WPF TextBox.SelectAll（）不起作用

I have used the following template in my project:

我在我的项目中使用了以下模板：

<DataTemplate 
    x:Key="textBoxDataTemplate">
    <TextBox 
        Name="textBox"
        ToolTip="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}"
        Tag="{Binding}"
        PreviewKeyDown="cellValueTextBoxKeyDown">
        <TextBox.Text>
            <MultiBinding
                Converter="{StaticResource intToStringMultiConverter}">
                <Binding 
                    Path="CellValue"
                    Mode="TwoWay">
                        <Binding.ValidationRules>
                            <y:MatrixCellValueRule 
                                MaxValue="200" />
                        </Binding.ValidationRules>
                </Binding>
                <Binding 
                    RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type y:MatrixGrid}}" 
                    Path="Tag"
                    Mode="OneWay" />
            </MultiBinding>
        </TextBox.Text>
    </TextBox>
</DataTemplate>

I used this template to create an editable matrix for the user. The user is able to navigate from cell to cell within the matrix and I would like to highlight the data in the selected textbox but it doesn't work. I called TextBox.Focus () and TextBox.SelectAll () to achieve the effect but nothing. The Focus () works but the text never gets highlighted.

我使用此模板为用户创建可编辑的矩阵。用户能够在矩阵内从一个单元格导航到另一个单元格，我想突出显示所选文本框中的数据，但它不起作用。我调用TextBox.Focus（）和TextBox.SelectAll（）来实现效果，但没有。 Focus（）有效，但文本永远不会突出显示。

Any help is welcome and appreciated.

欢迎任何帮助和赞赏。

3 个解决方案

#1

Okay, if anyone is interested, the solution to this problem of mine was to include the statement e.Handled = true; in the event handler method where the textBox.SelectAll() and textBox.Focus() are called.

好吧，如果有人感兴趣，我的这个问题的解决方案是包括声明e.Handled = true;在事件处理程序方法中调用textBox.SelectAll（）和textBox.Focus（）。

The problem was that I attached an event handler to the textbox's PreviewKeyDown event which handles a tunneling event and probably the SelectAll() and Focus() calls are ignored without calling the e.Handled = true; statement.

问题是我将一个事件处理程序附加到文本框的PreviewKeyDown事件，该事件处理隧道事件，并且可能忽略SelectAll（）和Focus（）调用而不调用e.Handled = true;声明。

Hope it'll help someone.

希望它能帮助别人。

#2

Without the rest of your code it's difficult to say whether this will work for you, but I put together a small sample using your DataTemplate (minus the parts that refer to code that wasn't posted).

如果没有其余的代码，很难说这是否适合您，但我使用您的DataTemplate汇总了一个小样本（减去引用未发布的代码的部分）。

I was able to select all the text in the text boxes by adding a GotFocus event handler to the TextBox in the DataTemplate:

我可以通过向DataTemplate中的TextBox添加GotFocus事件处理程序来选择文本框中的所有文本：

<TextBox 
    ...
    GotFocus="textBox_GotFocus"
    ...>
...
</TextBox>

And the code-behind:

代码隐藏：

    private void textBox_GotFocus(object sender, RoutedEventArgs e)
    {
        TextBox textBox = sender as TextBox;
        if (textBox != null)
        {
            textBox.SelectAll();
        }
    }

Let me know if you are attempting to select all under different circumstances (not when the box receives focus).

如果您尝试在不同情况下选择所有情况（请勿在框中获得焦点时），请告诉我。

#3

-1

Here's a very good very simple solution (I don't know if it works for your template, but give it a try): http://social.msdn.microsoft.com/forums/en-US/wpf/thread/564b5731-af8a-49bf-b297-6d179615819f

这是一个非常好的非常简单的解决方案（我不知道它是否适用于您的模板，但试一试）：http：//social.msdn.microsoft.com/forums/en-US/wpf/thread/564b5731 -af8a-49bf-b297-6d179615819f

#1