2 Excelテーブルの列の値を比較し、C＃でデータテーブルを使用して類似を得る

Question

2つの選択された列をコンボボックスから比較して類似点を取得し、c＃のdatatableを使用して別のExcelシートにエクスポートします。

Answer 1

#region Properties 
    public string Directory { get; set; } 
    public string FirstFile { get; set; } 
    public string FirstFileSheetName { get; set; } 
    public string SecondFile { get; set; } 
    public string SecondFileSheetName { get; set; } 
    public DataTable ReturnDataSet { get; set; } 
    public bool Excel2007 { get; set; } 
    public bool UseHeader { get; set; } 
#endregion 

#region Constructor 
    public ExcelHandler() { } 

    public ExcelHandler(string Dir, string File1, string File1SheetName, string File2, string File2SheetName) 
    { 
     this.Directory = Dir; 
     this.FirstFile = File1; 
     this.SecondFile = File2; 
     this.FirstFileSheetName = File1SheetName; 
     this.SecondFileSheetName = File2SheetName; 
    } 
#endregion 

    #region Match Files 
    public DataTable CheckExcelFiles() 
    { 
     DataTable dtRet = new DataTable(); 
     //Read the first excel 
     try 
     { 
      //Read the excel 
      DataTable dt1 = GetDataTableFromExcel(this.Directory, this.FirstFile, this.FirstFileSheetName); 
      DataTable dt2 = GetDataTableFromExcel(this.Directory, this.SecondFile, this.SecondFileSheetName); 

      //Compare two 
      dtRet = getDifferentRecords(dt1, dt2); 
     } 
     catch (Exception ex) { } 
     return dtRet; 
    } 

    //Overload method to write to csv 
    public void CheckExcelFiles(string strFilePath) 
    { 
     DataTable dtRet = new DataTable(); 
     //Read the first excel 
     try 
     { 
      //Read the excel 
      DataTable dt1 = GetDataTableFromExcel(this.Directory, this.FirstFile, this.FirstFileSheetName); 
      DataTable dt2 = GetDataTableFromExcel(this.Directory, this.SecondFile, this.SecondFileSheetName); 

      //Compare two 
      dtRet = getDifferentRecords(dt1, dt2); 
      ExportDataTableToExcel(dtRet, strFilePath); 
     } 
     catch (Exception ex) { } 

    } 

    //Get Datatable reading Excel 
    private DataTable GetDataTableFromExcel(string strDir, string strFileName, string strSheetName) 
    { 
     var fileName = string.Format("{0}\\" + strFileName, strDir); 
     string connectionString; 
     if (Excel2007) 
      //read a 2007 file 
      connectionString = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 8.0;HDR=" + (UseHeader == true ? "YES" : "NO") + ";\"", fileName); 
     else 
      //read a 97-2003 file 
      connectionString = string.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=\"Excel 8.0;HDR=" + (UseHeader == true ? "YES" : "NO") + ";\"", fileName); 


     //var connectionString = string.Format("Provider=Microsoft.Jet.OLEDB.4.0; data source={0}; Extended Properties=Excel 8.0;", fileName); 

     var adapter = new OleDbDataAdapter("SELECT * FROM [" + strSheetName + "$]", connectionString); 
     var ds = new DataSet(); 
     adapter.Fill(ds, fileName + strSheetName); 
     return ds.Tables[fileName + strSheetName]; 
    } 

    //Compare datatables 
    private DataTable CompareDataTable(DataTable A, DataTable B) 
    { 
     A.PrimaryKey = new DataColumn[] { A.Columns["PK"] }; 
     B.PrimaryKey = new DataColumn[] { B.Columns["PK"] }; 
     A.Merge(B, true); // this will add to A any records that are in B but not A 
     A.AcceptChanges(); 
     return A.GetChanges(DataRowState.Added); // returns records originally only in B 
    } 


    //Provided here http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/23703a85-20c7-4759-806a-fabf4e9f5be6/ 
    //Provided by Guo Surfer 
    #region Compare two DataTables and return a DataTable with DifferentRecords 

