在使用复选框插入之前检查另一个datagridview中是否已经存在datagridview

Question

我有两个 datagridview，我正在尝试使用单击按钮时的复选框将 datagridview1 中的值插入到 datagridview2。

For i As Integer = DataGridView1.Rows.Count - 1 To 0 Step -1

        Dim c As Boolean
        c = DataGridView1.Rows(i).Cells(0).Value

        If c = True Then
            With DataGridView1.Rows(i)
                DataGridView2.Rows.Insert(0, .Cells(0).Value, .Cells(1).Value, .Cells(2).Value, .Cells(3).Value, .Cells(4).Value, .Cells(5).Value)
            End With
        End If

    Next

我的代码每次插入时都会插入数据。我想防止在 datagridview2 上插入相同的数据。正如您在下图中看到的那样，每次我尝试插入相同的复选框时，我都可以多次添加它。 太感谢了。

这就是我填充 datagridview1 的方式。

 Sub dgv1_SubjectList()
    query = "SELECT subject_id AS '#', subject_name AS 'Descriptive Title', subject_units AS 'Units', sem AS 'Semester', year_level AS 'Year Level' " & _
                " FROM subject WHERE course = '" & cmb_Course.Text & "' AND CURRICULUM = '" & curriculum & "' "
    da = New MySqlDataAdapter(query, myconn)
    da.Fill(ds, "subject")
    DataGridView1.DataSource = ds.Tables(0)
    DataGridView1.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells)
End Sub

在 datagridview2 上，我直接在 datagridview2 中添加空列。

谢谢。抱歉更新晚了。

Answer 1

我已尽力重现您的环境。

        DataGridView1.AllowUserToAddRows = True
    DataGridView2.AllowUserToAddRows = True
    DataGridView1.Rows.Insert(DataGridView1.Rows.Count - 1, True, "Row1Col1", "Row1Col2", "Row1Col3", "Row1Col4", "Row1Col5", "Row1Col6")
    DataGridView1.Rows.Insert(DataGridView1.Rows.Count - 1, True, "Row2Col1", "Row2Col2", "Row2Col3", "Row2Col4", "Row2Col5", "Row2Col6")

    DataGridView2.Rows.Insert(DataGridView2.Rows.Count - 1, False, "Row1Col1", "Row1Col2", "Row1Col3", "Row1Col4", "Row1Col5", "Row1Col6")

    For i As Integer = DataGridView1.Rows.Count - 2 To 0 Step -1

        If DataGridView1.Rows(i).Cells(0).Value Then
            Dim AlreadyInGrid As Boolean = False
            Dim ColumnsCount As Integer = DataGridView1.Columns.GetColumnCount(DataGridViewElementStates.Displayed)
            For j As Integer = DataGridView1.Rows.Count - 2 To 0 Step -1
                For k As Integer = 1 To ColumnsCount - 1
                    If DataGridView1.Rows(i).Cells(k).Value <> DataGridView2.Rows(j).Cells(k).Value Then Exit For
                    AlreadyInGrid = (k = ColumnsCount - 1)
                Next
                If AlreadyInGrid Then Exit For
            Next

            If Not AlreadyInGrid Then
                With DataGridView1.Rows(i)
                    DataGridView2.Rows.Insert(DataGridView2.Rows.Count - 1, False, .Cells(1).Value, .Cells(2).Value, .Cells(3).Value, .Cells(4).Value, .Cells(5).Value, .Cells(6).Value)
                End With
            End If

        End If

    Next

Answer 2

在我看来，您似乎想移动该行，如果是这种情况，您不必担心检查它是否已经存在，因为它无法再次尝试添加它。

        Public Class Form1
            Dim ds As New DataSet
            Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
                'Begin sample setup


                ds.Tables.Add(New DataTable With {.TableName = "Table1"})
                With ds.Tables(0)
                    .Columns.Add("Select", GetType(Boolean))
                    .Columns.Add("ID", GetType(Integer))
                    .Columns.Add("Column2", GetType(String))
                    .Rows.Add(False, 1, "test1")
                    .Rows.Add(False, 2, "test2")
                    .Rows.Add(False, 3, "test3")
                    .Rows.Add(False, 4, "test4")
                End With

                Dim dt As DataTable = ds.Tables(0).Clone
                dt.TableName = "Table2"

                ds.Tables.Add(dt)
                DataGridView1.DataSource = ds.Tables(0)
                DataGridView2.DataSource = ds.Tables(1)
                'end sample setup
            End Sub

            Private Sub ButtonAddToDT2_Click(sender As Object, e As EventArgs) Handles ButtonAddToDT2.Click
                Validate()
                Dim SelRows() As DataRow = ds.Tables(0).Select("Select=True")
                For Each DtRow As DataRow In SelRows
                    ds.Tables(1).ImportRow(DtRow)
                    ds.Tables(0).Rows.Remove(DtRow)
                Next
            End Sub

        End Class

如果您不打算删除该行并且您确实想查看该行是否存在于 datagridview2 中，请告诉我，我们可以对此代码进行一些小的修改。