如果该dataGridView是跟数据库绑定的，则可以触发DataBindingComplete事件：
private void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
if (this.dataGridView1.Rows.Count != 0)
{
for (int i = 0; i < this.dataGridView1.Rows.Count; )
{
this.dataGridView1.Rows[i].DefaultCellStyle.BackColor = System.Drawing.Color.Pink;
i += 2;
}
}
}
如果没有绑定数据库，那么当dataGridView中的数据有所改变或显示的时候可以添加以下的代码：
if (this.dataGridView1.Rows.Count != 0)
{
for (int i = 0; i < this.dataGridView1.Rows.Count; )
{
this.dataGridView1.Rows[i].DefaultCellStyle.BackColor = System.Drawing.Color.Pink;
i += 2;
}
}