C# RichTextBox的一些操作：自动换行 设置行间距 调整字体

最近用到richtextbox，一些操作记录在下面：

1 禁止自动换行

  richtextbox1.WordWrap = false;

  wordwrap 属性：指示多行文本控件是否在必要时自动换到下一行的开始处；

2 调整字体大小

  richtextbox.Font = new System.Drawing.Font(FontFamily.GenericMonospace, 10);

3 调整行间距

先写一个类：

class CSetLineSpace    {        public const int WM_USER = 0x0400;        public const int EM_GETPARAFORMAT = WM_USER + 61;        public const int EM_SETPARAFORMAT = WM_USER + 71;        public const long MAX_TAB_STOPS = 32;        public const uint PFM_LINESPACING = 0x00000100;        [StructLayout(LayoutKind.Sequential)]        private struct PARAFORMAT2        {            public int cbSize;            public uint dwMask;            public short wNumbering;            public short wReserved;            public int dxStartIndent;            public int dxRightIndent;            public int dxOffset;            public short wAlignment;            public short cTabCount;            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]            public int[] rgxTabs;            public int dySpaceBefore;            public int dySpaceAfter;            public int dyLineSpacing;            public short sStyle;            public byte bLineSpacingRule;            public byte bOutlineLevel;            public short wShadingWeight;            public short wShadingStyle;            public short wNumberingStart;            public short wNumberingStyle;            public short wNumberingTab;            public short wBorderSpace;            public short wBorderWidth;            public short wBorders;        }        [DllImport("user32", CharSet = CharSet.Auto)]        private static extern IntPtr SendMessage(HandleRef hWnd, int msg, int wParam, ref PARAFORMAT2 lParam);        /// <summary>        /// 设置行距        /// </summary>        /// <param name="ctl">控件</param>        /// <param name="dyLineSpacing">间距</param>        public static void SetLineSpace(Control ctl, int dyLineSpacing)        {            PARAFORMAT2 fmt = new PARAFORMAT2();            fmt.cbSize = Marshal.SizeOf(fmt);            fmt.bLineSpacingRule = 4;// bLineSpacingRule;            fmt.dyLineSpacing = dyLineSpacing;            fmt.dwMask = PFM_LINESPACING;            try            {                SendMessage(new HandleRef(ctl, ctl.Handle), EM_SETPARAFORMAT, 0, ref fmt);            }            catch            {            }        }    }

然后在form_load里调用其方法：

SetLineSpace(richtextbox1, 300);

第三个参考自网上资源，一个博客，但现在找不到出处了，在这里谢谢他吧！