Question

在我有一个项目列表的地方编写示例应用程序，然后当用户点击某个项目时 - 它使用ShowViewModel显示有关该项目的详细信息页面。但是，当调用调用ShowViewModel的方法时，它会崩溃并出现以下错误： “无法使用令牌01000037解析类型（来自typeref，类/汇编MvvmCross.Core.ViewModels.MvxRequestedBy ......“

示例应用的代码在这里： https://github.com/gregmercer/FruitsAndVeggies

完整的错误消息在这里： https://github.com/gregmercer/FruitsAndVeggies/blob/master/error.txt

在此处找到导致错误的行（取消注释时）： https://github.com/gregmercer/FruitsAndVeggies/blob/master/FruitsAndVeggies.Core/ViewModels/FruitsViewModel.cs#L58

Answer 1

问题是你正在混合使用MvvmCross版本。

因此，如果你看看你的core.config为你的核心：

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="MvvmCross" version="4.4.0" targetFramework="portable45-net45+win8+wpa81" />
  <package id="MvvmCross.Binding" version="4.4.0" targetFramework="portable45-net45+win8+wpa81" />
  <package id="MvvmCross.Core" version="4.4.0" targetFramework="portable45-net45+win8+wpa81" />
  <package id="MvvmCross.Platform" version="4.4.0" targetFramework="portable45-net45+win8+wpa81" />
</packages>

这些是版本4.4.0

然后，如果我们看看Droid项目：

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="MvvmCross" version="5.0.2" targetFramework="monoandroid70" />
  <package id="MvvmCross.Binding" version="5.0.2" targetFramework="monoandroid70" />
  <package id="MvvmCross.Core" version="5.0.2" targetFramework="monoandroid70" />
  <package id="MvvmCross.Droid.Shared" version="5.0.2" targetFramework="monoandroid70" />
  <package id="MvvmCross.Droid.Support.Core.UI" version="5.0.2" targetFramework="monoandroid70" />
  <package id="MvvmCross.Droid.Support.Fragment" version="5.0.2" targetFramework="monoandroid70" />
  <package id="MvvmCross.Droid.Support.V7.AppCompat" version="5.0.2" targetFramework="monoandroid70" />
  <package id="MvvmCross.Droid.Support.V7.RecyclerView" version="5.0.2" targetFramework="monoandroid70" />
  <package id="MvvmCross.Platform" version="5.0.2" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Animated.Vector.Drawable" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Annotations" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Compat" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Core.UI" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Core.Utils" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Design" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Fragment" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Media.Compat" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Transition" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.v7.AppCompat" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.v7.RecyclerView" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Vector.Drawable" version="25.3.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Build.Download" version="0.4.3" targetFramework="monoandroid70" />
</packages>

这些是版本5.0.2，比4.4.0更新。

合并您的软件包并在所有项目中使用相同的版本。

Answer 2

要传递参数，您需要从通用MvxViewModel< Parameters>继承或更新到MvvmCross 5.0，这样可以更好地支持传递对象。

将此示例视为参考：https://github.com/MvvmCross/MvvmCross/tree/develop/TestProjects/Navigation

调用ShowViewModel时出错

2 个答案: