C＃：從datagridview中選擇某些行

Question

 string[] column0Array = new string[dataGridView1.Rows.Count]; 
     string[] column1Array = new string[dataGridView1.Rows.Count]; 


     int k = 0; 

     List<DataGridViewRow> rows = null; 
     for (int i = 0; i < dataGridView1.Rows.Count; i++) 
     { 
      if (rows != null) 
      if (i % 4 == 0) 
       rows.Add(dataGridView1.Rows[i]); 

      foreach (DataGridViewRow row in dataGridView1.Rows) 
       // if (dataGridView1.Rows.IndexOf(i%4 ==)) 


       { 
        column0Array[k] = row.Cells[0].Value != null ? row.Cells[0].Value.ToString() : string.Empty; 
        column1Array[k] = row.Cells[1].Value != null ? row.Cells[1].Value.ToString() : string.Empty; 

        k++; 
       } 
     } 

類似這樣的東西？我有未處理的異常...

Answer 1

List<DataGridViewRow> rows = null; 
for (int i =0;i<dataGridView1.Rows.Count;i++) 
{ 
    if(i%4==0) 
    rows.Add(dataGridView1.Rows[i]); 

    column0Array[i] = dataGridView1.Rows[i].Cells[0].Value != null ? dataGridView1.Rows[i].Cells[0].Value.ToString() : string.Empty; 
    column1Array[i] = dataGridView1.Rows[i].Cells[1].Value != null ? dataGridView1.Rows[i].Cells[1].Value.ToString() : string.Empty; 

}