我有一个WPF应用程序，允许用户选择一个到多个电子表格，并执行清理数据和写出管道分隔文件的过程。我正在尝试使用后台工作程序来显示进度条。我遇到的问题是我有backgroundworker_DoWork例程来执行读取excel文件，清理数据并写出数据。对于每个电子表格，允许用户指定数据的范围或让Excel确定范围。我为这个输入调用了一个对话框。我得到错误＆＃34;调用线程必须是STA，因为许多UI组件都需要这个。＆＃34;我一直试图找到一个解决方案，但我尝试的一切都没有用。
这是我的代码。我已将评论放在违规代码的位置以及到目前为止我尝试过的内容。
private void ProcessFiles()
{
int intNumFiles = 0;
string strFileType = "";
int intPos = 0;
string strMsg = "";
intNumFiles = strExFileNames.Length;
foreach (string strInputFile in strExFileNames)
{
intPos = strInputFile.LastIndexOf(".");
strFileType = strInputFile.Substring(intPos + 1);
if(!blnEXTextFileFound)
{
strExcelInputFile = strInputFile;
if (blnExParamCancel || blnMWCancel)
{
strMsg = "Processing has been cancelled.";
System.Windows.MessageBox.Show(strMsg);
break;
}
prgExcelProgress.Visibility = Visibility.Visible;
txtExcelPercent.Visibility = Visibility.Visible;
EnterExcelStateRunning();
try
{
bgwExcelRunner.RunWorkerAsync(strInputFile);
}
catch (Exception ex)
{
System.Windows.MessageBox.Show("Trying to run the Excel/Text file clean process resulted in this error: " + ex.Message, " Error");
prgExcelProgress.Foreground = new SolidColorBrush(Colors.DarkRed);
prgExcelProgress.Value = 100;
}
//ReadWriteExcelData(strInputFile);
}
else
{
if (blnEXTextFileFound)
{
ProcessDelimitedFile(strInputFile);
}
else
{
strMsg = "File type " + strFileType + " is not supported.";
strMsg += " Please contact support.";
System.Windows.MessageBox.Show(strMsg);
}
}
}
prgExcelProgress.Value = 100;
//prgIndicator.Width = 400;
//lblPrctPrgrs.Content = "100%";
//grdProgressIndicator.InvalidateVisual();
//System.Windows.Forms.Application.DoEvents();
//Thread.Sleep(2000);
//txtIndicator.Text = "All files have been processed and created in " + strExOutputPath + ".";
blnDoForAll = false;
}
private void bgwExcelRunner_DoWork(object sender, DoWorkEventArgs e)
{
Excel.Application xlApp;
Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet;
Excel.Range range, colrange, rowrange;
string strCellData, strMsg;
string strDataRow = "";
long lngNumRows, lngNumCols = 0;
long intModNumber, lngProgressPct = 0;
double dblProgress = 0;
double dblProgressPct = 0;
string strOutputFileName = "";
int intPos, intProgress = 0;
string strSubFileName = "";
string strFullOutputFileName = "";
string strOutName = "";
long lngColCnt;
string[] strWSNames = new string[0];
Type typCellType;
bool blnMultiWS = false;
string strNumberFormat;
string strFileName = (string)e.Argument;
//string strFileName = (string)((object[])e.Argument)[0];
intPos = strFileName.IndexOf(".");
strSubFileName = strFileName.Substring(0, intPos);
strOutputFileName = strFileName.Substring(strFileName.LastIndexOf("\\") + 1);
strOutName = strOutputFileName.Substring(0, strOutputFileName.IndexOf("."));
xlApp = new Excel.Application();
xlWorkBook = xlApp.Workbooks.Open(strFileName, 0, true, 5, "", "", true,
Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
Excel.Sheets excelSheets = xlWorkBook.Worksheets;
if (excelSheets.Count > 1)
{
