blocks|key|24167|text|您在示例中所做的是遍历数据项，而不是遍历控件(我假设您没有作为ItemsSource的控件)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|24168|在您发布的链接中，YourClass是来自ViewModel的类，即网格行的数据对象。|offset|length|style|CODE|24169|这种方法只需对您的CommandParameter)：进行最少的代码更改即可工作(但我更喜欢在ViewModel中使用类似于将+IsChecked+绑定到+CheckUncheckCommand的CheckUncheckCommand%2B绑定的方式来处理它|BOLD|24170|<DataGridCheckBoxColumn+x:Name="col0"+HeaderStyle="{StaticResource+ColumnHeaderGripperStyle}"+DisplayIndex="0">

private+void+CheckUnCheckAll(object+sender,+RoutedEventArgs+e)
{
++++var+chkSelectAll+=+sender+as+CheckBox;
++++var+firstCol+=+dgUsers.Columns.OfType<DataGridCheckBoxColumn>().FirstOrDefault(c+=>+c.DisplayIndex+==+0);
++++if+(chkSelectAll+==+null+%7C%7C+firstCol+==+null+%7C%7C+dgUsers?.Items+==+null)
++++{
++++++++return;
++++}
++++foreach+(var+item+in+dgUsers.Items)
++++{
++++++++var+chBx+=+firstCol.GetCellContent(item)+as+CheckBox;
++++++++if+(chBx+==+null)
++++++++{
++++++++++++continue;
++++++++}
++++++++chBx.IsChecked+=+chkSelectAll.IsChecked;
++++}
}|code-block|syntax|javascript|24171|entityMap^0|0|9|9|0|9|G|1S|9|22|1H|9|G|1S|9|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@$D|W|E|X|F|J]|$D|Y|E|Z|F|J]|$D|10|E|11|F|J]|$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@]|A|$]]|$1|K|3|L|5|M|7|16|8|@]|9|@]|A|$N|O]]|$1|P|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|Q|$]]

What you do in your example is iterating through data item not through the controls(I suppose you have no controls as ItemsSource). 
In the link you have posted <code>YourClass</code> is the class from ViewModel, data object for grid's row. 

This one should work with minimal code changes on your side(but I would prefer to handle it in the ViewModel with something like CheckUncheckCommand + binding of <code>IsChecked</code> to the <code>CommandParameter</code>): 

<pre><code>&lt;DataGridCheckBoxColumn x:Name="col0" HeaderStyle="{StaticResource ColumnHeaderGripperStyle}" DisplayIndex="0"&gt;

private void CheckUnCheckAll(object sender, RoutedEventArgs e)
{
 var chkSelectAll = sender as CheckBox;
 var firstCol = dgUsers.Columns.OfType&lt;DataGridCheckBoxColumn&gt;().FirstOrDefault(c =&gt; c.DisplayIndex == 0);
 if (chkSelectAll == null || firstCol == null || dgUsers?.Items == null)
 {
 return;
 }
 foreach (var item in dgUsers.Items)
 {
 var chBx = firstCol.GetCellContent(item) as CheckBox;
 if (chBx == null)
 {
 continue;
 }
 chBx.IsChecked = chkSelectAll.IsChecked;
 }
}
</code></pre>

