C#TextBox⽂本居中可设置Margin
原⽣的TextBox不⽀持⽂本的垂直居中及Padding功能，今天晚上抽时间搞了⼀下，此代码主要为增加这些功能。与⼤家共享。using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
namespace TextBoxEx
{
public partial class TextBoxEx : TextBox
{
//设置Rect消息
private const int EM_SETRECT = 179;
//获取Rect消息
private const int EM_GETRECT = 178;
//private const int WM_GETTEXT = 0x000d;
//private const int WM_COPY = 0x0301;
//粘贴消息
private const int WM_PASTE = 0x0302;
/
/绘制消息
private const int WM_PAINT = 0xF;
//控件颜⾊编辑消息
private const int WM_CTLCOLOREDIT = 0x0133;
//private const int WM_CONTEXTMENU = 0x007B;
//private const int WM_RBUTTONDOWN = 0x0204;
public TextBoxEx()
{
InitializeComponent();
//this.SetStyle(ControlStyles.UserPaint
//    | ControlStyles.DoubleBuffer
/
/    | ControlStyles.ResizeRedraw  //调整⼤⼩时重绘
//    | ControlStyles.AllPaintingInWmPaint // 禁⽌擦除背景.
//    | ControlStyles.OptimizedDoubleBuffer // 双缓冲
//    | ControlStyles.SupportsTransparentBackColor //透明效果
//    , true);
//多⾏显⽰只有多⾏显⽰才能设置Rect有效
this.Multiline = true;
//不允许回国
AllowReturn = false;
//关闭默认的边框
BorderStyle = System.Windows.Forms.BorderStyle.None;
/
/禁⽌折⾏
WordWrap = false;
_textMargin = new Padding(1);
}
protected override void OnResize(EventArgs e)
{
base.OnResize(e);
SetTextDispLayout();
}
protected override void OnTextAlignChanged(EventArgs e)
{
base.OnTextAlignChanged(e);
SetTextDispLayout();
}
protected override void OnKeyPress(KeyPressEventArgs e)
{
//如果不允许回车屏蔽回车换⾏键值
if (!AllowReturn
&& ((int)e.KeyChar == (int)Keys.Return || (int)e.KeyChar == (int)Keys.LineFeed))
{
e.Handled = true;
}
base.OnKeyPress(e);
}
/// <summary>
/// 绘制消息进⾏绘制边框
/// </summary>
/// <param name="m"></param>
private void WmPaint(ref System.Windows.Forms.Message m)
{
if (ClientRectangle.Width > 0 && ClientRectangle.Height > 0)
{
Rectangle clientRect = this.ClientRectangle;
Color lineColor = borderRenderStyle.LineColor;
if (Focused)
lineColor = borderRenderStyle.ActiveLineColor;
using (Graphics g = this.CreateGraphics())
{
if (clientRect.Width > 0 && clientRect.Height > 0)
{
using (Pen pen = new Pen(lineColor, borderRenderStyle.LineWidth))
{
pen.DashStyle = borderRenderStyle.LineDashStyle;
if (borderRenderStyle.ShowLeftLine)
{
g.DrawLine(pen, clientRect.Location, new Point(clientRect.Left, clientRect.Bottom));
}
if (borderRenderStyle.ShowTopLine)
{
g.DrawLine(pen, clientRect.Location, new Point(clientRect.Right, clientRect.Top));
}
if (borderRenderStyle.ShowRightLine)
{
g.DrawLine(pen, new Point(clientRect.Right - 1, clientRect.Top), new Point(clientRect.Right - 1, clientRect.Bottom));                            }
if (borderRenderStyle.ShowBottomLine)
{
g.DrawLine(pen, new Point(clientRect.Left, clientRect.Bottom - 1), new Point(clientRect.Right, clientRect.Bottom - 1));                            }
}
}
}
}
}
/// <summary>
/// 窗体处理消息主函数处理粘贴及绘制消息
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref System.Windows.Forms.Message m)
{
string str = "";
bool flag = false;
int i = 0;
if (m.Msg == 0x0204)
i++;
if (!AllowReturn
&& m.Msg == WM_PASTE
&& System.Windows.Forms.Clipboard.ContainsText())
{
borderboxstr = System.Windows.Forms.Clipboard.GetText();
System.Windows.Forms.Clipboard.Clear();
string nstr = str.Replace(char.ConvertFromUtf32((int)Keys.Return), "").Replace(char.ConvertFromUtf32((int)Keys.LineFeed), "");                System.Windows.Forms.Clipboard.SetText(nstr);
if (str.Length > 0) flag = true;
}
base.WndProc(ref m);
if (flag)
{
flag = false;
System.Windows.Forms.Clipboard.SetText(str);
str = "";
}
if (m.Msg == WM_PAINT || m.Msg == WM_CTLCOLOREDIT)
{
WmPaint(ref m);
}
}
[DllImport("user32.dll", EntryPoint = "SendMessageA")]
private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, string lParam);
[DllImport("user32.dll", EntryPoint = "SendMessageA")]
private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, ref Rectangle lParam);