    /// <summary> 
    /// Compare two DataTables and return a DataTable with DifferentRecords 
    /// </summary> 
    /// <param name="FirstDataTable">FirstDataTable</param> 
    /// <param name="SecondDataTable">SecondDataTable</param> 
    /// <returns>DifferentRecords</returns> 
    public DataTable getDifferentRecords(DataTable FirstDataTable, DataTable SecondDataTable) 
    { 
     //Create Empty Table 
     DataTable ResultDataTable = new DataTable("ResultDataTable"); 
     //use a Dataset to make use of a DataRelation object 
     using (DataSet ds = new DataSet()) 
     { 
      //Add tables 
      ds.Tables.AddRange(new DataTable[] { FirstDataTable.Copy(), SecondDataTable.Copy() }); 
      //Get Columns for DataRelation 
      DataColumn[] firstColumns = new DataColumn[ds.Tables[0].Columns.Count]; 
      for (int i = 0; i < firstColumns.Length; i++) 
      { 
       firstColumns[i] = ds.Tables[0].Columns[i]; 
      } 
      DataColumn[] secondColumns = new DataColumn[ds.Tables[1].Columns.Count]; 
      for (int i = 0; i < secondColumns.Length; i++) 
      { 
       secondColumns[i] = ds.Tables[1].Columns[i]; 
      } 
      //Create DataRelation 
      DataRelation r1 = new DataRelation(string.Empty, firstColumns, secondColumns, false); 
      ds.Relations.Add(r1); 
      DataRelation r2 = new DataRelation(string.Empty, secondColumns, firstColumns, false); 
      ds.Relations.Add(r2); 
      //Create columns for return table 
      for (int i = 0; i < FirstDataTable.Columns.Count; i++) 
      { 
       ResultDataTable.Columns.Add(FirstDataTable.Columns[i].ColumnName, FirstDataTable.Columns[i].DataType); 
      } 
      //If FirstDataTable Row not in SecondDataTable, Add to ResultDataTable. 
      ResultDataTable.BeginLoadData(); 
      foreach (DataRow parentrow in ds.Tables[0].Rows) 
      { 
       DataRow[] childrows = parentrow.GetChildRows(r1); 
       if (childrows == null || childrows.Length == 0) 
        ResultDataTable.LoadDataRow(parentrow.ItemArray, true); 
      } 
      //If SecondDataTable Row not in FirstDataTable, Add to ResultDataTable. 
      foreach (DataRow parentrow in ds.Tables[1].Rows) 
      { 
       DataRow[] childrows = parentrow.GetChildRows(r2); 
       if (childrows == null || childrows.Length == 0) 
        ResultDataTable.LoadDataRow(parentrow.ItemArray, true); 
      } 
      ResultDataTable.EndLoadData(); 
     } 
     return ResultDataTable; 
    } 

    #endregion 

    private void ExportDataTableToExcel(DataTable dt, string strFilePath) 
    { 
    // Create the CSV file to which grid data will be exported. 
    StreamWriter sw = new StreamWriter(strFilePath, false); 
    // First we will write the headers. 
    //DataTable dt = m_dsProducts.Tables[0]; 
    int iColCount = dt.Columns.Count; 
    for (int i = 0; i < iColCount; i++) 
    { 
     sw.Write(dt.Columns[i]); 
     if (i < iColCount - 1) 
     { 
      sw.Write(","); 
     } 
    } 
    sw.Write(sw.NewLine); 
    // Now write all the rows. 
    foreach (DataRow dr in dt.Rows) 
    { 
     for (int i = 0; i < iColCount; i++) 
     { 
      if (!Convert.IsDBNull(dr[i])) 
      { 
       sw.Write(dr[i].ToString()); 
      } 
      if (i < iColCount - 1) 
      { 
       sw.Write(","); 
      } 
     } 
     sw.Write(sw.NewLine); 
    } 
    sw.Close(); 

    } 



    #endregion