The simplest implementation of OData client.

Install

$ dotnet add package ODataHttpClient
PS> Install-Package  ODataHttpClient

Restrictions

• Not support XML (JSON only)
• Not support Query Builder

Usage

Simple Request

var client = new HttpClient();
var odata = new ODataClient(client);
var request = Request.Get($"{endpoint}/Products?$count=true");
var response = await odata.SendAsync(request);

if (response.Success) 
{
    var total = response.ReadAs<int>("$['@odata.count']");
    var products = response.ReadAs<IEnumerable<Product>>("$.value");
}

Batch Request

var client = new HttpClient();
var odata = new ODataClient(client);
var batch = new BatchRequest($"{endpoint}/$batch")
{
    Requests = new []
    {
        Request.Post($"{endpoint}/Products", new 
        { 
            Name = "Sample"
        }),
        Request.Post($"{endpoint}/$1/Categories/$ref", new Dictionay<string, string>
        {
            ["@odata.id"] = $"{endpoint}/Categories(0)"
        })
    }
};

var responses = await odata.SendAsync(batch);
// You can also use BatchAsync. 
// var responses = await odata.BatchAsync(batch);

if (responses.All(res => res.Success)) 
{
    var id = response.First().ReadAs<int>("$.Id");
}

Parameterized Uri

var client = new HttpClient();
var odata = new ODataClient(client);
var request = Request.Get($"{endpoint}/Products?$filter=ReleaseDate ge @Date", new { Date = new DateTimeOffset(new DateTime(2000, 1, 1)) });
var response = await odata.SendAsync(request);

if (response.Success) 
{
    ...
}

And you can use @@ as escape for @.

Set OData Element Type

In default, OData element type is not contained in payload. If you want add element type, you sould use type parameter of Request factory method.

Request.Post("...", payload, type: "ODataDemo.Product")

Change OData Element Type Key

In default, OData element type key is odata.type. If you want change key to other, you should use typeKey parameter of Request factory method.

Request.Post("...", payload, type: "ODataDemo.Product", typeKey: "@odata.type")

Use for OData v3(v2)

If you use for OData v3(v2), you have to change serializer and parametalizer.

1. Global level settings

ODataClient.UseHistoricalGlobal();

2. Client level settings

not yet. If you want, please create issue ticket.

Credential

Basic Auth

var odata = new ODataClient(client, "username", "password");

Custom

You should modify default settings of client which be passed to ODataClient constructor or implemet ICredentialBuilder

public class CustomCredentialBuilder : ODataHttpClient.Credentials.ICredentialBuilder
{
    public void Build(HttpClient client, HttpRequestMessage message)
    {
        // implement custom credential logic.
    }
}

And pass the builder instance to 2nd parameter constructor.

var odata = new ODataClient(client, new CustomCredentialBuilder());

Json Serializer Settings

In default, ODataHttpClient use general json format. If you change OData V2 JSON Serialization Format, can select a way of three.

1. Global level settings

ODataHttpClient.Serializers.JsonSerializer.Default = ODataHttpClient.Serializers.JsonSerializer.Historical;

2. Instance level settings

var odata = new ODataHttpClient(httpClient, ODataHttpClient.Serializers.JsonSerializer.Historical);
var request = odata.RequestFacotry.Get("..."); // MUST use RequestFactory

3. Request level settings

var serializer = ODataHttpClient.Serializers.JsonSerializer.Historical;
var request = Request.Get("...", serializer); // pass serializer
var response = await odata.SendAsync(request);
var data = response.ReadAs<dynamic>(serializer); // pass serializer

NotFound(404)

In default, ODataHttpClient decide 404 response code of GET and HEAD request to success. If you change to error, can select a way of followings.

var request = Request.Get("...", acceptNotFound: false);
var response = await odata.SendAsync(request);

When a response code of other HTTP methods, like as POST,PUT,PATCH and DELETE, is 404, ODataHttpClient set Response.Success false.