[英]DataGridTextColumn CharacterCasing in DataGrid
I'm trying to get a DataGridTextColumn
to only allow upper casing. 我试图让DataGridTextColumn
只允许上壳。
The obvious approach would be to set CharacterCasing
to Upper
for the EditingElementStyle
TextBox
. 显而易见的方法是为EditingElementStyle
TextBox
将CharacterCasing
设置为Upper
。 This works great as long as you enter edit mode before starting to type but if you start typing when the cell isn't in edit mode then the first character entered in the TextBox
is lower case (after this, when the cell has entered edit mode, everything works as expected). 只要在开始键入之前进入编辑模式,此方法就很好用,但是如果您在单元格不在编辑模式下开始输入时,则在TextBox
输入的第一个字符是小写字母(此后,当单元格进入编辑模式时) ,一切都按预期工作)。
I have a feeling this is a bug or am I missing something with the assumption that setting CharacterCasing
to Upper
should do the trick? 我有一种感觉这是一个错误,或者我错过了一些假设将CharacterCasing
设置为Upper
应该可以解决的问题? Does anybody have a fix or workaround for this? 有没有人为此修复或解决?
The problem can be reproduced like this. 可以这样重现该问题。 Just put the keyboard focus in the first cell in the DataGrid
and press a without entering edit mode first. 只需将键盘焦点放在DataGrid
的第一个单元格中,然后按一下即可进入编辑模式。 Looks like this 看起来像这样
MainWindow.xaml MainWindow.xaml
<DataGrid ItemsSource="{Binding MyList}"
AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Test Character Casing"
Binding="{Binding Name}">
<DataGridTextColumn.EditingElementStyle>
<Style TargetType="TextBox">
<Setter Property="CharacterCasing" Value="Upper"/>
</Style>
</DataGridTextColumn.EditingElementStyle>
</DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
MainWindow.xaml.cs MainWindow.xaml.cs
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
MyList = new List<MyItem>();
MyList.Add(new MyItem { Name = "" });
MyList.Add(new MyItem { Name = "" });
this.DataContext = this;
}
public List<MyItem> MyList { get; set; }
}
public class MyItem
{
public string Name { get; set; }
}
I'm pretty sure this is a bug and I created a workaround using an Attached Behavior. 我很确定这是一个错误,我使用附加行为创建了一个解决方法。 Instead of setting CharacterCasing="Upper"
, I use behaviors:TextBoxUpperCaseBehavior.IsEnabled="True"
. 我没有设置CharacterCasing="Upper"
,而是使用behaviors:TextBoxUpperCaseBehavior.IsEnabled="True"
。
<Style TargetType="TextBox" x:Key="dataGridUpperCaseTextBoxStyle">
<Setter Property="behaviors:TextBoxUpperCaseBehavior.IsEnabled" Value="True"/>
</Style>
TextBoxUpperCaseBehavior TextBoxUpperCaseBehavior
public static class TextBoxUpperCaseBehavior
{
public static readonly DependencyProperty IsEnabledProperty =
DependencyProperty.RegisterAttached("IsEnabled",
typeof(bool),
typeof(TextBoxUpperCaseBehavior),
new UIPropertyMetadata(false, OnIsEnabledChanged));
[AttachedPropertyBrowsableForType(typeof(TextBox))]
public static bool GetIsEnabled(TextBox comboBox)
{
return (bool)comboBox.GetValue(IsEnabledProperty);
}
public static void SetIsEnabled(TextBox comboBox, bool value)
{
comboBox.SetValue(IsEnabledProperty, value);
}
private static void OnIsEnabledChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
{
TextBox textBox = target as TextBox;
if ((bool)e.NewValue == true)
{
textBox.CharacterCasing = CharacterCasing.Upper;
textBox.TextChanged += textBox_TextChanged;
}
else
{
textBox.CharacterCasing = CharacterCasing.Normal;
textBox.TextChanged -= textBox_TextChanged;
}
}
private static void textBox_TextChanged(object sender, TextChangedEventArgs e)
{
TextBox textBox = sender as TextBox;
if (textBox.Text.ToUpper() != textBox.Text)
{
textBox.Text = textBox.Text.ToUpper();
}
}
}
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