C# 文件复制进度条未更新。文件拷贝工作正常

我正在写一份申请书来复制一个文件。我有文件复制没有任何问题，但由于某种原因，进度条没有更新。我正在使用后台工作程序。代码如下：

private void bgWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            // Gets the size of the file in bytes.
            Int64 iSize = strInputFile.Length;

            // Keeps track of the total bytes downloaded so we can update the progress bar.
            Int64 iRunningByteTotal = 0;
                // Open the input file for reading.
            using (FileStream InputFile = new FileStream(strInputFile, FileMode.Open, FileAccess.Read, FileShare.None))
            {
                // Using the FileStream object, we can write the output file.
                using (FileStream OutputFile = new FileStream(strOutputFile, FileMode.Create, FileAccess.Write, FileShare.None))
                {
                    // Loop the stream and get the file into the byte buffer.
                    int iByteSize = 0;
                    byte[] byteBuffer = new byte[iSize];
                    while ((iByteSize = InputFile.Read(byteBuffer, 0, byteBuffer.Length)) > 0)
                    {
                        // Write the bytes to the file system at the file path specified.
                        OutputFile.Write(byteBuffer, 0, iByteSize);
                        iRunningByteTotal += iByteSize;

                        // Calculate the progress out of a base "100."
                        double dIndex = (double)(iRunningByteTotal);
                        double dTotal = (double)byteBuffer.Length;
                        double dProgressPercentage = (dIndex / dTotal);
                        int iProgressPercentage = (int)(dProgressPercentage * 100);
                        // Update the progress bar.
                       bgWorker.WorkerReportsProgress = true;
                        bgWorker.ReportProgress(iProgressPercentage);
                    }
                    // Close the output file.
                    OutputFile.Close();
                }
                // Close the input file.
                InputFile.Close();
            }
        }

        private void bgWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            // We will increase the progress bar when work progress is reported.
            pbCopyProgress.Value = e.ProgressPercentage;
            pbCopyProgress.Text = (e.ProgressPercentage.ToString() + " %");
        }

        private void bgWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            // Disable the Copy button once the file has been copied.
            MessageBox.Show("The file: "+strOutputFile+" has been copied");
            btnCopy.Enabled = false;
        }

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我发现我需要初始化我的后台工作者事件处理程序，以修复我遇到的问题。我只需要在form load事件中添加以下三行：

 bgWorker.DoWork += bgWorker_DoWork;
 bgWorker.RunWorkerCompleted += bgWorker_RunWorkerCompleted;
 bgWorker.ProgressChanged += bgWorker_ProgressChanged;

---

此行

bgWorker.WorkerReportsProgress=true

应该在

bgWorker\u-DoWork

方法之外，可能在窗体的构造函数中（通常是以“可视化”方式而不是以编程方式执行此操作）。请尝试替换

bgWorker.WorkerReportsProgress=true在您的表单中，我们已经修复了bgWorker.WorkerReportsProgress=true；是否添加了
bgWorker.RunWorkerAsync（）方法？？如何从字符串文件名获取文件大小？（Int64 iSize=strInputFile.Length）作为将来的参考，您可以使用Visual Studio表单编辑器创建Backgroundworker对象并自动连接所有事件处理程序-Backgroundworker位于表单工具箱中，与任何其他表单控件（按钮、文本框等）一样工作，除了它在运行时在窗体上实际上不可见之外。