如何以字典的形式访问所有查询字符串参数

Question

我有一些动态查询字符串参数,我想与之交互IDictionary<string,string>.我该怎么做呢？

我试过了

public IHttpActionResult Get(FromUri]IDictionary<string, string> selections)

如建议但查询

/api/MyController?selections%5Bsub-category%5D=kellogs

它总是给我一个0项的字典.

我甚至不需要selections前缀.我确实需要所有的查询字符串参数作为字典.我该怎么做以及为什么上述工作不顺利？

Answer 1

您可以使用GetQueryNameValuePairs扩展方法上HttpRequestMessage得到解析的查询字符串键值对的集合.

public IHttpActionResult Get()
{
    var queryString = this.Request.GetQueryNameValuePairs();
}

您可以创建一些进一步的扩展方法,使其可以使用,如下所述:WebAPI:获取标题,QueryString和Cookie值

/// <summary>
/// Extends the HttpRequestMessage collection
/// </summary>
public static class HttpRequestMessageExtensions
{
    /// <summary>
    /// Returns a dictionary of QueryStrings that's easier to work with 
    /// than GetQueryNameValuePairs KevValuePairs collection.
    /// 
    /// If you need to pull a few single values use GetQueryString instead.
    /// </summary>
    /// <param name="request"></param>
    /// <returns></returns>
    public static Dictionary<string, string> GetQueryStrings(
        this HttpRequestMessage request)
    {
         return request.GetQueryNameValuePairs()
                       .ToDictionary(kv => kv.Key, kv=> kv.Value, 
                            StringComparer.OrdinalIgnoreCase);
    }
}