获取相关实体ASP.NET WebApi OData v4导致"找不到与请求URI匹配的HTTP资源"

正如我在问题中提到的那样,我尝试了许多解决方案来实现这一点,但实际上解决问题并没有一致,我一直在避免在这个问题/答案中提出的解决方案,因为该教程专门针对v4而且我认为答案必须是旧版本(多么不明智).

所以答案确实解决了问题,但需要一些工作才能直接适应OData v4和ODataConventionModelBuilder; 这就是我发布这个问题和答案的原因; 提供解决方案,特别是对OData v4和ODataConventionModelBuilder,希望其他人不会失去我调查的时间.

首先,设置您的EdmModel:

private static IEdmModel GetEdmModel()
{
    var builder = new ODataConventionModelBuilder();
    builder.EnableLowerCamelCase();
    builder.EntitySet<Menu>("Menus");
    builder.EntitySet<MenuPermission>("MenuPermissions");
    var edmModel = builder.GetEdmModel();
    AddNavigations(edmModel); //see below for this method
    return edmModel;
}

第二个AddNavigations:

private static void AddNavigations(IEdmModel edmModel)
{
    AddMenuPermissionsNavigation(edmModel);
}

private static void AddMenuPermissionsNavigation(IEdmModel edmModel)
{
    var menus = (EdmEntitySet) edmModel.EntityContainer.FindEntitySet("Menus");
    var menuPermissions = (EdmEntitySet)edmModel.EntityContainer.FindEntitySet("MenuPermissions");
    var menuType = (EdmEntityType) edmModel.FindDeclaredType("iiid8.cms.data.models.Menu"); //"iiid8.cms.data.models" is the C# namespace
    var menuPermissionType = (EdmEntityType)edmModel.FindDeclaredType("iiid8.cms.data.models.MenuPermission"); //as above, "iiid8.cms.data.models" is the C# namespace
    AddOneToManyNavigation("MenuPermissions", menus, menuPermissions, menuType, menuPermissionType);
    AddManyToOneNavigation("Menu", menus, menuPermissions, menuType, menuPermissionType);
}

private static void AddOneToManyNavigation(string navTargetName, EdmEntitySet oneEntitySet, EdmEntitySet manyEntitySet,
    EdmEntityType oneEntityType, EdmEntityType manyEntityType)
{
    var navPropertyInfo = new EdmNavigationPropertyInfo
    {
        TargetMultiplicity = EdmMultiplicity.Many,
        Target = manyEntityType,
        ContainsTarget = false,
        OnDelete = EdmOnDeleteAction.None,
        Name = navTargetName
    };
    oneEntitySet.AddNavigationTarget(oneEntityType.AddUnidirectionalNavigation(navPropertyInfo), manyEntitySet);
}

private static void AddManyToOneNavigation(string navTargetName, EdmEntitySet oneEntitySet, EdmEntitySet manyEntitySet,
    EdmEntityType oneEntityType, EdmEntityType manyEntityType) {
    var navPropertyInfo = new EdmNavigationPropertyInfo {
        TargetMultiplicity = EdmMultiplicity.One,
        Target = oneEntityType,
        ContainsTarget = false,
        OnDelete = EdmOnDeleteAction.None,
        Name = navTargetName
    };
    manyEntitySet.AddNavigationTarget(manyEntityType.AddUnidirectionalNavigation(navPropertyInfo), oneEntitySet);
}

最后,从WebApiConfig.Register调用GetEdmModel

config.MapODataServiceRoute("odata", null, GetEdmModel());

现在,从您的客户端调用您的OData服务的一对多和多对一导航,所有这些都应该适合您的世界.在我的情况下,调用看起来像这样:

一到多:

http://localhost:19215/Menus(c94f7f98-6987-e411-8119-984be10349a2)/MenuPermissions

多对一之一:

http://localhost:19215/MenuPermissions(ba0da52a-6c87-e411-8119-984be10349a2)/Menu

这个答案假设您设置了项目的其余部分,就像Mike Wasson在问题中链接的教程中所建议的那样(该链接指向第3部分 - 您需要首先遵循第1部分!).