blocks|key|1529418|text|您可以递归地迭代所有控件树，并检查附加的属性Validation.HasErrorProperty，然后专注于您在其中找到的第一个属性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1529419|您还可以使用许多已经编写的解决方案，您可以查看this线程中的示例和更多信息|offset|length|1529420|entityMap|0|LINK|mutability|MUTABLE|url|http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/e7a0ae3b-75f3-4090-8bbc-51eaa841867e/^0|0|N|4|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

You can iterate over all your controls tree recursively and check the attached property Validation.HasErrorProperty, then focus on the first one you find in it.

you can also use many already-written solutions
you can check <a href="http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/e7a0ae3b-75f3-4090-8bbc-51eaa841867e/" rel="nofollow noreferrer">this</a> thread for an example and more information

blocks|key|1744436|text|下面的代码(摘自Chris+Sell和Ian+Griffiths的Programming+WPF一书)验证了依赖对象及其子对象上的所有绑定规则：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1744437|public+static+class+Validator
{

++++public+static+bool+IsValid(DependencyObject+parent)
++++{
++++++++//+Validate+all+the+bindings+on+the+parent
++++++++bool+valid+=+true;
++++++++LocalValueEnumerator+localValues+=+parent.GetLocalValueEnumerator();
++++++++while+(localValues.MoveNext())
++++++++{
++++++++++++LocalValueEntry+entry+=+localValues.Current;
++++++++++++if+(BindingOperations.IsDataBound(parent,+entry.Property))
++++++++++++{
++++++++++++++++Binding+binding+=+BindingOperations.GetBinding(parent,+entry.Property);
++++++++++++++++foreach+(ValidationRule+rule+in+binding.ValidationRules)
++++++++++++++++{
++++++++++++++++++++ValidationResult+result+=+rule.Validate(parent.GetValue(entry.Property),+null);
++++++++++++++++++++if+(!result.IsValid)
++++++++++++++++++++{
++++++++++++++++++++++++BindingExpression+expression+=+BindingOperations.GetBindingExpression(parent,+entry.Property);
++++++++++++++++++++++++System.Windows.Controls.Validation.MarkInvalid(expression,+new+ValidationError(rule,+expression,+result.ErrorContent,+null));
++++++++++++++++++++++++valid+=+false;
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
++++++++}

++++++++//+Validate+all+the+bindings+on+the+children
++++++++for+(int+i+=+0;+i+!=+VisualTreeHelper.GetChildrenCount(parent);+%2B%2Bi)
++++++++{
++++++++++++DependencyObject+child+=+VisualTreeHelper.GetChild(parent,+i);
++++++++++++if+(!IsValid(child))+{+valid+=+false;+}
++++++++}

++++++++return+valid;
++++}

}|code-block|syntax|javascript|1744438|您可以在保存按钮单击事件处理程序中调用此函数，如下所示|1744439|private+void+saveButton_Click(object+sender,+RoutedEventArgs+e)
{

++if+(Validator.IsValid(this))+//+is+valid
+++{

++++....
+++}
}|1744440|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The following code (from Programming WPF book by Chris Sell &amp; Ian Griffiths) validates all binding rules on a dependency object and its children:

<pre><code>public static class Validator
{

 public static bool IsValid(DependencyObject parent)
 {
 // Validate all the bindings on the parent
 bool valid = true;
 LocalValueEnumerator localValues = parent.GetLocalValueEnumerator();
 while (localValues.MoveNext())
 {
 LocalValueEntry entry = localValues.Current;
 if (BindingOperations.IsDataBound(parent, entry.Property))
 {
 Binding binding = BindingOperations.GetBinding(parent, entry.Property);
 foreach (ValidationRule rule in binding.ValidationRules)
 {
 ValidationResult result = rule.Validate(parent.GetValue(entry.Property), null);
 if (!result.IsValid)
 {
 BindingExpression expression = BindingOperations.GetBindingExpression(parent, entry.Property);
 System.Windows.Controls.Validation.MarkInvalid(expression, new ValidationError(rule, expression, result.ErrorContent, null));
 valid = false;
 }
 }
 }
 }

 // Validate all the bindings on the children
 for (int i = 0; i != VisualTreeHelper.GetChildrenCount(parent); ++i)
 {
 DependencyObject child = VisualTreeHelper.GetChild(parent, i);
 if (!IsValid(child)) { valid = false; }
 }

 return valid;
 }

}
</code></pre>

You can call this in your save button click event handler like this in your page/window 

