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(3, 3);
this.textBox1.Margin = new System.Windows.Forms.Padding(4);
this.textBox1.Multiline = true;
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(175, 21);
this.textBox1.TabIndex = 1;
//
// 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 = 0;
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)(134)));
this.btnSource.Location = new System.Drawing.Point(159, -1);
this.btnSource.Margin = new System.Windows.Forms.Padding(0);
this.btnSource.Name = "btnSource";
this.btnSource.Size = new System.Drawing.Size(19, 25);
this.btnSource.TabIndex = 0;
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(0);
this.Name = "SourceTextBox";
this.Size = new System.Drawing.Size(178, 26);
this.ResumeLayout(false);
this.PerformLayout();

}

#endregion

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

View Code

3 效果