c# 刪除程式佔用的檔案，清理刪除檔案，徹底刪除檔案，解除檔案佔用

檔案開啟時，以共享讀寫模式開啟

 FileStream inputStream = new FileStream(name, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
 p.BackgroundImage = new Bitmap(inputStream);
 inputStream.Dispose();

刪除檔案

public void WipeFile(string filename, int timesToWrite)
        {
            try
            {
                if (File.Exists(filename))
                {
                    //設定檔案的屬性為正常，這是為了防止檔案是隻讀
                    File.SetAttributes(filename, FileAttributes.Normal);
                    //計算扇區數目
                    double sectors = Math.Ceiling(new FileInfo(filename).Length / 512.0);
                    // 建立一個同樣大小的虛擬快取
                    byte[] dummyBuffer = new byte[512];
                    // 建立一個加密隨機數目生成器
                    RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
                    // 開啟這個檔案的FileStream
                    FileStream inputStream = new FileStream(filename, FileMode.Open, FileAccess.Write, FileShare.ReadWrite);
                    for (int currentPass = 0; currentPass < timesToWrite; currentPass++)
                    {
                        // 檔案流位置
                        inputStream.Position = 0;
                        //迴圈所有的扇區
                        for (int sectorsWritten = 0; sectorsWritten < sectors; sectorsWritten++)
                        {
                            //把垃圾資料填充到流中
                            rng.GetBytes(dummyBuffer);
                            // 寫入檔案流中
                            inputStream.Write(dummyBuffer, 0, dummyBuffer.Length);
                        }
                    }
                    // 清空檔案
                    inputStream.SetLength(0);
                    // 關閉檔案流
                    inputStream.Close();
                    // 清空原始日期需要
                    DateTime dt = new DateTime(2037, 1, 1, 0, 0, 0);
                    File.SetCreationTime(filename, dt);
                    File.SetLastAccessTime(filename, dt);
                    File.SetLastWriteTime(filename, dt);
                    // 刪除檔案
                    File.Delete(filename);
                }
            }
            catch (Exception)
            {
            }
        }