Question

所以我的可移植类库中有这个按钮，它应该直接将我创建的xml文件附加到邮件中并使用Messaging PlugIn发送它。问题是。在PCL中不支持.WithAttachment（）所以我想问一下我是否可以使用DependencyService来解决这个问题，如果是的话，怎么做？

我可以从UWP类返回.WithAttachment（）（因为UWP是我的目标平台）吗？不会有冲突，因为我已经读过UWP中.WithAttachment（）的重载是.WithAttachment（IStorageFile文件）。

private void Senden_Clicked(object sender, EventArgs e)
        {
            var emailMessenger = CrossMessaging.Current.EmailMessenger;
            if (emailMessenger.CanSendEmail)
            {
                var email = new EmailMessageBuilder()
                  .To("my.address@gmail.com")
                  .Subject("Test")
                  .Body("Hello there!")
                  //.WithAttachment(String FilePath, string ContentType) overload showing in PCL
                  //.WithAttachment(IStorageFile file) overload for the UWP according to the documentation
                  .Build();
                emailMessenger.SendEmail(email);
            }

        }

修改

我已经能够修改Nick Zhou的答案，以便能够通过按钮点击发送带附件的电子邮件。我只是改变了代码的和平：

var picker = new Windows.Storage.Pickers.FileOpenPicker
    {
        ViewMode = Windows.Storage.Pickers.PickerViewMode.List,
        SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary
    };
    picker.FileTypeFilter.Add("*");

到此：

StorageFolder sf = ApplicationData.Current.LocalFolder;
            var file = await sf.GetFileAsync("daten.xml");

当然，您需要在应用程序的本地文件夹而不是文档库中创建文件。

Answer 1

问题是。在PCL中不支持.WithAttachment（）所以我想问一下我是否可以使用DependencyService来解决这个问题，如果是的话，怎么做？

当然，您可以使用DependencyService来实现发送电子邮件。但你可以在后面创建两个interface代码。

SendEmail接口

 public interface IMessageEmail
    {
       void SendEmailMehod(string address, string subject, string body, StorageFile attactment = null);
    }

UWP项目中的IMessageEmail实现。

public void SendEmailMehod(string address, string subject, string body, StorageFile attactment = null)
 {
     var emailMessenger = CrossMessaging.Current.EmailMessenger;
     if (emailMessenger.CanSendEmail)
     {
         if (attactment != null)
         {
             var email = new EmailMessageBuilder()
       .To(address)
       .Subject(subject)
       .Body(body)
       .WithAttachment(attactment)
       .Build();
             emailMessenger.SendEmail(email);
         }
         else
         {
             var email = new EmailMessageBuilder()
       .To(address)
       .Subject(subject)
       .Body(body)
       .Build();
             emailMessenger.SendEmail(email);
         }
     }
 }

正如您所见，.WithAttachment(attactment)参数为IStorageFile。所以你需要将文件传递给方法。因此，您可以创建另一个DependencyService。

IFilePicker接口

public interface IFilePicker
    {
        Task<StorageFile> getFileAsync();
    }

UWP项目中的IMessageEmail实现。

public async Task<StorageFile> getFileAsync()
{
    var picker = new Windows.Storage.Pickers.FileOpenPicker
    {
        ViewMode = Windows.Storage.Pickers.PickerViewMode.List,
        SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary
    };
    picker.FileTypeFilter.Add("*");

    var file = await picker.PickSingleFileAsync();

    if (file != null)
    {
        return file;
    }

    return null;
}

您可以尝试我上传到github的project。

Xamarin PCL中的消息插件（Carel Lotz）？

1 个答案: