本文介绍了一种使用Visual Basic.NET将DataGridView控件中的数据导出到Excel文件的方法。通过创建一个简单的Windows Forms应用程序，演示了如何实现这一功能。文章详细展示了导出过程中的关键步骤，包括设置SaveFileDialog对话框以便用户选择保存位置，以及如何逐行写入数据。
Imports System.IO
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
ExportDataGridViewToExcel(DataGridView1)
End Sub
Public Sub ExportDataGridViewToExcel(ByVal dataGridview1 As DataGridView)
Dim saveFileDialog As SaveFileDialog = New SaveFileDialog
saveFileDialog.Filter = "Execl files (*.xls)|*.xls"
saveFileDialog.FilterIndex = 0
saveFileDialog.RestoreDirectory = True
saveFileDialog.CreatePrompt = True
saveFileDialog.Title = "导出Excel"
saveFileDialog.ShowDialog()
Dim myStream As Stream
myStream = saveFileDialog.OpenFile
Dim sw As StreamWriter = New StreamWriter(myStream, System.Text.Encoding.Unicode)
Dim str As String = ""
Try
Dim i As Integer = 0
While i < dataGridview1.ColumnCount
If i > 0 Then
str += "" & Microsoft.VisualBasic.Chr(9) & ""
End If
str += dataGridview1.Columns(i).HeaderText
i = i + 1
End While
sw.WriteLine(str)
Dim j As Integer = 0
While j < dataGridview1.Rows.Count
Dim tempStr As String = ""
Dim k As Integer = 0
While k < dataGridview1.Columns.Count
If k > 0 Then
tempStr += "" & Microsoft.VisualBasic.Chr(9) & ""
End If
tempStr += dataGridview1.Rows(j).Cells(k).Value.ToString
k = k + 1
End While
sw.WriteLine(tempStr)
j = j + 1
End While
sw.Close()
myStream.Close()
MessageBox.Show("导出成功")
Catch e As Exception
MessageBox.Show(e.ToString & " 发生错误！")
Finally
sw.Close()
myStream.Close()
End Try
End Sub
End Class
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