blocks|key|2477662|text|TLDR;这就是你想要的，代码如下：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2477663|​|2477664|📷|atomic|2477665|2477666|执行此操作的适当位置应该在ViewModel中。您的CheckBox可以有三种状态，您希望使用所有这些状态：|2477667|选中项目-每个项目都是checked|2477668|Unchecked+-没有项目是checked|unordered-list-item|2477669|
|2477670|Indeterminate+-某些项目已选中，有些项目不是|2477671|ordered-list-item|2477672|2477673|2477674|您可能希望在选中/取消选中某个项目时更新CheckBox，并在更改CheckBox时更新所有项目-仅以一种方式实现此操作将使CheckBox处于无效状态，这可能会对用户体验产生负面影响。我的建议是:一路走下去，正确地实现它。要做到这一点，您需要知道是哪个引起了更改-条目的CheckBox还是头中的CheckBox。|2477675|下面是我会怎么做：|2477676|首先，您需要为您的项目提供一个ViewModel，我在这里使用了一个非常简单的只包含IsChecked属性的the。|CODE|2477677|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));
++++}
}|code-block|syntax|javascript|2477678|您的主ViewModel将拥有一个包含所有项的集合。每当项的IsChecked属性更改时，您必须检查是否选中/取消选中所有项，并更新标题中的CheckBox+(或者更确切地说，更新其数据源的值)。|2477679|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+%2B=+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));
++++}
}|2477680|演示XAML：|2477681|<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>|2477682|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/3d0d4f16bed183c5751a8d5092c34ac8.gif|imageAlt^0|0|5|0|0|0|1|0|0|0|0|0|0|0|0|0|0|0|0|0|16|9|0|0|U|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1T|8|@$9|1U|A|1V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1W|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1X|8|@]|D|@$9|1Y|A|1Z|1|20]]|E|$]]|$1|K|3|G|5|6|7|21|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|22|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|23|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|24|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|25|8|@]|D|@]|E|$]]|$1|U|3|V|5|R|7|26|8|@]|D|@]|E|$]]|$1|W|3|-4|5|X|7|27|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|28|8|@]|D|@]|E|$]]|$1|Z|3|-4|5|6|7|29|8|@]|D|@]|E|$]]|$1|10|3|11|5|6|7|2A|8|@]|D|@]|E|$]]|$1|12|3|13|5|6|7|2B|8|@]|D|@]|E|$]]|$1|14|3|15|5|6|7|2C|8|@$9|2D|A|2E|B|16]]|D|@]|E|$]]|$1|17|3|18|5|19|7|2F|8|@]|D|@]|E|$1A|1B]]|$1|1C|3|1D|5|6|7|2G|8|@$9|2H|A|2I|B|16]]|D|@]|E|$]]|$1|1E|3|1F|5|19|7|2J|8|@]|D|@]|E|$1A|1B]]|$1|1G|3|1H|5|6|7|2K|8|@]|D|@]|E|$]]|$1|1I|3|1J|5|19|7|2L|8|@]|D|@]|E|$1A|1B]]|$1|1K|3|-4|5|6|7|2M|8|@]|D|@]|E|$]]]|1L|$1M|$5|1N|1O|1P|E|$1Q|1R|1S|-4]]]]

TLDR; This is what you want, code below:

<a href="https://i.stack.imgur.com/NBsrv.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/NBsrv.gif" alt="Demo of what I&#39;m about to explain"></a>

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:

<ol>
<li>Checked - Every item is checked</li>
<li>Unchecked - No item is checked</li>
<li>Indeterminate - Some items are checked, some are not</li>
</ol>

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 <code>IsChecked</code> property.

<pre><code>public class Entry : INotifyPropertyChanged
{
 private bool _isChecked;

 public bool IsChecked
 {
 get =&gt; _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));
 }
}
</code></pre>

Your main ViewModel will have a collection of all items. Whenever an item's <code>IsChecked</code> 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).

<pre><code>public class ViewModel : INotifyPropertyChanged
{
 public List&lt;Entry&gt; Entries
 {
 get =&gt; _entries;
 set
 {
 if (Equals(value, _entries)) return;
 _entries = value;
 OnPropertyChanged();
 }
 }

 public ViewModel()
 {
 // Just some demo data
 Entries = new List&lt;Entry&gt;
 {
 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 =&gt; e.IsChecked))
 AllSelected = true;
 else if (Entries.All(e =&gt; !e.IsChecked))
 AllSelected = false;
 else
 AllSelected = null;
 }
 finally
 {
 _allSelectedChanging = false;
 }
 }

 public bool? AllSelected
 {
 get =&gt; _allSelected;
 set
 {
 if (value == _allSelected) return;
 _allSelected = value;

 // Set all other CheckBoxes
 AllSelectedChanged();
 OnPropertyChanged();
 }
 }

 private bool _allSelectedChanging;
 private List&lt;Entry&gt; _entries;
 private bool? _allSelected;
 public event PropertyChangedEventHandler PropertyChanged;

 [NotifyPropertyChangedInvocator]
 protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
 {
 PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
 }
}
</code></pre>

Demo XAML:

<pre class="lang-xaml prettyprint-override"><code>&lt;DataGrid ItemsSource="{Binding Entries}" AutoGenerateColumns="False" IsReadOnly="False" CanUserAddRows="False"&gt;
 &lt;DataGrid.Columns&gt;
 &lt;DataGridCheckBoxColumn Binding="{Binding IsChecked, UpdateSourceTrigger=PropertyChanged}"&gt;
 &lt;DataGridCheckBoxColumn.HeaderTemplate&gt;
 &lt;DataTemplate&gt;
 &lt;CheckBox IsChecked="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:MainWindow}, Path=ViewModel.AllSelected}"&gt;Select All&lt;/CheckBox&gt;
 &lt;/DataTemplate&gt;
 &lt;/DataGridCheckBoxColumn.HeaderTemplate&gt;
 &lt;/DataGridCheckBoxColumn&gt;
 &lt;/DataGrid.Columns&gt;
&lt;/DataGrid&gt;
</code></pre>

