C# for MFC programmers Quick Equivalents Map

This list is by no means intended to be comprehensive. I am learning C#, and as I've had to look something up, I record it here. I figure if I had to look it up, you will, too. If you have entries to contribute based on your own experience, or if you discover an error caused by my own naiveté in C#, feel free to send them. I won't attribute each individual contributions, but I will add you to a "contributions by..." section at the end. If you want your email or your Web site included in the attributions list, please say so explicitly; otherwise I will just put your name there. Or, if you want to remain anonymous, tell me and I will hog all the credit myself.

Useful Web Sites

I've discovered a number of useful Web sites for beginning C# programmers. Included in no particular order,

http://www.syncfusion.com/FAQ/winforms/default.asp

http://www.syncfusion.com/faq/winforms/627.asp (owner-drawn ListBox)

http://www.wintoolzone.com/dotnetcom.aspx

My FAQ

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

C/MFC concept				C#
A
abs				Math.Abs
	int n = ...; int a = abs(n);				int n = ...; int a = Math.Abs(n);
	int n = -2147483648; // largest negative # UINT u = abs(n); // n = 2147483648				int n = -2147483648; uint u = Math.Abs(n); // exception! but the following works! uint u = unchecked(n <>
.AddString(...) (CListBox)				.Items.Add(...) (CListBox)
AfxMessageBox				MessageBox.Show
	UINT n = AfxMessageBox(body, flags);				DialogResult n = MessageBox.Show(body, caption, flags, icon);
					See MessageBox
atoi				Parse
	CString s; int n = atoi(s);				String s int n = int.Parse(s)
atol				Parse
	CString s; long n = atol(s);				String s long n = long.Parse(s)

B
BOOL				Boolean bool
bool				Boolean bool

BS_PUSHLIKE				Drag a check box onto the form. Select its Appearance property as Button




BYTE				byte
C
CBitmap				Bitmap (actually, a GDI+ bitmap)
CBrush				Brush
CDC				Graphics
CClientDC				Graphics
	CClientDC dc(&c_Ctl)				Graphics g = c_Ctl.CreateGraphics();
ceil				Math.Ceiling
CenterWindow (CWnd)				.StartPosition = FormStartPosition.CenterParent (can be set at design time)
CFileDialog				Create an object (usually in the forms design template) of type SaveFileDialog or OpenFileDialog. Use the ShowDialog method to invoke it.
CFont				Font
char (as a character type)				char
					Note however that char in C# means Unicode character and is not the same as byte or the concept in C/C++ known as char. Signedness is not a characteristic of the C# char type. It is conceptually closer to the C/C++ WCHAR type.
char (as a signed 8-bit integer)				sbyte
CListBox::AddString(...) (CListBox)				CListBox.Items.Add(...) (CListBox)
CListBox.GetLBText(n) (CListBox)				CListBox.GetItemText(n)
COLOR_ constants				See GetSysColor
COLORREF				Color
	COLORREF r = RGB(255,128,0);				Color c = Color.FromArgb(255,128,0);
	This actually oversimplifies, or over complicates, the problem. C# contains a number of "predefined color names", many with really obscure names and no good graphical representation in the Help system of what they look like. However, RGB(255,0,0) is the name .Red. The names appear to conform to the HTML naming conventions. You can also name system colors. See GetSysColor.				Argb stands for the 4-tuple, Alpha, Red, Green, Blue, and the overload with three arguments assumes Alpha (transparency) is 255 (completely opaque).
	COLORREF r = RGB(255,0,0)				Color c = Color.Red;
CPaintDC				The .Graphics member of the System.Windows.Forms.PaintEventArgs argument to the OnPaint event
CPen				Pen

