如何以字典的形式访问所有查询字符串参数 [英] How to access all querystring parameters as a dictionary

问题描述

我有一些动态查询字符串参数，我想将它们作为 IDictionary 进行交互.我该怎么做?

I have some dynamic querystring parameters that I would like to interact with as an IDictionary<string,string>. How do I do this?

我试过了

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

按照建议 但对于

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

它总是给我一本包含 0 个条目的字典.

it always gives me a dictionary with 0 items.

我什至不需要 selections 前缀.我真的只需要所有查询字符串参数作为字典.我该怎么做，为什么上述方法不起作用?

I don't even need the selections prefix. I literally just need all querystring parameters as a dictionary. How do I do this and why won't the above work?

推荐答案

您可以使用 HttpRequestMessage 上的GetQueryNameValuePairs 扩展方法 以获取解析的查询字符串作为键值集合对.

You can use the GetQueryNameValuePairs extension method on the HttpRequestMessage to get the parsed query string as a collection of key-value pairs.

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

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

And you can create some further extension methods to make it eaiser to work with as described here: WebAPI: Getting Headers, QueryString and Cookie Values

/// <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);
    }
}

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