blocks|key|22843|text|这是基于@Manfred的solution的修改。我使用Command而不是event。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|22844|XAML：|22845|<DataGrid+ItemsSource="{Binding+Students}"+AutoGenerateColumns="True"+CanUserAddRows="False">
++++<DataGrid.Columns>
++++++++<DataGridTemplateColumn>
++++++++++++<DataGridTemplateColumn.HeaderTemplate>
++++++++++++++++<DataTemplate>
++++++++++++++++++++<CheckBox+IsChecked="{Binding+DataContext.IsAllSelected,+RelativeSource={RelativeSource+AncestorType=DataGrid}}"+Command="{Binding+DataContext.CheckAllStudentsCommand,+RelativeSource={RelativeSource+AncestorType=DataGrid}}"+/>
++++++++++++++++</DataTemplate>
++++++++++++</DataGridTemplateColumn.HeaderTemplate>
++++++++++++<DataGridTemplateColumn.CellTemplate>
++++++++++++++++<DataTemplate>
++++++++++++++++++++<CheckBox+IsChecked="{Binding+IsChecked,+UpdateSourceTrigger=PropertyChanged}"+Command="{Binding+DataContext.CheckStudentCommand,+RelativeSource={RelativeSource+AncestorType=DataGrid}}"+/>
++++++++++++++++</DataTemplate>
++++++++++++</DataGridTemplateColumn.CellTemplate>
++++++++</DataGridTemplateColumn>
++++</DataGrid.Columns>
</DataGrid>|code-block|syntax|javascript|22846|ViewModel：|22847|public+class+MainWindowViewModel+:+INotifyPropertyChanged
{
++++private+List<Student>+students;

++++public+List<Student>+Students
++++{
++++++++get+{+return+students;+}
++++++++set+{+students+=+value;+OnPropertyChanged();+}
++++}

++++private+bool?+isAllSelected;

++++public+bool?+IsAllSelected
++++{
++++++++get+{+return+isAllSelected;+}
++++++++set+{+isAllSelected+=+value;+OnPropertyChanged();+}
++++}

++++public+RelayCommand+CheckStudentCommand+{+get;+private+set;+}
++++public+RelayCommand+CheckAllStudentsCommand+{+get;+private+set;+}

++++public+MainWindowViewModel()
++++{
++++++++Students+=+new+List<Student>()+{+new+Student+{+Name+=+"Walter"+},+new+Student+{+Name+=+"Jenny"+},+new+Student+{+Name+=+"Joe"+}+};
++++++++CheckStudentCommand+=+new+RelayCommand(OnCheckStudent);
++++++++CheckAllStudentsCommand+=+new+RelayCommand(OnCheckAllStudents);
++++++++IsAllSelected+=+false;
++++}

++++private+void+OnCheckAllStudents()
++++{
++++++++if+(IsAllSelected+==+true)
++++++++++++Students.ForEach(x+=>+x.IsChecked+=+true);
++++++++else
++++++++++++Students.ForEach(x+=>+x.IsChecked+=+false);
++++}

++++private+void+OnCheckStudent()
++++{
++++++++if+(Students.All(x+=>+x.IsChecked))
++++++++++++IsAllSelected+=+true;
++++++++else+if+(Students.All(x+=>+!x.IsChecked))
++++++++++++IsAllSelected+=+false;
++++++++else
++++++++++++IsAllSelected+=+null;
++++}

++++public+event+PropertyChangedEventHandler+PropertyChanged;

++++protected+virtual+void+OnPropertyChanged([CallerMemberName]+string+propertyName+=+null)
++++{
++++++++PropertyChanged?.Invoke(this,+new+PropertyChangedEventArgs(propertyName));
++++}
}|22848|源代码可在here上找到|22849|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/48990131/823247|1|https://walterhuang.visualstudio.com/_git/TryDataGridCheckbox^0|S|7|12|5|D|8|0|0|0|0|0|0|5|4|1|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1C|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1D|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1E|8|@]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|S|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]|10|$5|V|W|X|E|$Y|11]]]]

This is a modification based on @Manfred's <a href="https://stackoverflow.com/a/48990131/823247">solution</a>. I use <code>Command</code> instead of <code>event</code>.

