这样如何……

string ThisdllDirectory = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);

然后砍掉你不需要的部分

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);

我发现我的解足够检索位置。

var executingAssembly = new FileInfo((Assembly.GetExecutingAssembly().Location)).Directory.FullName;

ASP。网络，不管用。我在为什么AppDomain.CurrentDomain.BaseDirectory不包含asp.net应用程序中的“bin”中找到了一个更好的解决方案。它适用于Win Application和ASP。Net Web应用程序。

public string ApplicationPath
    {
        get
        {
            if (String.IsNullOrEmpty(AppDomain.CurrentDomain.RelativeSearchPath))
            {
                return AppDomain.CurrentDomain.BaseDirectory; //exe folder for WinForms, Consoles, Windows Services
            }
            else
            {
                return AppDomain.CurrentDomain.RelativeSearchPath; //bin folder for Web Apps 
            }
        }
    }

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。

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