返回两次文件比较后添加或删除的记录

时间:2013-08-27 19:08:48

标签: c# winforms

我正在比较两个文件,其中一个文件可能添加或删除了项目。我正在检查两个文件之间是否存在差异,如果是,那么无论是添加还是删除了记录,这些区别是什么。我想返回那些记录(添加或删除)

我用它告诉我文件是否删除或添加了项目但是返回已添加或删除的项目。任何有关我缺少的帮助将不胜感激。

   foreach (ExcelRow rowA in fileA.excelRows)
    {
        if (!fileB.ContainsHash(rowA.rowHash))
        {
            MessageBox.Show("Files are NOT the same. Data was REMOVED.\n" + rowA.ToString());
        }

    }

    foreach (ExcelRow rowB in fileB.excelRows)
    {
         if (!fileA.ContainsHash(rowB.rowHash))
         {
              MessageBox.Show("Row added" + rowB.ToString());
         }
    }

public List<ExcelRow> excelRows = new List<ExcelRow>();

        public bool ContainsHash(byte[] hashToLook)
        {
            bool found;
            found = false;
            foreach (ExcelRow eRow in excelRows)
            {
                found = EqualHash(eRow.rowHash, hashToLook);

                if (found)
                {
                    break;
                }
            }

            return found;
        }

        public static bool EqualHash(byte[] hashA, byte[] hashB)
        {
            bool bEqual ;
            int i ;

            bEqual  = false;
            if (hashA.Length == hashB.Length)
            {

                i = 0;
                while ((i < hashA.Length) && (hashA[i] == hashB[i]))
                {
                    i++ ;
                }
                if (i == hashA.Length)
                {
                    bEqual = true;
                }
            }
            return bEqual ;
        }

阅读文件:

public ExcelInfo ReadExcel(OpenFileDialog openFileDialog)
        {
            var _excelFile = new ExcelQueryFactory(openFileDialog.FileName);
            var _info = from c in _excelFile.WorksheetNoHeader() select c;

            ExcelRow excelRow;
            ExcelInfo resp;

            resp = new ExcelInfo();

            foreach (var item in _info)
            {
                excelRow = new ExcelRow();
                excelRow.lstCells.Add(item.ElementAt(0));
                excelRow.lstCells.Add(item.ElementAt(1));
                excelRow.lstCells.Add(item.ElementAt(2));
                excelRow.lstCells.Add(item.ElementAt(3));
                excelRow.lstCells.Add(item.ElementAt(4));
                excelRow.lstCells.Add(item.ElementAt(5));
                excelRow.lstCells.Add(item.ElementAt(6));
                excelRow.lstCells.Add(item.ElementAt(7));
                excelRow.lstCells.Add(item.ElementAt(8));
                excelRow.lstCells.Add(item.ElementAt(9));
                excelRow.lstCells.Add(item.ElementAt(10));
                excelRow.lstCells.Add(item.ElementAt(11));
                excelRow.lstCells.Add(item.ElementAt(12));

                excelRow.CalculateHash();
                resp.excelRows.Add(excelRow);
            }
            return resp;
        }

计算哈希:

public void CalculateHash()
        {
            byte[] rowBytes;
            byte[] cellBytes;
            int pos;
            int numRowBytes;

            numRowBytes = 0;
            foreach (string cellText in lstCells)
            {
                numRowBytes += NumBytes(cellText);
            }

            //Allocate space to calculate the HASH of a single row

            rowBytes = new byte[numRowBytes];
            pos = 0;

            //Concatenate the cellText of each row into a single byte array
            foreach (string cellText in lstCells)
            {
                cellBytes = GetBytes(cellText);
                System.Buffer.BlockCopy(cellBytes, 0, rowBytes, pos, cellBytes.Length);
                pos = cellBytes.Length;
            }
            rowHash = new MD5CryptoServiceProvider().ComputeHash(rowBytes);
        }

在调试时:

if (!fileB.ContainsHash(rowA.rowHash))

fileB包含三行,fileA包含4行。

fileB = 3, rowA = fileA中的第一行和(.rowHash)是byte [16]

因为我继续使用ContainHash方法,byte [] hashToLook = 16 - 这不应该是rowA吗?

excelRows = 3(fileB)

然后 EqualHash(eRow.rowHash,hashToLook)是(fileA中的第一行,byte [16])

我在rowA错误传递了吗?

2 个答案:

答案 0 :(得分:1)

你几乎就在那里,只需添加两个列表来跟踪A中但不在B中的项目以及B中但不在A中的项目:

var notInA = new List<ExcelRow>();
var notInB = new List<ExcelRow>();

现在在您的代码中,将它们添加到适当的列表中:

foreach (ExcelRow rowA in fileA.excelRows)
{
    if (!fileB.ContainsHash(rowA.rowHash))
    {
        MessageBox.Show("Files are NOT the same. Data was REMOVED.\n" + rowA.ToString());
        notInB.Add(rowA);
    }

}

foreach (ExcelRow rowB in fileB.excelRows)
{
     if (!fileA.ContainsHash(rowB.rowHash))
     {
          MessageBox.Show("Row added" + rowB.ToString());
          notInA.Add(rowB);
     }
}

答案 1 :(得分:0)

只需将hashA[i] != hashB[i]更改为hashA[i] == hashB[i]:)