Microsoft.AspNetCore.OData<\/code> package(currently at version 8.0.11).<\/p>\nFor this article, we will implement the above-mentioned scenario and create a web service that uses OData with ASP.NET Core Web API to create an endpoint for data on companies and products.<\/p>\n
The Model<\/h3>\n
First, we define our model:<\/p>\n
public class Company\r\n{\r\n public int ID { get; set; }\r\n public string? Name { get; set; }\r\n public int Size { get; set; }\r\n public List<Product>? Products { get; set; }\r\n}\r\n<\/pre>\nEach company provides a range of products:<\/p>\n
public class Product\r\n{\r\n public int ID { get; set; }\r\n public int CompanyID { get; set; }\r\n public string? Name { get; set; }\r\n public decimal Price { get; set; }\r\n}<\/pre>\nWe will use the in-memory database for this article. For that, we are going to implement the Context class:<\/p>\n
public class ApiContext: DbContext\r\n{\r\n public ApiContext(DbContextOptions<ApiContext> options)\r\n : base(options)\r\n {\r\n }\r\n\r\n public DbSet<Company> Companies { get; set; }\r\n public DbSet<Product> Products { get; set; }\r\n}<\/pre>\nWe also create a simplified repository class that will handle the interactions with the database:<\/p>\n
public class CompanyRepo : ICompanyRepo\r\n{\r\n private readonly ApiContext _context;\r\n public CompanyRepo(ApiContext context)\r\n {\r\n _context = context;\r\n }\r\n\r\n public IQueryable<Company> GetAll()\r\n {\r\n return _context.Companies\r\n .Include(a => a.Products)\r\n .AsQueryable();\r\n }\r\n\r\n public IQueryable<Company> GetById(int id)\r\n {\r\n return _context.Companies\r\n .Include(a => a.Products)\r\n .AsQueryable()\r\n .Where(c => c.ID == id);\r\n }\r\n\r\n public void Create(Company company)\r\n {\r\n _context.Companies\r\n .Add(company);\r\n _context.SaveChanges();\r\n }\r\n\r\n public void Update(Company company)\r\n {\r\n _context.Companies\r\n .Update(company);\r\n _context.SaveChanges();\r\n }\r\n\r\n public void Delete(Company company)\r\n {\r\n _context.Companies\r\n .Remove(company);\r\n _context.SaveChanges();\r\n }\r\n}\r\n<\/pre>\nThe CompanyRepo<\/code> class implements the ICompanyRepo<\/code> interface:<\/p>\npublic interface ICompanyRepo\r\n{\r\n public IQueryable<Company> GetAll();\r\n public IQueryable<Company> GetById(int id);\r\n public void Create(Company company);\r\n public void Update(Company company);\r\n public void Delete(Company company);\r\n}<\/pre>\nNote that both our GetXXX()<\/code> methods return a reference to IQueryable<Company><\/code>. OData will use this interface to perform queries on company data.<\/p>\nUsing OData With ASP.NET Core Web API<\/h2>\n
Now, we proceed with creating our controller. The controller seems like a usual RESTful controller and actually, it can work like one. This means that we can send a GET request to \/api\/companies<\/code> and receive a list of all companies in the repository.<\/p>\n[Route(\"api\/[controller]\")]\r\n[ApiController]\r\npublic class CompaniesController : ControllerBase\r\n{\r\n private readonly ICompanyRepo _repo;\r\n public CompaniesController(ICompanyRepo repo)\r\n {\r\n _repo = repo;\r\n }\r\n\r\n ...\r\n}\r\n<\/pre>\nGET requests<\/h3>\n
The power of OData lies mainly in the functionality that it offers for performing queries. Therefore, the GET requests are the most interesting part of OData. In the controller, we implement two types of GET requests:<\/p>\n
[EnableQuery(PageSize = 3)]\r\n[HttpGet]\r\npublic IQueryable<Company> Get()\r\n{\r\n return _repo.GetAll();\r\n}\r\n\r\n[EnableQuery]\r\n[HttpGet(\"{id}\")]\r\npublic SingleResult<Company> Get([FromODataUri] int key)\r\n{\r\n return SingleResult.Create(_repo.GetById(key));\r\n}<\/pre>\nIn order to enable OData, we do three things:<\/p>\n
\n- Annotate the respective methods with the
[EnableQuery]<\/code> attribute<\/li>\n- Made the first method return an
