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POXamarin Android - Linker and ServiceStack.Text
 

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    <p>I'm having trouble getting an application to work with full linking. This is my setup (my assembly names changed):</p> <ul> <li>Mono for Android 4.4.54</li> <li>An Android application (<em>MyApp</em>)</li> <li>A platform agnostic library (<em>MyLib</em>)</li> </ul> <p>I'm attempting to deserialise a type (Person) from JSON text using ServiceStack.Text. It works fine when only linking SDK assemblies.</p> <p>Rather than put linker include attributes in <em>MyLib</em>, I'm using a <em>LinkDescription</em> XML file in <em>MyApp</em>. It looks like this:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt; &lt;linker&gt; &lt;assembly fullname="MyLib"&gt; &lt;type fullname="MyLib.Person" preserve="fields"&gt; &lt;method name=".ctor" /&gt; &lt;/type&gt; &lt;/assembly&gt; &lt;/linker&gt; </code></pre> <p>This is my logcat output:</p> <pre><code>E/MyApp(14494): InitialiseUser(): System.TypeInitializationException: An exception was thrown by the type initializer for ServiceStack.Text.Json.JsonReader`1 ---&gt; System.ArgumentNullException: Argument cannot be null. E/MyApp(14494): Parameter name: method E/MyApp(14494): at System.Delegate.CreateDelegate (System.Type type, System.Object firstArgument, System.Reflection.MethodInfo method, Boolean throwOnBindFailure, Boolean allowClosed) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at System.Delegate.CreateDelegate (System.Type type, System.Reflection.MethodInfo method, Boolean throwOnBindFailure) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at ServiceStack.Text.PlatformExtensions.MakeDelegate (System.Reflection.MethodInfo mi, System.Type delegateType, Boolean throwOnBindFailure) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at ServiceStack.Text.Json.JsonReader.GetParseFn (System.Type type) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at ServiceStack.Text.Json.JsonTypeSerializer.GetParseFn (System.Type type) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at ServiceStack.Text.Common.TypeAccessor.Create (ITypeSerializer serializer, ServiceStack.Text.TypeConfig typeConfig, System.Reflection.PropertyInfo propertyInfo) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at ServiceStack.Text.Common.DeserializeTypeRef.GetTypeAccessorMap (ServiceStack.Text.TypeConfig typeConfig, ITypeSerializer serializer) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at ServiceStack.Text.Common.DeserializeType`1[ServiceStack.Text.Json.JsonTypeSerializer].GetParseMethod (ServiceStack.Text.TypeConfig typeConfig) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at ServiceStack.Text.Common.JsReader`1[ServiceStack.Text.Json.JsonTypeSerializer].GetCoreParseFn[Person] () [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at ServiceStack.Text.Common.JsReader`1[ServiceStack.Text.Json.JsonTypeSerializer].GetParseFn[Person] () [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at ServiceStack.Text.Json.JsonReader`1[MyLib.Person]..cctor () [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): --- End of inner exception stack trace --- E/MyApp(14494): at ServiceStack.Text.JsonSerializer.DeserializeFromString[Person] (System.String value) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at MyLib.Person.FromJson (System.String json, Boolean throwOnNullOrEmpty) [0x00000] in &lt;filename unknown&gt;:0 E/MyApp(14494): at MyApp.MainActivity.InitialiseUser () [0x00000] in &lt;filename unknown&gt;:0 </code></pre> <p>After this, my instance of Person is null.</p> <p>It seems from the output that the default constructor of Person can't be found (it has no explicitly defined constructor).</p> <p>Any help much appreciated.</p>
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    1. COActually, looking at the ServiceStack.Text code, it seems the linker might be messing up that assembly and not mine.
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