摘要：
本节介绍如何通过邮件将生成的贺卡发送给朋友。确保您已完成上一章。在主页中。xaml-Cs页面，在SendMail_Click方法中，新定义EmailMessage的对象，并转换上一节中生成的Wishes。jpg文件作为电子邮件附件发送给其他人。该应用程序将打开电子邮件程序，创建新电子邮件，并添加祝福。jpg作为电子邮件附件。
本小节介绍如何通过邮件将生成的贺卡发送给朋友。使用到了EmailMessageAPI, 需要引入的命名空间为Windows.ApplicationModel.Email。
请确保完成了以前的章节。
在MainPage.xaml.cs页面，在SendMail_Click方法中，新定义EmailMessage的对象，将前一节中生成的Wishes.jpg文件作为邮件附件发送给其他人。 添加如下代码：
EmailMessage emailMessage = new EmailMessage();
emailMessage.Body = "Thanksgiving Card from your friend, this is generated by Card App.";
var stream1 = Windows.Storage.Streams.RandomAccessStreamReference.CreateFromFile(file);
var attachment = new Windows.ApplicationModel.Email.EmailAttachment(file.Name, stream1);
emailMessage.Attachments.Add(attachment);
await EmailManager.ShowComposeNewEmailAsync(emailMessage);
修改后， SendMail_Click方法的完整代码如下：
private async void SendMail_Click(object sender, RoutedEventArgs e)
{
RenderTargetBitmap renderTrgBitmap = new RenderTargetBitmap();
await renderTrgBitmap.RenderAsync(gridMsg);
var pixelBuffer = await renderTrgBitmap.GetPixelsAsync();
var file = await KnownFolders.PicturesLibrary.CreateFileAsync("Wishes.jpg", CreationCollisionOption.ReplaceExisting);
using (var stream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, stream);
encoder.SetPixelData(BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Straight,
(uint)renderTrgBitmap.PixelWidth,
(uint)renderTrgBitmap.PixelHeight,
96d, 96d,
pixelBuffer.ToArray());
await encoder.FlushAsync();
}
EmailMessage emailMessage = new EmailMessage();
emailMessage.Body = "Thanksgiving Card from your friend, this is generated by Card App.";
var stream1 = Windows.Storage.Streams.RandomAccessStreamReference.CreateFromFile(file);
var attachment = new Windows.ApplicationModel.Email.EmailAttachment(file.Name, stream1);
emailMessage.Attachments.Add(attachment);
await EmailManager.ShowComposeNewEmailAsync(emailMessage);
}
运行程序，单击Get a Wishes按钮，再单击Send to Friend按钮。App将打开邮件程序，新建一个邮件，并将Wishes.jpg添加为邮件附件。