C#:ModernHttpClient,您在您的应用程序中引用便携式版本 - 您需要引用平台(iOS/Android)版本

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【中文标题】C#:ModernHttpClient,您在您的应用程序中引用便携式版本 - 您需要引用平台(iOS/Android)版本【英文标题】:C#: ModernHttpClient, You're referencing the Portable version in your App - you need to reference the platform (iOS/Android) version 【发布时间】:2016-06-20 07:54:59 【问题描述】:

我正在使用 ModernHttpClient 库,我正在尝试从 httpClient 的响应中获取 Cookie

public static async Task<String> loginUser()

    var values = new List<KeyValuePair<string, string>>
    
        new KeyValuePair<string, string>("username", "*****"),
        new KeyValuePair<string, string>("password", "*****"),
    ;
    NativeCookieHandler cookieHandler = new NativeCookieHandler();
    NativeMessageHandler messageHandler = new NativeMessageHandler(false, false, cookieHandler);
    var httpClient = new HttpClient(messageHandler);

    var response = await httpClient.PostAsync(RestApiPaths.LOGIN, new FormUrlEncodedContent(values));

    response.EnsureSuccessStatusCode();
    String resultString = await response.Content.ReadAsStringAsync();
    System.Diagnostics.Debug.WriteLine("resultString: " + resultString);
    IEnumerable<Cookie> responseCookies = cookieHandler.Cookies;
    Cookie mCookie = responseCookies.FirstOrDefault();
    RestApiPaths.mCookie = mCookie;
    return resultString;


但是下面一行给出了错误:

IEnumerable<Cookie> responseCookies = cookieHandler.Cookies;

错误:

MonoDroid] UNHANDLED EXCEPTION:
[MonoDroid] System.Exception: You're referencing the Portable version in your App - you need to reference the platform (ios/android) version
[MonoDroid]   at Gogch.MyClass+<loginUser>c__async0.MoveNext () <0x9e0d9e08 + 0x004b8> in <filename unknown>:0 
[MonoDroid] --- End of stack trace from previous location where exception was thrown ---
[MonoDroid]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0x9d3a3670 + 0x00024> in <filename unknown>:0 
[MonoDroid]   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) <0x9d3a2ff8 + 0x000bb> in <filename unknown>:0 
[MonoDroid]   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) <0x9d3a2dd0 + 0x0008b> in <filename unknown>:0 
[MonoDroid]   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) <0x9d6ecaa8 + 0x0003f> in <filename unknown>:0 
[MonoDroid]   at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () <0xa1f0fa18 + 0x0001b> in <filename unknown>:0 
[MonoDroid]   at Gogch.Droid.MainActivity+<button_OnClick>c__async0.MoveNext () <0xaf58c608 + 0x00137> in <filename unknown>:0 
[MonoDroid] --- End of stack trace from previous location where exception was thrown ---
[MonoDroid]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0x9d3a3670 + 0x00024> in <filename unknown>:0 
[MonoDroid]   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>m__0 (System.Object state) <0x9d3a4488 + 0x0003f> in <filename unknown>:0 
[MonoDroid]   at Android.App.SyncContext+<Post>c__AnonStorey0.<>m__0 () <0xa1f0f968 + 0x00027> in <filename unknown>:0 
[MonoDroid]   at Java.Lang.Thread+RunnableImplementor.Run () <0xa1f0f7b8 + 0x0003f> in <filename unknown>:0 
[MonoDroid]   at Java.Lang.IRunnableInvoker.n_Run (IntPtr jnienv, IntPtr native__this) <0xa1f0f710 + 0x0003f> in <filename unknown>:0 
[MonoDroid]   at (wrapper dynamic-method) System.Object:ba036dc5-deef-4850-b986-e1e85c84e6de (intptr,intptr)
[art] JNI RegisterNativeMethods: attempt to register 0 native methods for android.runtime.JavaProxyThrowable
[AndroidRuntime] Shutting down VM
[AndroidRuntime] FATAL EXCEPTION: main
[AndroidRuntime] Process: com.cinch.gogch, PID: 18910
[AndroidRuntime] java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
[AndroidRuntime]    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
[AndroidRuntime] Caused by: java.lang.reflect.InvocationTargetException
[AndroidRuntime]    at java.lang.reflect.Method.invoke(Native Method)
[AndroidRuntime]    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
[AndroidRuntime]    ... 1 more
[AndroidRuntime] Caused by: android.runtime.JavaProxyThrowable: System.Exception: You're referencing the Portable version in your App - you need to reference the platform (iOS/Android) version
[AndroidRuntime]   at Gogch.MyClass+<loginUser>c__async0.MoveNext () <0x9e0d9e08 + 0x004b8> in <filename unknown>:0 
[AndroidRuntime] --- End of stack trace from previous location where exception was thrown ---
[AndroidRuntime]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0x9d3a3670 + 0x00024> in <filename unknown>:0 
[AndroidRuntime]   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) <0x9d3a2ff8 + 0x000bb> in <filename unknown>:0 
[AndroidRuntime]   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) <0x9d3a2dd0 + 0x0008b> in <filename unknown>:0 
[AndroidRuntime]   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) <0x9d6ecaa8 + 0x0003f> in <filename unknown>:0 
[AndroidRuntime]   at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () <0xa1f0fa18 + 0x0001b> in <filename unknown>:0 
[AndroidRuntime]   at Gogch.Droid.MainActivity+<button_OnClick>c__async0.MoveNext () <0xaf58c608 + 0x00137> in <filename unknown>:0 
[AndroidRuntime] --- End of stack trace from previous location where exception was thrown ---
[AndroidRuntime]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0x9d3a3670 + 0x00024> in <filename unknown>:0 
[AndroidRuntime]   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>m__0 (System.Object state) <0x9d3a4488 + 0x0003f> in <filename unknown>:0 
[AndroidRuntime]   at Android.App.SyncContext+<Post>c__AnonStorey0.<>m__0 () <0xa1f0f968 + 0x00027> in <filename unknown>:0 
[AndroidRuntime]   at Java.Lang.Thread+RunnableImplementor.Run () <0xa1f0f7b8 + 0x0003f> in <filename unknown>:0 
[AndroidRuntime]   at Java.Lang.IRunnableInvoker.n_Run (IntPtr jnienv, IntPtr native__this) <0xa1f0f710 + 0x0003f> in <filename unknown>:0 
[AndroidRuntime]   at (wrapper dynamic-method) System.Object:ba036dc5-deef-4850-b986-e1e85c84e6de (intptr,intptr)
[AndroidRuntime]    at mono.java.lang.RunnableImplementor.n_run(Native Method)
[AndroidRuntime]    at mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:30)
[AndroidRuntime]    at android.os.Handler.handleCallback(Handler.java:746)
[AndroidRuntime]    at android.os.Handler.dispatchMessage(Handler.java:95)
[AndroidRuntime]    at android.os.Looper.loop(Looper.java:148)
[AndroidRuntime]    at android.app.ActivityThread.main(ActivityThread.java:5443)
[AndroidRuntime]    ... 3 more

