DataGridView自定義行樣式和行標題

定義兩個樣式對象：

 //定義兩種行樣式
        private DataGridViewCellStyle m_RowStyleNormal;
        private DataGridViewCellStyle m_RowStyleAlternate;

 在窗體加載的時候對樣式進行設置：

        /// <summary>
        /// 設置行樣式
        /// </summary>
        private void SetRowStyle()
        {
            //可根據需要設置更多樣式屬性，如字體、對齊、前景色、背景色等
            this.m_RowStyleNormal = new DataGridViewCellStyle();
            this.m_RowStyleNormal.BackColor = Color.LightBlue;
            this.m_RowStyleNormal.SelectionBackColor = Color.LightSteelBlue;
            this.m_RowStyleAlternate = new DataGridViewCellStyle();
            this.m_RowStyleAlternate.BackColor = Color.LightGray;
            this.m_RowStyleAlternate.SelectionBackColor = Color.LightSlateGray;
        }

定義演示數據：

    /// <summary>
        /// 綁定數據
        /// </summary>
        private void BindData()
        {
            //建立一個DataTable並填充數據，然后綁定到DataGridView控件上
            m_GradeTable = new DataTable();
            m_GradeTable.Columns.Add("Class", typeof(string));
            m_GradeTable.Columns.Add("Name", typeof(string));
            m_GradeTable.Columns.Add("Grade", typeof(int));
            m_GradeTable.Rows.Add(new string[] { "Class1", "Jim", "89" });
            m_GradeTable.Rows.Add(new string[] { "Class1", "Jack", "77" });
            m_GradeTable.Rows.Add(new string[] { "Class1", "Bill", "91" });
            m_GradeTable.Rows.Add(new string[] { "Class2", "Tom", "58" });
            m_GradeTable.Rows.Add(new string[] { "Class2", "Rose", "95" });
            m_GradeTable.Rows.Add(new string[] { "Class3", "Peter", "64" });
            m_GradeTable.Rows.Add(new string[] { "Class3", "David", "82" });
            m_GradeTable.Rows.Add(new string[] { "Class3", "Eric", "68" });
            m_GradeTable.Rows.Add(new string[] { "Class3", "Lily", "79" });
            this.bdsGrade.DataSource = m_GradeTable;
        }

在DataGridView控件的CellFormatting事件中實現設置行樣式、單元格樣式和行號：

  private void dgvDataTable_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            //在此對行樣式進行設置
            
            if (e.ColumnIndex == this.dgvGrade.Columns["ColumnClass"].Index)//根據班級設置行樣式
            {
                DataGridViewRow CurrentRow = this.dgvGrade.Rows[e.RowIndex];
                CurrentRow.HeaderCell.Value = Convert.ToString(e.RowIndex + 1);//顯示行號，也可以設置成顯示其他信息
                //CurrentRow.HeaderCell.ToolTipText = "當前第" + Convert.ToString(e.RowIndex + 1) + "行";//設置ToolTip信息
                //以下為根據上一行內容判斷所屬組的效果
                if (e.RowIndex == 0)//首行必須特殊處理，將其設置為常規樣式
                {
                    CurrentRow.DefaultCellStyle = this.m_RowStyleNormal;
                }
                else
                {
                    //判斷和上一行是否屬於同一個班級，如果是則設置相同樣式，否則設置另一種樣式
                    //需要定義兩個DataGridViewCellStyle，用於交替顯示，也可以根據需要隱藏一些和上一行重復的信息
                    //這里當兩行是同一個班級時，將下一行的班級信息隱藏掉，選中時則顯示班級信息
                    if (CurrentRow.Cells[e.ColumnIndex].Value != DBNull.Value && CurrentRow.Cells[e.ColumnIndex].Value != null
                        && CurrentRow.Cells[e.ColumnIndex].Value.ToString() == this.dgvGrade.Rows[e.RowIndex - 1].Cells[e.ColumnIndex].Value.ToString())
                    {
                        CurrentRow.DefaultCellStyle = this.dgvGrade.Rows[e.RowIndex - 1].DefaultCellStyle;//設置和上一行的樣式相同
                        CurrentRow.Cells[e.ColumnIndex].Style.ForeColor = CurrentRow.DefaultCellStyle.BackColor;//用前景色隱藏信息
                        //如果需要選中時顯示完整信息則注釋該下面一行
                        //CurrentRow.Cells[e.ColumnIndex].Style.SelectionForeColor = CurrentRow.DefaultCellStyle.SelectionBackColor;//選中時也使前景色等於背景色，將文字隱藏掉
                    }
                    else//當前行和上一行不屬於同一個班級時
                    {
                        if (this.dgvGrade.Rows[e.RowIndex - 1].DefaultCellStyle == this.m_RowStyleNormal)//根據上一行的樣式設置當前行的樣式
                            CurrentRow.DefaultCellStyle = this.m_RowStyleAlternate;
                        else
                            CurrentRow.DefaultCellStyle = this.m_RowStyleNormal;
                    }
                }//if(e.RowIndex == 0)
            }
            else if (e.ColumnIndex == this.dgvGrade.Columns["ColumnGrade"].Index)//根據成績設置單元格樣式
            {
                if (this.dgvGrade.Rows[e.RowIndex].Cells[e.ColumnIndex].Value != DBNull.Value 
                    && Convert.ToInt32(this.dgvGrade.Rows[e.RowIndex].Cells[e.ColumnIndex].Value) < 60)//對不及格的成績設置特殊樣式
                {
                    this.dgvGrade.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.ForeColor = Color.Red;//設置小於60的數字顯示為紅色
                    this.dgvGrade.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.SelectionForeColor = Color.Red;
                    this.dgvGrade.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.Alignment = DataGridViewContentAlignment.MiddleRight;
                }
            }
        }

在DataGridView控件的RowPostPaint事件中實現行標題圖標繪制和提示信息設置：

 //根據內容設置行標頭
        private void dgvDataTable_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            if (this.dgvGrade.Rows[e.RowIndex].Cells["ColumnGrade"].Value == DBNull.Value)
                return;
            int intGrade = Convert.ToInt32(this.dgvGrade.Rows[e.RowIndex].Cells["ColumnGrade"].Value);//獲取成績
            Image RowIcon;//標頭圖標
            string strToolTip;//提示信息
            if (intGrade >= 90)
            {
                RowIcon = TestDataGridViewRowStyle.Properties.Resources.GradeA;//從資源文件中獲取圖片
                strToolTip = "Grade A";
            }
            else if (intGrade >= 80)
            {
                RowIcon = TestDataGridViewRowStyle.Properties.Resources.GradeB;
                strToolTip = "Grade B";
            }
            else if (intGrade >= 70)
            {
                RowIcon = TestDataGridViewRowStyle.Properties.Resources.GradeC;
                strToolTip = "Grade C";
            }
            else if (intGrade >= 60)
            {
                RowIcon = TestDataGridViewRowStyle.Properties.Resources.GradeD;
                strToolTip = "Grade D";
            }
            else
            {
                RowIcon = TestDataGridViewRowStyle.Properties.Resources.GradeF;
                strToolTip = "Grade F";
            }
            e.Graphics.DrawImage(RowIcon, e.RowBounds.Left + this.dgvGrade.RowHeadersWidth - 20, e.RowBounds.Top + 4, 16, 16);//繪制圖標
            this.dgvGrade.Rows[e.RowIndex].HeaderCell.ToolTipText = strToolTip;//設置提示信息
        }