MvvmCross 5.4在ConsoleLogProvider上使用NullRef启动应用时崩溃 [英] MvvmCross 5.4 Crash on app startup with NullRef at ConsoleLogProvider

问题描述

我已经将Xamarin.Android应用程序包MvvmCross从5.3.2更新到了5.4，并且应用程序在启动时开始崩溃.我手动确定原因是链接器-我启用了link SDK libs only选项.使用None选项，它可以很好地工作，但包装要大一倍.

I've updated my Xamarin.Android app package MvvmCross from 5.3.2 to 5.4 and app start crashing on startup. Manually I identified that the reason is the linker - I have link SDK libs only option enabled. With the None option it works just fine but makes a twice bigger package.

"MvvmCross.Core.Platform.LogProviders.ConsoleLogProvider"的类型初始值设定项引发了异常. ---> System.NullReferenceException:对象引用未设置为对象的实例

The type initializer for 'MvvmCross.Core.Platform.LogProviders.ConsoleLogProvider' threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object

推荐答案

这是MvvmCross 5.4中的一个已知错误，将在下一版本中修复.

This is a known bug in MvvmCross 5.4 and will be fixed in the next version.

同时，作为一种变通办法，您可以转到您的Setup类并覆盖GetDefaultLogProviderType，以便它返回MvxLogProviderType.None，如下所示:

In the meantime, as a work around, you can go to your Setup class and override GetDefaultLogProviderType so it returns MvxLogProviderType.None, like this:

protected override MvxLogProviderType GetDefaultLogProviderType() 
    => MvxLogProviderType.None;

编辑

由于提供程序依赖于反射，因此如果要将控制台提供程序与IMvxLog一起使用，只需在LinkerPleaseInclude.cs中将其包括在内:

Since the providers rely on reflection, if you wanna use the Console provider with IMvxLog, simply include this in your LinkerPleaseInclude.cs:

using System;

//[...]

public void Include(ConsoleColor color)
{
    Console.Write("");
    Console.WriteLine("");
    color = Console.ForegroundColor;
    Console.ForegroundColor = ConsoleColor.Red;
    Console.ForegroundColor = ConsoleColor.Yellow;
    Console.ForegroundColor = ConsoleColor.Magenta;
    Console.ForegroundColor = ConsoleColor.White;
    Console.ForegroundColor = ConsoleColor.Gray;
    Console.ForegroundColor = ConsoleColor.DarkGray;
}

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