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用 【NEST】 在C#中操作ElasticSearch

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互联网集市收集整理的这篇技术教程文章主要介绍了用 【NEST】 在C#中操作ElasticSearch，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含4848字，纯文字阅读大概需要7分钟。

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准备工作： VSCode开发环境，在终端控制台（Ctrl+~）输入命令 dotnet add package Nest 安装NEST包，安装好后打开项目的.csproj文件如下图。

技术分享图片

一、索引数据：

             1
            using
             Nest;

             2
            using
             System;

             3
             4
            namespace
             NetCoreFirst

             5
            {

             6
            public
            class
             ImportES

             7
                {

             8
            public
            static
            string
             ElasticsearchMethod()

             9
                    {

            10
            //
            1.通过es服务器 localhost:9200 来定义es client
            11
            var node = new Uri("http://localhost:9200");
12var indexName = "esbot";
13var settings = new ConnectionSettings(node).DefaultIndex(indexName);
14var elastic = new ElasticClient(settings);
1516//es服务器健康检查17var res = elastic.ClusterHealth();
18            Console.WriteLine(res.Status);
1920//2.创建索引esbot21if (!elastic.IndexExists(indexName).Exists)
22            {
23var createIndexResponse = elastic.CreateIndex(indexName);
24var mappingBlogPost = elastic.Map<Resume>(s => s.AutoMap());
25            }
2627//3.构造数据28string[] nameArray = {"Cody", "Blake", "Dennis", "Evan ", "Harris", "Jason ", "Lambert ", "Louis ", "Milton ", "Cody" };
29string[] skillArray = {"c#", "c++", "java", "python", "php", "Linux", "ruby", "matlab", "perl", "powershell" };
30long[] ageRange = { 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 };
31for(int i=0; i< 10;i++)
32            {
33var resume = new Resume
34                {
35                     Id= Guid.NewGuid(),
36                     Name=nameArray[i],
37                     Age=ageRange[i],
38                     Skills="My skill is Azure and " + skillArray[i]
39                };
40//4.导入数据到索引41                 IIndexResponse bulkIndexResponse = elastic.Index(resume, p => p.Type(typeof(Resume)).Id(i).Refresh(null));
42            }
4344//5. 简单搜索45var searchResult = elastic.Search<Resume>(sr => sr.Query(q => q.MatchAll()));
46// System.Console.WriteLine(searchResult.Hits.Count);
47// System.Console.ReadLine();48var resumesCount = searchResult.Hits.Count.ToString();
49return resumesCount;
50        }
51    }
52 }

Resume类的定义：

技术分享图片 技术分享图片 
                 1
                using
                 Nest;

                 2
                using
                 System;

                 3
                 4
                namespace
                 NetCoreFirst

                 5
                {

                 6     [ElasticsearchType(Name="candidate", IdProperty="Id")]
 7publicclass Resume
 8    {
 9         [Text(Name="id", Index=false)]
10public Guid? Id { get; set; }
1112         [Text(Name="name", Index=true)]
13publicstring Name { get; set; }
1415         [Text(Name="age", Index=false)]
16publiclong Age { get; set; }
1718         [Text(Name="skills", Index=true)]
19publicstring Skills { get; set; }
20    }
21 }
View Code

 

二、搜索数据

             1
            using
             Nest;

             2
            using
             System;

             3
             4
            namespace
             NetCoreFirst

             5
            {

             6
            public
            class
             SearchES

             7
                {

             8
            public
            static
            string indexName="bank";
 9publicstatic Uri node = new Uri("http://localhost:9200");
10publicstatic ConnectionSettings settings = new ConnectionSettings(node).DefaultIndex(indexName);
11publicstatic ElasticClient elastic = new ElasticClient(settings);
1213publicstatic ISearchResponse<Bank> SearchNumber()
14        {
15string dictionaryKey = "balance";
16var dictionary = Extension.BankDictionary();
17var rangeField = dictionary[dictionaryKey];
18var gt = 40000;
19var lt = 40100;
20var searchResponse = elastic.Search<Bank>(es => es.Query(q => 
21                     q.Range(r => r.Name("").Field(rangeField).GreaterThan(gt).LessThan(lt).Boost(2.0))));
22return searchResponse;
23        }
2425publicstatic ISearchResponse<Bank> SearchString()
26        {
27string queryStr = "";
28var searchResponse = elastic.Search<Bank>(es => es.Query(q => 
29                     q.QueryString(qs => qs.Query(queryStr))));
30return searchResponse;
31        }
3233publicstatic ISearchResponse<Bank> SearchField()
34        {
35string queryStr = "35";
36string dictionaryKey = "age";
37var dictionary = Extension.BankDictionary();
38var rangeField = dictionary[dictionaryKey];
39var searchResponse = elastic.Search<Bank>(es => es.Query(q => 
40                     q.Match(m => m.Field(rangeField).Query(queryStr))));
41return searchResponse;
42        }
43    }
44 }
Extension类和Bank类的定义
技术分享图片 技术分享图片 
                 1
                public
                class
                 Extension

                 2
                    {

                 3
                public
                static Dictionary<string, Expression<Func<Resume,object>>> ResumeDictionary()
 4        {
 5returnnew Dictionary<string, Expression<Func<Resume, object>>>
 6            {
 7                 {"age", p=>p.Age},
 8                 {"name", p=>p.Name}
 9            };
10        }
1112publicstatic Dictionary<string, Expression<Func<Bank, object>>> BankDictionary()
13        {
14returnnew Dictionary<string, Expression<Func<Bank, object>>>
15            {
16                 {"account_number", p => p.account_number},
17                 {"age", p => p.age},
18                 {"balance", p => p.balance}
19            };
20        }
21    }
2223     [ElasticsearchType(Name="account", IdProperty="Id")]
24publicclass Bank
25    {
26publiclong account_number {get;set;}
27publicstring address { get; set; }
28publiclong age { get; set; }
29publiclong balance { get; set; }
30publicstring city { get; set; }
31publicstring email { get; set; }
32publicstring employer { get; set; }
33publicstring firstname { get; set; }
34publicstring gender { get; set; }
35publicstring lastname { get; set; }
36publicstring state { get; set; }
37     }
View Code

 

 

 

 

 *****************************
 *** Keep learning and growing. ***
 *****************************

原文：https://www.cnblogs.com/gangle/p/9337472.html

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