Connecting to SQL server from Restful C# service

问题

I am trying to develop a restful C# service with a connection to Microsoft SQL database. From what I understand, I am supposed to do the connection to the SQL server inside the following code:

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
namespace Webserver.Models
{
    public class WebserverContext : DbContext
    {


        public WebserverContext() : base("name=WebserverContext")
        {

        }

        public System.Data.Entity.DbSet<Webserver.Models.ApiModels.SecondlyReading> SecondlyReadings { get; set; }
    }
}

The issue that I am facing is that I am not sure how to do it. I have done db connection in C# ASP.NET before and the db connection is something like:

SqlConnection conn=new SqlConnection("Data source=localhost;"+"Initial Catalog=authors;user=myuser;password=mypassword")

I tried implementing it but it does not work. I have also referenced from the following link for db connection in C# Restful Service:

Link

Would appreciate any help.

回答1:

This may be a helpful start: https://msdn.microsoft.com/en-us/library/jj729737%28v=vs.113%29.aspx?f=255&MSPPError=-2147217396 but probably the step you are missing is having the connection string in your Web.Config.

ASP.Net Entity Framework will try to connect to a database instance whose connection string name in Web.Config matches the name of your context (e.g. WebserverContext, in your example above).

In your Web.Config, your ConnectionStrings element will have something along the following lines:

  <connectionStrings>
    <add name="WebserverContext" connectionString="Data Source=localhost;Initial Catalog=myWebserverContextDb;User ID=someuser;Password=somepassword" providerName="System.Data.SqlClient" />
  </connectionStrings>

Your DbContext class constructor needs to have that same name set so that it can look the connection string up. This tutorial might also help: https://www.tutorialspoint.com/entity_framework/entity_framework_dbcontext.htm

来源：https://stackoverflow.com/questions/45558507/connecting-to-sql-server-from-restful-c-sharp-service

标签

sql-server

entity-framework

web-services

connection-string