从 Xamarin Forms 调用 GetStringAsync 挂起（使用模拟器）

Question

Xamarin 的新手并调用 API 我有一个简单的网络服务器返回 JSON，它在 Postman 中工作。 我有一个虚拟证书，所以我可以使用 SSL 进行调用，但是当我到达 GetStringAsync 方法时，即使在启用 TLS1.2 并执行异步任务之后，我的代码也会挂起。

我的 AndroidManifest 中有这个

这是 output：

02-17 14:36:49.951 D/Mono (31087): DllImport 试图加载：'/system/lib/liblog.so'。 02-17 14:36:49.951 D/Mono (31087): DllImport 加载库 '/system/lib/liblog.so'。 02-17 14:36:49.951 D/Mono (31087): DllImport 搜索：'/system/lib/liblog.so' ('/system/lib/liblog.so')。 02-17 14:36:49.951 D/Mono (31087): 搜索“__android_log_print”。 02-17 14:36:49.951 D/Mono (31087)：探测“__android_log_print”。 02-17 14:36:49.951 D/Mono (31087): 发现为“__android_log_print”。 02-17 14：36：49.956 I/monodroid-net（31087）：取消连接时被捕获的例外：ZD52387880E1EA22817A7A7A2D3759213819Z.NET.SSOCKECTION.SOCKECTION.SOOCKECTION.SOOCKECTION：socket封闭了02-17 152-17 14：36：36：49.956 I/MONED77.956 I/MONDODRID NET NET NET NET NET（3） .Interop.JniEnvironment+InstanceMethods.CallVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0006e] in <89755ea61d9c4ae0a40ce90b872c9e2d>:0 02-17 14:36:49.956 I/ monodroid-net(31087): at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeAbstractVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00014] in <89755ea61d9c4ae0a40ce90b872c9e2d>:0 02-17 14:36:49.956 I/monodroid-net(31087)：在 Javax.Net.Ssl.HttpsURLConnectionInvoker。 在 /Users/builder/azdo/_work/451/s/xamarin-android/src/Mono.Android/obj/Release/monoandroid10/android-29/mcw/Javax.Net.Ssl.HttpsURLConnection 中连接 () [0x00000]。 cs:422 02-17 14:36:49.956 I/monodroid-net(31087): at Xamarin.Android.Net.AndroidClientHandler+<>c__DisplayClass44_0.b__0 () [0x0002b] in /Users/builder/azdo/_work/451/ s/xamarin-android/src/Mono.Android/Xamarin.Android.Net/AndroidClientHandler.cs:351 02-17 14:36:49.956 I/monodroid-net(31087): --- 托管 ZD52387880E1EA22817AZ2D.355 结束SocketException 堆栈跟踪 --- 02-17 14:36:49.956 I/monodroid-net(31087): java.net.SocketException: 套接字关闭 02-17 14:36:49.956 I/monodroid-net(31087): 在 java .net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:394) 02-17 14:36:49.956 I/monodroid-net(31087): at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPl ainSocketImpl.java:230) 02-17 14:36:49.956 I/monodroid-net(31087): at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:212) 02-17 14:36:49.956 I/monodroid- net(31087): at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:436) 02-17 14:36:49.956 I/monodroid-net(31087): at java.net.Socket.connect(Socket.Z93F725A07423F21C) 621) 02-17 14:36:49.957 I/monodroid-net(31087): at com.android.okhttp.internal.Platform.connectSocket(Platform.java:182) 02-17 14:36:49.957 I/monodroid- net(31087): at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:145) 02-17 14:36:49.957 I/monodroid-net(31087): at com.ZC31B32 364CE19CA8FCD150A417ECCE58Z.okhttp.internal.io.RealConnection.connect(RealConnection.java:116) 02-17 14:36:49.957 I/monodroid-net(31087): at com.android.okhttp.internal.http.StreamAllocation.findConnection( StreamAllocation.java:186) 02-17 14:36:49.957 I/monodroid-net(31087): at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:128) 02-17 14:36 :49.957 I/monodroid-net(31087): at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:97) 02-17 14:36:49.957 I/monodroid-net(31087): at Z4D236D9A2D102C5FE6AD1C50DA4 BEC50Z.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:289) 02-17 14:36:49.957 I/monodroid-net(31087): at com.android.okhttp.internal.http.HttpEngine. sendRequest(HttpEngine.java:232) 02-17 14:36:49.957 I/monodroid-net(31087): at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:465) 02-17 14 :36:49.957 I/monodroid-net(31087): at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:131) 02-17 14:36:49.957 I/monodroid-net(31087) : 在 com.android.okhttp.internal.huc.Dele gatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:90) 02-17 14:36:49.957 I/monodroid-net(31087): at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:30) 02- 17 14:36:49.957 I/monodroid-net(31087):