Backgroundworker dowork事件
string CurrentFileWithPath;
private void _FileProcessingWorker_DoWork(object sender, DoWorkEventArgs e)
{
try
{
DirectoryInfo[] MySubDirectories = (DirectoryInfo[])e.Argument;
for (int i = 0; i < MySubDirectories.GetLength(0); i++)
{
DirectoryInfo MySubDirectory = MySubDirectories[i];
List<FileInfo> l = new List<FileInfo>();
CountFiles(MySubDirectory, l);
int totalFiles = l.Count;
object[] CurrentStatus = new object[5];
CurrentStatus[3] = i.ToString();
CurrentStatus[4] = totalFiles.ToString();
_FileProcessingWorker.ReportProgress(0, CurrentStatus);
string CurrentDirectory = "Current Directory: " + MySubDirectory.Name;
foreach (FileInfo MyFile in l)
{
CurrentStatus = new object[5];
if (_FileProcessingWorker.CancellationPending)
{
e.Cancel = true;
return;
}
if (MyFile.Extension.ToLower() == ".cs" || MyFile.Extension.ToLower() == ".vb")
{
string CurrentFile = "Current File: " + MyFile.Name;
string CurrentFileWithPath = MyFile.FullName;
CurrentStatus[0] = CurrentDirectory;
CurrentStatus[1] = CurrentFile;
_FileProcessingWorker.ReportProgress(0, CurrentStatus);
List<string> Result = SearchInFile(CurrentFileWithPath, "static class FileShellExtension");
if (Result != null && Result.Count > 0)
{
CurrentStatus[2] = Result;
_FileProcessingWorker.ReportProgress(0, CurrentStatus);
}
}
}
}
}
catch (Exception err)
{
return;
}
Progresschanged事件
private void _FileProcessingWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
if (typeof(object[]) == e.UserState.GetType())
{
object[] StatusMsg = (object[])e.UserState;
if (5 == StatusMsg.GetLength(0))
{
label2.Text = StatusMsg[4].ToString();
label4.Text = StatusMsg[3].ToString();
if (StatusMsg[0] != null && StatusMsg[1] != null)
{
lblCurrentDirectory.Text = StatusMsg[0].ToString();
lblStatus.Text = StatusMsg[1].ToString();
}
if (StatusMsg[2] != null)
{
if (StatusMsg[2].GetType() == typeof(List<string>))
{
List<string> l = (List<string>)StatusMsg[2];
for (int i = 0; i < l.Count; i++)
{
ListViewCostumControl.lvnf.Items.Add("Directory: " + lblCurrentDirectory.Text + "In File: " + lblStatus.Text + l[i]);
w.WriteLine("Directory: " + lblCurrentDirectory.Text + "In File: " + lblStatus.Text + l[i]);
}
}
}
}
}
}
CountFiles方法
private void CountFiles(DirectoryInfo di, List<FileInfo> l)
{
try
{
l.AddRange(di.EnumerateFiles());
}
catch
{
string fff = "";
}
try
{
IEnumerable<DirectoryInfo> subDirs = di.EnumerateDirectories();
if (subDirs.Count() > 0)
{
foreach (DirectoryInfo dir in subDirs)
CountFiles(dir, l);
}
}
catch
{
string yyy = "";
}
}
SearchInFile方法
private List<string> SearchInFile(string fileToSearch, string textToSearch)
{
List<string> l = new List<string>();
try
{
foreach (var line in File.ReadAllLines(fileToSearch))
{
if (line.Contains(textToSearch))
l.Add(line);
}
}
catch(Exception err)
{
string fff = err.ToString();
}
return l;
}
第一个问题是获取目录数量时：
private void btnProcess_Click(object sender, EventArgs e)
{
btnProcess.Enabled = false;
btnDirectory.Enabled = false;
btnCancel.Visible = true;
btnCancel.Enabled = true;
btnCancel.Text = "Cancel";
MyProgressBar.Visible = true;
_FileProcessingWorker = new BackgroundWorker();
_FileProcessingWorker.WorkerReportsProgress = true;
_FileProcessingWorker.WorkerSupportsCancellation = true;
_FileProcessingWorker.DoWork += new DoWorkEventHandler(_FileProcessingWorker_DoWork);
_FileProcessingWorker.ProgressChanged += new ProgressChangedEventHandler(_FileProcessingWorker_ProgressChanged);
_FileProcessingWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(_FileProcessingWorker_RunWorkerCompleted);
string BasePath = lblDirectoryName.Text;
DirectoryInfo MyDirectory = new DirectoryInfo(BasePath);
DirectoryInfo[] MySubDirectories = MyDirectory.GetDirectories();
int SubDirectoryCount = MySubDirectories.GetLength(0);
MyProgressBar.Minimum = 0;
MyProgressBar.Step = 1;
MyProgressBar.Maximum = SubDirectoryCount;
MyProgressBar.Value = MyProgressBar.Minimum;
_LastCounter = 0;
_FileProcessingWorker.RunWorkerAsync(MySubDirectories);
}
在点击按钮中，我获取子目录。 但是有两个问题。 在dowork事件中，我在这一行上设置了一个断点：
for (int i = 0; i < MySubDirectories.GetLength(0); i++)
我看到它包含409个目录。但是当我向dowork事件中的label4报告目录数量时
CurrentStatus[3] = i.ToString();
在progresschanged事件中
label4.Text = StatusMsg[3].ToString();
我最终在label4 408目录中看到了。在D :(在这种情况下，我正在我的D：\目录上工作）当我选择Windows资源管理器中的所有目录时，右键单击和属性我只看到405个目录。那么目录的真实数量是多少？我应该在label4中显示多少目录？
第二个问题是当我报告dowork事件中的文件数时：
CurrentStatus[4] = totalFiles.ToString();
并且在progresschange事件中显示在label2上：
label2.Text = StatusMsg[4].ToString();
问题是，totalFiles值一直在变化，一旦它变为2，那么它是768然后是它的66然后是8987但是我想要的是以某种方式实现总结时间值totalFiles所以在label2中我将第一次看到例如：2然后770然后（770 + 66）所以我将在label2 816 ....中看到总是看到目前为止所有值的总和。
最后一个问题是在这个循环的progresschanged事件中：
for (int i = 0; i < l.Count; i++)
{ ListViewCostumControl.lvnf.Items.Add("Directory: " + lblCurrentDirectory.Text + "In File: " + lblStatus.Text + l[i]);
w.WriteLine("Directory: " + lblCurrentDirectory.Text + "In File: " + lblStatus.Text + l[i]);
}
这可能是逻辑某种方式在这个时候在另一个背景工作者如backgroundworker2 dowork事件的程序中取出并制作这个循环？如果是这样怎么办？问题是当循环中有许多项要添加到listView时它会使程序挂起直到循环结束。
答案 0 :(得分：1)
每次执行
CurrentStatus[4] = totalFiles.ToString();
您正在将状态值重置为当前处理目录中的文件计数。这就是为什么数字一直在弹跳。相反，我建议：
int thisDirFiles;
thisDirFiles = l.Count;
totalFiles += thisDirFiles;
CurrentStatus[4] = totalFiles.ToString();
现在，当您报告进度时，CurrentStatus [4]将具有运行总计。
对于您的第二个问题，在您报告进度时，我认为您正在尝试做太多。操作ListView可能成本很高，并且您可能花费更多时间更新ListView而不是处理目录，因此您的计算机似乎冻结了。