ComboBox和實體框架

Question

我在數據表中有ProjectID和名稱。 cbProjects是ComboBox。

這是一段代碼。

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

我可以在ComboBox中獲取有關所選名稱的ProjectID的信息嗎？

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;

}

要么

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

Answer 2

我正在將VS 2010與EF 4結合使用，以下是對我有用的代碼：

//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，您可以通過cbProjects.SelectedValue獲取所選項目的ID。