代码动态创建表单时，如何给基础资料字段赋值？报错求助

var bussnessInfo = MetaDataServiceHelper.GetFormMetaData(this.Context, "ZHY_TEST1").BusinessInfo;
var billDynamicObjectType = bussnessInfo.GetDynamicObjectType();
DynamicObject billobj = new DynamicObject(billDynamicObjectType);

//文本字段赋值OK
bussnessInfo.GetField("FItemClass").DynamicProperty.SetValue(billobj,"JCZL1" );

//供应商基础资料字段赋值，根据供应商名称取得FSupplierId，然后赋值。报int转DynamicObject错误。
var qbp = new QueryBuilderParemeter();
qbp.FormId = "BD_Supplier";
qbp.SelectItems = SelectorItemInfo.CreateItems("FSupplierId", "FName");
qbp.FilterClauseWihtKey = "FName='" + name+"'";
DynamicObjectCollection ret = QueryServiceHelper.GetDynamicObjectCollection(this.Context, qbp);
if(ret.Count>0)
{
bussnessInfo.GetField("FSupplier").DynamicProperty.SetValue(billobj,ret[0]["FSupplierId"] );
}