Question

我使用以下技术在winforms中填充组合框：

var customer = (new Customer[] { new Customer { CustomerID = -1, CustomerRef = "[Please Select]" } }).Concat(
    from c in ctx.Customers
    orderby c.CustomerRef ascending
    select c).ToList();

cboCustomerRef.DataSource = customer;
cboCustomerRef.ValueMember = "CustomerID";
cboCustomerRef.DisplayMember = "CustomerRef";

是否可以实现相同的结果，但只从客户而不是所有列中选择两个相关列（CustomerID和CustomerRef）。

有更好的方法吗？

谢谢...

Answer 1

试试这个

var customers = 
    from c in ctx.Customers
    orderby c.CustomerRef ascending
    select new { CustomerId = c.CustomerID, CustomerRef = c.CustomerRef }).ToList();

customers.Insert(0, new { CustomerID = -1, CustomerRef = "[Please Select]"});

cboCustomerRef.DataSource = customers;
cboCustomerRef.ValueMember = "CustomerID";
cboCustomerRef.DisplayMember = "CustomerRef";

Answer 2

您可以使用DropDown事件来检索您的数据并进行制作组合框

Customers.Text = [请选择]

默认情况下。

用第一个条目填充Combobox

2 个答案: