列表视图控件为空 [英] List view control is blank

问题描述

这是我填充列表视图的代码，但它不显示任何记录。为什么？

This is my code to populate a list view but it does not show any records. why?

Private Sub populate_studentLvw()
        studentLvw.View = View.Details
        studentLvw.GridLines = True
        studentLvw.FullRowSelect = True
        
       

        cmd = New SqlCommand("select * FROM Students", con)
        Using dr As SqlDataReader = cmd.ExecuteReader
            While dr.Read
                Dim li As New ListViewItem()
                li.Text = Convert.ToString(dr.Item("student_pk"))
                li.SubItems.Add(Convert.ToString(dr.Item("student_fullname")))
                li.SubItems.Add(Convert.ToString(dr.Item("student_branch")))
                li.SubItems.Add(Convert.ToString(dr.Item("student_scholarship")))
                studentLvw.Items.Add(li)
            End While
        End Using
        cmd.Dispose()
        con.Close()
    End Sub

推荐答案

哟你没有在列表视图中添加列。



尝试在添加数据之前将列添加到列表视图。

Hi,
You didnt add columns to List view.

try to add columns to list view before adding data.

Private Sub populate_studentLvw()
        studentLvw.View = View.Details
        studentLvw.GridLines = True
        studentLvw.FullRowSelect = True

// Add your columns here.
        
       studentLvw.Columns.Add("Col1")
        studentLvw.Columns.Add("Col2")
        studentLvw.Columns.Add("Col3")
        studentLvw.Columns.Add("Col4")
       
 
        cmd = New SqlCommand("select * FROM Students", con)
        Using dr As SqlDataReader = cmd.ExecuteReader
            While dr.Read
                Dim li As New ListViewItem()
                li.Text = Convert.ToString(dr.Item("student_pk"))
                li.SubItems.Add(Convert.ToString(dr.Item("student_fullname")))
                li.SubItems.Add(Convert.ToString(dr.Item("student_branch")))
                li.SubItems.Add(Convert.ToString(dr.Item("student_scholarship")))
                studentLvw.Items.Add(li)
            End While
        End Using
        cmd.Dispose()
        con.Close()
    End Sub        

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