I am upgrading my C# function app from .net 3.1 to 6.0`.
When I run my test cases, I found that, 1 of my test case failed with the below error.
Castle.DynamicProxy.InvalidProxyConstructorArgumentsException : Can not instantiate proxy of class: System.Net.HttpWebRequest. Could not find a parameterless constructor.
Basically, I am trying to mock HttpWebRequest and below is my piece of code for that.
var httpWebRequest = new Mock<HttpWebRequest>();
It is working fine in .Net 3.1. I am using Moq version 4.16.1 in both the projects.
Both HttpWebRequest constructors are obsolete and should not be used. You have to use the static function "Create" to create a new instance of the HttpWebRequest class:
HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create("http://www.contoso.com/");
To solve your issue, use the HttpClient class instead. This class has a parameterless constructor.