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I am trying to get all the streaming locators for a given asset using the v3 API and the Microsoft.Azure.Management.Media package but I am getting a bad request error using Odata Queries:

It fails on this line: var locator = client.StreamingLocators.List("webinars", "webinars", new ODataQuery<StreamingLocator>(x=>x.AssetName == assetId));

Microsoft.Azure.Management.Media.Models.ApiErrorException: Operation returned an invalid status code 'BadRequest'

When I use it without the ODataQuery, it returns fine.

public IList<string> GetLocatorForAsset() 
 var assetId = "bb4953cf-4793-4b3c-aed8-ae1bec88a339";
 IList<string> streamingUrls = new List<string>(); 

 var locator = client.StreamingLocators.List("webinars", "webinars", new ODataQuery<StreamingLocator>(x=>x.AssetName == assetId));
 ListPathsResponse paths = client.StreamingLocators.ListPaths("webinars", "webinars", locator.FirstOrDefault().Name);

 foreach (StreamingPath path in paths.StreamingPaths) 
 UriBuilder uriBuilder = new UriBuilder();
 uriBuilder.Scheme = "https";
 uriBuilder.Host = "webinars-use2.streaming.media.azure.net";

 uriBuilder.Path = path.Paths[0];
 streamingUrls.Add(uriBuilder.ToString());
 

 return streamingUrls;

 
 }

As per media services filtering documentation, user can filter "Streaming Locators" only by "name", "properties.created" and "properties.endTime".

https://docs.microsoft.com/en-us/azure/media-services/latest/entities-overview#streaming-locators

In your example, you are trying to filter using assetId/assetName which is not supported. hence 400 Bad request error. see detailed error example in postman

Here is the valid filtering example using Streaming Locator "name" tag.

NOTE : This is not an asset Tag

C# example used to successfully filter streaming locator using "name"

 try
 
 // GUID need to be specified in single quote. using OData v 3.0
 var odataquery = new ODataQuery<StreamingLocator>("name eq '65a1cb0d-ce7c-4470-93ac-fedf66450ea0'");
 IPage<StreamingLocator> locators = client.StreamingLocators.List("mediatest", "mymediatestaccount", odataquery);

 Console.WriteLine(locators.FirstOrDefault().Name);
 Console.WriteLine(locators.FirstOrDefault().StreamingLocatorId);
 Console.WriteLine(locators.FirstOrDefault().Id);

 ListPathsResponse paths = client.StreamingLocators.ListPaths("mediatest", "mymediatestaccount", locators.FirstOrDefault().Name);

 foreach (StreamingPath path in paths.StreamingPaths)
 
 UriBuilder uriBuilder = new UriBuilder();
 uriBuilder.Scheme = "https";
 uriBuilder.Host = "webinars-use2.streaming.media.azure.net";

 uriBuilder.Path = path.Paths[0];
 Console.WriteLine(uriBuilder.ToString());
 
 
 catch (Exception ex)
 
 Console.WriteLine(ex.ToString());
 

I hope this helps.