CSize				Size (integer values) SizeF (floating point values)
	CSize sz = ...; int w = sz.cx; int h = sz.cy;				SizeF sz = ...; int w = sz.Width; int h = sz.Height;
					This is an oversimplification because the fields of a SizeF are floats and not integers!
CSpinCtrl (with CEdit buddy control)				NumericUpDown
CString				String
CString::Find(CString s)				String.IndexOf(String s)
CString::Format				Format
	CString s; s.Format(fmt, val...)				String s; s = Format(fmt, val...)
				Formatting specifications in C# are much more flexible than in traditional C. For example, you can associate several format requests with the same argument, and the formatting options are richer, including localized date, time, and currency representations. Instead of %, the format specifiers in C# are enclosed in {}, and are of the form {n:Fp} where n specifies the argument in the formatting string (the n: can be omitted in the ToString method call), F is a format specifier, and p is the precision.
	%d			{n:d} or {n:D}
	%02d			{n:d2} or {n:D2}
	%o			octal is not supported
	%ld			{n:d} No special handling is required for int values
	%I64d			{n:d} No special handling is required for 64-bit int values
	%x			{n:x}
	%X			{n:X}
CWnd::GetClientRect()				ClientRectangle (property)
CWnd::Invalidate()				.Invalidate()
CWnd::InvalidateRect(&r)				.Invalidate(...);
CWnd::ShowWindow(SW_SHOW)				.Visible = true;
CWnd::ShowWindow(SW_HIDE);				.Visible = false;

CString.GetLength();				String.Length;
D
DeleteDC				No need to; implicitly handled by the Graphics destructor during garbage collection.
DestroyWindow				Close
DoModal				.ShowDialog
double				double
DrawItem (CListBox)				DrawItem event See http://www.syncfusion.com/faq/winforms/627.asp
DWORD				uint
E
.Ellipse				.DrawEllipse
	CClientDC dc(&wnd); CRect r; CPen pen(PS_SOLID, n, RGB(0,0,0)); dc.SelectObject(&pen); dc.Ellipse(&r);				Graphics g = wnd.CreateGraphics(); Rectangle r; Pen pen = new Pen(Color.Black, n); g.DrawEllipse(pen, r);
EndDialog(IDCancel)				Close
EndDialog(IDOK)				Close
exp				Math.Exp
F

.Find (CString)				.IndexOf (String)

