我有一个VB 2010 Express项目,其中有一个DataGridView,我正在尝试写入CSV文件.
我写的都在工作.但它的速度很慢.慢速=可能30秒,超过8列6000行.
这是我的代码:
Private Sub btnExportData_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles btnExportData.Click Dim StrExport As String = "" For Each C As DataGridViewColumn In DataGridView1.Columns StrExport &= """" & C.HeaderText & """," Next StrExport = StrExport.Substring(0,StrExport.Length - 1) StrExport &= Environment.NewLine For Each R As DataGridViewRow In DataGridView1.Rows For Each C As DataGridViewCell In R.Cells If Not C.Value Is Nothing Then StrExport &= """" & C.Value.ToString & """," Else StrExport &= """" & "" & """," End If Next StrExport = StrExport.Substring(0,StrExport.Length - 1) StrExport &= Environment.NewLine Next Dim tw As IO.TextWriter = New IO.StreamWriter("C:\Test1.CSV") tw.Write(StrExport) tw.Close() End Sub
有谁知道我能做些什么来加快它?
谢谢
你花了几个小时搜索,然后发一个问题,几分钟后自己找到答案,难道你不喜欢它吗?
这对我有用:
Dim headers = (From header As DataGridViewColumn In DataGridView1.Columns.Cast(Of DataGridViewColumn)() _ Select header.HeaderText).ToArray Dim rows = From row As DataGridViewRow In DataGridView1.Rows.Cast(Of DataGridViewRow)() _ Where Not row.IsNewRow _ Select Array.ConvertAll(row.Cells.Cast(Of DataGridViewCell).ToArray,Function(c) If(c.Value IsNot Nothing,c.Value.ToString,"")) Using sw As New IO.StreamWriter("csv.txt") sw.WriteLine(String.Join(",",headers)) For Each r In rows sw.WriteLine(String.Join(",r)) Next End Using Process.Start("csv.txt")