將TreeView節點拖到DataGridView單元格問題

我已經編寫了此例程以將TreeView節點值拖放到DataGridView單元格上。將TreeView節點拖到DataGridView單元格問題

private void dataGridView1_DragDrop(object sender, DragEventArgs e) 
     { 
      if (e.Data.GetDataPresent(typeof(string))) 
      { 
       #region Find Row and Cell from Mouse Position 
       Point grvScreenLocation = dataGridView1.PointToScreen(dataGridView1.Location); 
       int tempX = DataGridView.MousePosition.X - grvScreenLocation.X + dataGridView1.Left; 
       int tempY = DataGridView.MousePosition.Y - grvScreenLocation.Y + dataGridView1.Top; 

       DataGridView.HitTestInfo hit = dataGridView1.HitTest(tempX, tempY); 

       int cellX = hit.RowIndex; 
       int cellY = hit.ColumnIndex; 
       #endregion 

       string droppedString = e.Data.GetData(typeof(string)) as string; 

       DataGridViewRow selectedRow = dataGridView1.Rows[cellX]; 
       DataGridViewCell selectedCell = dataGridView1.Rows[cellX].Cells[cellY]; 

       if (!selectedRow.IsNewRow) 
       { 
        selectedCell.Value = droppedString; 
        selectedCell.Tag = droppedString; 
        selectedCell.OwningRow.Cells[3].Value = colMappingType.Items[0]; 
       } 
       else 
       {      
        dataGridView1.Rows.Add(); 
        dataGridView1.Rows[dataGridView1.Rows.Count-2].Cells[cellY].Value = droppedString; 
        dataGridView1.Rows[dataGridView1.Rows.Count-2].Cells[cellY].Tag = droppedString; 
        dataGridView1.Rows[dataGridView1.Rows.Count - 2].Cells[3].Value = colMappingType.Items[1]; 
       } 
      } 
     }

而且我寫這個程序來測試是否實際上已被填充細胞：

private void button1_Click(object sender, EventArgs e) 
     { 
      DataTable dataTable = new DataTable(); 
      dataTable.TableName = "Test"; 

      dataTable.Columns.Add("ColOne", typeof(bool)); 
      dataTable.Columns.Add("ColTwo", typeof(string)); 
      dataTable.Columns.Add("ColThr", typeof(string)); 
      dataTable.Columns.Add("ColFor"); 

      foreach (DataGridViewRow dgvRow in dataGridView1.Rows) 
      { 
       DataRow dataRow = dataTable.NewRow(); 

       int i=0; 
       foreach (DataGridViewCell dgvCell in dgvRow.Cells) 
       { 
        dataRow.ItemArray.SetValue(dgvCell.Value, i); 
        ++i; 
       } 

       dataTable.Rows.Add(dataRow);     
      } 

      Form2 f = new Form2(); 
      f.DataGridView.DataSource = dataTable; 
      f.Show(); 
     } 
    }

測試代碼顯示在Form2新DataGridView有行數和列數正確。但不包含任何數據。

究竟發生了什麼？

如何解決這個問題？

編輯：

這段代碼解決了這個問題。

private void button1_Click(object sender, EventArgs e) 
     { 
      DataTable dataTable = new DataTable(); 
      dataTable.TableName = "Test"; 

      dataTable.Columns.Add("ColOne", typeof(bool)); 
      dataTable.Columns.Add("ColTwo", typeof(string)); 
      dataTable.Columns.Add("ColThr", typeof(string)); 
      dataTable.Columns.Add("ColFor"); 

      foreach (DataGridViewRow dgvRow in dataGridView1.Rows) 
      { 
       if (dgvRow.Cells[0].Value != null 
        && dgvRow.Cells[1].Value != null 
        && dgvRow.Cells[2].Value != null 
        && dgvRow.Cells[3].Value != null) 
       { 
        DataRow dataRow = dataTable.NewRow(); 

        dataRow[0] = dgvRow.Cells[0].Value; 
        dataRow[1] = dgvRow.Cells[1].Value; 
        dataRow[2] = dgvRow.Cells[2].Value; 
        dataRow[3] = dgvRow.Cells[3].Value; 

        dataTable.Rows.Add(dataRow); 
       } 
      } 

      Form2 f = new Form2(); 
      f.DataGridView.DataSource = dataTable; 
      f.Show(); 
     }

來源

2009-12-06 anonymous

我什至不知道如何正確使用ItemArray，但現在你做的方式是行不通的。替換：

dataRow.ItemArray.SetValue(dgvCell.Value, i);

與

dataRow[i] = dgvCell.Value;

來源

2009-12-06 15:28:12

將TreeView節點拖到DataGridView單元格問題

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