float				float
.Format				see CString::Format
G
GetBValue				.B
	COLORREF c = ...; int b = GetBValue(c);				Color c = ...; int b = c.B;
.GetClientRect()				.ClientRectangle (property)
	CRect r; wnd.GetClientRect(&r);				Rectangle r = wnd.ClientRectangle;
GetCurSel (CComboBox)				... = ComboBox.SelectedIndex;
GetDC				Graphics
	CDC * dc = wnd.GetDC();				Graphics g = wnd.CreateGraphics();
GetFont				.Font
	CFont * f = wnd.GetFont();				Font f = wnd.Font;
GetGValue				.G
	COLORREF c = ...; int g = GetGValue(c);				Color c = ...; int g = c.G;
.GetLBText(n) (CListBox)				.GetItemText(n)
.GetLBText(n) (CComboBox)				.GetSelectedItem.ToString();
.GetLength() (CString)				s.Length
.GetMiterLimit (CDC)				... = Pen.MiterLimit;
GetModuleFileName				System.Windows.Forms.Application.ExecutablePath
	TCHAR name[MAX_PATH]; GetModuleFileName(NULL, name, MAX_PATH);				String name = System.Windows.Forms. Application.ExecutablePath;
GetPos (CSpinCtrl)				NumericUpDown.Value Note that the values of .Minimum, .Maximum, and .Value are of type decimal. This means that to assign a value which is a fractional value, you have to use a decimal constant. To use the values, you may have to cast them from decimal to int or float.
GetRange (CSpinCtrl)				NumericUpDown.Maximum and NumericUpDown.Minimum Note that the values of .Minimum, .Maximum, and .Value are of type decimal. This means that to assign a value which is a fractional value, you have to use a decimal constant. To use the values, you may have to cast them from decimal to int or float.
GetRValue				.R
	COLORREF c = ...; int r = GetRValue(c);				Color c = ...; int r = c.R;
.GetSize() (CArray)				s.Length
GetSysColor				Color.FromKnownColor(KnownColor.colorname)
	COLORREF c = ::GetSysColor(COLOR_WINDOW)				Color.KnownColor.Window
	COLOR_3DDKSHADOW				Color.KnownColor.ControlDarkDark (?)
	COLOR_3DFACE				Color.KnownColor.Control (?)
	COLOR_3DHIGHLIGHT				Color.KnownColor.ControlLight (?)
	COLOR_3DHILIGHT				Color.KnownColor.ControlLight (?)
	COLOR_3DLIGHT				Color.KnownColor.?
	COLOR_ACTIVEBORDER				Color.KnownColor.ActiveBorder
	COLOR_ACTIVECAPTION				Color.KnownColor.ActiveCaption
	COLOR_APPWORKSPACE				Color.KnownColor.AppWorkspace
	COLOR_BACKGROUND				Color.KnownColor.Desktop
	COLOR_BTNFACE				Color.KnownColor.Control (?)
	COLOR_BTNHIGHLIGHT				Color.KnownColor.ControlLight (?)
	COLOR_BTNHILIGHT				Color.KnownColor.ControlLight (?)
