NuGet 搜索 GraphQL

public class User
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public int Age { get; set; }

        public string Gender { get; set; }
    }

public class UserType:ObjectGraphType<User>// 继承自ObjectGraphType，并传递范型User
    {
        public UserType()// 在构造函数中，对属性作影射
        {
            Name = "User";

            Field(x => x.Id);
            Field(x => x.Name);
            Field(x => x.Age);
            Field(x => x.Gender);
        }
    }

public class Query : ObjectGraphType// 定义Query
    {
        private IWrapper wrapper = new Wrapper();
        IEnumerable<User> users = null;
        public Query()
        {
            Field<ListGraphType<UserType>>(//在构造函数中定义查询操作
                name: "users", //注意这个名字，后边查询的时候需要对应
                arguments: new QueryArguments //定义查询参数
                {
                    new QueryArgument<StringGraphType>
                    {
                        Name = "name",
                        Description = "The name for the user"
                    },
                    new QueryArgument<IntGraphType>
                    {
                        Name = "age",
                        Description = "The age for the user"
                    },
                    new QueryArgument<StringGraphType>
                    {
                        Name = "gender",
                        Description = "The gender for user"
                    }
                },
                resolve: context =>// 定义查询操作的执行
                {
                    var usercontext = context.UserContext;// 获取上下文，可在此作用户验证操作
                    users = wrapper.User.Find(u => true);
                    var name = context.GetArgument<string>("name");
                    users = users.Where(u => name == null || u.Name == name);
                    var age = context.GetArgument<int?>("age");
                    users = users.Where(u => age == null || u.Age == age);
                    var gender = context.GetArgument<string>("gender");
                    users = users.Where(u => gender == null || u.Gender == gender);
                    return users;
                });
　　　　}
}

public class Mutation:ObjectGraphType
    {
        private IWrapper wrapper = new Wrapper();
        IEnumerable<User> users = null;
        public Mutation()
        {
            Field<UserType>(
                name: "createUser",
                arguments: new QueryArguments(
                    new QueryArgument<NonNullGraphType<UserInputType>>
                    {
                        Name = "user"
                    }
                ),
                resolve: context =>
                {
                    var user = context.GetArgument<User>("user");
                    return wrapper.User.Add(user);
                }
            );
        }
    }

public class GraphSchema:Schema
    {
        public GraphSchema()
        {
            Query = new Query();
            Mutation = new Mutation();
        }
    }

public class GraphQLQuery
    {
        public string OperationName { get; set; }
        public string NamedQuery { get; set; }
        public string Query { get; set; }

        public object UserContext { get; set; }
        public JObject Variables { get; set; }
    }

public class ActionExecute
    {
        private IDocumentExecuter executer;
        private IDocumentWriter writer;
        private ISchema schema;

        public ActionExecute()
        {
            executer = new DocumentExecuter();
            writer = new DocumentWriter();
            schema = new GraphSchema();
        }

        public async Task<ExecutionResult> ExecuteAction(GraphQLQuery query)
        {
            var result = await executer.ExecuteAsync(_ =>
            {
                _.Schema = schema;
                _.Query = query.Query;
                _.Inputs = query.Variables.ToInputs();// 查询变量的输入
                _.OperationName = query.OperationName;// 操作名称
                _.UserContext = query.UserContext;// 添加用户上下文对象
                _.ValidationRules = DocumentValidator.CoreRules(); // 添加自定义查询验证 逻辑 
                _.ExposeExceptions = true;// 是否追踪错误
                _.FieldMiddleware.Use<ErrorHandlerMiddleware>(); // 使用中间件
                _.EnableMetrics = true;// 是否使用查询度量

                _.ComplexityConfiguration = new ComplexityConfiguration // 防止恶意查询
                {
                    MaxComplexity = 12,
                    MaxDepth = 15 // 允许查询总最大嵌套数
                };
            });
            return result;
        }

        public async Task<string> Execute(GraphQLQuery query)
        {
            var result = await ExecuteAction(query).ConfigureAwait(false);

            var json = await writer.WriteToStringAsync(result);

            return json;
        }
    }

public class QueryTest
    {
        private ActionExecute execute = new ActionExecute();
        [Fact]
        public void TestMethod1()
        {
            Assert.True(1 == 1);
        }
        [Theory]
        [InlineData(16, "Male")]
        [InlineData(18, "FeMale")]
        public async void QueryUsers(int age, string gender)
        {
            var queryStr = @"{users(age:" + age + ",gender:" + "\"" + gender + "\"" + "){id name gender age}}";
            var result = await execute.ExecuteAction(new GraphQLQuery { Query = queryStr,UserContext= "Add Role" });
            var data = result.Data;
            Assert.Null(result.Errors?.Count);
        }
    }

public class MutationTest
    {
        private ActionExecute execute = new ActionExecute();

        [Theory]
        [InlineData(16, "Test1")]
        [InlineData(18, "Test2")]
        public async void CreateUser(int age, string name)
        {
            var queryStr = @"{query: mutation ($user: UserInput!){createUser(user:$user){id name age}},variables:{user:{name: " + name + @",age:" + age + @"}}}";

            var query = new GraphQLQuery
            {
                Query = "mutation ($user: UserInput!){createUser(user:$user){id name age}}",
                Variables = JObject.Parse("{user:{\"name\": \"" + name + "\",\"age\":" + age + "}}")
            };
            var result = await execute.ExecuteAction(query);
            Assert.Null(result.Errors.Count);
        }
    }