组合框未显示DisplayMember

您没有发布Question类，但是DisplayMember和ValueMember字段与Question类中的属性字段不匹配：

它看起来应该像这样：

Public Class Question  Property QuestionID As Integer  Property QuestionText As String  Public Sub New(q_ID As Integer, q_Text As String)    QuestionID = q_ID    QuestionText = q_Text  End SubEnd Class

然后，您的数据源属性将如下所示：

cmbQuestion.DisplayMember = "QuestionID"cmbQuestion.ValueMember = "QuestionID"cmbQuestion.DataSource = retrieveQuestions()