ComboBox和实体框架

Question

我在数据表中有ProjectID和Name。 cbProjects是ComboBox。

这是一段代码。

ProjectEntities projectE = new ProjectEntities();
cbProjects.ItemsSource = projectE.Projects;
cbProjects.DisplayMemberPath = "Name";

我可以在ComboBox中获取有关所选名称的ProjectID的信息吗？

Answer 1

private void cbProjects_SelectedIndexChanged(object sender, System.EventArgs e)
{
    ComboBox cb = sender as ComboBox;

    var item = cb.SelectedItem as Project;
    int projectID = item.ProjectID;

}

或

var item = cbProjects.SelectedItem as Project;
int projectID = item.ProjectID;

Answer 2

我正在使用VS 2010和EF 4，这是代码，它对我有用：

//load entities to the combo box
ProjectEntities projectE = new ProjectEntities();
var pdata = projectE.Projects;
cbProjects.DataSource = pdata; //cbProjects.ItemsSource
cbProjects.DisplayMember = "Name"; //cbProjects.DisplayMemberPath

//get selected value
var item = cbProjects.SelectedItem as Project;
int projectID = item.ProjectID;

Answer 3

cbProjects.SelectedValuePath = "ProjectID"

然后，您可以通过cbProjects.SelectedValue获取所选项目的ID。