Question

我在将文件从列表框移动到新创建的文件夹时遇到问题。我得到：该文件已存在时无法创建文件。

public void CreateFolders()
    {            
        //create folders
        string folder1 = pattern.Substring(0, 2);
        string folder2 = pattern.Substring(3, 2);
        string folder3 = pattern.Substring(6, 2);
        Directory.CreateDirectory("c:\\destinationfolder" + "\\" + folder1);
        Directory.CreateDirectory("c:\\destinationfolder" + "\\" + folder1 + "\\" + folder2);
        Directory.CreateDirectory("c:\\destinationfolder" + "\\" + folder1 + "\\" + folder2 + "\\" + folder3);
        var destinationDirectoryFinal = Directory.CreateDirectory("c:\\destinationfolder" + "\\" + folder1 + "\\" + folder2 + "\\" + folder3);
        destinationDirectory = destinationDirectoryFinal.FullName.ToString();
    }

    public void MoveFiles()
    {
        try
        {
            //Move files from listbox to newly created folders
            foreach (string files in listBox1.Items)
            {
                File.Move(files, destinationDirectory);
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error: " + ex);
        }

    }

Answer 1

这里遇到的问题是，您试图将文件移动到已经包含该名称文件的目录中。

您可以选择以下两个选项：

选项一

在尝试Move之前检查文件是否存在

foreach (var file in listBox1.Items)
{
    // Only move the file if it doesn't already exist
    if (!File.Exists(Path.Combine(destinationDirectory, Path.GetFileName(file))))
    {
        File.Move(file, destinationDirectory);
    }
}

选择二

始终覆盖文件（如果存在）。我们可以分两步进行操作-首先通过将“ overwrite”参数设置为File.Copy来调用true，然后通过调用File.Delete来删除原始位置的文件：

foreach (var file in listBox1.Items)
{
    // If the destination file already exists, overwrite it. Then delete the original
    File.Copy(file, Path.Combine(destinationDirectory, Path.GetFileName(file)), true);
    File.Delete(file);
}

注意： 防止错误（无论哪种情况）的另一件事是，在尝试尝试任何操作之前，请确保源文件存在，并且源目录与目标目录不同：

foreach (var file in listBox1.Items)
{
    // Ensure that the file exists and that the source 
    // and destination directories are not the same
    if (!(File.Exists(file)) ||
        Path.GetDirectoryName(file).Equals(
            destinationDirectory, StringComparison.OrdinalIgnoreCase))
    {
        continue; // Continue to the next loop iteration without doing anything
    }

    // Rest of loop code here...
}

无法将文件从列表框移动到新创建的文件夹

1 个答案:

选项一

选择二