C# 文件路径波浪线(~)转换为实际名称&Dos8.3路径规则转换

C# 读取文件或文件夹的时候，路径有时候会变成带有波浪线（~）的形式，这是DOS 8.3文件名规则，感兴趣的小伙伴可以搜搜看。

遇到这种情况，想要转换成实际路径，需要调用Win32 API，代码如下：

其中GetShortPathName方法，是将路径全名转换为DOS 8.3规则，GetLongPathName方法，是将DOS8.3规则的形式转换为全名称路径

调用方法之后，如果没有获取到自己期望的结果，可以再调用一下int errorCode = Marshal.GetLastWin32Error();来检查错误情况。错误代码对应值参考微软官方链接

如有疑问，欢迎评论区留言

　　 /// <summary>
    /// Dos8.3名称规则转换
    /// </summary>
    public class Dos8_3Helper
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="longPath"></param>
        /// <param name="shortPath"></param>
        /// <param name="shortPathLength"></param>
        /// <returns></returns>
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern int GetShortPathName(string longPath, StringBuilder shortPath, int shortPathLength);
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sourceFilePath"></param>
        /// <param name="pathResult"></param>
        public static bool AmanShortPathName(string sourceFilePath,out string pathResult)
        {
            StringBuilder shortPathBuffer = new StringBuilder(1000);
            int result = GetShortPathName(sourceFilePath, shortPathBuffer, shortPathBuffer.Capacity);
            if (result != 0)
            {
                pathResult = shortPathBuffer.ToString();
                return true;
            }
            else
            {
                pathResult = string.Empty;
                return false;
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="shortPath"></param>
        /// <param name="longPath"></param>
        /// <param name="longPathLength"></param>
        /// <returns></returns>
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern int GetLongPathName(string shortPath, StringBuilder longPath, int longPathLength);

        /// <summary>
        /// 
        /// </summary>
        /// <param name="sourceFilePath"></param>
        /// <param name="pathResult"></param>
        public static bool AmanLongPathName(string sourceFilePath,out string pathResult)
        {
            StringBuilder longPathBuffer = new StringBuilder(1000);
            int result = GetLongPathName(sourceFilePath, longPathBuffer, longPathBuffer.Capacity);
            if (result != 0)
            {
                pathResult = longPathBuffer.ToString();
                return true;
            }
            else
            {
                pathResult = string.Empty;
                return false;
            }
        }
    }