TextBox，RichTextBox设置行高

/// <summary> /// 设置行距 /// </summary> /// <param name="ctl">控件</param> /// <param name="dyLineSpacing">间距，初始值至少大于(font.size+1)*30</param> public static void SetLineHeight(Control ctl, int dyLineSpacing)
{
PARAFORMAT2 fmt = new PARAFORMAT2();
fmt.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(fmt);
fmt.bLineSpacingRule = 4;// bLineSpacingRule;
fmt.dyLineSpacing = dyLineSpacing;
fmt.dwMask = PFM_LINESPACING;
try
{
SendMessage(new System.Runtime.InteropServices.HandleRef(ctl, ctl.Handle), EM_SETPARAFORMAT, 0, ref fmt);
}
catch
{ }
}
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;
[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
public 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;
[System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.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;
} [System.Runtime.InteropServices.DllImport("user32", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
private static extern IntPtr SendMessage(System.Runtime.InteropServices.HandleRef hWnd, int msg, int wParam, ref PARAFORMAT2 lParam);