How to pass Array to OData function in ASP.NET Web API implementation?(如何在ASP.NET Web API实现中将Array传递给OData函数？)

本文介绍了如何在ASP.NET Web API实现中将Array传递给OData函数？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

OData V4规范规定必须能够： https://issues.oasis-open.org/browse/ODATA-636。
"复杂类型和数组只能通过 参数别名"

当我尝试传递具有OData参数别名的数组时，发生异常。

/TestEntities/NS.TestFunction(ArrayHere=@p)？@p=[1，2，3]

结果为：

无法将类型为"EdmValidCoreModelPrimitiveType"的对象强制转换为类型 ‘Microsoft.OData.Edm.IEdm结构类型

有趣的是，元数据文档针对这样的情况进行了正确的组合：

<Function Name="TestFunction" IsBound="true">
  <Parameter Name="bindingParameter" Type="Collection(NS.TestEntity)"/>
  <Parameter Name="ArrayHere" Type="System.Int32[]"/>
  <ReturnType Type="Collection(NS.TestEntity)"/>
</Function>

是否可以使用ASP.NET MVC Web API%2 OData将数组传递给查询字符串中的OData函数？

更新：

以下是构建EDM模型和控制器的代码。

 var builder = new ODataConventionModelBuilder();

 builder.Namespace = "NS";

 builder.EntitySet<TestEntity>("TestEntities");

 builder.EntityType<TestEntity>().Collection
    .Function("TestFunction")
    .ReturnsCollectionFromEntitySet<TestEntity>("TestEntities")
    .Parameter<int[]>("ArrayHere");

控制器：

public class TestEntitiesController : ODataController
{
    public IEnumerable<TestEntity> TestFunction(int[] arrayHere)
    {
        throw new NotImplementedException();
    }
}

用[FromODataUri]标记参数不能解决问题。

更新2：

以下是堆栈跟踪：

at Microsoft.OData.Core.UriParser.TypePromotionUtils.CanConvertTo(SingleValueNode sourceNodeOrNull, IEdmTypeReference sourceReference, IEdmTypeReference targetReference)
at Microsoft.OData.Core.UriParser.Parsers.MetadataBindingUtils.ConvertToTypeIfNeeded(SingleValueNode source, IEdmTypeReference targetTypeReference)
at Microsoft.OData.Core.UriParser.Parsers.FunctionCallBinder.BindSegmentParameters(ODataUriParserConfiguration configuration, IEdmOperation functionOrOpertion, ICollection`1 segmentParameterTokens)
at Microsoft.OData.Core.UriParser.Parsers.ODataPathParser.TryBindingParametersAndMatchingOperation(String identifier, String parenthesisExpression, IEdmType bindingType, ODataUriParserConfiguration configuration, ICollection`1& boundParameters, IEdmOperation& matchingOperation)
at Microsoft.OData.Core.UriParser.Parsers.ODataPathParser.TryCreateSegmentForOperation(ODataPathSegment previousSegment, String identifier, String parenthesisExpression)
at Microsoft.OData.Core.UriParser.Parsers.ODataPathParser.CreateNextSegment(String text)
at Microsoft.OData.Core.UriParser.Parsers.ODataPathParser.ParsePath(ICollection`1 segments)
at Microsoft.OData.Core.UriParser.Parsers.ODataPathFactory.BindPath(ICollection`1 segments, ODataUriParserConfiguration configuration)
at Microsoft.OData.Core.UriParser.ODataUriParser.ParsePathImplementation()
at Microsoft.OData.Core.UriParser.ODataUriParser.Initialize()
at System.Web.OData.Routing.DefaultODataPathHandler.Parse(IEdmModel model, String serviceRoot, String odataPath, Boolean enableUriTemplateParsing)
at System.Web.OData.Routing.DefaultODataPathHandler.Parse(IEdmModel model, String serviceRoot, String odataPath)
at System.Web.OData.Routing.ODataPathRouteConstraint.Match(HttpRequestMessage request, IHttpRoute route, String parameterName, IDictionary`2 values, HttpRouteDirection routeDirection)
at System.Web.Http.Routing.HttpRoute.ProcessConstraint(HttpRequestMessage request, Object constraint, String parameterName, HttpRouteValueDictionary values, HttpRouteDirection routeDirection)
at System.Web.Http.Routing.HttpRoute.ProcessConstraints(HttpRequestMessage request, HttpRouteValueDictionary values, HttpRouteDirection routeDirection)
at System.Web.Http.Routing.HttpRoute.GetRouteData(String virtualPathRoot, HttpRequestMessage request)
at System.Web.Http.WebHost.Routing.HttpWebRoute.GetRouteData(HttpContextBase httpContext)

推荐答案

假设您使用的是OData V4，则在注册函数时需要使用CollectionParameter，并且在arrayHere参数上缺少[FromODataUri]。此外，请尝试使用IEnumerable<int>而不是数组。

var builder = new ODataConventionModelBuilder();

 builder.Namespace = "NS";

 builder.EntitySet<TestEntity>("TestEntities");

 builder.EntityType<TestEntity>().Collection
    .Function("TestFunction")
    .ReturnsCollectionFromEntitySet<TestEntity>("TestEntities")
    .CollectionParameter<int>("ArrayHere");

使用控制器中的函数如下.

[HttpGet]
public async Task<IHttpActionResult> TestFunction([FromODataUri] IEnumerable<int> ArrayHere)
{
    // Do stuff
}

现在您可以提出如下请求.

http://yourRestService/API/TestEntities/NS.TestFunction(ArrayHere=[1,2,3])

注意，您还可以接受复杂类型的数组。您必须对数组的json进行url编码，并使用参数别名，因此最终结果如下所示.

 builder.EntityType<TestEntity>().Collection
    .Function("TestFunction2")
    .ReturnsCollectionFromEntitySet<TestEntity>("TestEntities")
    .CollectionParameter<person>("ArrayHere");

和

[HttpGet]
public async Task<IHttpActionResult> TestFunction2([FromODataUri] IEnumerable<person> ArrayHere)
{
    // Do stuff
}

http://yourRestService/API/TestEntities/NS.TestFunction2(ArrayHere=@ArrayData)?@ArrayData=%5B%7B%22FirstName%22%3A%22Bob%22%2C+%22LastName%22%3A%22Dole%22%7D%2C%7B%22FirstName%22%3A%22Bill%22%2C+%22LastName%22%3A%22Clinton%22%7D%5D

这篇关于如何在ASP.NET Web API实现中将Array传递给OData函数？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！