Question

我在Datagridview中的值是

|   warranty  |
---------------
|    0001     |
|    0002     |
|    0003     |
|    0004     |

代码值：

Private Sub UpdateGrid()

    Dim str As String = "select Warranty from TBwarranty"

    ds = New DataSet
    da = New OleDbDataAdapter(str, connection)
    da.Fill(ds, "a")

    DataGridView1.DataSource = ds.Tables("a")

End Sub

请有人真的能告诉我我有此错误的代码有什么问题吗

System.ArgumentOutOfRangeException：'索引超出范围。必须为非负数并且小于集合的大小。参数名称：index'

起初我编码：

 Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click

    Dim c As Integer = DataGridView1.SelectedRows.Count() - 1 

    For i As Integer = 0 To c

        Dim deleteQuery As String = "DELETE from TBwarranty WHERE warranty='" & DataGridView1.SelectedRows(i).Cells(0).Value & "'"

        Try
            T.ExecuteQuery(deleteQuery, connection) 'This my public sub in other class [ command.ExecuteNonQuery() ]
            UpdateGrid()
        Catch ex As System.Data.OleDb.OleDbException
            MsgBox(ex.Message)
            MessageBox.Show("Fail inserted.")
        End Try

    Next

End Sub

然后上面有一个问题错误。

然后我尝试编码：

    Dim c As Integer = DataGridView1.SelectedRows.Count() - 1 

    For i As Integer = 0 To c

        Dim deleteQuery As String = "DELETE from TBwarranty WHERE warranty='" & DataGridView1.SelectedRows(i).Cells(0).Value & "'"
        Console.WriteLine(deleteQuery)

    Next

没有任何错误，输出到控制台是真实值。

我不明白为什么会这样？怎么了以及我该怎么办？感谢您的协助。

Answer 1

根据评论的意见。现在我可以解决错误了。

Dim c As Integer = DataGridView1.SelectedRows.Count() - 1 

    For i As Integer = 0 To c
        Dim deleteQuery As String = "DELETE from TBwarranty WHERE warranty='" & DataGridView1.SelectedRows(i).Cells(0).Value & "'"

        Console.WriteLine(deleteQuery)

        Try
            T.ExecuteQuery(deleteQuery, connection) 
        Catch ex As System.Data.OleDb.OleDbException
            MsgBox(ex.Message)
            MessageBox.Show("Failed inserted.")
        End Try
    Next

    UpdateGrid()

使用Datagridview1.SelectedRows（）。cells（）。value的循环具有“索引超出范围”。 [vb.net]

1 个答案: