PlatformNotSupportedException: Dynamic code generation is not supported on this platform when using ServiceClient

[rajyraman]

When using Microsoft.PowerPlatform.Dataverse.Client inside a C# single file and then dotnet run on it with .NET 10, ServiceClient throws a PlatformNotSupportedException during ConnectAndInitServiceAsync initialization. Seems this is similar to #501

This was the code I tried to run

// .NET 10 Top-level statements
#:package Azure.Identity@*
#:package Microsoft.PowerPlatform.Dataverse.Client@*

using System;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.PowerPlatform.Dataverse.Client;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using Azure.Identity;
using Azure.Core;

var resourceUrl = "https://xxxxx.crm6.dynamics.com";

// Initialize ServiceClient
var serviceClient = new ServiceClient(new Uri(resourceUrl), async (string resource) => {
    var credential = new DefaultAzureCredential();
    var tokenContext = new TokenRequestContext(new[] { $"{resourceUrl}/.default" });
    var token = await credential.GetTokenAsync(tokenContext);
    return token.Token;
});

if (!serviceClient.IsReady) {
    Console.WriteLine($"Failed to connect to Dataverse: {serviceClient.LastError}");
    return;
}


// Query records using FetchXML
var fetchXml0 = @"<fetch mapping=""logical"" count=""1""><entity name=""account""><attribute name=""parentaccountid"" /><filter type=""or""><condition attribute=""parentaccountid"" operator= ""eq"" value= ""{449207C6-02A5-ED11-AAD1-00224892B4A1}"" /><filter type=""and"" ><condition attribute=""accountid"" operator= ""eq"" value= ""{449207C6-02A5-ED11-AAD1-00224892B4A1}"" /><condition attribute=""parentaccountid"" operator= ""not-null"" /></filter></filter></entity></fetch>";
var results0 = await serviceClient.RetrieveMultipleAsync(new FetchExpression(fetchXml0));
Console.WriteLine($"Retrieved {results0.Entities.Count} records");

Stack trace:

System.PlatformNotSupportedException: Dynamic code generation is not supported on this platform.
   at System.Reflection.Emit.AssemblyBuilder.ThrowDynamicCodeNotSupported()
   at System.Reflection.Emit.AssemblyBuilder.EnsureDynamicCodeSupported()
   at System.Reflection.Emit.AssemblyBuilder.DefineDynamicAssembly(AssemblyName name, AssemblyBuilderAccess access, IEnumerable`1 assemblyAttributes, Assembly callingAssembly)
   at System.Reflection.DispatchProxyGenerator.ProxyAssembly..ctor(AssemblyLoadContext alc)
   at System.Reflection.DispatchProxyGenerator.<>c.<CreateProxyInstance>b__6_0(AssemblyLoadContext x)
   at System.Runtime.CompilerServices.ConditionalWeakTable`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at System.Reflection.DispatchProxyGenerator.CreateProxyInstance(Type baseType, Type interfaceType, String interfaceParameter, String proxyParameter)
   at System.Reflection.DispatchProxy.Create[T,TProxy]()
   at System.ServiceModel.Channels.ServiceChannelProxy.CreateProxy[TChannel](MessageDirection direction, ServiceChannel serviceChannel)
   at System.ServiceModel.Channels.ServiceChannelFactory.CreateProxy[TChannel](MessageDirection direction, ServiceChannel serviceChannel)
   at System.ServiceModel.Channels.ServiceChannelFactory.CreateChannel[TChannel](EndpointAddress address, Uri via)
   at System.ServiceModel.ChannelFactory`1.CreateChannel(EndpointAddress address, Uri via)
   at System.ServiceModel.ChannelFactory`1.CreateChannel()
   at System.ServiceModel.ClientBase`1.CreateChannel()
   at System.ServiceModel.ClientBase`1.CreateChannelInternal()
   at System.ServiceModel.ClientBase`1.get_Channel()
   at System.ServiceModel.ClientBase`1.get_InnerChannel()
   at Microsoft.PowerPlatform.Dataverse.Client.ConnectionService.ConnectAndInitServiceAsync(OrganizationDetail orgdata, Boolean IsOnPrem, Uri homeRealmUri)
   at Microsoft.PowerPlatform.Dataverse.Client.ConnectionService.DoDirectLoginAsync(Boolean IsOnPrem)
   at Microsoft.PowerPlatform.Dataverse.Client.ConnectionService.InitServiceAsync()
   at Microsoft.PowerPlatform.Dataverse.Client.ConnectionService.GetCachedService(ConnectionService& ConnectionObject)
   at Microsoft.PowerPlatform.Dataverse.Client.ConnectionService.IntilizeService(ConnectionService& ConnectionObject)
   at Microsoft.PowerPlatform.Dataverse.Client.ConnectionService.DoLogin(ConnectionService& ConnectionObject)
   at Microsoft.PowerPlatform.Dataverse.Client.ServiceClient.CreateServiceConnection(...)