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我有一个“查看记录”按钮的开始窗体。在记录表单加载事件我有循环填充记录表单上的datagridview。我想要做的是在“开始”表单上的“查看记录”按钮旁边显示一个进度条，当用户单击“查看记录”按钮时，该按钮将显示“记录”窗体上datagridview的进度。然后，一旦datagridview循环成功完成，我想调出记录表单（但仍然将开始表单作为父表单打开，因此“查看记录”表单将由ShowDialog提供）。我有简单的代码来显示“查看记录”按钮点击进度条。我正在阅读，发现可能有一名后台工作人员可能是我需要的，但我不知道如何使用它。有人能帮助我通过它并提供一些代码来帮助我吗？一些信息，开始形式被称为“开始”，而“查看记录”形式被称为“记录”。进度条是名字'pb'。提前感谢任何想尝试帮助的人！如何添加一个进度条来显示窗体按钮点击，显示窗体2的加载进度
好吧，这里有错误
Imports Office = Microsoft.Office.Core
Imports Excel = Microsoft.Office.Interop.Excel
Public Class Start
Dim Records As New Records
Dim excel_app As Excel.Application
Dim workbook As Excel.Workbook
Dim sheet_name As String
Dim sheet As Excel.Worksheet
Dim exeDir As New IO.FileInfo(Reflection.Assembly.GetExecutingAssembly.FullName)
Dim xlPath = IO.Path.Combine(exeDir.DirectoryName, "Records.xlsx")
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
bw.RunWorkerAsync()
End Sub
Private Sub bw_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bw.DoWork
' Get the Excel application object.
excel_app = New Excel.Application
' Make Excel visible (optional).
excel_app.Visible = False
' Open the workbook.
workbook = excel_app.Workbooks.Open(xlPath)
sheet_name = "2013"
sheet = excel_app.Worksheets("2013")
Dim ColumnCount, RowCount, TotalCellCount As Long
ColumnCount = sheet.Range("A1").CurrentRegion.Columns.Count
RowCount = sheet.Range("A1").CurrentRegion.Rows.Count
Records.DataGridView1.ColumnCount = ColumnCount - 1
Records.DataGridView1.RowCount = RowCount - 1
Records.DataGridView1.ColumnHeadersVisible = True
Records.DataGridView1.RowHeadersVisible = True
TotalCellCount = Records.DataGridView1.ColumnCount * Records.DataGridView1.RowCount
pb.Visible = True
pb.Minimum = 0
pb.Value = 0
pb.Maximum = TotalCellCount
Records.DataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing
Records.DataGridView1.AllowUserToResizeColumns = False
Records.DataGridView1.AllowUserToResizeRows = False
Records.DataGridView1.ReadOnly = True
Records.DataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells
'Loop through each column
Dim cIndex As Integer = 0
While cIndex < ColumnCount
'Loop through and populate each row in column
Dim rIndex As Integer = 0
While rIndex < RowCount - 1
If cIndex = 0 Then
'Set row header titles
Records.DataGridView1.Rows.Item(rIndex).HeaderCell.Value = sheet.Range("A1").Offset(rIndex + 1, cIndex).Value()
Records.DataGridView1.Rows(rIndex).Cells(cIndex).Value = sheet.Range("A1").Offset(rIndex + 1, cIndex + 1).Value()
End If
If cIndex > 0 Then
Records.DataGridView1.Rows(rIndex).Cells(cIndex).Value = sheet.Range("A1").Offset(rIndex + 1, cIndex + 1).Value()
End If
'Set column header title
Records.DataGridView1.Columns(cIndex).HeaderText = sheet.Range("A1").Offset(0, cIndex + 1).Value
'Change last cell (Result) color Red or Green to represent positive gain or negative loss
If rIndex = RowCount - 2 Then
If Records.DataGridView1.Rows(rIndex).Cells(cIndex).Value < 0 Then
Records.DataGridView1.Item(cIndex, rIndex).Style.BackColor = Color.Red
Records.DataGridView1.Item(cIndex, rIndex).Style.ForeColor = Color.White
End If
If Records.DataGridView1.Rows(rIndex).Cells(cIndex).Value > 0 Then
Records.DataGridView1.Item(cIndex, rIndex).Style.BackColor = Color.Green
Records.DataGridView1.Item(cIndex, rIndex).Style.ForeColor = Color.White
End If
If Records.DataGridView1.Rows(rIndex).Cells(cIndex).Value = 0 Then
Records.DataGridView1.Rows(rIndex).Cells(cIndex).Value = "Broke Even"
End If
End If
'Update the progress bar after each cell is populated
bw.ReportProgress((rIndex * cIndex)/TotalCellCount)
rIndex = rIndex + 1
End While
'Format all cells in column as currency values
Records.DataGridView1.Columns(cIndex).DefaultCellStyle.Format = "c"
'Make column unsortable
Records.DataGridView1.Columns(cIndex).SortMode = DataGridViewColumnSortMode.NotSortable
'Resize all Row Headers so user can see Row Titles without resizing
Records.DataGridView1.AutoResizeRowHeadersWidth(DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders)
cIndex = cIndex + 1
End While
Records.DataGridView1.AutoResizeColumns()
End Sub
Private Sub bw_ProgressChanged(ByVal sender As Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles bw.ProgressChanged
pb.Value = e.ProgressPercentage
End Sub
Private Sub bw_RunWorkerCompleted(ByVal sender As Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles bw.RunWorkerCompleted
If e.Error IsNot Nothing Then
MessageBox.Show(e.Error.Message, "Background Worker Exception", MessageBoxButtons.OK, MessageBoxIcon.Error)
Else
If e.Cancelled Then
'worker was cancelled
Else
'worker completed, open form2 here
pb.Visible = False
Records.ShowDialog()
If (Records.DialogResult) Then
' Close the workbook.
workbook.Close()
' Close the Excel server.
excel_app.Quit()
End If
End If
End If
End Sub
我这样做正确更新的代码？我该如何解决这个错误？
这个进度条在哪里，Form1,2或者一些额外的表单？你确定延迟是在哪里吗？将代码放入表单加载可能是您最大的问题。一般来说，我会显示表单，然后调用显式方法来完成填充。我只看线程，如果get和process阶段很慢，我会在显示表单之前这样做。或者，如果我希望是异步的，即保持form1可用于其他操作，而“form2”进程正在弄清楚该怎么做。这也将分离获取和显示过程。 –
只是澄清如果Form1是不可用的，并且form2还不能显示，那么对它进行线程化并同步UI是没有意义的复杂性。你需要分开关注点。 –
进度条位于“查看记录”按钮旁边的表单1中，并在单击“查看记录”按钮时显示。我对你说的有点失落。对不起，我很新。我应该将“填充”循环代码移到“记录”表单中的表单加载事件之外吗？如果是这样，那么我如何才能开始循环呢？ – CaffeinatedCoder