如何在C#中使用GraphQL查询多个API端点

public class MultiApiQuery
{
    public string Endpoint1Field { get; set; }
    public string Endpoint2Field { get; set; }
    // 添加更多的字段...
}

public class MultiApiResolver
{
    public string Resolve(MultiApiQuery query)
    {
        // 调用第一个API端点并获取结果
        var endpoint1Result = CallApiEndpoint1(query.Endpoint1Field);

        // 调用第二个API端点并获取结果
        var endpoint2Result = CallApiEndpoint2(query.Endpoint2Field);

        // 返回查询结果
        return $"{endpoint1Result}, {endpoint2Result}";
    }

    private string CallApiEndpoint1(string field)
    {
        // 调用第一个API端点并返回结果
        // 在这里你可以使用C#的HTTP请求库，如HttpClient，来发送请求
    }

    private string CallApiEndpoint2(string field)
    {
        // 调用第二个API端点并返回结果
        // 在这里你可以使用C#的HTTP请求库，如HttpClient，来发送请求
    }
}

var schema = Schema.For(@"
    type Query {
        multiApiQuery: String
    }
");

schema.Query.AddField(
    new FieldType
    {
        Name = "multiApiQuery",
        ResolvedType = new StringGraphType(),
        Resolver = new MultiApiResolver()
    }
);

var server = new GraphQL.Server.Ui.Playground.GraphQLPlaygroundOptions { Path = "/playground" };

app.UseGraphQL<ISchema>(new GraphQL.Server.Ui.Playground.GraphQLPlaygroundOptions { Path = "/playground" });

using (var client = new HttpClient())
{
    var query = @"
        query {
            multiApiQuery {
                endpoint1Field
                endpoint2Field
            }
        }
    ";

    var request = new HttpRequestMessage
    {
        Method = HttpMethod.Post,
        RequestUri = new Uri("http://your-graphql-server-endpoint"),
        Content = new StringContent(query, Encoding.UTF8, "application/json")
    };

    var response = await client.SendAsync(request);
    var result = await response.Content.ReadAsStringAsync();

    // 解析和处理查询结果
}