是否可以在控制器外部的运行时获取路由数据?

问题描述

我想知道是否有可能以某种方式在控制器之外获取路由值?

这是我尝试过的.我也尝试做.Values["{projectId}"];，但我仍然得到null.

[RoutePrefix("projects")]
public class UsergroupController : ApiController
{
    [Route("{projectId}/usergroups"), HttpGet]
    public IHttpActionResult Get()
    {
        // Url: /projects/123/usergroups
        // Response: null
        var projectId = HttpContext.Current.Request.RequestContext.RouteData.Values["projectId"];
        return Ok(projectId);
    }
}

我发现它位于，但是非常奇怪.也许可能会有某种LINQ查询来获取它?

RouteData-Values-Values-0-0-Values-0

解决方案

WebApi具有它自己的嵌套RouteData，这是因为它不使用System.Web中的RouteData类，而是它自己的HttpRouteData类./p>

WebApi路由在键MS_SubRoutes下添加一个条目，WebApi将其用于内部路由.

我写了一个扩展方法，将WebApi路由数据展平为string/object字典，这在RouteData.Values

中可能会看到

WebApiExtensions.cs

public static class WebApiExtensions
{
    public static IDictionary<string, object> GetWebApiRouteData(this RouteData routeData)
    {
        if (!routeData.Values.ContainsKey("MS_SubRoutes"))
            return new Dictionary<string,object>();

        return ((IHttpRouteData[])routeData.Values["MS_SubRoutes"]).SelectMany(x => x.Values).ToDictionary(x => x.Key, y => y.Value);
    }
}

用法:

[RoutePrefix("projects")]
public class UsergroupController : ApiController
{
    [Route("{projectId}/usergroups"), HttpGet]
    public IHttpActionResult Get()
    {
        // Url: /projects/123/usergroups
        // Response: null
        object value = null;

        var webApiRouteData = HttpContext.Current.Request.RequestContext.RouteData.GetWebApiRouteData();
        value = webApiRouteData["projectId"];

        return Ok(value);
    }
}

I wonder if it's possible to somehow get the route value outside of controller?

This is what I've tried. I also tried to do .Values["{projectId}"]; but I still get null.

[RoutePrefix("projects")]
public class UsergroupController : ApiController
{
    [Route("{projectId}/usergroups"), HttpGet]
    public IHttpActionResult Get()
    {
        // Url: /projects/123/usergroups
        // Response: null
        var projectId = HttpContext.Current.Request.RequestContext.RouteData.Values["projectId"];
        return Ok(projectId);
    }
}

I found that it is located, but in a very strange matter. Maybe there might be some kind of LINQ query to get it?

RouteData-Values-Values-0-0-Values-0

解决方案

WebApi has it's own nested RouteData, this is because it doesn't use the RouteData class in System.Web but it's own HttpRouteData class.

The WebApi routing adds an entry under the key MS_SubRoutes, which WebApi uses for it's internal routes.

I've written an extension method which flattens the WebApi route data into a string/object dictionary, which is what you might see in RouteData.Values

WebApiExtensions.cs

public static class WebApiExtensions
{
    public static IDictionary<string, object> GetWebApiRouteData(this RouteData routeData)
    {
        if (!routeData.Values.ContainsKey("MS_SubRoutes"))
            return new Dictionary<string,object>();

        return ((IHttpRouteData[])routeData.Values["MS_SubRoutes"]).SelectMany(x => x.Values).ToDictionary(x => x.Key, y => y.Value);
    }
}

Usage:

[RoutePrefix("projects")]
public class UsergroupController : ApiController
{
    [Route("{projectId}/usergroups"), HttpGet]
    public IHttpActionResult Get()
    {
        // Url: /projects/123/usergroups
        // Response: null
        object value = null;

        var webApiRouteData = HttpContext.Current.Request.RequestContext.RouteData.GetWebApiRouteData();
        value = webApiRouteData["projectId"];

        return Ok(value);
    }
}

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