初步完成邮件功能

DMS.WPF/Views/Dialogs/EmailTemplateDialog.xaml

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+<ui:ContentDialog
+    x:Class="DMS.WPF.Views.Dialogs.EmailTemplateDialog"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:ui="http://schemas.inkore.net/lib/ui/wpf/modern"
+    xmlns:hc="https://handyorg.github.io/handycontrol"
+    xmlns:vm="clr-namespace:DMS.WPF.ViewModels.Dialogs"
+    Title="{Binding DialogTitle}"
+    d:DataContext="{d:DesignInstance Type=vm:EmailTemplateDialogViewModel}"
+    CloseButtonCommand="{Binding CancelCommand}"
+    CloseButtonText="取消"
+    DefaultButton="Primary"
+    PrimaryButtonCommand="{Binding SaveCommand}"
+    PrimaryButtonText="保存"
+    mc:Ignorable="d">
+
+    <ui:ContentDialog.Resources>
+        <Style x:Key="LabelStyle" TargetType="TextBlock">
+            <Setter Property="VerticalAlignment" Value="Center" />
+            <Setter Property="HorizontalAlignment" Value="Right" />
+            <Setter Property="Margin" Value="0,0,10,0" />
+        </Style>
+    </ui:ContentDialog.Resources>
+
+    <ScrollViewer Margin="16">
+        <StackPanel>
+            <!-- 模板名称 -->
+            <hc:TextBox hc:InfoElement.Title="模板名称:" 
+                        Text="{Binding Name, UpdateSourceTrigger=PropertyChanged}" 
+                        Margin="0,0,0,15"/>
+
+            <!-- 模板代码 -->
+            <hc:TextBox hc:InfoElement.Title="模板代码:" 
+                        Text="{Binding Code, UpdateSourceTrigger=PropertyChanged}" 
+                        Margin="0,0,0,15"/>
+
+            <!-- 邮件主题 -->
+            <hc:TextBox hc:InfoElement.Title="邮件主题:" 
+                        Text="{Binding Subject, UpdateSourceTrigger=PropertyChanged}" 
+                        Margin="0,0,0,15"/>
+
+            <!-- 邮件内容 -->
+            <TextBlock Text="邮件内容:" Margin="0,0,0,5" />
+            <hc:TextBox Text="{Binding Body, UpdateSourceTrigger=PropertyChanged}" 
+                        AcceptsReturn="True" 
+                        TextWrapping="Wrap" 
+                        Height="150"
+                        Margin="0,0,0,15" />
+
+            <!-- HTML格式 -->
+            <CheckBox Content="HTML格式" 
+                      IsChecked="{Binding IsHtml}" 
+                      Margin="0,0,0,15"/>
+
+            <!-- 启用 -->
+            <CheckBox Content="启用" 
+                      IsChecked="{Binding IsActive}" 
+                      Margin="0,0,0,15"/>
+        </StackPanel>
+    </ScrollViewer>
+</ui:ContentDialog>