Missing compiler required member 'Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create'

When I try and compile C# code using the "dynamic" keyword, I get the error "Missing compiler required member 'Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create'"

I'm building using Visual Studio for Mac

I've googled the error and it seems that you fix it by adding the Microsoft.CSharp.dll, but this will obviously not work on Mac.

Has anyone encountered this?

 

I've come across the exact same issue in 2018.2, Not found a good solution for it yet.

 

We decided to not use the "dynamic" keyword for now, it doesn't seem to be supported.

 

Actually, you just need to set the Api Compatibility Level to .Net 4.x in your Player Settings, if you need to use the dynamic keyword.

 

It's About JIT and AOT compilation. I'm using WEBGL and its AOT. Meaning that it's not supprting new type creation in the Runtime what dynamic key word is.
https://docs.unity3d.com/Manual/ScriptingRestrictions.html

 

just change the Api Compatibility Level to . NET 4.x and Scripting Backend IL2CPP

 

Thank your advice,it's useful!

 

Thank you!!

 

Thank you!! I was so confused, because I already added it to unity and it still complained..

 

thank you!

 

Thanks

 

Can someone help ?
Unity Version is 2021.2.5f
Seting either value doesn't solve the problem, I'm too trying to use the dynamic keyword



In other versions of Unity I can see the .NET 4.x, but in that is not showing

 

did you by any chance find a solution?

 

I am using 2021.1 and it works normally I can use dynamic and .Net 4. In the newer versions the name was changed to just .NET Framework but it should work the same.

PS: Make sure to have installed new C# SDK as well separately.

 

Hello, please I'm trying to install 'Microsoft.CSharp' in my power shell but i get this error: (Error adding package 'Microsoft.CSharp' to project ''. The project does not support adding package references through the add package command) I'm using this command: dotnet add package Microsoft.CSharp --version 4.7.0

 

@JoshPeterson Thanks for this confirmation. Would you have recommendations for workarounds, given that this is a known incompatibility?

 

Any thoughts on what I may be able to use here?

Code (CSharp):

1. public dynamic SendMessage(String messageURI, String messageParams, String authCode = "")
2.     {
3.         byte[] result = this.SendMessage(messageURI, HttpUtility.ParseQueryString(messageParams), authCode);
4.  
5.         string utfString = Encoding.UTF8.GetString(result, 0, result.Length);
6.         return JsonConvert.DeserializeObject<dynamic>(utfString);
7.     }
8.  
9.     public byte[] SendMessage(String messageURI, NameValueCollection messageParams, String authCode = "")
10.     {
11.         using (WebClient client = new WebClient())
12.         {
13.             ServicePointManager.Expect100Continue = true;
14.             ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
15.                     | SecurityProtocolType.Tls11
16.                     | SecurityProtocolType.Tls12
17.                     | SecurityProtocolType.Ssl3;
18.  
19.             client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
20.             if(!String.IsNullOrEmpty(authCode))
21.                 client.Headers[HttpRequestHeader.Authorization] = authCode;
22.  
23.             byte[] HtmlResult = client.UploadValues(messageURI, messageParams);
24.  
25.  
26.             return HtmlResult;
27.         }
28.     }

Which gets used like:

Code (CSharp):

1. var returnData = this.SendMessage(MessageURI, MessageParams, this._authorization);
2.         if (returnData["status"].Equals(1) && returnData["message"].Equals("success"))
3.         {
4.             long.TryParse(returnData["data"]["id"].ToString(), out returnId);
5.         }
6.         return returnId;

 

Thanks for the reply! It doesn't look like that will work.

 

Does this mean we should avoid using the Python Scripting package's Low Level API? It uses the dynamic keyword on its sample code.

 

I am confused here. Are you saying that your own Python scripting package is not going to work well with your own engine? That python package is a Unity provided package, is version 6.x, and is using the dynamic keyword right there on the main page example. (seen below).

I mean, it seems that Unity *can* make use of the dynamic keyword, has for a few years, and if I remember correctly, that python package is relatively newer and it's main purpose was to provide additional integration with and bring Unity more in line with other major DCC suites. Core functionality of that package seems to rely on the dynamic keyword. It seems like it would be a good idea for it to be properly supported, no?

That said, it just seems like perhaps there is a disconnect in information, if one team is phasing out a feature, but another team is relying on it, that doesn't seem like it will turn out great.

 

Then what about this package? Official from Unity, also requires the use "dynamic"

 

This is a joke. We need support for this. It was working fine before for years. How do we pressure Unity into supporting it properly? A bug report?

We can persist with object to some extent for now.

 

unity is a joke on this days compared to unreal

 

Unity 2022.2.0b14 Mono .Net standart 2.0 project. Just put Microsoft.CSharp.dll to Plugins folder and it work. But in first try get an error like "Two same dll delete one of them" but then after delete dll and put it again all work fine.

 

Can confirm this is still not supported.

 

Surely many projects already in production make use of Newtonsoft.Json which does use dynamic to serialize/deserialize types without having to register each one statically, so my guess is that adding Microsoft.CSharp.dll into the project shouldn't introduce any problems. Can anyone confirm?

 

Thanks, Worked for me

 

IL2CPP comment is not accurate. IL2CPP does not support

dynamic

keyword. See official docs. With this in mind, if you are planning to publish your game on, say, iOS,

dynamic

will never work. See scripting backend part of those docs.

If you are publishing on PC or Android (but with Mono scripting backed), then you're all good. Otherwise, you can't use

dynamic

.

Here's snippet from Microsoft docs about IL2CPP limitations

 

@JoshPeterson
I'm passing different custom classes to 1 method using dynamic (currently editor 2020.3.48lts, PC, mono, net 4.x)
Would you have recommendations for workarounds, given that this is a known incompatibility (dynamic) ?

 

You should be able to just use the standard C# object, or make it a generic method?

Code (CSharp):

1. public object myCustomClasses;

Something like this?

Code (CSharp):

1. public void MyMethod<T>(T customClass) where T: class {}

 

@MostHated I have different classes (different names) with same fields (too much serialized data already). Passing them to 1 same method. I need generic method.