当开发人员可以更改代码以包含所需的代码片段时，所有建议的答案都是有效的，但如果您希望在不更改任何代码的情况下做到这一点，则可以使用Process Explorer。

它将列出系统中所有正在执行的dll，您可能需要确定正在运行的应用程序的进程id，但这通常并不太难。

我已经写了一个完整的描述如何在II - http://nodogmablog.bryanhogan.net/2016/09/locating-and-checking-an-executing-dll-on-a-running-web-server/中为一个dll做到这一点

这应该可以工作，除非程序集是影子复制的:

string path = System.Reflection.Assembly.GetExecutingAssembly().Location

与John的答案相同，但扩展方法略少啰嗦。

public static string GetDirectoryPath(this Assembly assembly)
{
    string filePath = new Uri(assembly.CodeBase).LocalPath;
    return Path.GetDirectoryName(filePath);            
}

现在你可以做:

var localDir = Assembly.GetExecutingAssembly().GetDirectoryPath();

或者如果你喜欢:

var localDir = typeof(DaoTests).Assembly.GetDirectoryPath();

string path = Path.GetDirectoryName(typeof(DaoTests).Module.FullyQualifiedName);

var assembly = System.Reflection.Assembly.GetExecutingAssembly();
var assemblyPath = assembly.GetFiles()[0].Name;
var assemblyDir = System.IO.Path.GetDirectoryName(assemblyPath);

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。