Fetch() 在 C# 中等效于 Hasura 上的 GraphQL

Question

我正在尝试了解应用于 .net (C#) 的 GraphQL。

我的目标是转换此 javascript 代码：

fetch('https://____.herokuapp.com/v1/graphql', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Accept': 'application/json',
  },
  body: JSON.stringify({query: " {test {qqch date}}"})
})
  .then(r => r.json())
  .then(data => console.log('data returned:', data));

，进入 C#。这是我所在的位置，但无法继续前进：

    //Define your baseUrl
    string baseUrl = "https://_____.herokuapp.com/v1/graphql";
    var json = JsonConvert.SerializeObject("{test {qqch date}}"); 

    StringContent httpContent = new StringContent(json, Encoding.UTF8, "application/json");


    //Have your using statements within a try/catch block
    try
    {
        //We will now define your HttpClient with your first using statement which will use a IDisposable.
        using (HttpClient client = new HttpClient())
        {
            //In the next using statement you will initiate the Get Request, use the await keyword so it will execute the using statement in order.
            using (HttpResponseMessage res = await client.PostAsync(baseUrl, httpContent))
            {
                //Then get the content from the response in the next using statement, then within it you will get the data, and convert it to a c# object.
                using (HttpContent content = res.Content)
                {
                    //Now assign your content to your data variable, by converting into a string using the await keyword.
                    var data = await content.ReadAsStringAsync();

                    //If the data isn't null return log convert the data using newtonsoft JObject Parse class method on the data.
                    if (data != null)
                    {
                        //Now log your data in the console
                        Console.WriteLine("data------------{0}", data);
                        Console.ReadKey();

                    }
                    else
                    {
                        Console.WriteLine("NO Data----------");
                        Console.ReadKey();

                    }
                }
            }
        }
    }
    catch (Exception exception)
    {
        Console.WriteLine("Exception Hit------------");
        Console.WriteLine(exception);
        Console.ReadKey();
    }

有人可以告诉我我做错了什么吗？

当我运行 javascript 代码时，当我运行 C# 代码时，我没有问题，我从 Hasura 收到以下消息： {"errors":[{"extensions":{"path":"$","code":"parse-failed"},"message":"When parsing the constructor GQLReq of type Hasura.GraphQL.Transport.HTTP.Protocol.GQLReq expected Object but got String." }]}

Answer 1

body: JSON.stringify({query: " {test {qqch date}}"})

所以 body = "{\"query\": \" {test {qqch date}}\"}"?

var json = JsonConvert.SerializeObject("{query: {test {qqch date}}}");

但是在你的 C# 代码中，json = "\"{query: {test {qqch date}}}\""?

您可以对 json 字符串进行硬编码。或者研究其他方法来使用 JsonConvert.SerializeObject 将 c# 类型转换为 json 字符串。

Fetch() 在 C# 中等效于 Hasura 上的 GraphQL

Fetch() equivalent in C# for GraphQL on Hasura

c#

graphql

hasura