C#如何在DataGridViewCell中自定义脚本编辑器

　　上一篇博文探讨了如何自定义DataGridViewColumn实现一个TreeViewColumn来在DataGridView控件中显示TreeView控件，其实我们还可以继续发挥想象，自定义其他的列类型，下面介绍一个脚本编辑器列类型，我这里取名ScriptTextEditorColumn，当用户单击DataGridView的ScriptTextEditorColumn时，单元格右边会出现一个按钮，单击按钮会弹出一个脚本编辑器窗体，用户可以在窗体中进行代码维护，然后回写到单元格中。

　　用人会问，这个控件有啥实际作用，其实结合动态编译的技术，在datagridview中进行取值公式的模板设定，也就是在对应的单元格中设置C#脚本，然后动态执行后呈现结果到一个datagridview单元格中，这样就实现了动态配置datagridview后台计算逻辑的目的，当然实现这样的功能还需要大量的工作，但是主要的思路就是这样。

1 ScriptTextEditorColumn

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace Host_Controls_in_Windows_Forms_DataGridView_Cells
 {
    public class ScriptTextEditorColumn : DataGridViewColumn
     {
        public ScriptTextEditorColumn()
            : base(new ScriptTextEditorCell())
         {
         }

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

     //----------------------------------------------------------------------
     public class  ScriptTextEditorCell : DataGridViewTextBoxCell
     {

         public ScriptTextEditorCell()
             : base()
         {

         }

         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);
             ScriptTextEditingControl ctl =
                 DataGridView.EditingControl as ScriptTextEditingControl;
             // Use the default row value when Value property is null.
             if (this.Value == null)
             {
                 ctl.textBox1.Text = (String)this.DefaultNewRowValue;
             }
             else
             {
                 ctl.textBox1.Text = (String)this.Value;
             }
         }

         public override Type EditType
         {
             get
             {
                 // Return the type of the editing control that CalendarCell uses.
                 return typeof(ScriptTextEditingControl);
             }
         }

         public override Type ValueType
         {
             get
             {
                 // Return the type of the value that CalendarCell contains.

                 return typeof(String);
             }
         }

         public override object DefaultNewRowValue
         {
             get
             {
                 // Use the current date and time as the default value.
                 string code = @"
 #region
 //jackwangcumt
 #endregion
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Drawing;
 using System.Data;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 namespace Host_Controls_in_Windows_Forms_DataGridView_Cells
 {
     public partial class SourceTextBox : UserControl
     {
         public SourceTextBox()
         {
             InitializeComponent();
             this.textBox1.Location = this.Location;
             this.textBox1.Width = this.Width;
             this.textBox1.Height = this.Height;
         }
         protected void OnValueChanged(string text)
         {
             this.textBox1.Text = text;
         }

         private void btnSource_Click(object sender, EventArgs e)
         {
             ScriptEditor frm = new ScriptEditor(this.textBox1.Text);
             frm.ShowDialog();
             this.textBox1.Text = frm.fastColoredTextBox1.Text;
         }
     }
 }
                 ";
                 return code;
             }
         }
     }
     //-----------------------------------------------------------------

     class ScriptTextEditingControl : SourceTextBox, IDataGridViewEditingControl
     {
         DataGridView dataGridView;
         private bool valueChanged = false;
         int rowIndex;

         public ScriptTextEditingControl()
         {
             //文本变更更新到cell
             this.textBox1.TextChanged += new EventHandler(textBox1_TextChanged);
         }

         void textBox1_TextChanged(object sender, EventArgs e)
         {
             // Notify the DataGridView that the contents of the cell
             // have changed.
             valueChanged = true;
             this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
             //调用SourceTextBox的OnValueChanged(string Text)
             base.OnValueChanged(this.textBox1.Text);
         }

         // Implements the IDataGridViewEditingControl.EditingControlFormattedValue
         // property.
         public object EditingControlFormattedValue
         {
             get
             {
                 return this.textBox1.Text;
             }
             set
             {
                 if (value is String)
                 {
                     try
                     {
                         // This will throw an exception of the string is
                         // null, empty, or not in the format of a date.
                        this.textBox1.Text=((String)value);
                     }
                     catch
                     {
                         // In the case of an exception, just use the
                         // default value so we're not left with a null
                         // value.
                         this.textBox1.Text = "jackwangcumt>>error";
                     }
                 }
             }
         }