IQueryable<\/code> reference to the company list<\/li>\n- Made the second method return a
SingleResult<\/code> reference to the selected item in the company list<\/li>\n<\/ul>\nThe [EnableQuery]<\/code> attribute enables clients to send queries, by using query options such as $filter, $sort, and $page. By using IQueryable<\/code>, OData will be able to query the list in various ways. Note that we can also define a default page size (3) for each request.<\/p>\nYou should pay special care to the second method: if you define the method input parameter with a name other than key<\/code> then this method will not work!<\/p>\nPOST\/PUT\/DELETE Requests With OData and ASP.NET Core Web API<\/h3>\n
We can support all CRUD requests with OData, by adding the respective methods in the companies controller. The POST request inserts a new company into the database:<\/p>\n
[HttpPost]\r\npublic IActionResult Post([FromBody] Company company)\r\n{\r\n if (!ModelState.IsValid)\r\n {\r\n return BadRequest(ModelState);\r\n }\r\n _repo.Create(company);\r\n\r\n return Created(\"companies\", company);\r\n}\r\n<\/pre>\nWith the PUT request, we can update an entry:<\/p>\n
[HttpPut]\r\npublic IActionResult Put([FromODataUri] int key, [FromBody] Company company)\r\n{\r\n if (!ModelState.IsValid)\r\n {\r\n return BadRequest(ModelState);\r\n }\r\n\r\n if (key != company.ID)\r\n {\r\n return BadRequest();\r\n }\r\n\r\n _repo.Update(company);\r\n\r\n return NoContent();\r\n}<\/pre>\nFinally, we can delete a company from the database, by using the DELETE method:<\/p>\n
[HttpDelete]\r\npublic IActionResult Delete([FromODataUri] int key)\r\n{\r\n var company = _repo.GetById(key);\r\n if (company is null)\r\n {\r\n return BadRequest();\r\n }\r\n\r\n _repo.Delete(company.First());\r\n\r\n return NoContent();\r\n}<\/pre>\nOData Setup<\/h3>\n
Finally, we have to register OData in Program.cs<\/code>:<\/p>\nstatic IEdmModel GetEdmModel()\r\n{\r\n ODataConventionModelBuilder builder = new();\r\n builder.EntitySet<Company>(\"Companies\");\r\n return builder.GetEdmModel();\r\n}\r\n\r\nvar builder = WebApplication.CreateBuilder(args);\r\n\r\nbuilder.Services.AddControllers()\r\n .AddOData(options => options\r\n .AddRouteComponents(\"odata\", GetEdmModel())\r\n .Select()\r\n .Filter()\r\n .OrderBy()\r\n .SetMaxTop(20)\r\n .Count()\r\n .Expand()\r\n );\r\n\r\nbuilder.Services.AddDbContext<ApiContext>(opt => opt.UseInMemoryDatabase(databaseName: \"CompaniesDB\"));\r\nbuilder.Services.AddScoped<ICompanyRepo, CompanyRepo>();\r\nvar app = builder.Build();\r\nDBSeeder.AddCompaniesData(app);\r\n\r\n...<\/pre>\nWe register Oda with the AddOData()<\/code> method, where we also define a number of options regarding the capabilities of our web service. Here, we create an OData endpoint that will:<\/p>\n\n- contain \u201c
odata<\/code>\u201d in the URL (instead of\u00a0 the usual \u201capi<\/code>\u201d)<\/li>\n- enable selection, filtering, ordering, counting, and expansion functionality<\/li>\n
- return up to 20 entries at each request<\/li>\n<\/ul>\n
The AddOData()<\/code> method uses the GetEdmModel()<\/code>method that returns the data model, which is the basis of an OData service. The OData service uses an abstract data model called Entity Data Model (EDM) to describe the exposed data in the service. The ODataConventionModelBuilder<\/code> class creates an EDM by using a set of default naming conventions EDM, an approach that requires the least code. We can use the ODataModelBuilder<\/code> class to create the EDM if we want more control over the EDM.<\/p>\nWe should pay attention to the EntitySet<\/code> method: we should provide the exact name of the controller (Companies<\/code>) as its parameter. If we use a different name for the entity set (e.g. Company<\/code> instead of Companies<\/code>), then OData will not work.<\/p>\nFinally, in order to seed the in-memory database, we run the AddCompaniesData()<\/code> static method, which we define in a separate class (DBSeeder.cs<\/code>):<\/p>\npublic class DBSeeder\r\n{\r\n public static void AddCompaniesData(WebApplication app)\r\n {\r\n var scope = app.Services.CreateScope();\r\n var db = scope.ServiceProvider.GetService<ApiContext>();\r\n\r\n db.Companies.Add(\r\n new Company()\r\n {\r\n ID = 1,\r\n Name = \"Company A\",\r\n Size = 25\r\n });\r\n\r\n \/\/more companies here...\r\n \r\n db.Products.Add(\r\n new Product()\r\n {\r\n ID = 1,\r\n CompanyID = 1,\r\n Name = \"Product A\",\r\n Price = 10\r\n });\r\n\r\n \/\/more products here..\r\n\r\n db.SaveChanges();\r\n }\r\n}<\/pre>\nNow, we are ready to run our OData service and test the API!<\/p>\n
Testing the API<\/h2>\n
Using Postman, or a web browser, we can send a GET request to our web service: \/odata\/companies?$filter=Size gt 20&$count=true<\/code>.<\/p>\nAfter we do that, we can inspect the returned JSON payload as a result:<\/p>\n
{\r\n \"@odata.context\": \"https:\/\/localhost:7004\/odata\/$metadata#Companies\",\r\n \"@odata.count\": 3,\r\n \"value\": [\r\n {\r\n \"ID\": 1,\r\n \"Name\": \"Company A\",\r\n \"Size\": 25\r\n },\r\n {\r\n \"ID\": 2,\r\n \"Name\": \"Company B\",\r\n \"Size\": 56\r\n },\r\n {\r\n \"ID\": 4,\r\n \"Name\": \"Company D\",\r\n \"Size\": 205\r\n }\r\n ]\r\n}<\/pre>\nWe see that the companies’ data returned by OData do not contain any information about their respective products. In order to get the products too, we additionally need to send the $expand option: \/odata\/companies?$filter=Size gt 20&$count=true&$expand=Products<\/code>.<\/p>\nThe results now contain also information about products:<\/p>\n
{\r\n \"@odata.context\": \"https:\/\/localhost:7004\/odata\/$metadata#Companies(Products())\",\r\n \"@odata.count\": 3,\r\n \"value\": [\r\n {\r\n \"ID\": 1,\r\n \"Name\": \"Company A\",\r\n \"Size\": 25,\r\n \"Products\": [\r\n {\r\n \"ID\": 1,\r\n \"Name\": \"Product A\",\r\n \"Price\": 10\r\n },\r\n {\r\n \"ID\": 2,\r\n \"Name\": \"Product B\",\r\n \"Price\": 35\r\n }\r\n ]\r\n },\r\n \r\n \/\/ --> more companies and products here\r\n ]\r\n}<\/pre>\nNext, we create a new company by sending a POST request to URL \/odata\/companies<\/code> with the body:<\/p>\n{\r\n \"ID\": 10,\r\n \"Name\": \"Company Z\",\r\n \"Size\": 100\r\n}<\/pre>\nThe returned response contains the newly created object:<\/p>\n
{\r\n \"@odata.context\": \"https:\/\/localhost:7004\/odata\/$metadata#Companies\/$entity\",\r\n \"ID\": 10,\r\n \"Name\": \"Company Z\",\r\n \"Size\": 100\r\n}<\/pre>\nWe can also modify an existing entry (the one with ID=1) by sending a PUT request to the URL \/odata\/companies(1)<\/code> with the body:<\/p>\n{\r\n \"ID\": 1,\r\n \"Name\": \"Company A\",\r\n \"Size\": 350\r\n}<\/pre>\nFinally, we may delete an entry (again with ID=1) by sending a DELETE request to the URL \/odata\/companies(1)<\/code>. Both PUT and DELETE methods return a 204 No Content<\/code> response.<\/p>\nConclusion<\/h2>\n
In this article, we have learned how to incorporate the OData standard in our ASP.NET Core projects, in order to create web APIs with extensive querying capabilities.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this article, we will learn how to use OData with ASP.NET Core Web API services. OData (Open Data Protocol) is an open protocol that defines a set of best practices for building and consuming RESTful APIs. Initiated by Microsoft in 2007, it has become an OASIS standard and has been approved by ISO\/IEC. Currently, […]<\/p>\n","protected":false},"author":6,"featured_media":62187,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2079],"tags":[79,122,121,1465,57,58,130],"class_list":["post-75928","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-web-api","tag-asp-net-core","tag-delete","tag-get","tag-odata","tag-post","tag-put","tag-web-api","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"\n
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