組合框和實體框架

Question

我有數據表中的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中獲得有關所選名稱的ProjectID的信息嗎？

Answer 1

cbProjects.SelectedValuePath = "ProjectID" 

然後你就可以通過cbProjects.SelectedValue獲得所選項目的ID。

Answer 2

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 3

我使用VS 2010年EF 4，這裏是這是爲我工作的代碼：

//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;