[WPF] WPF做的漂亮的登陆界面[附源码]

<Window x:Class="WpfFrist.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         WindowStyle="None" AllowsTransparency="True" Background="{x:Null}"
        Title="MainWindow" Height="300" Width="300" WindowStartuplocatio{过滤}n="CenterScreen">
    <Grid  Width="{Binding Width, ElementName=w}" Height="{Binding Height, ElementName=w}">
        <Grid.RowDefinitions>
            <RowDefinition Height="150" />
            <RowDefinition Height="50" />
            <RowDefinition Height="50" />
            <RowDefinition  />
        </Grid.RowDefinitions>
        <Border Grid.RowSpan="4" BorderBrush="Gray" BorderThickness="3" CornerRadius="20" Margin="10"  Opacity="1"  Background="White"></Border>
        <Button Style="{StaticResource BtnCloseStyle}" Name="btnClose"  Grid.Row="0"  Click="Button_Click" ></Button>
        <Image Grid.Row="0"  VerticalAlignment="Center" Width="120"  Height="120" Source="/Resources/QQ截图20161123091013.png" />
        <TextBox x:Name="UserTextBox"  Grid.Row="1"  Width="200" VerticalAlignment="Center" BorderThickness="0,0,0,1" Height="23"></TextBox>
        <TextBlock Foreground="DarkGray"  Grid.Row="1"  IsHitTestVisible="False" HorizontalAlignment="Center" Height="23" Text="请输入用户名" VerticalAlignment="Center" Width="90" FontFamily="Microsoft YaHei">
            <TextBlock.Style>
                <Style TargetType="{x:Type TextBlock}">
                    <Setter Property="Visibility" Value="Collapsed"/>
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding Text, ElementName=UserTextBox}" Value="">
                            <Setter Property="Visibility" Value="Visible"/>
                        </DataTrigger>
                    </Style.Triggers>
</Style>
            </TextBlock.Style>
        </TextBlock>
        <TextBox  x:Name="PwdTextBox"   Grid.Row="2"  Width="200" VerticalAlignment="Center" BorderThickness="0,0,0,1" Height="23"></TextBox>
        <TextBlock Foreground="DarkGray" Grid.Row="2"  IsHitTestVisible="False" HorizontalAlignment="Center" Height="23" Text="请输入密码" VerticalAlignment="Center" Width="90" FontFamily="Microsoft YaHei">
            <TextBlock.Style>
                <Style TargetType="{x:Type TextBlock}">
                    <Setter Property="Visibility" Value="Collapsed"/>
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding Text, ElementName=PwdTextBox}" Value="">
                            <Setter Property="Visibility" Value="Visible"/>
                        </DataTrigger>
                    </Style.Triggers>
</Style>
            </TextBlock.Style>
        </TextBlock>
        <Button Name="btnlogin" Click="btnlogin_Click" Grid.Row="2" Style="{StaticResource BtnLoginStyle}"  >
            <!--<Button.Background>
                <ImageBrush ImageSource="/Resources/LoginBtn.jpg" Stretch="Fill"/>
            </Button.Background>-->
        </Button>
    </Grid>
</Window>