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M3: 发送邮件附件（2）

2015-11-24 17:23 393 查看

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

EmailMessage

API, 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。

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