将fileStream的内容放入数据集中

Question

我想读一读来自XtrapivotGrid of DevExpress的“流”。我可以将它保存在计算机中，但我想要的是将它保存在我的dataset中的一个名为dataset1的表中。现在，我有允许将其保存在目录Temp:.

Using FS As New IO.FileStream("D:\Temp\qqc.layout", IO.FileMode.Create)
     PivotGridControl1.SaveLayoutToStream(FS)
End Using

Dim read As New System.IO.FileStream("D:\Temp\qqc.layout", IO.FileMode.Open, IO.FileAccess.Read)
DataSet1.LayoutMainRapport.ReadXml(read)
DataSet1.AcceptChanges()
read.Close()

表LayoutMainRapport有3列：

• ID(国际)
• 姓名(nvarchar(50))
• 内容(Xml)

流的输出是xml。

提前谢谢！

Answer 1

我只需为xml保存一个名称，然后将其保存到我的数据集中。

    Dim saveDialog As SaveLayout = New SaveLayout
    If saveDialog.ShowDialog() = Windows.Forms.DialogResult.OK Then
        Dim read As New IO.MemoryStream
        PivotGridControl1.SaveLayoutToStream(read)
        read.Position = 0
        Dim lecteur As New IO.StreamReader(read)
        Dim ligne As DataRow = DataSet1.LayoutMainRapport.NewRow()

        ligne("Nom") = saveDialog.txtNom.Text
        ligne("Contenu") = lecteur.ReadToEnd()
        DataSet1.LayoutMainRapport.Rows.Add(ligne)
        LayoutMainRapportTableAdapter.Update(DataSet1)
    End If

Answer 2

我认为您应该将保存的布局转换为字符串，然后将此字符串保存到数据库中(当然，您可以从数据库字符串值加载此布局)：

Private Function SaveLayoutToString(ByVal dxControl As DevExpressControl) As String
    Using ms As MemoryStream = New MemoryStream()
        dxControl.SaveLayoutToStream(ms)
        Return Convert.ToBase64String(ms.ToArray())
    End Using
End Function
Private Sub RestoreLayoutFromString(ByVal dxControl As DevExpressControl, ByVal layout As String)
    If String.IsNullOrEmpty(layout) Then
        Return
    End If
    Using ms As MemoryStream = New MemoryStream(Convert.FromBase64String(layout))
        dxControl.RestoreLayoutFromStream(ms)
    End Using
End Sub

这里DevExpressControl dxControl是DevExpress控件，它支持存储和加载布局(XtraPivotGrid、XtraGrid、XtraLayoutControl等)。