如何在ASP.NET Web API项目而不是.NET Core上使用DI

Question

以下文档显示了如何为.net核心项目配置cosmonaut。

https://github.com/Elfocrash/Cosmonaut

Registering the CosmosStores in ServiceCollection for DI support

 var cosmosSettings = new CosmosStoreSettings("<<databaseName>>", "<<cosmosUri>>", "<<authkey>>");

serviceCollection.AddCosmosStore<Book>(cosmosSettings);

//or just by using the Action extension

serviceCollection.AddCosmosStore<Book>("<<databaseName>>", "<<cosmosUri>>", "<<authkey>>", settings =>
{
    settings.ConnectionPolicy = connectionPolicy;
    settings.DefaultCollectionThroughput = 5000;
    settings.IndexingPolicy = new IndexingPolicy(new RangeIndex(DataType.Number, -1),
        new RangeIndex(DataType.String, -1));
});

我如何处理旧的webpi项目？

Answer 1

Web Api 2并没有开箱即用的依赖项注入，您可以使用Autofac和Ninject等第三方依赖项注入包，或者如果您根本不想使用依赖项注入，也可以创建Cosmonaut的singleton类以供使用。 。

注意：根据他们的文档 ，Cosmonaut实例应用作每个实体的单例实例。

更新

通用Singleton类的实现，其中T是您要查询其实例的实体的类型，

public sealed class CosmosStoreSingleton<T>
{
    private static ICosmosStore<T> instance = null;

    public static ICosmosStore<T> Instance
    {
        get
        {
            if (instance==null)
            {
                var cosmosSettings = new CosmosStoreSettings("<<databaseName>>", "<<cosmosUri>>", "<<authkey>>");
                instance = new CosmosStore<T>(cosmosSettings);
            }

            return instance;
        }
    }
}