LookUpEdit绑定到两个BindingSources时不起作用

Question

我遇到一个问题，LookUpEdit的值未在DataBindings添加的DataSource中更新。我所做的是我对表单进行LookUpEdit控制并设置了LookUpEdit DataSource，Value和DisplayMember。然后我添加了DataBindings第二个BindingSource，其中LookUpEdit中的更改值未在第二个BindingSource中更新：

BindingSource bindingSource1 = // here i get IQueryable 
BindingSource bindingSource2 = // here i get IQueryable where one field from bindingSource1 is set as foreign key

lookUpEdit1.Properties.DataSource = bindingSource1.
lookUpEdit1.Properties.ValueMember = "Id";
lookUpEdit1.Properties.DisplayMember = "Name";

lookUpEdit1.DataBindings.Add("EditValue", bindingSource2, "fk_id", true,     DataSourceUpdateMode.OnPropertyChanged);

有时候我会System.Data.Linq.ForeignKeyReferenceAlreadyHasValueException was unhandled too。第二个BindingSource设置为GridControl的DataSource，即GridView。

Answer 1

设置gridView1.OptionsBehavior.CacheValuesOnRowUpdating = CacheRowValuesMode.Disabled。