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   源码介绍

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<Window x:Class="NanQi.Test.TextBoxTest"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:nanqi="http://nanqi.info"
        WindowStartupLocation="CenterScreen"
        Title="TextBoxTest" Height="300" Width="300">
    <Grid Margin="5">
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid.Resources>
            <Style TargetType="Button">
                <Setter Property="Width" Value="80" />
                <Setter Property="Height" Value="23" />
            </Style>
        </Grid.Resources>

        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="10" />
                <RowDefinition Height="23" />
                <RowDefinition Height="10" />
                <RowDefinition Height="23" />
                <RowDefinition Height="10" />
                <RowDefinition Height="23" />
                <RowDefinition Height="10" />
                <RowDefinition Height="23" />
                <RowDefinition Height="10" />
                <RowDefinition Height="23" />
                <RowDefinition Height="10" />
                <RowDefinition Height="23" />
                <RowDefinition Height="10" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="382*" />
                <ColumnDefinition Width="618*" />
            </Grid.ColumnDefinitions>
            <Grid.Resources>
                <Style TargetType="TextBox">
                    <Setter Property="Width" Value="120" />
                    <Setter Property="Height" Value="23" />
                    <Setter Property="Margin" Value="5,0,0,0" />
                    <Setter Property="HorizontalAlignment" Value="Left" />
                    <Setter Property="VerticalAlignment" Value="Center" />
                </Style>
                <Style TargetType="TextBlock">
                    <Setter Property="Margin" Value="0,0,5,0" />
                    <Setter Property="HorizontalAlignment" Value="Right" />
                    <Setter Property="VerticalAlignment" Value="Center" />
                </Style>
            </Grid.Resources>
            <TextBlock Text="Placeholder1" Grid.Row="1" />
            <TextBox Grid.Column="1" Grid.Row="1" nanqi:TextBoxHelper.Placeholder1="请输入筛选条件..."  />

            <TextBlock Text="Placeholder1Bug" Grid.Row="3" />
            <TextBox x:Name="placeholder1BugTextBox" Grid.Column="1" Grid.Row="3" FontStyle="Italic" Foreground="Red" nanqi:TextBoxHelper.Placeholder1="请输入筛选条件..." />
            
            <Button x:Name="placeholder1BugButton" Grid.Column="1" Grid.Row="3" Content="Bug" Width="40" HorizontalAlignment="Right" Click="placeholder1BugButton_Click" />

            <TextBlock Text="Placeholder2" Grid.Row="5" />
            <TextBox Grid.Column="1" Grid.Row="5" nanqi:TextBoxHelper.Placeholder2="请输入筛选条件..."  />

            <TextBlock Text="Placeholder2Bug" Grid.Row="7" />
            <TextBox x:Name="placeholder2BugTextBox" Grid.Column="1" Grid.Row="7" nanqi:TextBoxHelper.Placeholder2="请输入筛选条件..."  />

            <Button x:Name="placeholder2BugButton" Grid.Column="1" Grid.Row="7" Content="Bug" Width="40" HorizontalAlignment="Right" Click="placeholder2BugButton_Click" />

            <TextBlock Text="Placeholder3" Grid.Row="9" />
            <TextBox Grid.Column="1" Grid.Row="9" nanqi:TextBoxHelper.Placeholder3="请输入筛选条件..."  />

            <TextBlock Text="Placeholder3Test" Grid.Row="11" />
            <TextBox x:Name="placeholder3TestTextBox" Grid.Column="1" Grid.Row="11" nanqi:TextBoxHelper.Placeholder3="请输入筛选条件..."  />

            <Button x:Name="placeholder3TestButton" Grid.Column="1" Grid.Row="11" Content="Test" Width="40" HorizontalAlignment="Right" Click="placeholder3TestButton_Click" />
        </Grid>
       
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Grid.Row="1">
            <Button Content="_Close" x:Name="btnClose" Click="btnClose_Click" /> 
        </StackPanel>
    </Grid>
    
</Window>