c＃导出到文本文件为导出文件指定列宽

Question

我想在C＃中创建一个应用程序，用户可以手动填充行数据，然后按导出按钮，这会将行导出到文本文件中。

我可以使用下面的代码获取要导出的文件，但是我希望每个列在导出文件时都具有特定的宽度。

我该怎么做？

private void Form1_Load(object sender, EventArgs e) 
    { 
     //If you manually add rows to a DataGridView, you must disable the 
     //AllowUserToAddRows function. The function can be enabled after 
     //you have added the rows. 
     dataGridView1.AllowUserToAddRows = false; 

     //The code below adds Columns to the DataGridView control 

     DataGridViewColumn colHold = new DataGridViewTextBoxColumn(); 
     colHold.Name = "col1"; 
     colHold.HeaderText = "FIELD1"; 
     dataGridView1.Columns.Add(colHold); 


     colHold = new DataGridViewTextBoxColumn(); 

     colHold.Name = "col2"; 
     colHold.HeaderText = "FIELD2"; 
     dataGridView1.Columns.Add(colHold); 

     colHold = new DataGridViewTextBoxColumn(); 

     colHold.Name = "col3"; 
     colHold.HeaderText = "FIELD3"; 
     dataGridView1.Columns.Add(colHold); 

     colHold = new DataGridViewTextBoxColumn(); 

     colHold.Name = "col4"; 
     colHold.HeaderText = "FIELD4"; 
     dataGridView1.Columns.Add(colHold); 

     //The code below adds rows and fills cells with values to be exported. 

     dataGridView1.Rows.Add(); 

     dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[0].Value = "1".PadRight(20); 
     dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[1].Value = "2"; 
     dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[2].Value = "3"; 
     dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[3].Value = "4"; 

     dataGridView1.Rows.Add(); 

     dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[0].Value = "5"; 
     dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[1].Value = "6"; 
     dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[2].Value = "7"; 
     dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[3].Value = "8"; 
    } 

    private void button1_Click(object sender, EventArgs e) 
    { 
     //This line of code creates a text file for the data export. 

     System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\TextFile.csv");   try 
     {     
      string sLine = ""; 


      //This for loop loops through each row in the table 
      for (int r = 0; r <= dataGridView1.Rows.Count - 1; r++) 
      { 
       //This for loop loops through each column, and the row number 
       //is passed from the for loop above. 
       for (int c = 0; c <= dataGridView1.Columns.Count - 1; c++) 
       { 
        sLine = sLine + dataGridView1.Rows[r].Cells[c].Value; 
        if (c != dataGridView1.Columns.Count - 1) 
        { 
         //A comma is added as a text delimiter in order 
         //to separate each field in the text file. 
         //You can choose another character as a delimiter. 
         sLine = sLine + " "; 
        } 
       } 

       //The exported text is written to the text file, one line at a time. 
       file.WriteLine(sLine);      
       sLine = "";      
      } 

      file.Close(); 
      System.Windows.Forms.MessageBox.Show("Exportlete.", "Program Info", MessageBoxButtons.OK, MessageBoxIcon.Information); 
     } 
     catch (System.Exception err) 
     { 
      System.Windows.Forms.MessageBox.Show(err.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); 
      file.Close(); 
     } 
    } 

    private void button2_Click(object sender, EventArgs e) 
    { 

    } 
} 

Answer 1

尝试这样：

  int[] columnWidths = { 10, 20, 30 }; 
      int[] inputData = { 1, 2, 3 }; 

      string output = string.Join("", inputData.Select((x, i) => new string(' ', (columnWidths[i] - x.ToString().Length)) + x.ToString()).ToArray());