HttpClient post call 适用于邮递员，但不适用于 C#答案

【问题标题】：HttpClient post call works on postman but not C#HttpClient post call 适用于邮递员，但不适用于 C#
【发布时间】：2020-10-25 04:49:23
【问题描述】：

正如标题所说，我的 post-call 可以在 postman 中工作，但不能在 c# 中工作。无论我尝试什么，它都无法在我的 c# 代码中运行。

这是我的代码：

internal async Task<(string, int)> GetJsonFileFromApiCall(string query)
    {
        var _client = new HttpClient();
        var apiUrl = "https://wf19vv0nsf-dsn.algolia.net/1/indexes/*/queries?x-algolia-agent=Algolia%20for%20vanilla%20JavaScript%20(lite)%203.27.0%3Binstantsearch.js%202.10.2%3BMagento2%20integration%20(1.12.1)%3BJS%20Helper%202.26.0&x-algolia-application-id=WF19VV0NSF&x-algolia-api-key=MDdmNjA0Mjc1YzRkZjI4MWMwZmQyMDI4MDc5NDY4ZjlkYzJmOTVmMWY5Yjc3MGFkNDRiODA4YjU0MDVlM2Q1YnRhZ0ZpbHRlcnM9";
        var load = new { Requests = new { IndexName = "magento2_tcg_productiondefault_products", Params = $"query={query}&hitsPerPage=12&maxValuesPerFacet=8&page=0&highlightPreTag=__ais-highlight__&highlightPostTag=__%2Fais-highlight__&ruleContexts=%5B%22magento_filters%22%2C%22%22%5D&facets=%5B%22mtg_setcode%22%2C%22is_foil%22%2C%22mtg_rarity%22%2C%22sf_colours%22%2C%22sf_types%22%2C%22sf_legalities%22%2C%22price.AUD.default%22%2C%22stock_qty%22%2C%22mtg_cmc%22%5D&numericFilters=%5B%22visibility_search%3D1%22%5D" } };

        var message = await _client.PostAsync(apiUrl, GetStringContent(load));
        message.EnsureSuccessStatusCode();
        
        var jToken = JObject.Parse(await message.Content.ReadAsStringAsync());
        
        //temp return
        return ("", 1);
    } 

    private static StringContent GetStringContent<T>(T load)
    {
        var serializeObject = JsonConvert.SerializeObject(load, new JsonSerializerSettings { ContractResolver = new CamelCasePropertyNamesContractResolver() });
        return new StringContent(serializeObject, Encoding.UTF8, "application/json");
    }

这是我的邮递员截图：

需要注意的一点是，post 请求在进行 post 调用时会接收表单数据。

【问题讨论】：

httpclient 代码在哪里？ headers 设置在哪里？ stackoverflow.com/help/minimal-reproducible-example
我已经添加了 httpclient 代码。我不太清楚标题设置是什么意思（对此有点新）
对于那些试图帮助你的人来说，“不起作用”也不是很具描述性。
目前的反应是什么？你有例外吗？你得到一个空的回应？我认为该错误是由 URI 的格式化方式引起的。您可能需要使用 HttpUtility.UrlEncode() 来更好地格式化您的 URI
有错误吗？

标签： c# json postman httpclient dotnet-httpclient

【解决方案1】：

我认为你应该更改这行代码

var load = new { Requests = new { IndexName = "magento2_tcg_productiondefault_products", Params = $"query={query}&hitsPerPage=12&maxValuesPerFacet=8&page=0&highlightPreTag=__ais-highlight__&highlightPostTag=__%2Fais-highlight__&ruleContexts=%5B%22magento_filters%22%2C%22%22%5D&facets=%5B%22mtg_setcode%22%2C%22is_foil%22%2C%22mtg_rarity%22%2C%22sf_colours%22%2C%22sf_types%22%2C%22sf_legalities%22%2C%22price.AUD.default%22%2C%22stock_qty%22%2C%22mtg_cmc%22%5D&numericFilters=%5B%22visibility_search%3D1%22%5D" } };

到这里：

var load = new { Requests = new[] {new  { IndexName = "magento2_tcg_productiondefault_products", Params = $"query={query}&hitsPerPage=12&maxValuesPerFacet=8&page=0&highlightPreTag=__ais-highlight__&highlightPostTag=__%2Fais-highlight__&ruleContexts=%5B%22magento_filters%22%2C%22%22%5D&facets=%5B%22mtg_setcode%22%2C%22is_foil%22%2C%22mtg_rarity%22%2C%22sf_colours%22%2C%22sf_types%22%2C%22sf_legalities%22%2C%22price.AUD.default%22%2C%22stock_qty%22%2C%22mtg_cmc%22%5D&numericFilters=%5B%22visibility_search%3D1%22%5D" }} };

【讨论】：

抱歉回复晚了，这对您有帮助！

【解决方案2】：

在您的邮递员请求中，您的 post-body 的 requests 属性是一个数组

{
  "requests": [{...}]
}

而在您的 C# 代码中，它是一个对象

var load = new { 
  Requests = new { ... } 
}

因此服务器可能无法从您的请求中获取所需的数据。将requests 属性创建为List<object> 或object[]，以便将其序列化为数组

var load = new {
  Requests = new List<object>{new {...}}
}

【讨论】：

感谢您的解释，这很有帮助！

【解决方案3】：

请参阅下面代码中的注释也包括错误..

internal async Task<(string, int)> GetJsonFileFromApiCall(string query)
{
    var _client = new HttpClient();
    var apiUrl = "https://wf19vv0nsf-dsn.algolia.net/1/indexes/*/queries?x-algolia-agent=Algolia%20for%20vanilla%20JavaScript%20(lite)%203.27.0%3Binstantsearch.js%202.10.2%3BMagento2%20integration%20(1.12.1)%3BJS%20Helper%202.26.0&x-algolia-application-id=WF19VV0NSF&x-algolia-api-key=MDdmNjA0Mjc1YzRkZjI4MWMwZmQyMDI4MDc5NDY4ZjlkYzJmOTVmMWY5Yjc3MGFkNDRiODA4YjU0MDVlM2Q1YnRhZ0ZpbHRlcnM9";
    
    var load = new 
    { 
        Requests = new 
        { 
            IndexName = "magento2_tcg_productiondefault_products", 
            
            Params = $"query={query}&hitsPerPage=12&maxValuesPerFacet=8&page=0&highlightPreTag=__ais-highlight__&highlightPostTag=__
                        %2Fais-highlight__&ruleContexts=%5B%22magento_filters%22%2C%22%22%5D&facets=%5B%22mtg_setcode%22%2C%22is_foil%22%2C%22mtg_
                        rarity%22%2C%22sf_colours%22%2C%22sf_types%22%2C%22sf_legalities%22%2C%22price.AUD
                        .default%22%2C%22stock_qty%22%2C%22mtg_cmc%22%5D&numericFilters=%5B%22visibility_search%3D1%22%5D" 
        } 
    };

    //insepct this..... im sure this is probably not what you think it is.
    //worth double checking
    var resultS = GetStringContent(load); //inspect the result value.

    var message = await _client.PostAsync(apiUrl, resultS);
    message.EnsureSuccessStatusCode();
    
    var jToken = JObject.Parse(await message.Content.ReadAsStringAsync());
    
    //temp return
    return ("", 1);
} 

private static StringContent GetStringContent<T>(T load)
{
    var serializeObject = JsonConvert.SerializeObject(load, new JsonSerializerSettings { ContractResolver = new CamelCasePropertyNamesContractResolver() });
    return new StringContent(serializeObject, Encoding.UTF8, "application/json");
}

【讨论】：