blnMultiWS = CheckMultipleWorksheets(excelSheets);
if (!blnMultiWS)
{
Array.Clear(strChoosenNames, 0, strChoosenNames.Length);
Array.Resize(ref strChoosenNames, 1);
strChoosenNames[0] = strOutName;
}
}
else
{
Array.Resize(ref strChoosenNames, 1);
strChoosenNames[0] = strOutName;
}
if (blnMWCancel)
{
strMsg = "Processing has been cancelled.";
System.Windows.MessageBox.Show(strMsg);
goto ReadWriteExcelDataExit;
}
foreach (string strCurrWSName in strChoosenNames)
{
//grdProgressIndicator.Visibility = Visibility.Visible;
//txtIndicator.Text = "File: " + strCurrWSName;
//prgIndicator.Width = 0;
//lblPrctPrgrs.Content = "0%";
//System.Windows.Forms.Application.DoEvents();
//txtIndicator.Text = " Processing File: " + strCurrWSName + ". Please wait...";
strFullOutputFileName = strExOutputPath + "\\" + strCurrWSName + "_duc.txt";
//if (strChoosenNames.Length > 1)
//{
// xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets[strCurrWSName];
//}
//else
//{
// xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
//}
try
{
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets[strCurrWSName];
}
catch (Exception exQuery)
{
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
}
if (!blnDoForAll)
{
// I ALSO TRIED TO USE A THREAD. THIS SEEMS TO WORK EXCEPT THAT IT PROCESSING DOESN'T RUN IN THE FOREGROUND SO IT FALLS TO THE CODE AFTER BEFORE THE DIALOG IS DISPLAYED
//Thread thread = new Thread(() =>
//{
// ExcelRowColInfo ercWin = new ExcelRowColInfo(xlWorkSheet.Name);
// ercWin.Left = System.Windows.Application.Current.MainWindow.Left + 15;
// ercWin.Top = System.Windows.Application.Current.MainWindow.Top + 15;
// ercWin.ShowDialog();
// blnExParamCancel = ercWin.blnExCancel;
// strExcelStartCol = ercWin.strStartCol;
// strExcelEndCol = ercWin.strEndCol;
// lngExcelStartRow = ercWin.lngStartRow;
// lngExcelEndRow = ercWin.lngEndRow;
// blnLetExcelDecide = ercWin.blnExcelDecide;
// blnDoForAll = ercWin.blnDoForAll;
//});
//thread.SetApartmentState(ApartmentState.STA);
//thread.IsBackground = false;
//thread.Start();
// THIS IS ONE ATTEMPT TO USE A DISPATCHER, STILL GET THE STA ERROR
//ExcelRowColInfo ercWin = new ExcelRowColInfo(xlWorkSheet.Name);
//ercWin.Left = System.Windows.Application.Current.MainWindow.Left + 15;
//ercWin.Top = System.Windows.Application.Current.MainWindow.Top + 15;
//ercWin.Dispatcher.BeginInvoke
// (
// System.Windows.Threading.DispatcherPriority.Normal,
// (Action)(() =>
// {
// ercWin.ShowDialog();
// blnExParamCancel = ercWin.blnExCancel;
// }
// )
// );
//这就是错误发生的地方
ExcelRowColInfo ercWin = new ExcelRowColInfo(xlWorkSheet.Name);
ercWin.Left = System.Windows.Application.Current.MainWindow.Left + 15;
ercWin.Top = System.Windows.Application.Current.MainWindow.Top + 15;
ercWin.ShowDialog();
blnExParamCancel = ercWin.blnExCancel;
if (blnExParamCancel)
{
prgExcelProgress.Foreground = new SolidColorBrush(Colors.LightPink);
Dispatcher.BeginInvoke((Action)delegate
{
prgExcelProgress.Value = 100;
txtExcelPercent.Text = "Process has been cancelled";
});
blnExParamCancel = false;
