将Textblock绑定到字典值，其中键由用户输入给出

<Grid>
    <StackPanel>
        <TextBox x:Name="keyTextBox" TextChanged="KeyTextBox_TextChanged" />
        <TextBlock x:Name="valueTextBlock" Text="{Binding Path=Value}" />
    </StackPanel>
</Grid>

private Dictionary<string, string> dictionary = new Dictionary<string, string>();

private void KeyTextBox_TextChanged(object sender, TextChangedEventArgs e)
{
    string key = keyTextBox.Text;
    if (dictionary.ContainsKey(key))
    {
        valueTextBlock.Text = dictionary[key];
    }
    else
    {
        valueTextBlock.Text = "Key not found";
    }
}