Hi Chihwei Tian,
下面的例子是使用windows 的 api：SHFileOperation， 它会直接调用到windows内核，会省去中间CLR这一层。
string errorme="";
FileOperateProxy.DeleteFile(@"D:\screenshot222.png", true, false, false, ref errorme);
MessageBox.Show(errorme);
public class FileOperateProxy
{
private struct SHFILEOPSTRUCT
{
public IntPtr hwnd;
public wFunc wFunc;
public string pFrom;
public string pTo;
public FILEOP_FLAGS fFlags;
public bool fAnyOperationsAborted;
public IntPtr hNameMappings;
public string lpszProgressTitle;
}
private enum wFunc
{
FO_MOVE = 0x0001, //移动文件
FO_COPY = 0x0002, //复制文件
FO_DELETE = 0x0003, //删除文件，只是用pFrom
FO_RENAME = 0x0004 //文件重命名
}
private enum FILEOP_FLAGS
{
FOF_MULTIDESTFILES = 0x0001,
FOF_CONFIRMMOUSE = 0x0002,
FOF_SILENT = 0x0044,
FOF_RENAMEONCOLLISION = 0x0008,
FOF_NOCONFIRMATION = 0x10,
FOF_WANTMAPPINGHANDLE = 0x0020,
FOF_ALLOWUNDO = 0x40,
FOF_FILESONLY = 0x0080,
FOF_SIMPLEPROGRESS = 0x0100,
FOF_NOCONFIRMMKDIR = 0x0200,
FOF_NOERRORUI = 0x0400,
FOF_NOCOPYSECURITYATTRIBS = 0x0800,
FOF_NORECURSION = 0x1000
}
[DllImport("shell32.dll")]
private static extern int SHFileOperation(ref SHFILEOPSTRUCT lpFileOp);
/// <summary>
/// 删除单个文件。
/// </summary>
/// <param name="fileName">删除的文件名</param>
/// <param name="toRecycle">指示是将文件放入回收站还是永久删除，true-放入回收站，false-永久删除</param>
/// <param name="showDialog">指示是否显示确认对话框，true-显示确认删除对话框，false-不显示确认删除对话框</param>
/// <param name="showProgress">指示是否显示进度对话框，true-显示，false-不显示。该参数当指定永久删除文件时有效</param>
/// <param name="errorMsg">反馈错误消息的字符串</param>
/// <returns>操作执行结果标识，删除文件成功返回0，否则，返回错误代码</returns>
public static int DeleteFile(string fileName, bool toRecycle, bool showDialog, bool showProgress, ref string errorMsg)
{
try
{
string fName = GetFullName(fileName);
return ToDelete(fName, toRecycle, showDialog, showProgress, ref errorMsg);
}
catch (Exception ex)
{
errorMsg = ex.Message;
return -200;
}
}
private static int ToDelete(string fileName, bool toRecycle, bool showDialog, bool showProgress, ref string errorMsg)
{
SHFILEOPSTRUCT lpFileOp = new SHFILEOPSTRUCT();
lpFileOp.wFunc = wFunc.FO_DELETE;
lpFileOp.pFrom = fileName + "\0"; //将文件名以结尾字符"\0"结束
lpFileOp.fFlags = FILEOP_FLAGS.FOF_NOERRORUI;
if (toRecycle)
lpFileOp.fFlags |= FILEOP_FLAGS.FOF_ALLOWUNDO; //设定删除到回收站
if (!showDialog)
lpFileOp.fFlags |= FILEOP_FLAGS.FOF_NOCONFIRMATION; //设定不显示提示对话框
if (!showProgress)
lpFileOp.fFlags |= FILEOP_FLAGS.FOF_SILENT; //设定不显示进度对话框
lpFileOp.fAnyOperationsAborted = true;
int n = SHFileOperation(ref lpFileOp);
if (n == 0)
return 0;
string tmp = GetErrorString(n);
//.av 文件正常删除了但也提示 402 错误，不知道为什么。屏蔽之。
if ((fileName.ToLower().EndsWith(".av") && n.ToString("X") == "402"))
return 0;
errorMsg = string.Format("{0}({1})", tmp, fileName);
return n;
}
/// 获取一个文件的全名
/// </summary>
/// <param name="fileName">文件名</param>
/// <returns>返回生成文件的完整路径名</returns>
private static string GetFullName(string fileName)
{
FileInfo fi = new FileInfo(fileName);
return fi.FullName;
}
/// <summary>
/// 解释错误代码
/// </summary>
/// <param name="n">代码号</param>
/// <returns>返回关于错误代码的文字描述</returns>
private static string GetErrorString(int n)
{
if (n == 0) return "Delete successful";
switch (n)
{
case 2:
return "系统找不到指定的文件。";
case 7:
return "存储控制块被销毁。您是否选择的“取消”操作？";
case 113:
return "文件已存在！";
case 115:
return "重命名文件操作,原始文件和目标文件必须具有相同的路径名。不能使用相对路径。";
case 117:
return "I/O控制错误";
case 123:
return "指定了重复的文件名";
case 116:
return "The source is a root directory, which cannot be moved or renamed.";
case 118:
return "Security settings denied access to the source.";
case 124:
return "The path in the source or destination or both was invalid.";
case 65536:
return "An unspecified error occurred on the destination.";
case 1026:
return "在试图移动或拷贝一个不存在的文件.";
case 1223:
return "操作被取消！";
default:
return "未识别的错误代码：" + n;
}
}
}
Best Regards
Yong Lu
MSDN Community Support
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