在.Net Core 3.1中創建一個HttpRequest實例

Question

我必須使用 GET 動詞和 Uri 創建一個HttpRequest實例，才能將 object 傳遞給OdataQueryOptions 。

下面是 c# 中的示例代碼。 我需要在 Dotnet core 3.1 中進行轉換。

[EnableQuery]
   public class MyEnableQueryAttribute : EnableQueryAttribute
    {
        public override IQueryable ApplyQuery(IQueryable queryable, ODataQueryOptions queryOptions)
        {
            //IQueryable result = default(IQueryable);

            // get the original request before the alterations
            var originalRequest = queryOptions.Request.QueryString;

            // get the original URL before the alterations
            string url = originalRequest.Value;

            if (queryOptions.Filter != null && url.Contains("$filter=indexof%28Type,%27PRIMARY%27%29%20ne%20-1"))
            {
                url = url.Replace("$filter=indexof%28Type,%27PRIMARY%27%29%20ne%20-1", "$filter=indexof%28Type,%27toupper%28PRIMARY%28%27%29%20ne%20-1");
                //var context = new HttpContext()
                //HttpRequestMessageFeature request = new HttpRequestMessageFeature(context);
                //HttpRequestMessage req = request.HttpRequestMessage;

                queryOptions = new ODataQueryOptions(queryOptions.Context, Req);
            }

            return queryOptions.ApplyTo(queryable, );
        }
    }

下面的行給出了錯誤。 它需要HttpRequest類型的 object 。

queryOptions = new ODataQueryOptions(queryOptions.Context, Req);

Answer 1

ODataQueryOptions采用 ASP.NET 請求類型HttpRequest ，可從 controller 中的HttpContext.Request獲得。

[EnableQuery]
[HttpGet]
public IQueryable<Product> GetProducts(ODataQueryOptions<Product> queryOptions)
{
    if (queryOptions.Filter != null)
    {
        queryOptions = new ODataQueryOptions<Product>(
           queryOptions.Context, 
           HttpContext.Request); // here!!!
    }

    IQueryable query = queryOptions.ApplyTo(db.Products.AsQueryable());
    return query as IQueryable<Product>;
}