<pre><code>private void saveButton_Click(object sender, RoutedEventArgs e)
{

 if (Validator.IsValid(this)) // is valid
 {

 ....
 }
}
</code></pre>

blocks|key|1744495|text|在使用ListBox时，发布的代码对我不起作用。我重写了它，现在它可以工作了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1744496|public+static+bool+IsValid(DependencyObject+parent)
{
++++if+(Validation.GetHasError(parent))
++++++++return+false;

++++//+Validate+all+the+bindings+on+the+children
++++for+(int+i+=+0;+i+!=+VisualTreeHelper.GetChildrenCount(parent);+%2B%2Bi)
++++{
++++++++DependencyObject+child+=+VisualTreeHelper.GetChild(parent,+i);
++++++++if+(!IsValid(child))+{+return+false;+}
++++}

++++return+true;
}|code-block|syntax|javascript|1744497|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The posted code did not work for me when using a ListBox. I rewrote it and now it works:

<pre><code>public static bool IsValid(DependencyObject parent)
{
 if (Validation.GetHasError(parent))
 return false;

 // Validate all the bindings on the children
 for (int i = 0; i != VisualTreeHelper.GetChildrenCount(parent); ++i)
 {
 DependencyObject child = VisualTreeHelper.GetChild(parent, i);
 if (!IsValid(child)) { return false; }
 }

 return true;
}
</code></pre>

blocks|key|1529583|text|在answer+form+aogan中，最好调用expression.UpdateSource():，而不是显式地遍历验证规则|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1529584|if+(BindingOperations.IsDataBound(parent,+entry.Property))
{
++++Binding+binding+=+BindingOperations.GetBinding(parent,+entry.Property);
++++if+(binding.ValidationRules.Count+>+0)
++++{
++++++++BindingExpression+expression+
++++++++++++=+BindingOperations.GetBindingExpression(parent,+entry.Property);
++++++++expression.UpdateSource();

++++++++if+(expression.HasError)+valid+=+false;
++++}
}|code-block|syntax|javascript|1529585|entityMap^0|O|Q|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

In answer form aogan, instead of explicitly iterate through validation rules, better just invoke <code>expression.UpdateSource():</code>

<pre><code>if (BindingOperations.IsDataBound(parent, entry.Property))
{
 Binding binding = BindingOperations.GetBinding(parent, entry.Property);
 if (binding.ValidationRules.Count &gt; 0)
 {
 BindingExpression expression 
 = BindingOperations.GetBindingExpression(parent, entry.Property);
 expression.UpdateSource();

 if (expression.HasError) valid = false;
 }
}
</code></pre>

blocks|key|1529687|text|有相同的问题，并尝试了提供的解决方案。H-man2和skiba_k的解决方案的组合对我来说几乎没问题，只有一个例外:我的窗口有一个TabControl。并且验证规则仅针对当前可见的TabItem进行评估。所以我用LogicalTreeHelper代替了VisualTreeHelper。现在它起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1529688|++++public+static+bool+IsValid(DependencyObject+parent)
++++{
++++++++//+Validate+all+the+bindings+on+the+parent
++++++++bool+valid+=+true;
++++++++LocalValueEnumerator+localValues+=+parent.GetLocalValueEnumerator();
++++++++while+(localValues.MoveNext())
++++++++{
++++++++++++LocalValueEntry+entry+=+localValues.Current;
++++++++++++if+(BindingOperations.IsDataBound(parent,+entry.Property))
++++++++++++{
++++++++++++++++Binding+binding+=+BindingOperations.GetBinding(parent,+entry.Property);
++++++++++++++++if+(binding.ValidationRules.Count+>+0)
++++++++++++++++{
++++++++++++++++++++BindingExpression+expression+=+BindingOperations.GetBindingExpression(parent,+entry.Property);
++++++++++++++++++++expression.UpdateSource();

++++++++++++++++++++if+(expression.HasError)
++++++++++++++++++++{
++++++++++++++++++++++++valid+=+false;
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
++++++++}

++++++++//+Validate+all+the+bindings+on+the+children
++++++++System.Collections.IEnumerable+children+=+LogicalTreeHelper.GetChildren(parent);
++++++++foreach+(object+obj+in+children)
++++++++{
++++++++++++if+(obj+is+DependencyObject)
++++++++++++{
++++++++++++++++DependencyObject+child+=+(DependencyObject)obj;
++++++++++++++++if+(!IsValid(child))+{+valid+=+false;+}
++++++++++++}
++++++++}
++++++++return+valid;
++++}|code-block|syntax|javascript|1529689|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Had the same problem and tried the provided solutions. A combination of H-Man2's and skiba_k's solutions worked almost fine for me, for one exception: My Window has a TabControl. And the validation rules only get evaluated for the TabItem that is currently visible. So I replaced VisualTreeHelper by LogicalTreeHelper. Now it works.

<pre><code> public static bool IsValid(DependencyObject parent)
 {
 // Validate all the bindings on the parent
 bool valid = true;
 LocalValueEnumerator localValues = parent.GetLocalValueEnumerator();
 while (localValues.MoveNext())
 {
 LocalValueEntry entry = localValues.Current;
 if (BindingOperations.IsDataBound(parent, entry.Property))
 {
 Binding binding = BindingOperations.GetBinding(parent, entry.Property);
 if (binding.ValidationRules.Count &gt; 0)
 {
 BindingExpression expression = BindingOperations.GetBindingExpression(parent, entry.Property);
 expression.UpdateSource();

 if (expression.HasError)
 {
 valid = false;
 }
 }
 }
 }

 // Validate all the bindings on the children
 System.Collections.IEnumerable children = LogicalTreeHelper.GetChildren(parent);
 foreach (object obj in children)
 {
 if (obj is DependencyObject)
 {
 DependencyObject child = (DependencyObject)obj;
 if (!IsValid(child)) { valid = false; }
 }
 }
 return valid;
 }
</code></pre>

blocks|key|1529708|text|我会提供一个小的优化。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1529709|如果您对相同的控件多次执行此操作，则可以添加上述代码以保留实际具有验证规则的控件的列表。然后，当您需要检查有效性时，只检查这些控件，而不是整个可视化树。如果您有许多这样的控件，这将被证明是更好的。|1529710|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I would offer a small optimization.

If you do this many times over the same controls, you can add the above code to keep a list of controls that actually have validation rules. Then whenever you need to check for validity, only go over those controls, instead of the whole visual tree.
This would prove to be much better if you have many such controls.

blocks|key|1744677|text|这篇文章非常有帮助。感谢所有做出贡献的人。这是一个你会喜欢或讨厌的LINQ版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1744678|private+void+CanExecute(object+sender,+CanExecuteRoutedEventArgs+e)
{
++++e.CanExecute+=+IsValid(sender+as+DependencyObject);
}

private+bool+IsValid(DependencyObject+obj)
{
++++//+The+dependency+object+is+valid+if+it+has+no+errors+and+all
++++//+of+its+children+(that+are+dependency+objects)+are+error-free.
++++return+!Validation.GetHasError(obj)+&&
++++LogicalTreeHelper.GetChildren(obj)
++++.OfType<DependencyObject>()
++++.All(IsValid);
}|code-block|syntax|javascript|1744679|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This post was extremely helpful. Thanks to all who contributed. Here is a LINQ version that you will either love or hate.

<pre><code>private void CanExecute(object sender, CanExecuteRoutedEventArgs e)
{
 e.CanExecute = IsValid(sender as DependencyObject);
}

private bool IsValid(DependencyObject obj)
{
 // The dependency object is valid if it has no errors and all
 // of its children (that are dependency objects) are error-free.
 return !Validation.GetHasError(obj) &amp;&amp;
 LogicalTreeHelper.GetChildren(obj)
 .OfType&lt;DependencyObject&gt;()
 .All(IsValid);
}
</code></pre>

blocks|key|1529826|text|除了Dean的强大LINQ实现之外，我还很享受将代码封装到DependencyObjects扩展中的乐趣：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1529827|public+static+bool+IsValid(this+DependencyObject+instance)
{
+++//+Validate+recursivly
+++return+!Validation.GetHasError(instance)+&&++LogicalTreeHelper.GetChildren(instance).OfType<DependencyObject>().All(child+=>+child.IsValid());
}|code-block|syntax|javascript|1529828|考虑到可重用性，这使得它变得非常好。|1529829|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In addition to the great LINQ-implementation of Dean, I had fun wrapping the code into an extension for DependencyObjects:

<pre><code>public static bool IsValid(this DependencyObject instance)
{
 // Validate recursivly
 return !Validation.GetHasError(instance) &amp;&amp; LogicalTreeHelper.GetChildren(instance).OfType&lt;DependencyObject&gt;().All(child =&gt; child.IsValid());
}
</code></pre>