XAML:

<pre><code>&lt;DataGrid ItemsSource="{Binding Students}" AutoGenerateColumns="True" CanUserAddRows="False"&gt;
 &lt;DataGrid.Columns&gt;
 &lt;DataGridTemplateColumn&gt;
 &lt;DataGridTemplateColumn.HeaderTemplate&gt;
 &lt;DataTemplate&gt;
 &lt;CheckBox IsChecked="{Binding DataContext.IsAllSelected, RelativeSource={RelativeSource AncestorType=DataGrid}}" Command="{Binding DataContext.CheckAllStudentsCommand, RelativeSource={RelativeSource AncestorType=DataGrid}}" /&gt;
 &lt;/DataTemplate&gt;
 &lt;/DataGridTemplateColumn.HeaderTemplate&gt;
 &lt;DataGridTemplateColumn.CellTemplate&gt;
 &lt;DataTemplate&gt;
 &lt;CheckBox IsChecked="{Binding IsChecked, UpdateSourceTrigger=PropertyChanged}" Command="{Binding DataContext.CheckStudentCommand, RelativeSource={RelativeSource AncestorType=DataGrid}}" /&gt;
 &lt;/DataTemplate&gt;
 &lt;/DataGridTemplateColumn.CellTemplate&gt;
 &lt;/DataGridTemplateColumn&gt;
 &lt;/DataGrid.Columns&gt;
&lt;/DataGrid&gt;
</code></pre>

ViewModel:

<pre><code>public class MainWindowViewModel : INotifyPropertyChanged
{
 private List&lt;Student&gt; students;

 public List&lt;Student&gt; Students
 {
 get { return students; }
 set { students = value; OnPropertyChanged(); }
 }

 private bool? isAllSelected;

 public bool? IsAllSelected
 {
 get { return isAllSelected; }
 set { isAllSelected = value; OnPropertyChanged(); }
 }

 public RelayCommand CheckStudentCommand { get; private set; }
 public RelayCommand CheckAllStudentsCommand { get; private set; }

 public MainWindowViewModel()
 {
 Students = new List&lt;Student&gt;() { new Student { Name = "Walter" }, new Student { Name = "Jenny" }, new Student { Name = "Joe" } };
 CheckStudentCommand = new RelayCommand(OnCheckStudent);
 CheckAllStudentsCommand = new RelayCommand(OnCheckAllStudents);
 IsAllSelected = false;
 }

 private void OnCheckAllStudents()
 {
 if (IsAllSelected == true)
 Students.ForEach(x =&gt; x.IsChecked = true);
 else
 Students.ForEach(x =&gt; x.IsChecked = false);
 }

 private void OnCheckStudent()
 {
 if (Students.All(x =&gt; x.IsChecked))
 IsAllSelected = true;
 else if (Students.All(x =&gt; !x.IsChecked))
 IsAllSelected = false;
 else
 IsAllSelected = null;
 }

 public event PropertyChangedEventHandler PropertyChanged;

 protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
 {
 PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
 }
}
</code></pre>

Source code is available <a href="https://walterhuang.visualstudio.com/_git/TryDataGridCheckbox" rel="nofollow noreferrer">here</a>

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

<pre><code>private void CheckUnCheckAll(object sender, RoutedEventArgs e)
{
 CheckBox chkSelectAll = ((CheckBox)sender);
 if (chkSelectAll.IsChecked == true)
 {
 dgUsers.Items.OfType&lt;CheckBox&gt;().ToList().ForEach(x =&gt; x.IsChecked = true);
 }
 else
 {
 dgUsers.Items.OfType&lt;CheckBox&gt;().ToList().ForEach(x =&gt; x.IsChecked = false);
 }
}
</code></pre>

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

<pre><code>&lt;DataGrid.Columns&gt;
 &lt;DataGridCheckBoxColumn x:Name="col0" HeaderStyle="{StaticResource ColumnHeaderGripperStyle}"&gt;
 &lt;DataGridCheckBoxColumn.HeaderTemplate&gt;
 &lt;DataTemplate&gt;
 &lt;CheckBox Click="CheckUnCheckAll" &gt;
 &lt;/CheckBox&gt;
 &lt;/DataTemplate&gt;
 &lt;/DataGridCheckBoxColumn.HeaderTemplate&gt;
 &lt;/DataGridCheckBoxColumn&gt;
&lt;DataGrid.Columns&gt;
</code></pre>

And this is the picture of my DataGrid

<a href="https://i.stack.imgur.com/4eEjU.png" rel="noreferrer"><img src="https://i.stack.imgur.com/4eEjU.png" alt="enter image description here"></a>

Is there some way to select all checkbox programatically ?

Edit
I already tried to follow <a href="https://stackoverflow.com/questions/10208004/datagrid-column-header-should-check-uncheck-checkbox-s-state-depending-upon-wh">this steps</a>

that you can see that my code is the same there but didn't work to me

WPF Select all CheckBox in a DataGrid

我正在尝试选择DataGrid中的所有CheckBox，但是使用下面的代码没有得到任何结果这是单击主CheckBox时我要调用的函数private void CheckUnCheckAll(object sender, RoutedEventArgs e){    CheckBox chkSelectAll = ((C...

问WPF选择DataGrid中的所有CheckBox
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