错误CS0535类不实现接口成员

Question

我是Visual Studio Xamarin的新手。在现有的xamarin android项目中，我必须添加一个Jar文件(SDK)，所以我创建了一个绑定库，但是它引发了一些错误，我试图通过使用metadata.xml来解决这些错误，其中一个如下所示：

在api.xml中搜索，我发现了以下内容：

<class abstract="false" deprecated="not deprecated" extends="android.app.Service" extends-generic-html" target="_blank">aware="android.app.Service" final="false" name="DeviceService" static="false" visibility="public">
<implements name="com.company.deviceService.IDeviceService" name-generic-aware="com.company.deviceService.IDeviceService">
</implements>
<constructor deprecated="not deprecated" final="false" name="DeviceService" static="false" type="com.company.deviceService.DeviceService" visibility="public">
</constructor>
...
<method abstract="false" deprecated="not deprecated" final="false" name="setSignResult" native="false" return="void" static="false" synchronized="false" visibility="public">
<parameter name="p0" type="int">
</parameter>
</method>

<method abstract="false" deprecated="not deprecated" final="false"   name="getSignResult" native="false" return="int" static="false" synchronized="false" visibility="public">
</method>
...
</class>

在接口中有这样的方法：

IntPtr id_setSignResult_I;
        public unsafe void SetSignResult (int p0)
        {
            if (id_setSignResult_I == IntPtr.Zero)
                id_setSignResult_I = JNIEnv.GetMethodID (class_ref, "setSignResult", "(I)V");
            JValue* __args = stackalloc JValue [1];
            __args [0] = new JValue (p0);
            JNIEnv.CallVoidMethod (Handle, id_setSignResult_I, __args);
        }

但是，当我搜索生成的类DeviceService.cs时，我发现了以下内容：

static Delegate cb_setSignResult_I;
#pragma warning disable 0169
        static Delegate GetSetSignResult_IHandler ()
        {
            if (cb_setSignResult_I == null)
                cb_setSignResult_I = JNINativeWrapper.CreateDelegate ((Action<IntPtr, IntPtr, int>) n_SetSignResult_I);
            return cb_setSignResult_I;
        }

        static void n_SetSignResult_I (IntPtr jnienv, IntPtr native__this, int p0)
        {
            global::com.company.deviceService.DeviceService __this = global::Java.Lang.Object.GetObject<global::com.company.deviceService.DeviceService> (jnienv, native__this, JniHandleOwnership.DoNotTransfer);
            __this.SignResult = p0;
        }
#pragma warning restore 0169

        static IntPtr id_getSignResult;
        static IntPtr id_setSignResult_I;

        public virtual unsafe int SignResult {
            // Metadata.xml XPath method reference: path="/api/package[@name='com.company.deviceService']/class[@name='DeviceService']/method[@name='getSignResult' and count(parameter)=0]"
            [Register ("getSignResult", "()I", "GetGetSignResultHandler")]
            get {
                if (id_getSignResult == IntPtr.Zero)
                    id_getSignResult = JNIEnv.GetMethodID (class_ref, "getSignResult", "()I");
                try {

                    if (GetType () == ThresholdType)
                        return JNIEnv.CallIntMethod  (Handle, id_getSignResult);
                    else
                        return JNIEnv.CallNonvirtualIntMethod  (Handle, ThresholdClass, JNIEnv.GetMethodID (ThresholdClass, "getSignResult", "()I"));
                } finally {
                }
            }
            // Metadata.xml XPath method reference: path="/api/package[@name='com.company.deviceService']/class[@name='DeviceService']/method[@name='setSignResult' and count(parameter)=1 and parameter[1][@type='int']]"
            [Register ("setSignResult", "(I)V", "GetSetSignResult_IHandler")]
            set {
                if (id_setSignResult_I == IntPtr.Zero)
                    id_setSignResult_I = JNIEnv.GetMethodID (class_ref, "setSignResult", "(I)V");
                try {
                    JValue* __args = stackalloc JValue [1];
                    __args [0] = new JValue (value);

                    if (GetType () == ThresholdType)
                        JNIEnv.CallVoidMethod  (Handle, id_setSignResult_I, __args);
                    else
                        JNIEnv.CallNonvirtualVoidMethod  (Handle, ThresholdClass, JNIEnv.GetMethodID (ThresholdClass, "setSignResult", "(I)V"), __args);
                } finally {
                }
            }
        }

由于某种原因，绑定生成器不正确地推断方法实现或返回类型，我不知道，研究api.xml似乎是正确的：void setSignResult(int p0)。我试图通过使用metadata.xml修改行为，但错误相同：

  <attr path="/api/package[@name='Com.Company.deviceservice']/class[@name='DeviceService']/method[@name='SetSignResult' 
    and count(parameter)=1
    and parameter[1][@type='int']]/parameter[1]"
    name="managedReturn">Java.Lang.Void</attr>

我找了另一个接口方法的实现，和之前提到的类似的方法进行了比较，我发现它正确的生成了方法，看一下：

static IntPtr id_bcrSymbologyToText_I;
        [Register ("bcrSymbologyToText", "(I)Ljava/lang/String;", "GetBcrSymbologyToText_IHandler")]

        public virtual unsafe string BcrSymbologyToText (int p0)
        {
            if (id_bcrSymbologyToText_I == IntPtr.Zero)
                id_bcrSymbologyToText_I = JNIEnv.GetMethodID (class_ref, "bcrSymbologyToText", "(I)Ljava/lang/String;");
            try {
                JValue* __args = stackalloc JValue [1];
                __args [0] = new JValue (p0);

                if (GetType () == ThresholdType)
                    return JNIEnv.GetString (JNIEnv.CallObjectMethod  (Handle, id_bcrSymbologyToText_I, __args), JniHandleOwnership.TransferLocalRef);
                else
                    return JNIEnv.GetString (JNIEnv.CallNonvirtualObjectMethod  (Handle, ThresholdClass, JNIEnv.GetMethodID (ThresholdClass, "bcrSymbologyToText", "(I)Ljava/lang/String;"), __args), JniHandleOwnership.TransferLocalRef);
            } finally {
            }
        }

请很快需要你的帮助！

Answer 1

找到答案：

Xamarin Binding Generator（负责绑定库）以错误的方式将一些java类转换到C#类，因为它无法执行reingenieering，所以Generator创建了一个setSignResult作为java方法的属性结果。解决这些问题的方法是使用metadata.xml来处理某些类型的错误，或者在我的例子中，通过创建一个具有相同自动生成类名的分部类来实现丢失的方法。由于Binding Generator用自己的实现创建了DeviceService分部类，所以我用以下实现创建了另一个DeviceService分部类，实现了missing方法：

public partial class DeviceService
    {
        public void SetSignResult(int p)
        {
            SignResult = p;
        }
}

工作完美！

感谢所有人