DataGrid中的DataGridTextColumn CharacterCasing [英] DataGridTextColumn CharacterCasing in DataGrid

问题描述

我试图获得一个 DataGridTextColumn ，只允许上套。

I'm trying to get a DataGridTextColumn to only allow upper casing.

明显的做法是将 CharacterCasing 设置为 EditingElementStyle TextBox 。只要您在开始输入之前输入编辑模式，但是如果您在单元格不处于编辑模式时开始输入，则在 TextBox 中输入的第一个字符就是小写（之后，当单元格进入编辑模式时，一切都按预期工作）

The obvious approach would be to set CharacterCasing to Upper for the EditingElementStyle TextBox. 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).

我有一种感觉这是一个错误或者我错过了一些假设，即将 CharacterCasing 设置为上层应该做的伎俩？有人有这个修复或解决方法吗？

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? Does anybody have a fix or workaround for this?

问题可以这样转载。只需将键盘焦点放在 DataGrid 中的第一个单元格中，然后按 a ，而不要先输入编辑模式。看起来像这样

The problem can be reproduced like this. Just put the keyboard focus in the first cell in the DataGrid and press a without entering edit mode first. Looks like this

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

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; }
}

推荐答案

这是一个错误，我使用附加行为创建了一个解决方法。而不是设置 CharacterCasing =Upper，我使用行为：TextBoxUpperCaseBehavior.IsEnabled =True。

I'm pretty sure this is a bug and I created a workaround using an Attached Behavior. Instead of setting CharacterCasing="Upper", I use behaviors:TextBoxUpperCaseBehavior.IsEnabled="True".

<Style TargetType="TextBox" x:Key="dataGridUpperCaseTextBoxStyle">
    <Setter Property="behaviors:TextBoxUpperCaseBehavior.IsEnabled" Value="True"/>
</Style>

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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