更新/插入实体上下文后如何刷新下拉列表 [英] How do I refresh dropdownlist after updating/inserting entity context

问题描述

我有一个下拉列表，在我对实体进行更新和插入后，我想刷新以显示新插入的联系人姓名。这是我插入新记录的代码：

I've a dropdownlist that after I make updates and inserts to the entity I would like to refresh to display the newly inserted contact name. Here's my code for inserting the new record:

private void btnCreate_Click(object sender, EventArgs e)
        {
            var nextContact = context.Contacts.OrderBy("it.ContactID DESC").First();
            int nextContactID = nextContact.ContactID + 1;
            string[] name = txtTenant.Text.Split(' ');
            var contact = Contact.CreateContact(nextContactID, name[0].ToString(), name[1].ToString());
            var address = new Address();
            address.Address1 = txtAddress.Text;
            contact.ContactNumber = txtContactNum.Text;
            address.Mortgage = txtMortgage.Text;
            address.RemainingMortgage = txtRemainingMortgage.Text;
            address.Rent = txtRent.Text;
            address.Period = cboPeriod.SelectedIndex;
            address.RentArrears = txtRentArrears.Text;
            address.Rates = txtRates.Text;
            address.RatesUpToDate = chkRates.Checked;
            address.RentArrears = txtRentArrears.Text;
            address.Repairs = txtRepairs.Text;
            //join the new address to the contact
            address.Contact = contact;
            //add new graph to the contact
            context.AddToContacts(contact);
            context.SaveChanges();
        }

推荐答案

插入后调用函数QueryContacts（）

After the insertion call the function QueryContacts()

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