c# - "' HttpRequestMessageProperties ' does not contain a definition for ' PathHandler '"尽管使用 System.Web.Odata.Extensions

Question

我目前正在学习如何使用 MS's ASP.NET web API guide 创建 OData 服务.在 Helpers 部分，尝试获取字段 HttpRequestMessage.ODataProperties().PathHandler 或 ...Model 会引发上述错误。根据MS's documentation , import System.Web.OData.Extensions 应该是对的。

使用 6.13.0 for Odata.Client 和 7.0.0 for Odata.Core。

相关代码，基本和web api指南1:1:

using Microsoft.OData;
using Microsoft.OData.UriParser;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Web.Http.Routing;
using System.Web.OData.Extensions;

namespace WebApiGuide {
public static class Helpers
{
    public static TKey GetKeyFromUri<TKey>(HttpRequestMessage Request, Uri uri)
    {
        if (uri == null)
        {
            throw new ArgumentNullException("uri");
        }

        var urlHelper = Request.GetUrlHelper() ?? new UrlHelper(Request);

        string serviceRoot = urlHelper.CreateODataLink(
            Request.ODataProperties().RouteName,
            Request.ODataProperties().PathHandler, new List<ODataPathSegment>());
        var odataPath = Request.ODataProperties().PathHandler.Parse(
            Request.ODataProperties().Model,
            serviceRoot, uri.LocalPath);

        var keySegment = odataPath.Segments.OfType<KeyValuePathSegment>().FirstOrDefault();
        if (keySegment == null)
        {
            throw new InvalidOperationException("The link does not contain a key");
        }

        var value = ODataUriUtils.ConvertFromUriLiteral(keySegment.Value, ODataVersion.V4);
        return (TKey)value;
    }
}
}

编辑:如果它使问题更具体，我对 System.Web.OData.Routing 中的 KeyValuePathSegment 也有同样的问题

Answer 1

对于出于与我相同的原因最终来到这里的其他人，这是我的代码(显然 keySegment 也发生了变化，Value 包含已经转换的对象):

public static TKey GetKeyFromUri<TKey>(HttpRequestMessage request, Uri uri)
{
    if (uri == null)
    {
        throw new ArgumentNullException(nameof(uri));
    }

    var urlHelper = request.GetUrlHelper() ?? new UrlHelper(request);
    var serviceRoot = urlHelper.CreateODataLink(request.ODataProperties().RouteName, request.GetPathHandler(), new List<ODataPathSegment>());
    var odataPath = request.GetPathHandler().Parse(serviceRoot, uri.LocalPath, request.GetRequestContainer());

    var keySegment = odataPath.Segments.OfType<KeySegment>().FirstOrDefault();
    if (keySegment?.Keys?.FirstOrDefault() == null)
    {
        throw new InvalidOperationException("The link does not contain a key.");
    }

    return (TKey)keySegment.Keys.First().Value;
}