自定義DataGridView列

DataGridView 控件提供了多種列類型，使得用戶可以通過多種方式輸入和編輯值。但是，如果這些列類型無法滿足數據輸入要求，您也可以使用承載所選控件的單元格創建自己的列類型。要做到這一點，必須定義派生自 DataGridViewColumn 和 DataGridViewCell 的類。您還必須定義派生自 Control 並實現 IDataGridViewEditingControl 接口的類。

下面的代碼示例演示如何創建日曆列。此列的單元格在普通的文本框單元格中顯示日期，但當用戶編輯單元格時，就會出現 DateTimePicker 控件。

using System;
using System.Windows.Forms;

namespace STUDY.ProcessManager
...{
    public class DataGridViewCalendarColumn : DataGridViewColumn
    ...{
        public DataGridViewCalendarColumn()
            : base(new DataGridViewCalendarCell())
        ...{
        }

        public override DataGridViewCell CellTemplate
        ...{
            get
            ...{
                return base.CellTemplate;
            }
            set
            ...{
                // Ensure that the cell used for the template is a CalendarCell.
                if (value != null &&
                    !value.GetType().IsAssignableFrom(typeof(DataGridViewCalendarCell)))
                ...{
                    throw new InvalidCastException("Must be a CalendarCell");
                }
                base.CellTemplate = value;
            }
        }
    }
 
    public class DataGridViewCalendarCell : DataGridViewTextBoxCell
    ...{

        public DataGridViewCalendarCell()
            : base()
        ...{
            // Use the short date format.
            this.Style.Format = "d";
        }

        public override void InitializeEditingControl(int rowIndex, object
            initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
        ...{
            // Set the value of the editing control to the current cell value.
            base.InitializeEditingControl(rowIndex, initialFormattedValue,
                dataGridViewCellStyle);
            //CalendarEditingControl ctl =
            //    DataGridView.EditingControl as CalendarEditingControl;
            //ctl.Value = (DateTime)this.Value;
        }

        public override Type EditType
        ...{
            get
            ...{
                // Return the type of the editing contol that CalendarCell usesd.
                return typeof(DataGridViewCalendarEditingControl);
            }
        }

        public override Type ValueType
        ...{
            get
            ...{
                // Return the type of the value that CalendarCell contains.
                return typeof(DateTime);
            }
        }

        public override object DefaultNewRowValue
        ...{
            get
            ...{
                // Use the current date and time as the default value.
                return DateTime.Now;
            }
        }
    }

    class DataGridViewCalendarEditingControl : DateTimePicker, IDataGridViewEditingControl
    ...{
        DataGridView dataGridView;
        private bool valueChanged = false;
        int rowIndex;

        public DataGridViewCalendarEditingControl()
        ...{
            this.Format = DateTimePickerFormat.Short;
        }

        // Implements the IDataGridViewEditingControl.EditingControlFormattedValue
        // property.
        public object EditingControlFormattedValue
        ...{
            get
            ...{
                return this.Value.ToShortDateString();
            }
            set
            ...{
                String newValue = value as String;
                if (newValue != null)
                ...{
                    this.Value = DateTime.Parse(newValue);
                }
            }
        }

        // Implements the IDataGridViewEditingControl.GetEditingControlFormattedValue
        // method.
        public object GetEditingControlFormattedValue(
            DataGridViewDataErrorContexts context)
        ...{
            return EditingControlFormattedValue;
        }

        // Implements the IDataGridViewEditingControl.ApplyCellStyleToEditingControl
        // method.
        public void ApplyCellStyleToEditingControl(
            DataGridViewCellStyle dataGridViewCellStyle)
        ...{
            this.Font = dataGridViewCellStyle.Font;
            this.CalendarForeColor = dataGridViewCellStyle.ForeColor;
            this.CalendarMonthBackground = dataGridViewCellStyle.BackColor;
        }

        // Implements the IDataGridViewEditingControl.EditingControlRowIndex
        // property.
        public int EditingControlRowIndex
        ...{
            get
            ...{
                return rowIndex;
            }
            set
            ...{
                rowIndex = value;
            }
        }

        // Implements the IDataGridViewEditingControl.EditingControlWantsInputKey
        // method.
        public bool EditingControlWantsInputKey(
            Keys key, bool dataGridViewWantsInputKey)
        ...{
            // Let the DateTimePicker handle the keys in the next list.
            switch (key & Keys.KeyCode)
            ...{
                case Keys.Left:
                case Keys.Up:
                case Keys.Down:
                case Keys.Right:
                case Keys.Home:
                case Keys.End:
                case Keys.PageDown:
                case Keys.PageUp:
                    return true;
                default:
                    return false;
            }
        }

        // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
        // method.
        public void PrepareEditingControlForEdit(bool selectAll)
        ...{
            // No preparations is needed.
        }

        // Implements the IDataGridViewEditingControl.RepositionEditingControlOnValueChange
        // property.
        public bool RepositionEditingControlOnValueChange
        ...{
            get
            ...{
                return false;
            }
        }

        // Implements the IDataGridViewEditingControl.EditingControlDataGridView
        // property.
        public DataGridView EditingControlDataGridView
        ...{
            get
            ...{
                return dataGridView;
            }
            set
            ...{
                dataGridView = value;
            }
        }

        // Implements the IDataGridViewEditingControl.EditingControlValueChanged
        // property.
        public bool EditingControlValueChanged
        ...{
            get
            ...{
                return valueChanged;
            }
            set
            ...{
                valueChanged = value;
            }
        }

        // Implements the IDataGridViewEditingControl.EditingPanelCursor
        // property.
        public Cursor EditingPanelCursor
        ...{
            get
            ...{
                return base.Cursor;
            }
        }

        protected override void OnValueChanged(EventArgs eventargs)
        ...{
            // Notify the DataGridView when the cell's contents was changed.
            valueChanged = true;
            this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
            base.OnValueChanged(eventargs);
        }
    }
} 

使用自定義列:
您可以將以上代碼添加到您的已經擁有一個Windows窗體的工程內.並在窗體的Load事件中加入以下代碼.
執行您的工程,並驗證它是否是您所需要的.

            DataGridView dataGridView1 = new  DataGridView();
            DataGridViewTextBoxColumn Column1 = new DataGridViewTextBoxColumn();
            DataGridViewCalendarColumn Column2 = new DataGridViewCalendarColumn();

            ((System.ComponentModel.ISupportInitialize)(dataGridView1)).BeginInit();
            this.SuspendLayout();
 
            dataGridView1.Columns.Add(Column1);
            dataGridView1.Columns.Add(Column2);
            dataGridView1.Dock = DockStyle.Fill; 

            this.Controls.Add(dataGridView1); 
            ((System.ComponentModel.ISupportInitialize)(dataGridView1)).EndInit();
            this.ResumeLayout(false); 

效果圖: