诺禾致源、Elasticsearch 入门（三）

GitHub仓库
https://github.com/elastic/elasticsearch-net
选择 Elasticsearch.Net 作为客户端
衔接方式
var node = new Uri(“http://myserver:9200”);
var config = new ConnectionConfiguration(node);
var client = new ElasticLowLevelClient(config);
var myJson = @"{ ““hello”” : ““world”” }";
client.Index(“myindex”, “1”, myJson);
var myJson = new { hello = “world” };
client.Index(“myindex”, “1”, PostData.Serializable(myJson));
Elasticsearch.Net 封装
新建 ElasticSearchClient类
public class ElasticSearchClient
{
public ElasticLowLevelClient Client { get; }
private readonly IConfiguration _configuration;
public ElasticSearchClient(IConfiguration configuration)
{
_configuration = configuration;
Client = InitClient();
}
#region Methods
public async Task Index(string index, string id, PostData body)
{
var response = await Client.IndexAsync(index, id, body);
ResponseValidate(response);
return response.Body;
}
public async Task SearchWithHighLight(string index, string query)
{
var response = await Client.SearchAsync(
index,
PostData.Serializable(new
{
from = 0,
size = 100,
query = new
{
match = new
{
content = query
}
},
highlight = new
{
pre_tags = new[] { “”, “” },
post_tags = new[] { “/”, “/” },
fields = new
{
content = new { }
}
}
}));
ResponseValidate(response);
var responseJson = (JObject)JsonConvert.DeserializeObject(response.Body);
var hits = responseJson[“hits”][“hits”] as JArray;
var result = new List();
foreach (var hit in hits)
{
var id = hit["_id"].ToObject();
result.Add(id);
}
return result;
}
public async Task Delete(string index, string id)
{
var response = await Client.DeleteAsync(index, id);
ResponseValidate(response);
}
#endregion
#region privates
private ElasticLowLevelClient InitClient()
{
var node = new Uri(_configuration.GetConnectionString(“ElasticSearch”));
var settings = new ConnectionConfiguration(node);
var client = new ElasticLowLevelClient(settings);
return client;
}
private void ResponseValidate(StringResponse response)
{
if (response.Success == false)
{
throw new ResultException(response.Body);
}
}
#endregion
}
依赖注入 Startup.csservices.AddScoped();
运用
private readonly ElasticSearchClient _elasticSearchClient;
await _elasticSearchClient.Index(Article.EsIndex, article.ArticleUID,PostData.Serializable(article));