BPASmartClient/Test/MainWindow.xaml

<Window
    x:Class="Test.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:Test"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="MainWindow"
    Width="800"
    Height="450"
    mc:Ignorable="d">
    <Grid>
        <StackPanel
            Margin="10"
            HorizontalAlignment="Center"
            VerticalAlignment="Center">

            <TextBox
                Width="150"
                Height="30"
                Margin="0 10" x:Name="textBox"/>

            <Button
                Width="150"
                Height="30"
                Click="Button_Click_1"
                Content="发送" />
        </StackPanel>
    </Grid>
</Window>