mysql - 如何从 mysql 填充 datagridview 组合框 - vb.net

Question

我有一个 datagridview(有 5 列:4 个文本框和 1 个组合框)，它从 mysql 加载数据。这是我使用的代码，当我在所有文本框列中尝试它时，它工作正常。但是当我将最后一列更改为组合框时，出现错误:

“DataGridView 中发生以下异常:

System.ArgumentException:DataGridViewComboBoxCell 值无效。

要替换此默认对话框，请处理 DataError 事件。”

Private Sub Main_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    sqlconn.ConnectionString = "server=localhost;userid=root;password=12345;database=db_scheduling"
    teacherQuery("SELECT * FROM tbl_teacher ORDER BY id")
End Sub

Sub teacherQuery(ByVal strings)
    Try
        Dim sqlcommand As New MySqlCommand
        Dim sqladapter As New MySqlDataAdapter
        sqlcommand.Parameters.AddWithValue("@id", AddTeacher.txt_AddTeacher_ID.Text)
        sqlcommand.Parameters.AddWithValue("@lname", AddTeacher.txt_AddTeacher_Lname.Text)
        sqlcommand.Parameters.AddWithValue("@fname", AddTeacher.txt_AddTeacher_Fname.Text)
        sqlcommand.Parameters.AddWithValue("@mname", AddTeacher.txt_AddTeacher_Mname.Text)
        sqlcommand.Parameters.AddWithValue("@subject_to_teach", AddTeacher.cmb_AddTeacher_Subject.SelectedItem)
        Dim Table As New DataTable
        With sqlcommand
            .CommandText = strings
            .Connection = sqlconn
        End With
        With sqladapter
            .SelectCommand = sqlcommand
            .Fill(Table)
        End With

        '----HERES THE PROBLEM-----'
        datagrid_Teacher.Rows.Clear()
        For x As Integer = 0 To Table.Rows.Count - 1
            datagrid_Teacher.Rows.Add(Table(x)("id"),
                                      Table(x)("lname"),
                                      Table(x)("fname"),
                                      Table(x)("mname"),
                                      Table(x)("subject_to_teach"))
        Next
        '---------------------------'

        'Bold header
        With datagrid_Teacher.ColumnHeadersDefaultCellStyle
            .Font = New Font(datagrid_Teacher.Font, FontStyle.Bold)
        End With
    Catch ex As Exception
        MessageBox.Show("ERROR: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try
End Sub

编辑:这里的问题是在 datagridview (组合框(subject_to_teach 列))中添加数据

Answer 1

尝试这个而不是 datagrid_Teacher.Rows.Add 方式:

datagrid_Teacher.Datasource = Table;
datagrid_Teacher.Databind();

或者将其添加到您的代码中(Gridview Dataerror 的事件处理程序):

private void ctrldataGridView_DataError(object sender, DataGridViewDataErrorEventArgs e)
       {
          //do nothing
       }