根据条件单元格的值改变单元格的显示色块和文字颜色等属性。

        #region 设置单元格样式(设置背景色)
        /// <summary>
        /// 设置单元格样式(设置背景色)
        /// </summary>
        /// <param name="gridView"></param>
        /// <param name="fieldName">"States"；"OrderStatus"</param>
        /// <param name="color">Color.Green；Color.FromArgb(30, 119, 194)</param>
        /// <param name="expression">表达式(条件)，如[LowPrice] > [PrevPrice]；"AuditStatus=='已审核'"；[Name] != ?</param>
        public static void SetStyleFormatCondition(this GridView gridView, string fieldName, Color color, string expression)
        {
            GridColumn gc = gridView.Columns[fieldName];
            StyleFormatCondition condition1 = new DevExpress.XtraGrid.StyleFormatCondition();
            condition1.Column = gc;
            condition1.Appearance.BackColor = color;
            condition1.Appearance.Options.UseBackColor = true;
            condition1.Condition = FormatConditionEnum.Expression;
            condition1.Expression = expression;
            gridView.FormatConditions.Add(condition1);
        }
        /// <summary>
        /// 设置单元格样式(设置背景色)
        /// </summary>
        /// <param name="gridView"></param>
        /// <param name="fieldName">"States"；"OrderStatus"</param>
        /// <param name="color">Color.Green；Color.FromArgb(30, 119, 194)</param>
        /// <param name="condition">FormatConditionEnum.Equal；None,Equal,NotEqual,Between,NotBetween,Less,Greater,GreaterOrEqual,LessOrEqual,Expression,</param>
        /// <param name="conditionValue1">0；"已提交"</param>
        /// <param name="conditionValue2">用于两个值取区间</param>
        public static void SetStyleFormatCondition(this GridView gridView, string fieldName, Color color, FormatConditionEnum condition, object conditionValue1, object conditionValue2)
        {
            GridColumn gc = gridView.Columns[fieldName];
            StyleFormatCondition condition1;
            if (conditionValue2 == null)
            {
                condition1 = new DevExpress.XtraGrid.StyleFormatCondition(condition, gc, null,
                    conditionValue1);
            }
            else
            {
                condition1 = new DevExpress.XtraGrid.StyleFormatCondition(condition, gc, null,
                    conditionValue1, conditionValue2);
            }
            condition1.Appearance.BackColor = color;
            condition1.Appearance.Options.UseBackColor = true;
            gridView.FormatConditions.Add(condition1);
        }
        #endregion


        #region 设置单元格(字体颜色)
        /// <summary>
        /// 设置单元格(字体颜色)
        /// </summary>
        /// <param name="gridView"></param>
        /// <param name="fieldName">"States"；"OrderStatus"</param>
        /// <param name="color">Color.Green；Color.FromArgb(30, 119, 194)</param>
        /// <param name="expression">表达式(条件)，如[LowPrice] > [PrevPrice]；"AuditStatus=='已审核'"；[Name] != ?</param>
        public static void SetStyleFormatFontCondition(this GridView gridView, string fieldName, Color color, string expression)
        {
            GridColumn gc = gridView.Columns[fieldName];
            StyleFormatCondition condition1 = new DevExpress.XtraGrid.StyleFormatCondition();
            condition1.Column = gc;
            condition1.Appearance.ForeColor = color;
            condition1.Appearance.Options.UseForeColor = true;
            condition1.Appearance.Options.UseTextOptions = true;
            condition1.Condition = FormatConditionEnum.Expression;
            condition1.Expression = expression;
            gridView.FormatConditions.Add(condition1);
        }
        /// <summary>
        /// 设置单元格(字体颜色)
        /// </summary>
        /// <param name="gridView"></param>
        /// <param name="fieldName">"States"；"OrderStatus"</param>
        /// <param name="color">Color.Green；Color.FromArgb(30, 119, 194)</param>
        /// <param name="condition">FormatConditionEnum.Equal;FormatConditionEnum.GreaterOrEqual</param>
        /// <param name="conditionValue1">0；"已提交"</param>
        /// <param name="conditionValue2">用于与conditionValue1求区间范围</param>
        public static void SetStyleFormatFontCondition(this GridView gridView, string fieldName, Color color, FormatConditionEnum condition, object conditionValue1,object conditionValue2 = null)
        {
            GridColumn gc = gridView.Columns[fieldName];
            StyleFormatCondition condition1;
            if (conditionValue2 == null)
            {
                condition1 = new DevExpress.XtraGrid.StyleFormatCondition(condition, gc, null,
                    conditionValue1);
            }
            else
            {
                condition1 = new DevExpress.XtraGrid.StyleFormatCondition(condition, gc, null,
                    conditionValue1, conditionValue2);
            }
            condition1.Appearance.ForeColor = color;
            condition1.Appearance.Options.UseForeColor = true;
            condition1.Appearance.Options.UseTextOptions = true;
            gridView.FormatConditions.Add(condition1);
        }
        #endregion

设置列背景色  https://www.cnblogs.com/MuNet/p/5736172.html
Devexpress GridView 数据根据不同条件格式化显示色块和文字颜色  http://www.zhimengzhe.com/asp_netjiaocheng/161557.html
Devexpress Winform Gridcontrol 中根据条件单元格的值改变单元格的颜色等属性。  http://www.lxway.com/668495256.htm

condition1.Expression = "[Name] != ?"; //Name字段不为空

cn.Appearance.BackColor = Color.Green;