Question

下面是我试图用来将GridViewRow中的值转换为DataRow对象的循环（使用Visual Basic的Godforsaken语言）。但是，在这一行：

                dr(i) = r.Cells(i).Text

我不断收到以下错误消息：

the value of type string cannot be converted to system.data.datarow

有人能指出我正确的方向如何做到这一点？

        Dim rows As New List(Of GridViewRow)()

        For Each item As GridViewRow In grdExpProd.Rows
            rows.Add(item)
        Next

        Dim value As Integer = rows.Count

        Dim dt As New DataTable()


        For index As Integer = value - 1 To 0 Step -1
            Dim dr As DataRow()
            Dim r As GridViewRow = rows(index)

            For i As Integer = 0 To r.Cells.Count - 1
                dr(i) = r.Cells(i).Text
            Next

            dt.Rows.Add(dr)
        Next

Answer 1

我相信您需要将文本添加到DataRows Item Property，这样您才能访问DataRow的各个单元格。您还需要将GridRowView中存在的列添加到新的DataTable。

For i = 1 To rows(0).Cells.Count
    dt.Columns.Add("Header" & i)
Next

For index As Integer = value - 1 To 0 Step -1
    Dim dr As DataRow = dt.NewRow()
    Dim r As GridViewRow = rows(index)

    For i As Integer = 0 To r.Cells.Count 
        dr.Item(i) = r.Cells(i).Text
    Next

    dt.Rows.Add(dr)
Next

Answer 2

您意外地将dr创建为DataRow对象数组，而不是单个DataRow对象。尝试替换

Dim dr As DataRow()

与

Dim dr As New DataRow()

Answer 3

尝试替换

Dim dr As DataRow()

与

Dim dr As DataRow = dt.NewRow()

另外，正如另一张海报所指出的那样，在尝试向其中添加行之前，需要在数据表中创建列。

在Visual Basic中将GridViewRow数据导入DataRow

3 个答案: