以xamarin形式从signaturepad获取图像？

Question

下载xamarin.signaturePad示例后，我只想将图像从签名簿获取到内存流，并显示在我的图像视图中。这是我的代码，它在iOS上运行良好，但在安卓上它显示为空流

var image = await padView.GetImageStreamAsync(SignatureImageFormat.Png);
var stream = new MemoryStream();
image.CopyToAsync(stream);
var imageByteArray= stream.ToArray();
img_result.Source = ImageSource.FromStream(() => newMemoryStream(imageByteArray));

Answer 1

只需将您的图像流传输到记忆流。它应该是有效的

var imageStream = await padView.GetImageStreamAsync(SignatureImageFormat.Png);

// this is actually memory-stream so convertible to it
var mstream = (MemoryStream)imageStream;

//Unfortunately above mstream is not valid until you take it as byte array
mstream = new MemoryStream(mstream.ToArray());

//Now you can
img_result.Source = ImageSource.FromStream(()=>mstream);