当退格键按下c#时删除文本框内容

本文关键字：文本 删除 | 更新日期: 2023-09-27 18:05:32

我试图在按下退格键时删除文本框的内容，但它不起作用。代码:

private void txtConteudo_TextChanged(object sender, TextChangedEventArgs e)
    {
        if(Keyboard.IsKeyDown(Key.Back))
        {
            txtConteudo.Text = "";
        }
    }

文本框的xaml:

<TextBox x:Name="txtConteudo" Text="0" FontSize="16" IsReadOnly="True" Margin="10,5,16,139" TextChanged="txtConteudo_TextChanged" />

当退格键按下c#时删除文本框内容

您应该使用PreviewKeyDown事件。尝试将当前代码更改为:

代码:

private void txtConteudo_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (Keyboard.IsKeyDown(Key.Back))
    {
        txtConteudo.Text = "";
    }
}
Xaml: 

<TextBox x:Name="txtConteudo" Text="0" FontSize="16" IsReadOnly="True" Margin="10,5,16,139" PreviewKeyDown="txtConteudo_PreviewKeyDown" />

试试这个

private void textBox1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyValue == 8)
            {
                textBox1.Text = "";
            }
        }

首先，您不应该使用textchanged事件。使用KeyDown event

private void txtConteudo_KeyDown(object sender, KeyEventArgs e)
{
    if(e.KeyData == Key.Back)
    {
        txtConteudo.Text = "";
    }
}
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