我在 PCL 中有此代码。为什么我会收到此错误?如何正确获取 cookie?

编辑:

现在我在我的 pcl 和 ios 项目中都使用了modernhttpclient 库来使其工作。如果我从 ios 项目中删除它。我得到同样的错误。

【问题讨论】:

【参考方案1】:

当您添加对解决方案的引用时,您是否添加了对 PCL 项目以及 iOS 和 Android 项目的引用?

是同一个Nuget包,只是android包增加了对

的引用

~\packages\modernhttpclient.2.4.2\lib\MonoAndroid

iOS 获得对

的引用

~\packages\modernhttpclient.2.4.2\lib\Xamarin.iOS10

我假设这是在 Visual Studio 中?也许只是卸载软件包并重新安装它(并在解决方案级别安装它)。

【讨论】:

我正在使用 Xamarin Studio 我仍然认为这是同一个问题 - 那里的包管理器应该能够为每个平台下载正确的包。【参考方案2】:

对于未来的谷歌员工:当您将一些 NuGet 引用(例如 modernhttpclient-updated)更新为以 Xamarin.Android 8.1 为目标的版本时(例如)而您的应用程序以 Xamarin.Android 6.0 为目标时,可能会发生这种情况:在这种情况下,您的 Xamarin.Android项目不会引用特定于平台的代码,而只会引用共享

注意 NuGet 警告!

【讨论】:

modernhttpclient-updated 的哪个版本针对哪个 xamarin android 版本?【参考方案3】:

确保您的项目对程序集有正确的引用:

Android:在MonoAndroid 文件夹中 iOS:在Xamarin.iOS10 文件夹(或MonoTouch 文件夹)中 PCL:在Portable-Net45+WinRT45+WP8+WPA81 文件夹中

如果这没有帮助,我建议停止使用 ModernHttpClient,因为下一个:

    ModernHttpClient 的 Xamarin.iOS provides 功能开箱即用(虽然有点受限)。 实际上,ModernHttpClient.NativeMessageHandlercookieHandler 参数没有任何作用。您可以在源代码中查看它(Android,iOS)。您可以直接处理 cookie,而不是使用 ModernHttpClient 实现,请参阅源代码示例(Android、iOS)。

【讨论】:

我宁愿建议使用modernhttpclient-updated,因为 Xamarin 的 HttpClientHandler 不适用于 Android 4.x。【参考方案4】:

Eugene 和 HeisenBerg 解释了更多说明。 你被“Bait and Switch”困住了

【讨论】:

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