Question

我们有不同的客户，每个客户都拥有一个数据库。

客户端使用HttpHeader DatabaseOwner发送请求：Samsung

HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Add("DatabaseOwner", "Samsung");

在我的ApiController中，我希望我的Context基于该值并连接到正确的数据库

public class AuthController : ApiController
    {
        public CmpContext db { get; set; }

        public AuthController(): base()
        {

            db = new CmpContext(VcsCmpConnectionstring.GetCMPConnectionString(this.Request));
        }

        // GET api/Auth
        public IQueryable<DealerModel> GetDealer()
        {

            return db.Dealer;
        }

 public static string GetCMPConnectionString(HttpRequestMessage request) 
        {

            string returnvalue;

            if (request.Headers.Contains("DatabaseOwner"))
            {
                SqlConnectionStringBuilder ConnStringBuilder = new SqlConnectionStringBuilder(ConfigurationManager.ConnectionStrings["CMPContext"].ConnectionString);
                ConnStringBuilder.InitialCatalog = "vcs_cmp_" + request.Headers.GetValues("DatabaseOwner").First();
                returnvalue = ConnStringBuilder.ToString();
            }
            else 
            {
                throw new MissingFieldException("Header DatabaseOwneris null");
            }

            return returnvalue;
        }

当我尝试获取此请求时，它始终为空

什么时候可以访问请求，还是有更好的方法在数据库之间切换？

巴伐利亚州的问候帕特里克

Answer 1

请求对象仅在调用APIController的Initialize函数后初始化。因此，在调用base.initialize之前，您无法访问Request。试着这样做：

public class AuthController : ApiController
    {
        protected override void Initialize(
        System.Web.Http.Controllers.HttpControllerContext controllerContext)
        {            
            base.Initialize(controllerContext);
            db = new CmpContext(
            VcsCmpConnectionstring.GetCMPConnectionString(this.Request));
        }
    }

与HeaderValue相关的WebApi Switch Connectionstring - Request为null

1 个答案: