach (Entry kommune in Entries)
kommune.IsChecked = true;
}
else if (AllSelected == false)
{
foreach (Entry kommune in Entries)
kommune.IsChecked = false;
}
}
finally
{
_allSelectedChanging = false;
}
}
private void RecheckAllSelected()
{
// Has this change been caused by some other change?
// return so we don't mess things up
if (_allSelectedChanging) return;
try
{
_allSelectedChanging = true;
if (Entries.All(e => e.IsChecked))
AllSelected = true;
else if (Entries.All(e => !e.IsChecked))
AllSelected = false;
else
AllSelected = null;
}
finally
{
_allSelectedChanging = false;
}
}
public bool? AllSelected
{
get => _allSelected;
set
{
if (value == _allSelected) return;
_allSelected = value;
// Set all other CheckBoxes
AllSelectedChanged();
OnPropertyChanged();
}
}
private bool _allSelectedChanging;
private List<Entry> _entries;
private bool? _allSelected;
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
Demo XAML:
<DataGrid ItemsSource="{Binding Entries}" AutoGenerateColumns="False" IsReadOnly="False" CanUserAddRows="False">
<DataGrid.Columns>
<DataGridCheckBoxColumn Binding="{Binding IsChecked, UpdateSourceTrigger=PropertyChanged}">
<DataGridCheckBoxColumn.HeaderTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:MainWindow}, Path=ViewModel.AllSelected}">Select All</CheckBox>
</DataTemplate>
</DataGridCheckBoxColumn.HeaderTemplate>
</DataGridCheckBoxColumn>
</DataGrid.Columns>
</DataGrid>
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