DataGridView单元格内容换行显示及设置背景色

　　类准备不复述了，点这里。

　　说下思路：DataGridView单元格显示内容是通过对象的ToString()方法获取的，所以重写要换行的列的ToString()方法即可。实现换行需要设置DataGridView的两个属性：1、在属性窗口找到AutoSizeRowsMode，设置为AllCells(此设置表示让行间距适应单元格内容高度)；2、在属性窗口找到DefaultCellStyle，打开属性编辑窗口，设置WrapMode为true(此设置表示单元格内容长度超出则换行显示)。下面给出增加的代码。

　　新增类Col_3，如下：

        class Col_3
        {
            int _dto, _dfo;

            public Col_3(int dto, int dfo)
            {
                _dto = dto;
                _dfo = dfo;
            }

            public override string ToString()
            {
                return string.Format("DTO:{0}{1}DFO:{2}", _dto, Environment.NewLine, _dfo);
            }
        }

　　在Character类中增加Col_3属性，如下：

        class Character : INotifyPropertyChanged
        {
            string _name;
            [DisplayName("你的名字")]  // 这是显示的列名称哦
            public string Name
            {
                get { return _name; }
                set
                {
                    if (_name != value)
                    {
                        _name = value;
                        NotifyPropertyChanged("Name");
                    }
                }
            }

            // 2) 在属性改变时引发事件
            int _age;
            [DisplayName("他的年纪")]
            public int Age
            {
                get { return _age; }
                set
                {
                    if (_age != value)
                    {
                        _age = value;
                        NotifyPropertyChanged("Age");
                    }
                }
            }

            Col_3 _customCol;
            public Col_3 CustomCol
            {
                get { return _customCol; }
                set
                {
                    if (_customCol != value)
                    {
                        _customCol = value;
                        NotifyPropertyChanged("CustomCol");
                    }
                }
            }

            PropertyChangedEventHandler _propertyChanged;
            public event PropertyChangedEventHandler PropertyChanged
            {
                add { _propertyChanged += value; }
                remove { _propertyChanged -= value; }
            }

            private void NotifyPropertyChanged(string property_name)
            {
                _propertyChanged?.Invoke(this, new PropertyChangedEventArgs(property_name));
            }
        }  /* end of class Character */

　　添加CellFormatting事件处理，根据内容设置背景，如下：

        private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if (e.RowIndex < 0 || e.ColumnIndex < 0)
                return;

            if (e.Value is Col_3)   // if( (e.Value as Col_3)?.DTO > 0 ) ...
                e.CellStyle.BackColor = Color.Green;
            else if (e.Value is string)
                e.CellStyle.BackColor = Color.Salmon;
            else if (e.Value is int)
                e.CellStyle.BackColor = Color.Blue;
        }

　　在Init()方法中添加数据测试，如下：

        void Init()
        {
            _dtSource = new DataTable();
            _bdList = new BindingList<Character>();
            _bdSource = new BindingSource();
            _bdSource.DataSource = _bdList;  // 3) 绑定数据源，由BindingSoource组件处理细节

            _dtSource.Columns.Add(new DataColumn("Name"));
            _dtSource.Columns.Add(new DataColumn("Age"));

            DataRow dr;

            dr = _dtSource.NewRow();
            dr["Name"] = "1";
            dr["Age"] = "21";
            _dtSource.Rows.Add(dr);

            dr = _dtSource.NewRow();
            dr[0] = "2";
            dr[1] = "23";
            _dtSource.Rows.Add(dr);

            _dtSource.Rows.Add(3, 27);

            _bdList.Add(new Character() { Name = "1", Age = 21, CustomCol = new Col_3(0, 0) });
            _bdList.Add(new Character() { Name = "2", Age = 23, CustomCol = new Col_3(1, 1) });
            _bdList.Add(new Character() { Name = "3", Age = 27, CustomCol = new Col_3(2, 2) });
        }

效果：