HttpClient PostAsync causes System.ArgumentOutOfRangeException

Question

I am working on a Xamarin cross platform project that talks to a web service. The general form of my service calls follows the following pattern:

var clientQuery = new MyClientsQuery(param1, param2);
var json = JsonConvert.SerializeObject(clientQuery);
var content = new StringContent(json, Encoding.UTF8, "application/json");
HttpClient _httpClient = new HttpClient();
response = await _httpClient.PostAsync(ServiceURL, content);
if (response.IsSuccessStatusCode)
{
    json = await response.Content.ReadAsStringAsync();
}

This usually works fine, but after making a few calls during the execution of the app, PostAsync generates the exception:

System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.

Parameter name: index

I suspect that I am running into some sort of connection limit, but I can not find any documentation in System.Net.Http that indicates when I should be disposing of objects or any other clue.

Why is this happening?

That exception is likely coming from the webservice you are calling. Are you sure you are providing valid parameters? — Matti Price
– Matti Price, Commented Jan 13, 2017 at 18:57
Well, to my knowledge, PostAsync will not throw an ArugmentOutOfRangeException . You may be seeing the inner exception returned by the web service you are calling — Matti Price
– Matti Price, Commented Jan 13, 2017 at 19:23
The "full" stack trace really isn't all that full. This is all that shows when the exception is raised 0xB in UIKit.UIApplication.Main at /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/UIKit/UIApplication.cs:79,4 C# 0x3B in UIKit.UIApplication.Main at /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/UIKit/UIApplication.cs:63,4 C# > 0x8 in CSOSA.iOS.Application.Main at C:\Code\CsoApp\CSOSA\CSOSA.iOS\Main.cs:17,13 C# — Robert Lynch
– Robert Lynch, Commented Jan 13, 2017 at 19:46

Henry Mahoney · Accepted Answer · 2021-05-05 20:30:29Z

1

I think you are right with your connection limit. The way I am solving this is to end the previous client connections I have. Once I did that, I stopped getting this error.

For others getting this error, see if you have a lot of other http_clients you have created and end the connections if you can.

answered May 5, 2021 at 20:30

Henry Mahoney

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