c# - 如何从 ContentPage 获取应用版本？

Question

我试过这个:iPhone MonoTouch - Get Version of Bundle

NSBundle.MainBundle.ObjectForInfoDictionary("CFBundleVersion").ToString();

但这没有用。因为找不到 NSBundle。

如何从 ContentPage 获取应用程序版本(iOS 和 Android)？

我最终得到的代码(感谢 Steven Thewissen):

PCL(共享代码)

using System;
namespace MyApp.Interfaces
{
    public interface IApplicationVersion
    {
        string ApplicationsPublicVersion { get; set; }
        string ApplicationsPrivateVersion { get; set; }
    }
}

安卓

using System;
using MyApp.Droid.Helpers;
using MyApp.Interfaces;
using Xamarin.Forms;

[assembly: Dependency(typeof(ApplicationVersion))]
namespace MyApp.Droid.Helpers
{
    public class ApplicationVersion : IApplicationVersion
    {
        public string ApplicationsPublicVersion { get; set; }
        public string ApplicationsPrivateVersion { get; set; }

        public ApplicationVersion()
        {
            var context = Android.App.Application.Context;
            var info = context.PackageManager.GetPackageInfo(context.PackageName, 0);

            ApplicationsPublicVersion = info.VersionName;
            ApplicationsPrivateVersion = info.VersionCode.ToString();
        }
    }
}

iOS

using System;
using MyApp.Interfaces;
using MyApp.iOS.Helpers;
using Foundation;
using Xamarin.Forms;

[assembly: Dependency(typeof(ApplicationVersion))]
namespace MyApp.iOS.Helpers
{
    public class ApplicationVersion : IApplicationVersion
    {
        public string ApplicationsPublicVersion { get; set; }
        public string ApplicationsPrivateVersion { get; set; }

        public ApplicationVersion()
        {
            ApplicationsPublicVersion = NSBundle.MainBundle.InfoDictionary[new NSString("CFBundleShortVersionString")].ToString();
            ApplicationsPrivateVersion = NSBundle.MainBundle.InfoDictionary[new NSString("CFBundleVersion")].ToString();
        }
    }
}

Answer 1

您可以通过实现依赖服务来做到这一点。首先，您在共享代码中定义一个接口(interface):

namespace MyApp
{
    public interface IAppVersionProvider
    {
        string AppVersion { get; }
    }
}

然后在每个平台项目中实现接口(interface)。

iOS

[assembly: Dependency(typeof(AppVersionProvider))]
namespace MyApp.iOS
{
    public class AppVersionProvider : IAppVersionProvider
    {
        public string AppVersion => NSBundle.MainBundle.InfoDictionary[new NSString("CFBundleVersion")].ToString();
    }
}

安卓

[assembly: Dependency(typeof(AppVersionProvider))]
namespace MyApp.Droid
{
    public class AppVersionProvider : IAppVersionProvider
    {
        public string AppVersion
        {
            get
            {
                var context = Android.App.Application.Context;
                var info = context.PackageManager.GetPackageInfo(context.PackageName, 0);

                return $"{info.VersionName}.{info.VersionCode.ToString()}";
            }
        }
    }
}

然后您可以通过以下方式从共享代码中检索版本号:

var version = DependencyService.Get<IAppVersionProvider>();
var versionString = version.AppVersion;