[英]c#: how to set combobox valuemember from linq query
ok so i have combobox whos datasource are the results of a linq query 好吧所以我有组合框,而数据源是linq查询的结果
//load QA names
var qaNames =
from a in db.LUT_Employees
where a.position == "Supervisor" && a.department == "Quality Assurance"
select new { a, Names = a.lastName + ", " + a.firstName };
cboQASupervisor.DataSource = qaNames;
cboQASupervisor.DisplayMember = "Names";
The problem im having is when i try to add the next line of code 我遇到的问题是当我尝试添加下一行代码时
cboQASupervisor.ValueMember = "ID";
I get an error on runtime that it couldn't cast the anonymous type. 我在运行时遇到错误,
它无法转换匿名类型。 How do i fix this? 我该如何解决?
Correction: The error is: 更正:错误是:
Cannot bind to the new value member.
无法绑定到新值成员。 Parameter name: value
参数名称:value
You specify ID as the value field, but you don't have ID property in your anonymous type. 您将ID指定为值字段,但您的匿名类型中没有ID属性。
Assuming you have ID in your LUT_Employees object: 假设您的LUT_Employees对象中有ID:
var qaNames = (
from a in db.LUT_Employees
where a.position == "Supervisor" && a.department == "Quality Assurance"
select new { a.ID, Names = a.lastName + ", " + a.firstName })
.ToList();
cboQASupervisor.DataSource = qaNames;
cboQASupervisor.DisplayMember = "Names";
cboQASupervisor.ValueMember = "ID";
You can try this: 你可以试试这个:
var qaNames =
from a in db.LUT_Employees
where a.position == "Supervisor" && a.department == "Quality Assurance"
select new { Id = a.ID, Names = a.lastName + ", " + a.firstName };
cboQASupervisor.DataSource = qaNames.ToList();
cboQASupervisor.DisplayMember = "Names";
cboQASupervisor.ValueMember = "Id";
Add .ToList()
to your code in the datasource line. 将
.ToList()
添加到数据源行中的代码中。
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