C#轻松实现文件读取进度监控功能

public interface IFile
{
    byte[] ReadFile_WithFileStream(string fileName, FileMode fileMode = FileMode.Open, FileAccess fileAccess = FileAccess.Read);
    float GetStreamReadProgress();
}

public class SyncFile : IFile
{
    public float ReadProgress { get; set; }

    public byte[] ReadFile_WithFileStream(string fileName, FileMode fileMode = FileMode.Open, FileAccess fileAccess = FileAccess.Read)
    {
        byte[] dataArray = default(byte[]);
        using (FileStream fs = new FileStream(fileName, fileMode, fileAccess))
        {
            if (fs.CanRead)
            {
                long len = fs.Length;
                dataArray = new byte[len];
                for (int i = 0; i < len; i++)
                {
                    dataArray[i] = (byte)(fs.ReadByte());
                    ReadProgress = i * 1.0f / len; // 计算当前读取进度
                }
            }
        }
        return dataArray;
    }

    public float GetStreamReadProgress()
    {
        return ReadProgress;
    }
}

IFile fileOperate = new SyncFile();

// 启动文件读取任务
Task.Run(() =>
{
    fileOperate.ReadFile_WithFileStream(@"D:\cvextern.dll");
});

// 实时更新进度
Task.Run(() =>
{
    int count = 0;
    while (true)
    {
        float progress = fileOperate.GetStreamReadProgress();
        Console.WriteLine($"{count}: {progress}");
        count++;

        string str = $"{progress:P10}";

        if (this.IsHandleCreated)
        {
            textBox1.Invoke(new Action(() => { textBox1.Text = str; }));

            progressBar1.Invoke(new Action(() =>
            {
                int value = (int)(progress * 100);
                progressBar1.Value = value;
            }));
        }

        Thread.Sleep(50); // 每隔50毫秒更新一次
    }
});