创建一个基本的xamarin项目

Question

我正在尝试开发一些xamarin.我正在使用以下Visual Studio版本:

Microsoft Visual Studio Enterprise 2017版本15.5.2 VisualStudio.15.Release/15.5.2 + 27130.2010 Microsoft .NET Framework版本4.7.02556

我添加了一个新的Xamarin项目,并在下面得到错误(不添加任何代码).我试着没有运气重新安装Xamarin.有想法该怎么解决这个吗:

严重级代码描述项目文件行抑制状态错误CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 12活动错误CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 12活动错误CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 12活动错误CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 13活动错误CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 15 Active Error CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 17活动错误CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 18 Active Error CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 20 Active Error CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 22 Active Error CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 23 Active Error CS0012"AppCompatActivity"类型在未引用的程序集中定义.您必须添加对程序集'Xamarin.Android.Support.v7.AppCompat,Version = 1.0.0.0,Culture = neutral,PublicKeyToken = null'的引用.App4.Android C:\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 23 Active Error NU1202 Package Xamarin.Android.Support.v7.MediaRouter 25.4.0.2不兼容monoandroid60(MonoAndroid,Version = v6.0).包Xamarin.Android.Support.v7.MediaRouter 25.4.0.2支持:monoandroid70(MonoAndroid,Version = v7.0)
错误NU1202包Xamarin.Android.Support.v7.CardView 25.4.0.2与monoandroid60不兼容(MonoAndroid,Version = V6.0).包Xamarin.Android.Support.v7.CardView 25.4.0.2支持:monoandroid70(MonoAndroid,Version = v7.0)
错误NU1202包Xamarin.Android.Support.v7.AppCompat 25.4.0.2与monoandroid60不兼容(MonoAndroid,Version = V6.0).包Xamarin.Android.Support.v7.AppCompat 25.4.0.2支持:monoandroid70(MonoAndroid,Version = v7.0)
错误NU1202包Xamarin.Android.Support.v4 25.4.0.2与monoandroid60不兼容(MonoAndroid,Version = v6. 0).包Xamarin.Android.Support.v4 25.4.0.2支持:monoandroid70(MonoAndroid,Version = v7.0)
错误NU1202包Xamarin.Android.Support.Design 25.4.0.2与monoandroid60不兼容(MonoAndroid,Version = v6.0) .包Xamarin.Android.Support.Design 25.4.0.2支持:monoandroid70(MonoAndroid,Version = v7.0)
错误CS1503参数1:无法从'App4.Droid.MainActivity'转换为'Android.Content.Context'App4.Android C :\ Users\thomaseg\Documents\Visual Studio 2017\Projects\App4\App4\App4.Android\MainActivity.cs 22 Active

Answer 1

您更新了所有软件包吗？我不久前收到此错误，更新它们为我修复了它（工具 -> NuGet 包管理器 -> 管理解决方案的 NuGet 包 -> 更新，然后更新全部）