OData 抛出 URI 中指定的查询无效

Question

客户是第三方，所以我无权访问该来源。不过，我有一份解释良好的 PDF，其中包含客户使用的一些请求示例。例如，

/Customers?$filter=ID+eq+guid'1D225D75-A587-4AE4-BA9A-2224B2484EA5' 

/Customers?$filter=Code+eq+12345 

这是我第一次使用 OData 和实体框架，目前遇到了过滤问题。

当我执行一个简单的 GET 请求而不进行过滤时，它会正确返回数据。但是，当我做类似的事情时

http://localhost:52973/odata/customers?$filter=Code+eq+12069

它返回错误：

{"error":{"code":"","message":"The query specified in the URI is not valid. A binary operator with incompatible types was detected. Found operand types 'Edm.String' and 'Edm.Int32' for operator kind 'Equal'.","details":[],"innererror":{"message":"A binary operator with incompatible types was detected. Found operand types 'Edm.String' and 'Edm.Int32' for operator kind 'Equal'.","type":"Microsoft.OData.ODataException","stacktrace":"   at Microsoft.OData.UriParser.BinaryOperatorBinder.PromoteOperandTypes(BinaryOperatorKind binaryOperatorKind, SingleValueNode& left, SingleValueNode& right, TypeFacetsPromotionRules facetsPromotionRules)\r\n   at Microsoft.OData.UriParser.BinaryOperatorBinder.BindBinaryOperator(BinaryOperatorToken binaryOperatorToken)\r\n   at Microsoft.OData.UriParser.MetadataBinder.Bind(QueryToken token)\r\n   at Microsoft.OData.UriParser.FilterBinder.BindFilter(QueryToken filter)\r\n   at Microsoft.OData.UriParser.ODataQueryOptionParser.ParseFilterImplementation(String filter, ODataUriParserConfiguration configuration, ODataPathInfo odataPathInfo)\r\n   at Microsoft.OData.UriParser.ODataQueryOptionParser.ParseFilter()\r\n   at Microsoft.AspNet.OData.Query.FilterQueryOption.get_FilterClause()\r\n   at Microsoft.AspNet.OData.Query.Validators.FilterQueryValidator.Validate(FilterQueryOption filterQueryOption, ODataValidationSettings settings)\r\n   at Microsoft.AspNet.OData.Query.Validators.ODataQueryValidator.Validate(ODataQueryOptions options, ODataValidationSettings validationSettings)\r\n   at Microsoft.AspNet.OData.EnableQueryAttribute.ValidateQuery(HttpRequest request, ODataQueryOptions queryOptions)\r\n   at Microsoft.AspNet.OData.EnableQueryAttribute.<>c__DisplayClass1_0.<OnActionExecuted>b__3(ODataQueryContext queryContext)\r\n   at Microsoft.AspNet.OData.EnableQueryAttribute.ExecuteQuery(Object responseValue, IQueryable singleResultCollection, IWebApiActionDescriptor actionDescriptor, Func`2 modelFunction, IWebApiRequestMessage request, Func`2 createQueryOptionFunction)\r\n   at Microsoft.AspNet.OData.EnableQueryAttribute.OnActionExecuted(Object responseValue, IQueryable singleResultCollection, IWebApiActionDescriptor actionDescriptor, IWebApiRequestMessage request, Func`2 modelFunction, Func`2 createQueryOptionFunction, Action`1 createResponseAction, Action`3 createErrorAction)"}}}

那么让我们开始吧。在我们的 Startup.cs 中：

   public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            ....
            app.UseMvc(b =>
            {
                b.Select().Expand().Filter().OrderBy().MaxTop(100).Count();
                b.MapODataServiceRoute("odata", "odata", GetEdmModel());
            });
        }

        private static IEdmModel GetEdmModel()
        {
            ODataConventionModelBuilder builder = new ODataConventionModelBuilder();
            builder.EntitySet<Customer>("Customers").EntityType
                .Filter(nameof(Customer.Id),nameof(Customer.Code));
            return builder.GetEdmModel();
        }

然后是我们的控制器：

public class CustomersController : ODataController
    {
        private readonly IsahContext db; //IsahContext is our DbContext class ;) 

        public CustomersController()
        {
            this.db = new IsahContext();
        }
   [HttpGet]
        [EnableQuery]
        public IActionResult Get()
        {
            var AllCusts = GetAllCustomers();
            return Ok(AllCusts);
        }

        [HttpGet]
        [EnableQuery]
        public IActionResult Get(Guid Id, string Code)
        {
            var AllCusts = GetAllCustomers();
            if (!string.IsNullOrEmpty(Code))
            {
                return Ok(AllCusts.FirstOrDefault(c => c.Code == Code));
            }
            return Ok(AllCusts.FirstOrDefault(c => c.Id == Id));
        }
        public IList<Customer> GetAllCustomers()
        {
            IList<Customer> customers = null;
            customers = db.Customers.FromSql("SomeProcName").ToList();
            return customers;
        }

Answer 1

删除加号 ( +) 并将值括在单引号中，因为它应该是字符串相等性检查。最后一个 uri 应该是：

http://localhost:52973/odata/customers?$filter=Code eq '12069'

如果您想要使用编码的 uri%20来表示空格和%27单引号：

http://localhost:52973/odata/customers?$filter=Code%20eq%20%2712069%27