Question

我不认为这有一个重复的问题......但是在这里。我想删除datagridview中的选定行。在按住ctrl并单击鼠标的同时，我将在datagridview中选择多行。问题是，当我单击删除按钮时，将删除唯一的第一个选定行。

这是我的代码：

Private Sub deleteitem()
    Dim result As DialogResult
    result = MessageBox.Show("Are you sure you want to delete selected item/s?", "Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
    If result = DialogResult.Yes Then
        Dim row As DataGridViewRow = DataGridView2.CurrentRow
        cmd.Connection = con
        Dim query As String = "update Items_tbl set itemstatus='UNAVAILABLE' where id=@id"
        Using cmd As New SqlCommand(query, con)
            cmd.Parameters.AddWithValue("@id", row.Cells(0).Value.ToString())
            con.Open()

            For Each Parameter As SqlParameter In cmd.Parameters
                If Parameter.Value Is Nothing Then
                    Parameter.Value = DBNull.Value
                End If
            Next

            cmd.ExecuteNonQuery()
        End Using
        MessageBox.Show("Item/s deleted.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information)
        con.Close()
        txt_ItemName.Clear()
        txt_CostPrice.Clear()
        txt_MarkupPrice.Clear()
        txt_Price.Clear()
        txt_ItemName.Focus()
        form_AdminMainPage.Uc_FileMaintenance_Admin1.loaditems()
        resetitems()
    End If

Answer 1

尝试以下代码：

Dim result As DialogResult
result = MessageBox.Show("Are you sure you want to delete selected item/s?", "Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
If result = DialogResult.Yes Then
    cmd.Connection = con
    For Each row As DataGridViewRow in DataGridView2.SelectedRows
    Dim query As String = "update Items_tbl set itemstatus='UNAVAILABLE' where id=@id"
    Using cmd As New SqlCommand(query, con)
        cmd.Parameters.AddWithValue("@id", row.Cells(0).Value.ToString())
        con.Open()

        For Each Parameter As SqlParameter In cmd.Parameters
            If Parameter.Value Is Nothing Then
                Parameter.Value = DBNull.Value
            End If
        Next
        cmd.ExecuteNonQuery()
    End Using 
    Next
    MessageBox.Show("Item/s deleted.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information)
    con.Close()
    txt_ItemName.Clear()
    txt_CostPrice.Clear()
    txt_MarkupPrice.Clear()
    txt_Price.Clear()
    txt_ItemName.Focus()
    form_AdminMainPage.Uc_FileMaintenance_Admin1.loaditems()
    resetitems()
End If

Answer 2

您需要遍历行，并执行查询，更改每行的参数。这假设您已经打开了连接，因此它只是代码的命令部分。

 Using cmd As New SqlCommand(query, con)
        con.Open()

        Dim param As New SqlParameter()
        param.ParameterName = "@id"
        cmd.Parameters.Add(param)

        For Each r As DataGridViewRow in DataGridView2.SelectedRows

            param.Value = r.Cells(0).Value.ToString()
            cmd.ExecuteNonQuery()
        Next


    End Using

使用multiselect删除datagridview中的选定行

2 个答案: