<edmx:Edmx xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx" Version="4.0">
<edmx:DataServices>
<Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="OwinAspNetCore.Models">
<EntityType Name="Product">
<Key>
<PropertyRef Name="Id"/>
</Key>
<Property Name="Id" Type="Edm.Int32" Nullable="false"/>
<Property Name="Name" Type="Edm.String"/>
<Property Name="Price" Type="Edm.Decimal" Nullable="false"/>
</EntityType>
</Schema>
<Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="Default">
<Function Name="TestFunction" IsBound="true">
<Parameter Name="bindingParameter" Type="Collection(OwinAspNetCore.Models.Product)"/>
<Parameter Name="Val" Type="Edm.Int32" Nullable="false"/>
<Parameter Name="Name" Type="Edm.String"/>
<ReturnType Type="Edm.Int32" Nullable="false"/>
</Function>
<EntityContainer Name="Container">
<EntitySet Name="Products" EntityType="OwinAspNetCore.Models.Product"/>
</EntityContainer>
</Schema>
</edmx:DataServices>
</edmx:Edmx>

string postUrl = "http://localhost:port/....";
HttpClient client = new HttpClient();
var response = client.PostAsync(postUrl, new StringContent(JsonConvert.SerializeObject(new { Rating = 5 }), Encoding.UTF8, "application/json")).Result;

public const string MetadataDocumentUri = "http://localhost:port/odata/";

using ConsoleApplication1.OwinAspNetCore.Models;
using System;
using System.Linq;
namespace ConsoleApplication1
{
    public class Program
    {
        static void Main(string[] args)
        {
            Uri uri = new Uri("http://localhost:24977/odata");

            //var context = new Default.Container(uri);
            var context = new TestNameSpace.TestNameSpace(uri);

            //get
            var products = context.Products.Where(pr => pr.Name.Contains("a"))
                .Take(1).Select(pr => new { Firstname = pr.Name, PriceValue = pr.Price }).ToList();

            //add
            context.AddToProducts(new Product() { Name = "Name1", Price = 123 });

            //update
            Product p = context.Products.First();
            p.Name = "changed";
            context.UpdateObject(p);

            //delete
            context.DeleteObject(context.Products.Last());

            //commit
            context.SaveChanges();
        }
    }
}

//angularjs
$http.get("/products/get", {Name: "Test", Company: "Test"})
    .then(function(response) {
        console.log(response.data);
    });

//jquery
$.get("/products/get", {Name: "Test", Company: "Test"}, function(data, status){
        console.log("Data: " + data);
    });

let product1 = await context.products.filter(c => c.Name.contains("Ali")).toArray();
let product2 = await context.products.getSomeFunction(1, 'Test');
context.product.add({Name: 'Test'} as Product);
await context.saveChanges()