如何在c#中使用文件流来复制文件

Question

我想使用fileststream将文件从一个文件夹复制到另一个文件夹。如何做到这一点。当我试图使用文件。复制我得到这个文件是由另一个进程使用，为了避免这种情况，我想使用c#使用文件流。谁能提供一个把文件从一个文件夹复制到另一个文件夹的例子?

Answer 1

复制我使用的下面代码:-

 public static void Copy(string inputFilePath, string outputFilePath)
    {
        int bufferSize = 1024 * 1024;
        using (FileStream fileStream = new FileStream(outputFilePath, FileMode.OpenOrCreate, FileAccess.Write,FileShare.ReadWrite))
        //using (FileStream fs = File.Open(<file-path>, FileMode.Open, FileAccess.Read, FileShare.Read))
        {
            FileStream fs = new FileStream(inputFilePath, FileMode.Open, FileAccess.ReadWrite);
            fileStream.SetLength(fs.Length);
            int bytesRead = -1;
            byte[] bytes = new byte[bufferSize];
            while ((bytesRead = fs.Read(bytes, 0, bufferSize)) > 0)
            {
                fileStream.Write(bytes, 0, bytesRead);
            }
        }
    }

Answer 2

您可以使用Stream。CopyTo方法复制文件，如下所示:

public static string CopyFileStream(string outputDirectory, string inputFilePath)
{
    FileInfo inputFile = new FileInfo(inputFilePath);
    using (FileStream originalFileStream = inputFile.OpenRead())
    {
        var fileName = Path.GetFileName(inputFile.FullName);
        var outputFileName = Path.Combine(outputDirectory, fileName);
        using (FileStream outputFileStream = File.Create(outputFileName))
        {
            originalFileStream.CopyTo(outputFileStream);
        }
        return outputFileName;
    }
}

Answer 3

    string fileName = "Mytest.txt";
    string sourcePath = @"C:MyTestPath";
    string targetPath =  @"C:MyTestTarget";
    string sourceFile = System.IO.Path.Combine(sourcePath, fileName);
    string destFile = System.IO.Path.Combine(targetPath, fileName);
    {
        System.IO.Directory.CreateDirectory(targetPath);
    }
    // To copy a file to another location and 
    // overwrite the destination file if it already exists.
    System.IO.File.Copy(sourceFile, destFile, true);