Dynamics Community Forum Thread Details

i am trying to update multioptionset field to deselect all values. i am updating it using OptionsetValueCollection successfully but when OptionsetValueCollection has 0 items, update is throwing an error "input string not in a correct format"

Here is the code:

OptionSetValueCollection values = new OptionSetValueCollection();

foreach (var item in list)
{
values.Add(new OptionSetValue(Convert.ToInt32(item)));
}

Entity customEntity= new Entity("new_customentity");
customEntity.Id = context.PrimaryEntityId;
customEntity["multiselectoptionsetfieldname"] = values;
service.Update(customEntity);

Error :

Exception Details Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=9.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Unexpected exception from plug-in (Execute): Workflowassemblyname.Workflows.CopyToMultiSelectValues: System.FormatException: Input string was not in a correct format.Detail: <OrganizationServiceFault xmlns:i="www.w3.org/.../XMLSchema-instance" xmlns="schemas.microsoft.com/.../Contracts"> <ActivityId>affb334b-2b57-4bfd-bd79-e08c05b15b81</ActivityId> <ErrorCode>-2147220956</ErrorCode> <ErrorDetails xmlns:d2p1="schemas.datacontract.org/.../System.Collections.Generic" /> <Message>Unexpected exception from plug-in (Execute): ImprovementFoundation.CommissioningSystem.Workflows.CopyToMultiSelectValues: System.FormatException: Input string was not in a correct format.</Message> <Timestamp>2018-08-16T05:23:12.5238074Z</Timestamp> <ExceptionRetriable>false</ExceptionRetriable> <ExceptionSource>PluginExecution</ExceptionSource> <InnerFault i:nil="true" /> <OriginalException>System.FormatException at System.Activities.WorkflowApplication.Invoke(Activity activity, IDictionary`2 inputs, WorkflowInstanceExtensionManager extensions, TimeSpan timeout) at System.Activities.WorkflowInvoker.Invoke(Activity workflow, IDictionary`2 inputs, TimeSpan timeout, WorkflowInstanceExtensionManager extensions) at System.Threading.Tasks.Task`1.InnerInvoke() at System.Threading.Tasks.Task.Execute() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at Microsoft.Crm.Sandbox.SandboxAppDomainHelper.Execute(IOrganizationServiceFactory organizationServiceFactory, String customActivityTypeName, IExecutionContext requestContext, Dictionary`2 sandboxServices, Boolean useDrawbridgeEnabled, Boolean chaosFailAppDomain) at Microsoft.Crm.Sandbox.SandboxAppDomainHelper.Execute(IOrganizationServiceFactory organizationServiceFactory, String customActivityTypeName, IExecutionContext requestContext, Dictionary`2 sandboxServices, Boolean useDrawbridgeEnabled, Boolean chaosFailAppDomain) at Microsoft.Crm.Sandbox.SandboxWorker.ExecuteCustomWorkflowActivity(SandboxCallInfo callInfo, SandboxCustomActivityExecutionContext requestContext, Guid pluginAssemblyId, Int32 sourceHash, String assemblyName, Guid pluginTypeId, String pluginTypeName, SandboxRequestCounter& workerCounter, Boolean returnTraceInfo)</OriginalException> <TraceText> inside execute. Multi select text values. comma seperated text values. Multi select field name.if_specifyreasonspatientnonattendencemulti update outcome report </TraceText> </OrganizationServiceFault> Server stack trace: at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc) at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout) at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation) at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at Microsoft.Crm.Sandbox.ISandboxHost.ExecuteCustomWorkflowActivityAndReturnTraceInfo(SandboxCallInfo callInfo, SandboxCustomActivityExecutionContext requestContext, Guid pluginAssemblyId, Int32 sourceHash, String assemblyName, Guid pluginTypeId, String pluginTypeName, String assemblyContents, Boolean returnTraceInfo) at Microsoft.Crm.Sandbox.SandboxCustomActivity.Execute(SandboxClient client, SandboxCallTracker callTracker, IExecutionContext requestContext, String assemblyContents, Boolean returnTraceInfo) at Microsoft.Crm.Sandbox.SandboxCodeUnit.ExecuteInternal(SandboxClient client, IExecutionContext context, SandboxTraceContext sandboxTraceContext, SandboxCallTracker callTracker, Guid parentExecutionId, String assemblyContents, Boolean& isSafeToRetry, Boolean& executeDone) at Microsoft.Crm.Sandbox.SandboxCodeUnit.<>c__DisplayClass24_0.<Execute>b__0() Exception Details-Details of the exception.

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=9.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Unexpected exception from plug-in (Execute): ImprovementFoundation.CommissioningSystem.Workflows.CopyToMultiSelectValues: System.FormatException: Input string was not in a correct format.Detail: