wpf datagrid：在wpf中创建一个DatagridNumericColumn [英] wpf datagrid : create a DatagridNumericColumn in wpf

问题描述

我有一个要求，当用户输入数字以外的其他内容来处理文本框时，我想创建一个仅接受数字值（整数）的datagridcolumn。
我尝试了很多网页，对此感到厌倦，非常感谢任何人的帮助。

I have a requirement that I want to make a datagridcolumn which only accepts numeric values(integer) ,when the user enter something other than numbers handle the textbox . I tried a lot of webpages ,Iam tired of these ,I greately appreciate anybody have the helping mind.

推荐答案

根据@nit的建议，您可以创建从 DataGridTextColumn 派生的自己的类，如下所示：

Based on @nit suggestion, you can create your own class derived from DataGridTextColumn like this:

public class DataGridNumericColumn : DataGridTextColumn
{
    protected override object PrepareCellForEdit(System.Windows.FrameworkElement editingElement, System.Windows.RoutedEventArgs editingEventArgs)
    {
        TextBox edit = editingElement as TextBox;
        edit.PreviewTextInput += OnPreviewTextInput;

        return base.PrepareCellForEdit(editingElement, editingEventArgs);
    }

    void OnPreviewTextInput(object sender, System.Windows.Input.TextCompositionEventArgs e)
    {
        try
        {
            Convert.ToInt32(e.Text);
        }
        catch
        {
            // Show some kind of error message if you want

            // Set handled to true
            e.Handled = true;
        }
    }
}

在PrepareCellForEdit 方法，您注册了 OnPreviewTextInput 方法编辑 TextBox PreviewTextInput 事件，您可以在其中验证数值。

In the PrepareCellForEdit method you register the OnPreviewTextInput method to the editing TextBox PreviewTextInput event, where you validate for numeric values.

在xaml中，您只需使用它即可：

In xaml, you simply use it:

    <DataGrid ItemsSource="{Binding SomeCollection}">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding NonNumericProperty}"/>
            <local:DataGridNumericColumn Binding="{Binding NumericProperty}"/>
        </DataGrid.Columns>
    </DataGrid>

希望这会有所帮助

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