         // 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 listed.
             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 !dataGridViewWantsInputKey;
             }
         }

         // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
         // method.
         public void PrepareEditingControlForEdit(bool selectAll)
         {
             // No preparation needs to be done.
         }

         // 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 OnTextChanged(EventArgs e)
         {
             // Notify the DataGridView that the contents of the cell
             // have changed.
             valueChanged = true;
             this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
             base.OnTextChanged(e);

         }

     }

 }

2 SourceTextBox

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Drawing;
 using System.Data;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace Host_Controls_in_Windows_Forms_DataGridView_Cells
 {
     public partial class SourceTextBox : UserControl
     {
         public SourceTextBox()
         {
             InitializeComponent();
             this.textBox1.Location = this.Location;
             this.textBox1.Width = this.Width;
             this.textBox1.Height = this.Height;
         }
         protected void OnValueChanged(string text)
         {
             this.textBox1.Text = text;
         }

         private void btnSource_Click(object sender, EventArgs e)
         {
             ScriptEditor frm = new ScriptEditor(this.textBox1.Text);
             frm.ShowDialog();
             this.textBox1.Text = frm.fastColoredTextBox1.Text;
         }
     }
 }

 namespace Host_Controls_in_Windows_Forms_DataGridView_Cells
 {
     partial class SourceTextBox
     {
         /// <summary>
         /// 必需的设计器变量。
         /// </summary>
         private System.ComponentModel.IContainer components = null;

         /// <summary>
         /// 清理所有正在使用的资源。
         /// </summary>
         /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
         protected override void Dispose(bool disposing)
         {
             if (disposing && (components != null))
             {
                 components.Dispose();
             }
             base.Dispose(disposing);
         }

         #region 组件设计器生成的代码

         /// <summary>
         /// 设计器支持所需的方法 - 不要
         /// 使用代码编辑器修改此方法的内容。
         /// </summary>
         private void InitializeComponent()
         {
             this.textBox1 = new System.Windows.Forms.TextBox();
             this.btnSource = new System.Windows.Forms.Button();
             this.SuspendLayout();
             //
             // textBox1
             //
             this.textBox1.BorderStyle = System.Windows.Forms.BorderStyle.None;
             this.textBox1.Location = new System.Drawing.Point(, );
             this.textBox1.Margin = new System.Windows.Forms.Padding();
             this.textBox1.Multiline = true;
             this.textBox1.Name = "textBox1";
             this.textBox1.Size = new System.Drawing.Size(, );
             this.textBox1.TabIndex = ;
             //
             // btnSource
             //
             this.btnSource.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                         | System.Windows.Forms.AnchorStyles.Right)));
             this.btnSource.BackColor = System.Drawing.Color.Transparent;
             this.btnSource.BackgroundImage = global::Host_Controls_in_Windows_Forms_DataGridView_Cells.Resource.setting;
             this.btnSource.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Zoom;
             this.btnSource.FlatAppearance.BorderColor = System.Drawing.Color.White;
             this.btnSource.FlatAppearance.BorderSize = ;
             this.btnSource.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
             this.btnSource.Font = new System.Drawing.Font("新宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)()));
             this.btnSource.Location = new System.Drawing.Point(, -);
             this.btnSource.Margin = new System.Windows.Forms.Padding();
             this.btnSource.Name = "btnSource";
             this.btnSource.Size = new System.Drawing.Size(, );
             this.btnSource.TabIndex = ;
             this.btnSource.UseVisualStyleBackColor = false;
             this.btnSource.Click += new System.EventHandler(this.btnSource_Click);
             //
             // SourceTextBox
             //
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.Controls.Add(this.btnSource);
             this.Controls.Add(this.textBox1);
             this.Margin = new System.Windows.Forms.Padding();
             this.Name = "SourceTextBox";
             this.Size = new System.Drawing.Size(, );
             this.ResumeLayout(false);
             this.PerformLayout();

         }

         #endregion

         public System.Windows.Forms.Button btnSource;
         public System.Windows.Forms.TextBox textBox1;
     }
 }

3 效果