我的程序应该允许用户选择多个文本文件，将内容编译成单个文本文件，然后将其导出到Excel文件中。我已经尝试使用进度条，但它只在主循环完成后才更新，而不是在它期间。一旦循环完成，进度条将立即从最小值跳到最大值。它并没有像它想象的那样缓慢增加。这是我的代码：
public partial class Form1 : Form
{
List<string> path = new List<string>();
Workbook excelworkbook = new Workbook();
Worksheet excelworksheet = new Worksheet("First sheet");
public Form1()
{
InitializeComponent();
}
private void addfiles_Click(object sender, EventArgs e)
{
DialogResult dr = this.selectFiles.ShowDialog();
path.Clear();
if (dr == System.Windows.Forms.DialogResult.OK)
{
// Read the files
foreach (String file in selectFiles.FileNames)
{
try
{
path.Add(file);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
numFiles.Text = path.Count.ToString();
}
}
private void export_Click(object sender, EventArgs e)
{
export.Text = "Exporting...";
export.Enabled = false;
addfiles.Enabled = false;
backgroundWorker1.RunWorkerAsync();
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
try
{
backgroundWorker1.ReportProgress(15); //15% on progress bar
string[] readText = File.ReadAllLines(path[0]);
string[] readText_secondary;
string filename;
int real_length = readText.Length - 3; //create a text file that stores contents temporarily from multiple textfiles first..later will export into an excel file
using (StreamWriter streamWriter = new StreamWriter(string.Concat(Directory.GetCurrentDirectory(), "\\Temp_textfile.txt"), false)) //create temp text file
{
for (int i = 12; i <= real_length; i++)
{
backgroundWorker1.ReportProgress(((i / real_length) * 75) + 15); //suppose to update the UI here
streamWriter.Write(string.Concat(readText[i].Substring(4, 42))); //initial columns
streamWriter.Write(string.Concat(readText[i].Substring(59, 13))); //upperlimit column
if (i != 12)
{
streamWriter.Write(string.Concat(readText[i].Substring(46, 13))); //results column
}
else if (i == 12)
{
filename = Path.GetFileNameWithoutExtension(path[0]); //serial number column
streamWriter.Write(string.Concat(filename + " "));
}
for (int x = 1; x < path.Count; x++)
{
readText_secondary = File.ReadAllLines(path[x]); //secondary files
if (x != (path.Count - 1))
{
if (i != 12)
{
streamWriter.Write(string.Concat(readText_secondary[i].Substring(46, 13))); //write results
}
else if (i == 12)
{
filename = Path.GetFileNameWithoutExtension(path[x]); //write serial number header
streamWriter.Write(string.Concat(filename + " "));
}
}
else
{
if (i != 12)
{
streamWriter.WriteLine(string.Concat(readText_secondary[i].Substring(46, 13))); //write results for last column
}
else if (i == 12)
{
filename = Path.GetFileNameWithoutExtension(path[x]); //write serial number header for last column
streamWriter.WriteLine(string.Concat(filename + " "));
}
}
}
}
}
var lines = File.ReadAllLines(string.Concat(Directory.GetCurrentDirectory(), "\\Temp_textfile.txt"));
var rowcounter = 0;
foreach (var line in lines)
{
var columncounter = 0;
backgroundWorker1.ReportProgress(90);
string[] values = new string[200]; //extract the initial columns
values[0] = line.Substring(0, 10); values[1] = line.Substring(11, 8); values[2] = line.Substring(20, 8); values[3] = line.Substring(29, 12); values[4] = line.Substring(42, 12);
for (int y = 0; y < path.Count; y++)
{
values[5 + y] = line.Substring((55 + (13 * y)), 13); //extract results column
}
foreach (var value in values)
{
excelworksheet.Cells[rowcounter, columncounter] = new Cell(value); //write column by column
columncounter++;
}
rowcounter++;
}
excelworkbook.Worksheets.Add(excelworksheet); //create the excel file from object
string timedate = DateTime.Now.ToString("dd-MM-yyyy");
string excel_name = "\\ExportedData_" + timedate;
int counter = 1;
string new_path = string.Concat(Directory.GetCurrentDirectory() + excel_name + ".xls"); //this part is to prevent overwriting
while (File.Exists(new_path))
{
new_path = string.Concat(Directory.GetCurrentDirectory() + excel_name + "(" + counter + ")" + ".xls");
counter++;
}
excelworkbook.Save(new_path); //save into path
if (File.Exists(string.Concat(Directory.GetCurrentDirectory(), "\\Temp_textfile.txt"))) //delete temporary text file
{
File.Delete(string.Concat(Directory.GetCurrentDirectory(), "\\Temp_textfile.txt"));
}
backgroundWorker1.ReportProgress(100);
}
catch (Exception ex)
{
MessageBox.Show("Error occurred!\n" + ex, "Error Window", MessageBoxButtons.OK, MessageBoxIcon.Warning);
addfiles.Text = "Add Files";
export.Text = "Export!";
numFiles.Clear();
addfiles.Enabled = true;
export.Enabled = true;
}
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
}
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
MessageBox.Show("Done exporting!", "Notification Window", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
addfiles.Text = "Add Files";
export.Text = "Export!";
numFiles.Clear();
addfiles.Enabled = true;
export.Enabled = true;
}
}
我似乎无法解决这里的问题。有人能指出我正确的方向吗？
答案 0 :(得分：0)
backgroundWorker1.ReportProgress(((i / real_length) * 75) + 15);
问题是(i / real_length)因使用integer division而返回0。
相反，您需要这样做：
backgroundWorker1.ReportProgress((int)((((double)i / real_length) * 75) + 15));
或：
backgroundWorker1.ReportProgress(i * 75 / real_length + 15);
我会推荐前者。