在windows窗体应用程序中，你可以简单地使用应用程序。StartupPath

但对于dll和控制台应用程序，代码更难记住…

string slash = Path.DirectorySeparatorChar.ToString();
string root = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);

root += slash;
string settingsIni = root + "settings.ini"

其实很简单:

var dir = AppDomain.CurrentDomain.BaseDirectory;

如果路径包含“#”符号，则会得到不正确的目录。 所以我使用了John bly答案的一个修改，那就是组合UriBuilder。Path和UriBuilder。片段:

public static string AssemblyDirectory
{
    get
    {
        string codeBase = Assembly.GetExecutingAssembly().CodeBase;
        UriBuilder uri = new UriBuilder(codeBase);
        //modification of the John Sibly answer    
        string path = Uri.UnescapeDataString(uri.Path.Replace("/", "\\") + 
          uri.Fragment.Replace("/", "\\"));
        return Path.GetDirectoryName(path);
     }
}

我一直在用汇编。用CodeBase代替Location:

Assembly a;
a = Assembly.GetAssembly(typeof(DaoTests));
string s = a.CodeBase.ToUpper(); // file:///c:/path/name.dll
Assert.AreEqual(true, s.StartsWith("FILE://"), "CodeBase is " + s);
s = s.Substring(7, s.LastIndexOf('/') - 7); // 7 = "file://"
while (s.StartsWith("/")) {
    s = s.Substring(1, s.Length - 1);
}
s = s.Replace("/", "\\");

它一直在工作，但我不再确定它是100%正确的。http://blogs.msdn.com/suzcook/archive/2003/06/26/assembly-codebase-vs-assembly-location.aspx的网页上写着:

"The CodeBase is a URL to the place where the file was found, while the Location is the path where it was actually loaded. For example, if the assembly was downloaded from the internet, its CodeBase may start with "http://", but its Location may start with "C:\". If the file was shadow-copied, the Location would be the path to the copy of the file in the shadow copy dir. It’s also good to know that the CodeBase is not guaranteed to be set for assemblies in the GAC. Location will always be set for assemblies loaded from disk, however."

您可能希望使用CodeBase而不是Location。

这么多年来，没有人真正提到过这一点。这是我从很棒的ApprovalTests项目中学到的技巧。诀窍在于使用程序集中的调试信息来查找原始目录。

在发布模式下，在启用优化的情况下，或者在与编译它的机器不同的机器上，这将不起作用。

但这将为您提供相对于您调用它的源代码文件的位置的路径

public static class PathUtilities
{
    public static string GetAdjacentFile(string relativePath)
    {
        return GetDirectoryForCaller(1) + relativePath;
    }
    public static string GetDirectoryForCaller()
    {
        return GetDirectoryForCaller(1);
    }


    public static string GetDirectoryForCaller(int callerStackDepth)
    {
        var stackFrame = new StackTrace(true).GetFrame(callerStackDepth + 1);
        return GetDirectoryForStackFrame(stackFrame);
    }

    public static string GetDirectoryForStackFrame(StackFrame stackFrame)
    {
        return new FileInfo(stackFrame.GetFileName()).Directory.FullName + Path.DirectorySeparatorChar;
    }
}

据我所知，大多数其他答案都有一些问题。

对于基于磁盘的(而不是基于web的)非gaced程序集，正确的方法是使用当前正在执行的程序集的CodeBase属性。

返回一个URL (file://)。不需要处理字符串操作或UnescapeDataString，可以通过利用Uri的LocalPath属性进行转换。

var codeBaseUrl = Assembly.GetExecutingAssembly().CodeBase;
var filePathToCodeBase = new Uri(codeBaseUrl).LocalPath;
var directoryPath = Path.GetDirectoryName(filePathToCodeBase);