使用TPL读取二进制文件

Question

我想用任务并行库读取二进制文件。但是我得到了这个错误

"The process cannot access the file 'D:\Binary.bin' because it is 
 being used by another process." 

我的代码段位于：

internal class Program
{
    private static void Main()
    {
       new ReaderWriterBinaryFile().ReadWriteFile();
    }
}

public class ReaderWriterBinaryFile
{
    public void ReadWriteFile()
    {
      //  WriteBinaryFile();

        Task.Factory.StartNew(() =>
                                  {
                                      var fs1 = new FileStream(@"D:\Binary.bin", FileMode.Open);
                                      var br = new BinaryReader(fs1);
                                      ReadBinaryFile(fs1, br, 1);
                                  });

        Task.Factory.StartNew(() =>
        {
            var fs1 = new FileStream(@"D:\Binary.bin", FileMode.Open);
            var br = new BinaryReader(fs1);
            ReadBinaryFile(fs1, br, 2);
        });



        Console.ReadKey();
    }

    private void WriteBinaryFile()
    {
        var fs = new FileStream(@"D:\Binary.bin", FileMode.Create);
        var bw = new BinaryWriter(fs);

        WriteBinaryFile(fs, bw);
    }

    private void ReadBinaryFile(FileStream fs, BinaryReader br, int taskNo)
    {

        var readBytes = br.ReadBytes(4000000);

        for (int i = 0; i < 1000000; i += 4)
        {
            var intValue = BitConverter.ToSingle(readBytes, i);
            Console.WriteLine(taskNo+"  ----       "+intValue);
        }


        fs.Close();
        br.Close();
    }

    private void WriteBinaryFile(FileStream fs, BinaryWriter bw)
    {
        for (int i = 22; i < 100000000; i++)
        {
            var age = Convert.ToSingle(i);
            bw.Write(age);   
        }

        fs.Close();
        bw.Close();

        Console.WriteLine("-------write end....");
    }`

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