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ASP.NET Web API 是一种框架，用于轻松构建可以访问多种客户端（包括浏览器和移动设备）的 HTTP 服务。 ASP.NET Web API 是一种用于在 .NET Framework 上构建 RESTful 应用程序的理想平台。
本文主要实现ASP.NET WebAPI 连接数据库获取数据，并以Json字符串格式返回。
1.创建ASP.NET Web Application(.NET Framework)项目；

2.选择Web API；

3.创建新项目完成；

在ValuesController.cs中修改Get方法并连接SQLServer数据库获取数据，以Json字符串格式返回：

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Web.Http;
using Newtonsoft.Json;namespace WebApplication1.Controllers
{public class ValuesController : ApiController{// GET api/valuespublic IEnumerable<string> Get(){return new string[] { "value1", "value2" };}// GET api/values/5public string Get(int id){try{SqlConnection sqlConnection =new SqlConnection("Data Source=127.0.0.1;Initial Catalog=GaryWeb;Integrated Security=True;User Id=sa;Password=123456");sqlConnection.Open();string sql = "select * from Users";DataSet dataSet = new DataSet();SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(sql, sqlConnection);sqlDataAdapter.Fill(dataSet);return JsonConvert.SerializeObject(dataSet);}catch (Exception ex){return ex.ToString();}}// POST api/valuespublic void Post([FromBody]string value){}// PUT api/values/5public void Put(int id, [FromBody]string value){}// DELETE api/values/5public void Delete(int id){}}
}

运行项目：

获得返回Json字符串数据：

{"Table": [{"UserID": 1, "UserName": "admin", "DisplayName": "admin1", "Password": "jZae727K08KaOmKSgOaGzww/XVqGr/PKEgIMkjrcbJI=", "Email": "289602025@qq.com", "Status": 0, "RegistrationTime": "2017/6/1", "LoginTime": null, "LoginIP": null}, {"UserID": 2, "UserName": "admin1", "DisplayName": "admin1", "Password": "jZae727K08KaOmKSgOaGzww/XVqGr/PKEgIMkjrcbJI=", "Email": "289602025@qq.com", "Status": 0, "RegistrationTime": "2017/6/1", "LoginTime": null, "LoginIP": null}, {"UserID": 3, "UserName": "admin2", "DisplayName": "admin2", "Password": "jZae727K08KaOmKSgOaGzww/XVqGr/PKEgIMkjrcbJI=", "Email": "289602025@qq.com", "Status": 0, "RegistrationTime": "2017/6/1", "LoginTime": null, "LoginIP": null}]
}