如何检查用户输入的路径是否有效？

Question

我在忙着寻找答案时找到了这段代码！

private void btnOpenFile_Click(object sender, EventArgs e)
{
    OpenFileDialog saveFileDialogBrowse = new OpenFileDialog();
    saveFileDialogBrowse.Filter = "Pcap file|*.pcap";
    saveFileDialogBrowse.Title = "Save an pcap File";
    saveFileDialogBrowse.ShowDialog();
    var pcapFile = saveFileDialogBrowse.FileName; //do whatever you like with the selected filename

    if (pcapFile != "")
    {
        FileInfo fileInfo = new FileInfo(pcapFile);
        txtFilePath.Text = fileInfo.FullName;
    }
}

Answer 1

没有简单的方法。

您可以使用File.Exists检查路径上是否存在文件，但在执行下一行之前仍可能发生更改。您最好的选择是将File.Exists与try-catch结合使用以捕获任何可能的异常。

private void btnOpenFile_Click(object sender, EventArgs e)
{
    OpenFileDialog saveFileDialogBrowse = new OpenFileDialog();
    saveFileDialogBrowse.Filter = "Pcap file|*.pcap";
    saveFileDialogBrowse.Title = "Save an pcap File";
    saveFileDialogBrowse.ShowDialog();
    var pcapFile = saveFileDialogBrowse.FileName; //do whatever you like with the selected filename
    try
    {
        if (File.Exists(pcapFile))
        {
            FileInfo fileInfo = new FileInfo(pcapFile);
            txtFilePath.Text = fileInfo.FullName;
        }
    }
    catch (FileNotFoundException fileNotFoundException)
    {
        //Log and handle
    }
    catch (Exception ex)
    {
        //log and handle
    }
}

Answer 2

您可以使用File.Exists方法：

string fullPath = @"c:\temp\test.txt";
bool fileExists = File.Exists(fullPath);

Answer 3

您可以使用File.Exists方法，该方法记录在案here。