goto ReadWriteExcelDataExit;
}
strExcelStartCol = ercWin.strStartCol;
strExcelEndCol = ercWin.strEndCol;
lngExcelStartRow = ercWin.lngStartRow;
lngExcelEndRow = ercWin.lngEndRow;
blnLetExcelDecide = ercWin.blnExcelDecide;
blnDoForAll = ercWin.blnDoForAll;
if (blnLetExcelDecide)
{
range = xlWorkSheet.UsedRange;
}
else
{
Excel.Range c1 = xlWorkSheet.Cells[lngExcelStartRow, strExcelStartCol];
Excel.Range c2 = xlWorkSheet.Cells[lngExcelEndRow, strExcelEndCol];
range = (Excel.Range)xlWorkSheet.get_Range(c1, c2);
}
colrange = range.Columns;
lngNumCols = colrange.Count;
rowrange = range.Rows;
lngNumRows = rowrange.Count;
if (lngNumRows < 10)
{
intModNumber = lngNumRows;
}
else
{
intModNumber = lngNumRows / 10;
}
if (System.IO.File.Exists(@strFullOutputFileName))
{
System.IO.File.Delete(@strFullOutputFileName);
}
object[,] values = (object[,])range.Value;
long NumRow = 1;
using (StreamWriter file = new StreamWriter(@strFullOutputFileName, true, Encoding.GetEncoding("iso-8859-1")))
{
while (NumRow <= values.GetLength(0))
{
strDataRow = "";
for (lngColCnt = 1; lngColCnt <= lngNumCols; lngColCnt++)
{
if (values[NumRow, lngColCnt] == null)
{
typCellType = typeof(System.String);
}
else
{
typCellType = values[NumRow, lngColCnt].GetType();
}
strCellData = Convert.ToString(values[NumRow, lngColCnt]);
if (typCellType == typeof(System.DateTime))
{
strCellData = strCellData.Substring(0, strCellData.IndexOf(" "));
}
else
{
if (typCellType == typeof(System.Decimal))
{
if (Convert.ToDecimal(values[NumRow, lngColCnt]) == 0)
{
strCellData = Convert.ToString(0);
}
else
{
strCellData = Convert.ToString(values[NumRow, lngColCnt]);
}
}
else
{
if (typCellType != typeof(System.String))
{
strNumberFormat = range[NumRow, lngColCnt].NumberFormat.ToString();
if (strNumberFormat != "General" && strNumberFormat != "Text" && strNumberFormat != "@")
{
if (typCellType == typeof(System.Double))
{
if (strNumberFormat.IndexOf("[Red]") > 0)
{
strCellData = Convert.ToString(range[NumRow, lngColCnt].Value2);
}
else
{
double dblCellValue = double.Parse(strCellData);
strCellData = dblCellValue.ToString(strNumberFormat);
}
}
}
}
}
}
if (strCellData == null)
{
strCellData = string.Empty;
}
else
{
strCellData = strCellData.Replace("\r\n", " ").Replace("\n", " ").Replace("\r", " ");
}
if (lngColCnt == lngNumCols)
{
strDataRow += strCellData;
}
else
{
strDataRow += strCellData + "|";
}
}
file.WriteLine(strDataRow);
if (NumRow % intModNumber == 0)
{
lngProgressPct = (NumRow / lngNumRows);
bgwExcelRunner.ReportProgress((int)lngProgressPct);
}
NumRow++;
}
}
releaseObject(xlWorkSheet);
}
xlWorkBook.Close(false, null, null);
ReadWriteExcelDataExit:
blnMWCancel = false;
xlApp.Quit();
releaseObject(xlWorkBook);
releaseObject(xlApp);
}
这是ExcelRowColInfo窗口的入口点。
public ExcelRowColInfo(string strWSName)
{
InitializeComponent();
strCurrWSName = string.Copy(strWSName);
InitializeExcelParams();
}
我尝试将[STAThread]置于此之上但收到错误＆＃34; Attributre＆＃39; STAThread＆＃39;对此声明类型无效。它仅适用于＆＃39; Method＆＃39;声明。
我该如何正确地做到这一点？