我有一个使用.NET Core 3.1的默认Web api模板项目,并且已经在startup.cs
上注册了Elastic Search NEST。但是当我加载它时,它在Singleton ImplementationType: Unable to resolve service for type 'Nest.IElasticClient' while attempting to activate
中的program.cs
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
这是我的startup.cs public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddControllers();
services.AddSingleton<IProductService, ESProductService>();
services.Configure<ProductSettings>(Configuration.GetSection("product"));
services.AddElasticsearch(Configuration);
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
}
下面是ElasticsearchExtensions
扩展类public static class ElasticsearchExtensions
{
public static void AddElasticsearch(this IServiceCollection services, IConfiguration configuration)
{
var url = configuration["elasticsearch:url"];
var defaultIndex = configuration["elasticsearch:index"];
var settings = new ConnectionSettings(new Uri(url))
.DefaultIndex(defaultIndex);
AddDefaultMappings(settings);
var client = new ElasticClient(settings);
services.AddSingleton(client);
CreateIndex(client, defaultIndex);
}
private static void AddDefaultMappings(ConnectionSettings settings)
{
settings
.DefaultMappingFor<Product>(m => m
.Ignore(p => p.Price)
.Ignore(p => p.Quantity)
.Ignore(p => p.Rating)
);
}
private static void CreateIndex(IElasticClient client, string indexName)
{
var createIndexResponse = client.Indices.Create(indexName,
index => index.Map<Product>(x => x.AutoMap())
);
}
}
最佳答案
问题解决了。 AddSingleton错过了界面。 services.AddSingleton<IElasticClient>(client);
关于c# - Singleton ImplementationType:尝试激活时无法解析 'Nest.IElasticClient'类型的服务,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/63786420/