动态更改datagridview单元格颜色

Question

我有一个数据填充的dataGridView对象。我想单击一个按钮并使其更改单元格背景的颜色。这是我目前有

foreach(DataGridViewRow row in dataGridView1.Rows) 
{ 
    foreach(DataGridViewColumn col in dataGridView1.Columns) 
    { 
      //row.Cells[col.Index].Style.BackColor = Color.Green; //doesn't work 
      //col.Cells[row.Index].Style.BackColor = Color.Green; //doesn't work 
     dataGridView1[col.Index, row.Index].Style.BackColor = Color.Green; //doesn't work 
    } 
} 

这三个原因，重复地重新绘制了自身的表，并试图重新大小的表变得一团糟。单击单元格时，该值将保持高亮显示，并且背景颜色不会更改。

问：如何在表格存在后更改单个单元格的背景颜色？

Answer 1

这对我的作品

dataGridView1.Rows[rowIndex].Cells[columnIndex].Style.BackColor = Color.Red; 

Answer 2

由于它的工作

我在这里用这个工作由数量字段是零意味着它表明，细胞是红色

 int count = 0; 

     foreach (DataGridViewRow row in ItemDg.Rows) 
     { 
      int qtyEntered = Convert.ToInt16(row.Cells[1].Value); 
      if (qtyEntered <= 0) 
      { 
       ItemDg[0, count].Style.BackColor = Color.Red;//to color the row 
       ItemDg[1, count].Style.BackColor = Color.Red; 

       ItemDg[0, count].ReadOnly = true;//qty should not be enter for 0 inventory      
      } 
      ItemDg[0, count].Value = "0";//assign a default value to quantity enter 
      count++; 
     } 

    } 

Answer 3

实施您自己的DataGridViewTextBoxCell的扩展并重写像这样的Paint方法：

class MyDataGridViewTextBoxCell : DataGridViewTextBoxCell 
{ 
    protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, 
     DataGridViewElementStates cellState, object value, object formattedValue, string errorText, 
     DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts) 
    { 
     if (value != null) 
     { 
      if ((bool) value) 
      { 
       cellStyle.BackColor = Color.LightGreen; 
      } 
      else 
      { 
       cellStyle.BackColor = Color.OrangeRed; 
      } 
     } 
     base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, 
      formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts); 
} 

}

然后在你列的CellTemplate属性设置为你的类

columns.Add(new DataGridViewTextBoxColumn() {CellTemplate = new MyDataGridViewTextBoxCell()});