	COLOR_BTNSHADOW				Color.KnownColor.ControlDark (?)
	COLOR_BTNTEXT				Color.KnownColor.ControlText
	COLOR_CAPTIONTEXT
	COLOR_DESKTOP				Color.KnownColor.Desktop
	COLOR_GRADIENTACTIVECAPTION
	COLOR_GRADIENTINACTIVECAPTION
	COLOR_GRAYTEXT				Color.KnownColor.GrayText
	COLOR_HIGHLIGHT				Color.KnownColor.Highlight
	COLOR_HIGHLIGHTTEXT				Color.KnownColor.HighlightText
	COLOR_HOTLIGHT				Color.KnownColor.HotTrack (?)
	COLOR_INACTIVEBORDER				Color.KnownColor.InactiveBorder
	COLOR_INACTIVECAPTION				Color.KnownColor.InactiveCaption
	COLOR_INACTIVECAPTIONTEXT				Color.KnownColor.InactiveCaptionText
	COLOR_INFOBK
	COLOR_INFOTEXT				Color.KnownColor.InfoText
	COLOR_MENU				Color.KnownColor.Menu
	COLOR_MENUTEXT				Color.KnownColor.MenuText
	COLOR_SCROLLBAR				Color.KnownColor.ScrollBar
	COLOR_WINDOW				Color.KnownColor.Window
	COLOR_WINDOWFRAME				Color.KnownColor.WindowFrame
	COLOR_WINDOWTEXT				Color.KnownColor.WindowText
GetSystemMetrics				System.Windows.Forms.SystemInformation
GetTextExtent				MeasureString
	CClientDC dc(&wnd); CSize sz; CString s = ...; sz = dc.GetTextExtent(s);				Graphics g = wnd.CreateGraphics(); SizeF sz; String s = ...; sz = g.MeasureString(wnd.Font, s);
GetTickCount				DateTime.Now.Ticks
GetUserName				System.Environment.UserName
GWL_DLGRESULT				Closing event, DialogResult property
	void CMyDialog::OK() { DWORD result = ...; SetWindowLong((HWND)this, GWL_DLGRESULT, result); CDialog::OnOK(); }				select the Closing event for the form and type a name of the function you want, such as OnClosing private void OnClosing( Object sender, System.ComponentModel.CancelEventArgs e) { Object result = ...; e.DialogResult = result; }
H
HBITMAP				Bitmap (actually, a GDI+ bitmap)
HBRUSH				Brush
HDC				Graphics (see CDC)
HPEN				Pen
I
_I64_MAX				Int64.MaxValue
_I64_MIN				Int64.MinValue
int				int
__int64				long
INT_MAX				Int32.MaxValue
INT_MIN				Int32.MinValue
.Invalidate()				.Invalidate();
.InvalidateRect				.Invalidate();
	CRect r; wnd.InvalidateRect(&r)				Rectangle r; wnd.Invalidate(r);
itoa				ToString
%d	3				int v; String s; s = i.ToString();
%3d	··3 (leading spaces)				int v; String s; s = String.Format("{0,3:d}", v);
%03d	003				int v = 3; String s; s = i.ToString("D3");
%03d	003				int v = 3; String s; s = i.ToString("000");
K
KillTimer				place a timer object on the form and give it a name timer.Stop();
L

LineTo				DrawLine
	CClientDC dc(&wnd); dc.SelectObject(&pen); dc.MoveTo( x0, y0); dc.LineTo( x1, y1);				Graphics g = wnd.CreateGraphics(); g.DrawLine(pen, x0, y0, x1, y1);
	CClientDC dc(&wnd); dc.SelectObject(&pen); CPoint p0(x0, y0); CPoint p1(x1, y1); dc.MoveTo( p0 ); dc.LineTo( p1 );				Graphics g = wnd.CreateGraphics(); Point p0 = new Point(x0, y0); Point p1 = new Point(x1, y1); g.DrawLine(pen, p0, p1);
::LoadCursor(NULL, cursorid) LoadStandardCursor(cursorid) (CWinApp)				No equivalent. See OnSetCursor
long				int
LONG				int
LONGLONG				long
M
MessageBox				MessageBox.Show
	UINT n = MessageBox(body, caption, flags);				DialogResult n = MessageBox.Show(body); DialogResult n = MessageBox.Show(body, caption); DialogResult n = MessageBox.Show(body, caption, buttons); DialogResult n = MessageBox.Show(body, caption, buttons, icon); DialogResult n = MessageBox.Show(body, caption, buttons, icon, defaultbutton);
	buttons can be any of the following:
	MB_ABORTRETRYIGNORE				MessageBoxButtons.AbortRetryIgnore
	MB_HELP				no equivalent
	MB_OK				MessageBoxButtons.OK
	MB_OKCANCEL				MessageBoxButtons.OKCancel
	MB_OKRETRY				MessageBoxButtons.OKRetry
	MB_YESNO				MessageBoxButtons.YesNo
	MB_YESNOCANCEL				MessageBoxButtons.YesNoCancel
	icon is optional and can be any of
	MB_ASTERISK				MessageBoxIcon.Asterisk Note: this code should be considered obsolete; .Information* should be used instead*
	MB_ERROR				MessageBoxIcon.Error
	MB_EXCLAMATION				MessageBoxIcon.Exclamation Note: this code should be considered obsolete; .Warning* should be used instead*
	MB_HAND				MessageBoxIcon.Hand Note: this code should be considered obsolete; .Error* should be used instead*
	MB_INFORMATION				MessageBoxIcon.Information
					MessageBoxIcon.None
	MB_ICONQUESTION				MessageBoxIcon.Question
	MB_ICONSTOP				MessageBoxIcon.Stop Note: this code should be considered obsolete; .Error* should be used instead*
	MB_ICONWARNING				MessageBoxIcon.Warning
	MB_USERICON				no equivalent
			The default button can be one of the following
	MB_DEFBUTTON1				MessageBoxDefaultButton.Button1
	MB_DEFBUTTON2				MessageBoxDefaultButton.Button2
	MB_DEFBUTTON3				MessageBoxDefaultButton.Button3
	MB_DEFBUTTON4				no equivalent
		The return value can be one of the following
	IDABORT				DialogResult.Abort
	IDCANCEL				DialogResult.Cancel
	IDIGNORE				DialogResult.Ignore
	IDNO				DialogResult.No
	There is no equivalent to this value in the standard API				DialogResult.None
	IDOK				DialogResult.OK
	IDRETRY				DialogResult.Retry
	IDYES				DialogResult.Yes
MoveTo				DrawLine
	CClientDC dc(&wnd); dc.SelectObject(&pen); dc.MoveTo( x0, y0); dc.LineTo( x1, y1);				Graphics g = wnd.CreateGraphics(); g.DrawLine(pen, x0, y0, x1, y1);
	CClientDC dc(&wnd); CPoint p0(x0, y0); CPoint p1(x1, y1); dc.SelectObject(&pen); dc.MoveTo( p0 ); dc.LineTo( p1 );				Graphics g = wnd.CreateGraphics(); Point p0 = new Point(x0, y0); Point p1 = new Point(x1, y1); g.DrawLine(pen, p0, p1);
MoveWindow				.Location (changes only the top-left origin)
	// Move window to X, Y retaining size CRect r; ctl.GetWindowRect(&r); CSize sz(r.Width(), r.Height()); ctl.MoveWindow(X, Y, sz.cx, sz.cy);				ctl.Location = new Point(X, Y); Note that accessing the .Location* member returns a copy of the Point value, so changing the values in this will not change the size in the control itself, e.g.,* ctl.Location.x = X; // does not work changes only the value in the copy. You must assign a complete Point* object to the .Location member.*
MoveWindow				.Size (changes only the size) .Width (changes only the width) .Height (changes only the height)
	// Change window to size W,H in same place CRect r; ctl.GetWindowRect(&r); ScreenToClient(&r); ctl.MoveWindow(r.left, r.top, W, H);				ctl.Size = new Size(X, Y); or you can change each dimension independently ctl.Width = W; ctl.Height = H; Note that accessing the .Size* member returns a copy of the Size value, so changing the values in this will not change the size in the control itself, e.g.,* ctl.Size.Width = W; // does not work changes only the value in the copy. You must assign a complete Size* object to the .Size member, or assign independently to the .Width or .Height members*
N
NULL				null
O

