Question

我正在尝试从我的Xamarin PCL项目将上传的图像发送到Amazon S3容器，以便android和iOS使用此代码工作，这是我的代码：

private async void PickPhoto()
        {
            if (!CrossMedia.Current.IsPickPhotoSupported)
            {
                await App.Current.MainPage.DisplayAlert("Photos Not Supported", ":( Permission not granted to photos.", "OK");
                return;
            }
            var file = await CrossMedia.Current.PickPhotoAsync();

            if (file == null)
                return;

            this.OrgLogo = ImageSource.FromStream(() =>
            {
                var stream = file.GetStream();
                return stream;
            });

            try
            {

                var credentials = new BasicAWSCredentials("xxxxxx", "xxxxxxxx");
                var client = new AmazonS3Client(credentials, RegionEndpoint.USEast1);
                var transferUtility = new TransferUtility(client);

                var filePath = file.Path;

                await transferUtility.UploadAsync(
                  filePath,
                  "xxx"
                );

            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.ToString());
            }

        }

但是得到如下的异常：

{System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NotImplementedException: Not implemented in reference assembly.
at PCLCrypto.WinRTCrypto.get_HashAlgorithmProvider () [0x00000] in :0
at Amazon.Runtime.Internal.Util.HashingWrapper.Init (System.String algorithmName) [0x00016] in D:\Jenkins\jobs\v3-stage-release\workspace\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Internal\Util_pcl-sl\HashingWrapper.pcl.cs:42
at Amazon.Runtime.Internal.Util.HashingWrapper..ctor (System.String algorithmName) [0x00019] in D:\Jenkins\jobs\v3-stage-release\workspace\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Internal\Util\HashingWrapper.cs:31
at Amazon.Runtime.Internal.Util.HashingWrapperMD5..ctor () [0x00000] in D:\Jenkins\jobs\v3-stage-release\workspace\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Internal\Util_pcl-sl\HashingWrapper.pcl.cs:116
at (wrapper managed-to-native) System.Reflection.MonoCMethod:InternalInvoke (System.Reflection.MonoCMethod,object,object[],System.Exception&)
at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00002] in /Users/builder/data/lanes/3540/1cf254db/source/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:644

有人可以帮助我做错了吗？

Answer 1

使用完全相同的插件我遇到了完全相同的问题。它似乎与PCLCrytpo库的Windows版本有关。由于我不关心Windows版本，我做了以下内容：

禁用（卸载）默认设置的Windows / Windows电话项目。
清理解决方案
重建解决方案。

这似乎解决了我的问题

Amazon S3服务不适用于Xamarin PCL项目中的Plugin.Media

1 个答案: