DataGridView：根据条件改变单元格的颜色

根据条件改变DataGridView行的颜色可以使用RowPrePaint事件。

示例程序界面如下：

示例程序代码如下：

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using System.Configuration;
 using System.Data.SqlClient;

 namespace DgvChangeColor
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         string strCon = ConfigurationManager.ConnectionStrings["DbConnection"].ConnectionString;
         private void Form1_Load(object sender, EventArgs e)
         {
             DataTable dt = GetDataSource();
             this.DgvColor.DataSource = dt;
         }

         private void DgvColor_RowPrePaint(object sender, DataGridViewRowPrePaintEventArgs e)
         {
             if (e.RowIndex >= DgvColor.Rows.Count - )
             {
                 return;
             }
             DataGridViewRow dr = (sender as DataGridView).Rows[e.RowIndex];

             if (dr.Cells["项目代码"].Value.ToString().Trim().Equals("ACAC0001"))
             {
                 // 设置单元格的背景色
                 dr.DefaultCellStyle.BackColor = Color.Yellow;
                 // 设置单元格的前景色
                 dr.DefaultCellStyle.ForeColor = Color.Black;
             }
             else
             {
                 dr.DefaultCellStyle.BackColor = Color.Blue;
                 dr.DefaultCellStyle.ForeColor = Color.White;
             }
         }

         private DataTable GetDataSource()
         {
             DataTable dt = new DataTable();
             SqlConnection conn = new SqlConnection(strCon);
             string strSQL = "SELECT XIANGMUCDDM AS '项目代码',XIANGMUMC AS '项目名称', DANJIA AS '单价',SHULIANG AS '数量' FROM InPatientBillDt WHERE 就诊ID='225600'";
             SqlCommand cmd = new SqlCommand(strSQL, conn);
             SqlDataAdapter adapter = new SqlDataAdapter();
             adapter.SelectCommand = cmd;
             try
             {
                 conn.Open();
                 adapter.Fill(dt);
             }
             catch (Exception ex)
             {
                 MessageBox.Show(ex.Message);
             }
             finally
             {
                 conn.Close();
             }
             return dt;
         }
     }
 }

示例程序下载地址：https://pan.baidu.com/s/1sm2eSlZ