效果预览：
实现步骤如下：
（1）首先在项目上右击选择：添加->新建项，添加自定义控件
（2）自定义的一个Label让它继承LabelControl控件，LabelControl控件是DevExpress控件库里面的一种，和Label控件差不多，想了解更多关于DevExpress控件，推荐到DevExpress控件论坛学习：http://www.dxper.net/
public partial class LabelModule : LabelControl
（3）这个Label需要实现的MouseDown。
private void LabelModule_MouseDown(object sender, MouseEventArgs e)
{
IsMouseDown = true;
MousePrePosition = new Point(e.X, e.Y);
this.BorderStyle = DevExpress.XtraEditors.Controls.BorderStyles.Simple;
this.Cursor = Cursors.SizeAll;
}
（4）MouseUp，也就是鼠标弹起的方法。
private void LabelModule_MouseUp(object sender, MouseEventArgs e)
{
IsMouseDown = false;
this.BorderStyle = DevExpress.XtraEditors.Controls.BorderStyles.Default;
this.Cursor = Cursors.Default;
}
（5）MouseMove，也就是鼠标移动时的方法。
private void LabelModule_MouseMove(object sender, MouseEventArgs e)
{
if (!IsMouseDown) return;
this.Top = this.Top + (e.Y - MousePrePosition.Y);
this.Left = this.Left + (e.X - MousePrePosition.X);
}
完整代码：LabelModule.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraEditors;
namespace IJPrinterSoftware
{
public partial class LabelModule : LabelControl
{
private bool IsMouseDown = false;
private Point MousePrePosition;
private void init()
{
InitializeComponent();
this.MouseDown += new MouseEventHandler(LabelModule_MouseDown);
this.MouseUp += new MouseEventHandler(LabelModule_MouseUp);
this.MouseMove+=new MouseEventHandler(LabelModule_MouseMove);
}
public LabelModule()
{
init();
}
private void LabelModule_MouseDown(object sender, MouseEventArgs e)
{
IsMouseDown = true;
MousePrePosition = new Point(e.X, e.Y);
this.BorderStyle = DevExpress.XtraEditors.Controls.BorderStyles.Simple;
this.Cursor = Cursors.SizeAll;
}
private void LabelModule_MouseUp(object sender, MouseEventArgs e)
{
IsMouseDown = false;
this.BorderStyle = DevExpress.XtraEditors.Controls.BorderStyles.Default;
this.Cursor = Cursors.Default;
}
private void LabelModule_MouseMove(object sender, MouseEventArgs e)
{
if (!IsMouseDown) return;
this.Top = this.Top + (e.Y - MousePrePosition.Y);
this.Left = this.Left + (e.X - MousePrePosition.X);
}
}
}
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