刪除空行和列從一個CSV文件 - C＃

Question

我想「乾淨」的CSV文件：

• 刪除空行
• 刪除空列

的行或列它們不是完全空的，例如： 「」，「」，「」，「」，「」，「」，「」，「」，「」，「」，「」，「」，「」 ，「」， （成行） 或 「」，「」，「」，「」，「」，「」，「」，「」，「」，「」， ） OR

「」，

「」，

「」，

「」，

「」，

「」，

「 「，

（以列的形式）

這些行或列可以位於CSV文件的任何位置。

我有什麼至今：

private void button1_Click(object sender, EventArgs e) 
     { 

      string sourceFile = @"XXXXX.xlsx"; 
      string worksheetName = "Sample"; 
      string targetFile = @"C:\Users\xxxx\xls_test\XXXX.csv"; 

      // Creates the CSV file based on the XLS file 
      ExcelToCSVCoversion(sourceFile, worksheetName, targetFile); 

      // Manipulate the CSV: Clean empty rows 
      DeleteEmptyRoadFromCSV(targetFile); 
     } 

     static void ExcelToCSVCoversion(string sourceFile, string worksheetName, 
      string targetFile) 
     { 
      string connectionString = @"Provider =Microsoft.ACE.OLEDB.12.0;Data Source=" + sourceFile 
       + @";Extended Properties=""Excel 12.0 Xml;HDR=YES"""; 
      OleDbConnection connection = null; 
      StreamWriter writer = null; 
      OleDbCommand command = null; 
      OleDbDataAdapter dataAdapter = null; 

      try 
      { 
       // Represents an open connection to a data source. 
       connection = new OleDbConnection(connectionString); 
       connection.Open(); 

       // Represents a SQL statement or stored procedure to execute 
       // against a data source. 
       command = new OleDbCommand("SELECT * FROM [" + worksheetName + "$]", 
              connection); 
       // Specifies how a command string is interpreted. 
       command.CommandType = CommandType.Text; 
       // Implements a TextWriter for writing characters to the output stream 
       // in a particular encoding. 
       writer = new StreamWriter(targetFile); 
       // Represents a set of data commands and a database connection that are 
       // used to fill the DataSet and update the data source. 
       dataAdapter = new OleDbDataAdapter(command); 

       DataTable dataTable = new DataTable(); 
       dataAdapter.Fill(dataTable); 

       for (int row = 0; row < dataTable.Rows.Count; row++) 
       { 
        string rowString = ""; 
        for (int column = 0; column < dataTable.Columns.Count; column++) 
        { 
         rowString += "\"" + dataTable.Rows[row][column].ToString() + "\","; 
        } 
        writer.WriteLine(rowString); 
       } 

       Console.WriteLine(); 
       Console.WriteLine("The excel file " + sourceFile + " has been converted " + 
            "into " + targetFile + " (CSV format)."); 
       Console.WriteLine(); 
      } 
      catch (Exception exception) 
      { 
       Console.WriteLine(exception.ToString()); 
       Console.ReadLine(); 
      } 
      finally 
      { 
       if (connection.State == ConnectionState.Open) 
       { 
        connection.Close(); 
       } 
       connection.Dispose(); 
       command.Dispose(); 
       dataAdapter.Dispose(); 
       writer.Close(); 
       writer.Dispose(); 
      } 
     } 

     static void DeleteEmptyRoadFromCSV(string fileName) 
     { 
      //string nonEmptyLines = @"XXXX.csv"; 
      var nonEmptyLines = File.ReadAllLines(fileName) 
         .Where(x => !x.Split(',') 
            .Take(2) 
            .Any(cell => string.IsNullOrWhiteSpace(cell)) 
         // use `All` if you want to ignore only if both columns are empty. 
         ).ToList(); 

     File.WriteAllLines(fileName, nonEmptyLines); 
     } 

最後，我試圖從用意念： Remove Blank rows from csv c#。但是我的輸出完全沒有變化。

歡迎任何幫助！

謝謝。

Answer 1

在保存csv之前，您可以從表中刪除列/行。 方法沒有經過測試，但你應該明白這個概念。

static void ExcelToCSVCoversion(string sourceFile, string worksheetName, 
     string targetFile) 
    { 
     string connectionString = @"Provider =Microsoft.ACE.OLEDB.12.0;Data Source=" + sourceFile 
      + @";Extended Properties=""Excel 12.0 Xml;HDR=YES"""; 
     OleDbConnection connection = null; 
     StreamWriter writer = null; 
     OleDbCommand command = null; 
     OleDbDataAdapter dataAdapter = null; 

     try 
     { 
      // Represents an open connection to a data source. 
      connection = new OleDbConnection(connectionString); 
      connection.Open(); 

      // Represents a SQL statement or stored procedure to execute 
      // against a data source. 
      command = new OleDbCommand("SELECT * FROM [" + worksheetName + "$]", 
             connection); 
      // Specifies how a command string is interpreted. 
      command.CommandType = CommandType.Text; 
      // Implements a TextWriter for writing characters to the output stream 
      // in a particular encoding. 
      writer = new StreamWriter(targetFile); 
      // Represents a set of data commands and a database connection that are 
      // used to fill the DataSet and update the data source. 
      dataAdapter = new OleDbDataAdapter(command); 

      DataTable dataTable = new DataTable(); 
      dataAdapter.Fill(dataTable); 
      var emptyRows = 
       dataTable.Select() 
        .Where(
         row => 
          dataTable.Columns.Cast<DataColumn>() 
           .All(column => string.IsNullOrEmpty(row[column].ToString()))).ToArray(); 
      Array.ForEach(emptyRows, x => x.Delete()); 

      var emptyColumns = 
       dataTable.Columns.Cast<DataColumn>() 
        .Where(column => dataTable.Select().All(row => string.IsNullOrEmpty(row[column].ToString()))) 
        .ToArray(); 
      Array.ForEach(emptyColumns, column => dataTable.Columns.Remove(column)); 
      dataTable.AcceptChanges(); 

      for (int row = 0; row < dataTable.Rows.Count; row++) 
      { 
       string rowString = ""; 
       for (int column = 0; column < dataTable.Columns.Count; column++) 
       { 
        rowString += "\"" + dataTable.Rows[row][column].ToString() + "\","; 
       } 
       writer.WriteLine(rowString); 
      } 

      Console.WriteLine(); 
      Console.WriteLine("The excel file " + sourceFile + " has been converted " + 
           "into " + targetFile + " (CSV format)."); 
      Console.WriteLine(); 
     } 
     catch (Exception exception) 
     { 
      Console.WriteLine(exception.ToString()); 
      Console.ReadLine(); 
     } 
     finally 
     { 
      if (connection.State == ConnectionState.Open) 
      { 
       connection.Close(); 
      } 
      connection.Dispose(); 
      command.Dispose(); 
      dataAdapter.Dispose(); 
      writer.Close(); 
      writer.Dispose(); 
     } 
    } 

Answer 2

請檢查下面的查詢是working.I我得到的所有行：

var nonEmptyLines = File.ReadAllLines(FileName) 
         .Where(x => !x.Split(',') 
            .Take(2) 
            .Any(cell => string.IsNullOrWhiteSpace(cell)) 
         // use `All` if you want to ignore only if both columns are empty. 
         ).ToList(); 

我想你可以使用的東西，如：

var nonEmptyLines = File.ReadAllLines(File). 
         SkipWhile(cell=>{var arr=cell.Split(',');if(string.IsNullOrWhiteSpace(cell)){ 
          return true; 
         } 
          else 
         { 
          return false; 
         } 
         });