在此种情况下，可能因为没有正确设置 Dynamics 365 的连线，导致批量更新不起作用。可以检查连接字符串和实体的导出/导入设置是否正确。同时，需要始终将导入的实体与 Dynamics 365 中的实体匹配。

以下是一个示例，用于批量更新 Dynamics 365 中的实体：

using Microsoft.Xrm.Sdk;
using Microsoft.Crm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Query;

namespace UpdateRecords
{
    class Program
    {
        static void Main(string[] args)
        {
            //set up connection to Dynamics 365
            IOrganizationService service = GetService();

            //create query to retrieve all records to be updated
            QueryExpression query = new QueryExpression("entityname");
            query.ColumnSet.AddColumns("field1", "field2", "field3");

            //retrieve all records that match query
            EntityCollection results = service.RetrieveMultiple(query);

            //loop through all retrieved records
            foreach (Entity entity in results.Entities)
            {
                //update fields of entity
                entity["field1"] = "new value";
                entity["field2"] = "new value";
                entity["field3"] = "new value";

                //create update request for entity
                UpdateRequest update = new UpdateRequest { Target = entity };

                //execute update request
                service.Execute(update);
            }
        }

        static IOrganizationService GetService()
        {
            //set up Dynamics 365 connection string
            string connectionString = "AuthType=OAuth;Username=;Password=;Url=;AppId=;RedirectUri=;";

            //create organization service manager based on connection string
            CrmServiceClient crmService = new CrmServiceClient(connectionString);

            //return organization service
            return crmService.OrganizationWebProxyClient != null ? (IOrganizationService)crmService.OrganizationWebProxyClient : (IOrganizationService)crmService.OrganizationServiceProxy;
        }
    }
}