/
// <summary>
/// 尺⼨变化时重新设置字体的显⽰位置居中
/// </summary>
/// <param name="e"></param>
protected override void OnSizeChanged(EventArgs e)
{
base.OnSizeChanged(e);
SetTextDispLayout();
}
/// <summary>
/// 设置⽂本显⽰布局位置
/
// </summary>
public void SetTextDispLayout()
{
if (Text == "")
return;
Rectangle rect = new Rectangle();
SendMessage(this.Handle, EM_GETRECT, (IntPtr)0, ref rect);
SizeF size = CreateGraphics().MeasureString(Text, Font);
rect.Y = (int)(Height - size.Height) / 2 + TextMargin.Top;
rect.X = 1 + TextMargin.Left;
rect.Height = Height - 2;
rect.Width = Width - TextMargin.Right - TextMargin.Left - 2;
SendMessage(this.Handle, EM_SETRECT, IntPtr.Zero, ref rect);
}
/// <summary>
/// 边框样式
/// </summary>
/// <remarks>获取或设置边框样式.</remarks>
[Category("Appearance"),
Description("边框样式"),
DefaultValue(null)]
public virtual TTextBoxBorderRenderStyle BorderRenderStyle
{
get { return borderRenderStyle; }
set { borderRenderStyle = value; }
}
private TTextBoxBorderRenderStyle borderRenderStyle = new TTextBoxBorderRenderStyle();
/// <summary>
/// 是否允许有回车
/// </summary>
public bool AllowReturn { get; set; }
protected override void OnTextChanged(EventArgs e)
{
base.OnTextChanged(e);
SetTextDispLayout();
}
private Padding _textMargin;
/// <summary>
/// Text Padding值
/// </summary>
public Padding TextMargin { get { return _textMargin; } set { _textMargin = value; SetTextDispLayout(); } }    }
[TypeConverter(typeof(ExpandableObjectConverter))]
public class TTextBoxBorderRenderStyle
{
/// <summary>
/// 边线颜⾊
/// </summary>
/// <remarks>获取或设置边线颜⾊</remarks>
[Category("Appearance"),
Description("获取或设置边线颜⾊"),
DefaultValue(typeof(Color), "Gray")]
public virtual Color LineColor
{
get { return gridLineColor; }
set { gridLineColor = value; }
}
private Color gridLineColor = Color.LightGray;
/// <summary>
/// 激活状态时的边线颜⾊
/// </summary>
/// <remarks>获取或设置激活状态时的边线颜⾊.</remarks>
[Category("Appearance"),
Description("激活状态时的边线颜⾊"),
DefaultValue(typeof(Color), "RoyalBlue")]
public virtual Color ActiveLineColor
{
get { return activeGridLineColor; }
set { activeGridLineColor = value; }
}
private Color activeGridLineColor = Color.RoyalBlue;
[Category("Appearance"),
Description("线宽度"),
DefaultValue(1)]
public virtual float LineWidth
{
get { return lineWidth; }
set { lineWidth = value; }
}
private float lineWidth = 1;
/// <summary>
///线样式
/// </summary>
/// <remarks>获取或设置线样式.</remarks>
[Category("Appearance"),
Description("获取或设置线样式"),
DefaultValue(typeof(DashStyle), "Solid")]
public virtual DashStyle LineDashStyle
{
get { return lineDashStyle; }
set { lineDashStyle = value; }
}
private DashStyle lineDashStyle = DashStyle.Solid;        /// <summary>
/// 左边线是否显⽰
/// </summary>
/// <remarks>获取或设置左线是否显⽰.</remarks>        [Category("Appearance"),
Description("左边⽹格线是否显⽰"),
DefaultValue(true)
]
public virtual bool ShowLeftLine
{
get { return showLeftLine; }
set { showLeftLine = value; }
}
private bool showLeftLine = true;
/// <summary>
/// 上边线是否显⽰
/// </summary>
/// <remarks>获取或设置上边线是否显⽰.</remarks>        [Category("Appearance"),
Description("上边线是否显⽰"),
DefaultValue(true)
]
public virtual bool ShowTopLine
{
get { return showTopLine; }
set { showTopLine = value; }
}
private bool showTopLine = true;
/// <summary>
/// 右边线是否显⽰
/// </summary>
/// <remarks>获取或设置右边线是否显⽰.</remarks>        [Category("Appearance"),
Description("右边线是否显⽰"),
DefaultValue(true)
]
public virtual bool ShowRightLine
{
get { return showRightLine; }
set { showRightLine = value; }
}
private bool showRightLine = true;
/// <summary>
/// 底边线是否显
/// </summary>
/
// <remarks>获取或设置底边线是否显⽰.</remarks>        [Category("Appearance"),
Description("底边线是否显⽰"),
DefaultValue(true)
]
public virtual bool ShowBottomLine
{
get { return showBottomLine; }
set { showBottomLine = value; }
}

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