This makes it extremely nice considering reuseablity.

blocks|key|1529850|text|这是一个用于在WPF中进行表单验证的library。Nuget+package+here。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1529851|示例：|1529852|<Border+BorderBrush="{Binding+Path=(validationScope:Scope.HasErrors),
++++++++++++++++++++++++++++++Converter={local:BoolToBrushConverter},
++++++++++++++++++++++++++++++ElementName=Form}"
++++++++BorderThickness="1">
++++<StackPanel+x:Name="Form"+validationScope:Scope.ForInputTypes="{x:Static+validationScope:InputTypeCollection.Default}">
++++++++<TextBox+Text="{Binding+SomeProperty}"+/>
++++++++<TextBox+Text="{Binding+SomeOtherProperty}"+/>
++++</StackPanel>
</Border>|code-block|syntax|javascript|1529853|我们的想法是，我们通过附加的属性定义一个验证范围，告诉它要跟踪哪些输入控件。然后我们可以这样做：|1529854|<ItemsControl+ItemsSource="{Binding+Path=(validationScope:Scope.Errors),
++++++++++++++++++++++++++++++++++++ElementName=Form}">
++++<ItemsControl.ItemTemplate>
++++++++<DataTemplate+DataType="{x:Type+ValidationError}">
++++++++++++<TextBlock+Foreground="Red"
+++++++++++++++++++++++Text="{Binding+ErrorContent}"+/>
++++++++</DataTemplate>
++++</ItemsControl.ItemTemplate>
</ItemsControl>|1529855|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/JohanLarsson/Gu.Wpf.ValidationScope|1|https://www.nuget.org/packages/Gu.Wpf.ValidationScope^0|I|7|0|Q|I|1|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]|$A|12|B|13|1|14]]|C|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|16|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|17|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|18|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]|W|$5|R|S|T|C|$U|X]]]]

Here is a <a href="https://github.com/JohanLarsson/Gu.Wpf.ValidationScope" rel="nofollow">library</a> for form validation in WPF. <a href="https://www.nuget.org/packages/Gu.Wpf.ValidationScope" rel="nofollow">Nuget package here</a>.

Sample:

<pre><code>&lt;Border BorderBrush="{Binding Path=(validationScope:Scope.HasErrors),
 Converter={local:BoolToBrushConverter},
 ElementName=Form}"
 BorderThickness="1"&gt;
 &lt;StackPanel x:Name="Form" validationScope:Scope.ForInputTypes="{x:Static validationScope:InputTypeCollection.Default}"&gt;
 &lt;TextBox Text="{Binding SomeProperty}" /&gt;
 &lt;TextBox Text="{Binding SomeOtherProperty}" /&gt;
 &lt;/StackPanel&gt;
&lt;/Border&gt;
</code></pre>

The idea is that we define a validation scope via the attached property telling it what input controls to track.
Then we can do:

<pre><code>&lt;ItemsControl ItemsSource="{Binding Path=(validationScope:Scope.Errors),
 ElementName=Form}"&gt;
 &lt;ItemsControl.ItemTemplate&gt;
 &lt;DataTemplate DataType="{x:Type ValidationError}"&gt;
 &lt;TextBlock Foreground="Red"
 Text="{Binding ErrorContent}" /&gt;
 &lt;/DataTemplate&gt;
 &lt;/ItemsControl.ItemTemplate&gt;
&lt;/ItemsControl&gt;
</code></pre>

In WPF you can setup validation based on errors thrown in your Data Layer during Data Binding using the <code>ExceptionValidationRule</code> or <code>DataErrorValidationRule</code>.

Suppose you had a bunch of controls set up this way and you had a Save button. When the user clicks the Save button, you need to make sure there are no validation errors before proceeding with the save. If there are validation errors, you want to holler at them.

In WPF, how do you find out if any of your Data Bound controls have validation errors set?

Detecting WPF Validation Errors

Windows

在WPF中，您可以使用ExceptionValidationRule或DataErrorValidationRule根据在数据绑定期间在数据层中引发的错误来设置验证。假设你有一堆这样设置的控件，并且你有一个Save按钮。当用户单击save按钮时，您需要确保在继续保存之前没有验证错误。如果存在验证错误，您需要对其进行处理...

问正在检测WPF验证错误
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