c#中如何解析相对路径

Question

我有一个结合路径的函数。例子

我的应用程序位于 D:\toto\titi\tata\myapplication.exe

我创建了一个 windows 窗体应用程序 (c#)，它根据我的应用程序的路径 ( D:\toto\titi\tata\myapplication.exe)解决相对路径。

我想要这个：

1）解决的路径是 test.txt => D:\toto\titi\tata\test.txt

2）解决的路径是 .\..\..\test\test.txt => D:\toto\test\test.txt

3）解决的路径是 .\..\test\test.txt => D:\toto\titi\test\test.txt

4）解决的路径是 .\..\..\..\test\test.txt => D:\test\test.txt

5）解决的路径是 .\..\..\..\..\test\test.txt => The path doesn't exist

6）解决的路径是 \\server\share\folder\test => get the corresponding path in the server.

我用这个方法

private void btnSearchFile_Click(object sender, EventArgs e)
{
    // Open an existing file, or create a new one.
    FileInfo fi = new FileInfo(@"D:\toto\titi\tata\myapplication.exe");

    // Determine the full path of the file just created or opening.
    string fpath = fi.DirectoryName;

    // First case.
    string relPath1 = txtBoxSearchFile.Text;
    FileInfo fiCase1 = new FileInfo(Path.Combine(fi.DirectoryName, relPath1.TrimStart('\\')));

    //Full path
    string fullpathCase1 = fiCase1.FullName;

    txtBoxFoundFile.Text = fullpathCase1;
}

但我没有解决第 1) 点；第 5) 点和第 6) 点

你能帮助我吗

Answer 1

您可以使用Environment.CurrentDirectory.

要将相对路径转换为绝对路径，您可以执行以下操作：

var currentDir = @"D:\toto\titi\tata\";
var case1 = Path.GetFullPath(Path.Combine(currentDir, @"test.txt"));
var case2 = Path.GetFullPath(Path.Combine(currentDir, @".\..\..\test\test.txt"));
var case3 = Path.GetFullPath(Path.Combine(currentDir, @".\..\test\test.txt"));
var case4 = Path.GetFullPath(Path.Combine(currentDir, @".\..\..\..\test\test.txt"));
var case5 = Path.GetFullPath(Path.Combine(currentDir, @".\..\..\..\..\test\test.txt"));
var case6 = Path.GetFullPath(Path.Combine(currentDir, @"\\server\share\folder\test".TrimStart('\\')));

并检查指定文件的存在：

if (File.Exists(fileName))
{
  // ...
}

因此，总而言之，您可以将您的方法重写为这样的方法（如果我正确理解您的问题）：

private void btnSearchFile_Click(object sender, EventArgs e)
{
  var currentDir = Environment.CurrentDirectory;
  var relPath1 = txtBoxSearchFile.Text.TrimStart('\\');
  var newPath = Path.GetFullPath(Path.Combine(currentDir, relPath1));
  if (File.Exists(newPath))
    txtBoxFoundFile.Text = newPath;
  else
    txtBoxFoundFile.Text = @"File not found";
}