Question

我有一个datagridview，我已经在那里放了3列（通过设计），但是当我运行这个代码时，它会添加另外3列，并且数据会加载到那些新创建的列中。它怎么能只从我做的列加载数据？

编辑：第一列和第二列是文本框，第三列是组合框。

代码处于表单加载状态：

    Dim sqlDataAdapter As New MySqlDataAdapter
    Dim dt As New DataTable
    Dim bSource As New BindingSource

    Try
        sqlconn.Open()
        Dim query As String
        query = "SELECT * FROM tbl_subject ORDER BY yearlevel, code"
        sqlcommand = New MySqlCommand(query, sqlconn)
        sqlDataAdapter.SelectCommand = sqlcommand
        sqlDataAdapter.Fill(dt)
        bSource.DataSource = dt
        datagrid_Subject.DataSource = bSource
        sqlDataAdapter.Update(dt)

        sqlconn.Close()
    Catch ex As Exception
        MessageBox.Show(ex.Message)
    Finally
        sqlconn.Dispose()
    End Try

Answer 1

DataGridView的列具有属性DataPropertyName，将其值设置为sql查询中的列名。
这将显示预定义列中的数据

正如@Icepickle在评论集datagrid_Subject.AutoGenerateColumns = False中所说的那样这将阻止datagridview为sql查询的SELECT语句中使用的所有字段生成列

Answer 2

只需转到工具箱并拖放datagridview，在属性上命名为dgvSubject 使用上面代码的示例将如下所示;

Dim sqlDataAdapter As New MySqlDataAdapter Dim dt As New DataTable Dim bSource As New BindingSource

Try
    sqlconn.Open()
    Dim query As String
    query = "SELECT * FROM tbl_subject ORDER BY yearlevel, code"
    sqlcommand = New MySqlCommand(query, sqlconn)
    sqlDataAdapter.SelectCommand = sqlcommand
    sqlDataAdapter.Fill(dt)
    bSource.DataSource = dt
    dgvSubject.DataSource = bSource
    sqlDataAdapter.Update(dt)

    sqlconn.Close()
Catch ex As Exception
    MessageBox.Show(ex.Message)
Finally
    sqlconn.Dispose()
End Try

VB.net从Mysql将数据加载到datagridview

2 个答案: