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？
原文链接：https://www.f2er.com/vb/255863.html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")