c# - 如何从与 linq 的组合框绑定中获取 valuemember？

Question

如何从与 linq 的组合框绑定中获取 valuemember

 cmb_projectName.DataSource = linq1.tbl_Projects.Select(c => new {c.ID,c.ProjectName }).ToList();

int projectID = Convert.ToInt32( cmb_projectName.SelectedValue);

cmb_projectName.DisplayMember = "项目名称"; cmb_projectName.ValueMember = "ID";

---

cmb_projectName.SelectedValue ==> return {ID = 1, ProjectName = "projectname1" }

我想返回 Just ID 值；

有什么问题 ？？！！

Answer 1

您必须ValueMember为您的 设置ComboBox，否则它将是您所看到的：

comboBox1.ValueMember = "ID";
//or
comboBox1.ValueMember = "ProjectName";//It's up to you

然后comboBox1.SelectedValue将返回ID或ProjectName取决于ValueMember您设置，假设您将其设置为"ID"，因此您可以得到SelectedValue这样的：

var id = (int) comboBox1.SelectedValue;

Answer 2

您的情况下的错误代码：

cbo.DataSource = StronglyDataTable.OrderBy(x => x.pName)).Select(x => new { x.pID, x.pName });
cbo.DisplayMember = "pName";
cbo.ValueMember = "pID";

正确的代码：

cbo.DisplayMember = "pName";
cbo.ValueMember = "pID";
cbo.DataSource = StronglyDataTable.OrderBy(x => x.pName)).Select(x => new { x.pID, x.pName });