Silverlight 4.0 Silverlight 4文本框中的字符大小写

我正在编写Silverlight 4业务应用程序，遇到了一个问题。我需要文本框中的文本输入被强制为大写。我从各种论坛了解到Silverlight没有实现CharacterCasing和CSS样式

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有没有其他方法可以做到这一点

您可以通过创建一个行为来实现这一点，如：

public class UpperCaseAction : TriggerAction<TextBox>
{

    protected override void Invoke(object parameter)
    {
        var selectionStart = AssociatedObject.SelectionStart;
        var selectionLenght = AssociatedObject.SelectionLength;
        AssociatedObject.Text = AssociatedObject.Text.ToUpper();
        AssociatedObject.SelectionStart = selectionStart;
        AssociatedObject.SelectionLength = selectionLenght;
    }
}

<Grid x:Name="LayoutRoot" Background="White">
    <TextBox TextWrapping="Wrap" VerticalAlignment="Top" Margin="10">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="TextChanged">
                <ASD_Answer009_Behaviors:UpperCaseAction/>
            </i:EventTrigger>
        </i:Interaction.Triggers>
    </TextBox>
</Grid>

要创建和使用行为，您需要下载并安装，并添加对的引用。

请尝试以下操作：

private void txt2_KeyDown(object sender, KeyEventArgs e)
{
    e.Handled = MakeUpperCase((TextBox)sender, e);
}

bool MakeUpperCase(TextBox txt, KeyEventArgs e)
{
    if (Keyboard.Modifiers != ModifierKeys.None || (e.Key < Key.A) || (e.Key > Key.Z))  //do not handle ModifierKeys (work for shift key)
    {
        return false;
    }
    else
    {
        string n = new string(new char[] { (char)e.PlatformKeyCode });
        int nSelStart = txt.SelectionStart;

        txt.Text = txt.Text.Remove(nSelStart, txt.SelectionLength); //remove character from the start to end selection
        txt.Text = txt.Text.Insert(nSelStart, n); //insert value n
        txt.Select(nSelStart + 1, 0); //for cursortext

        return true; //stop to write in txt2
    }

}

private void txt2\u KeyDown（对象发送方，KeyEventArgs e）
{
e、 Handled=MakeUpperCase（（文本框）sender，e）；
}
bool MakeUpperCase（文本框txt，KeyEventArgs e）
{
如果（Keyboard.Modifiers！=ModifierKeys.None | | |（e.KeyKey.Z））//不处理ModifierKeys（使用shift键）
{
返回false；
}
其他的
{
字符串n=新字符串（新字符[]{（字符）e.PlatformKeyCode}）；
int nSelStart=txt.SelectionStart；
txt.Text=txt.Text.Remove（nSelStart，txt.SelectionLength）；//从开始到结束选择中删除字符
txt.Text=txt.Text.Insert（nSelStart，n）；//插入值n
选择（开始+1，0）；//用于cursortext
返回true；//停止在txt2中写入
}
}

    private void txt2_KeyDown(object sender, KeyEventArgs e)
    {

        if (Keyboard.Modifiers != ModifierKeys.None) return; //do not handle ModifierKeys (work for shift key)

        string n = new string(new char[] { (char)e.PlatformKeyCode });
        int nSelStart = txt2.SelectionStart;

        txt2.Text = txt2.Text.Remove(nSelStart, txt2.SelectionLength); //remove character from the start to end selection
        txt2.Text = txt2.Text.Insert(nSelStart, n); //insert value n
        txt2.Select(nSelStart + 1, 0); //for cursortext

        e.Handled = true; //stop to write in txt2

    }

private void txt2_KeyDown(object sender, KeyEventArgs e)
{
    e.Handled = MakeUpperCase((TextBox)sender, e);
}

bool MakeUpperCase(TextBox txt, KeyEventArgs e)
{
    if (Keyboard.Modifiers != ModifierKeys.None || (e.Key < Key.A) || (e.Key > Key.Z))  //do not handle ModifierKeys (work for shift key)
    {
        return false;
    }
    else
    {
        string n = new string(new char[] { (char)e.PlatformKeyCode });
        int nSelStart = txt.SelectionStart;

        txt.Text = txt.Text.Remove(nSelStart, txt.SelectionLength); //remove character from the start to end selection
        txt.Text = txt.Text.Insert(nSelStart, n); //insert value n
        txt.Select(nSelStart + 1, 0); //for cursortext

        return true; //stop to write in txt2
    }

}