OnClose				Closing event
	void CMyWnd::OnClose() { if(MyQueryClose()) return; CWnd::OnClose(); }				select the Closing event for the form and type a name of the function you want, such as OnClosing private void OnClosing( Object sender, System.ComponentModel.CancelEventArgs e) { e.Cancel = MyQueryClose(); }
OnDestroy				Closed event
	void CMyWnd::OnDestroy() { ... }				select the Closing event for the form and type a name of the function you want, such as OnClosed private void OnClosing(Object sender, System.ComponentModel.EventArgs e) { ... }
OnVScroll(...)				Create a ScrollEvent handler
	switch(nSBCode)				switch(e.Type)
	SB_PAGEUP				ScrollEventType.LargeDecrement
	SB_PAGEDOWN				ScrollEventType.LargeIncrement
	SB_LINEUP				ScrollEventType.SmallDecrement
	SB_LINEDOWN				ScrollEventType.SmallIncrement
	SB_TOP				ScrollEventType.First
	SB_BOTTOM				ScrollEventType.Last
	SB_THUMBPOSITION				ScrollEventType.ThumbPosition
	SB_THUMBTRACK				ScrollEventType.ThumbTrack
	SB_ENDSCROLL				ScrollEventType.EndPos

OnInitDialog				Load event
OnLButtonDown				MouseDown event
OnLButtonUp				MouseUp event
OnMouseMove				MouseMove event
OnMove				LocationChanged event
OnPaint				OnPaint event
OnSetCursor				No equivalent; cursor is set using the Cursor property of the window whose cursor is to be set. See SetCursor
OnSize				SizeChanged event
P
PostMessage				BeginInvoke
	ON_MESSAGE(UWM_MYMESSAGE, OnMyMessage) LRESULT CMyClass::OnMyMessage( WPARAM, LPARAM) { ... do something return 0; } void CMyClass::DoSomething() { CString * s = new CString(_T("Message")); PostMessage(UWM_MYMESSAGE, (WPARAM)s);				public delegate void MessageHandler(String s); class CMyClass { public void MyHandler(String s) { ... } } public void DoSomething() { String s = "Message"; MessageHandler handler = new MessageHandler(MyHandler); handler.BeginInvoke(handler);
					As with many C# equivalences, this is an oversimplification of a far more sophisticated concept. For example, in C# you can actually receive a callback when the message is handled, or wait for the receiving thread to process it.
PostQuitMessage(0)				Close()
pow				Math.Pow
printf				System.Console.Write System.Console.WriteLine
	printf("%s", string);				CString string; System.Console.Write(string);
	printf("%s\n", string);				CString string; System.Console.Write(string +"\n");
					CString string; System.Console.WriteLine(string);
puts				System.Console.Write System.Console.WriteLine
	CString string; puts(string);				CString string; System.Console.Write(string);
R
.Rectangle				.DrawRectangle
	CClientDC dc(&wnd); CRect r; ...assign to r dc.SelectObject(&pen); dc.SelectStockObject(HOLLOW_BRUSH); dc.Rectangle(&r);				Graphics g = wnd.CreateGraphics(); Rectangle r; ...assign to r g.DrawRectangle(pen, r);
ReleaseDC				No need to; implicitly handled by the Graphics* destructor during garbage collection.*
.ResetContent				listbox.Items.Clear()
.RestoreDC (CDC)				.Restore (graphics)
	CClientDC dc(&wnd); int n = dc.SaveDC(); ... dc.RestoreDC(n);				Graphics g = wnd.CreateGraphics(); GraphicsState gs = g.Save(); ... g.Restore(gs);
.ReverseFind (CString)				.LastIndexOf
RGB				.FromArgb
	COLORREF r = RGB(255,128,0);				Color c = Color.FromArgb(255,128,0);
	This actually oversimplifies, or over complicates, the problem. C# contains a number of "predefined color names" with really obscure names and no good graphical representation in the Help system of what they look like. The names correspond to the standard names used in HTML. However, as an example, RGB(255,0,0) is the name .Red				Argb stands for the 4-tuple, Alpha, Red, Green, Blue, and the overload with three arguments assumes Alpha (transparency) is 255 (completely opaque).
	COLORREF r = RGB(255,0,0)				Color c = Color.Red; or Color c = Color.FromArgb(255,0,0);
S
.SaveDC (CDC)				.Save (graphics)
	CClientDC dc(&wnd); int n = dc.SaveDC(); ... dc.RestoreDC(n);				Graphics g = wnd.CreateGraphics(); GraphicsState gs = g.Save(); ... g.Restore(gs);
SetCurSel (CComboBox)				ComboBox.SelectedIndex = ...;
::SetCursor(AfxGetApp()->LoadStandardCursor(id));				.Cursor = Cursors.id
	IDC_APPSTARTING				Cursors.AppStarting
	IDC_ARROW				Cursors.Arrow
	IDC_CROSS				Cursors.Cross
	*no equivalent*				Cursors.Default
	IDC_HAND				Cursors.Hand
	IDC_HELP				Cursors.Help
	*no equivalent*				Cursors.HSplit
	IDC_IBEAM				Cursors.IBeam
	IDC_NO				Cursors.No
	*no equivalent*				Cursors.NoMove2D
	*no equivalent*				Cursors.NoMoveHoriz
	*no equivalent*				Cursors.NoMoveVert
	*no equivalent*				Cursors.PanEast
	*no equivalent*				Cursors.PanNE
	*no equivalent*				Cursors.PanNorth
	*no equivalent*				Cursors.PanNW
	*no equivalent*				Cursors.PanSE
	*no equivalent*				Cursors.PanSouth
	*no equivalent*				Cursors.PanSW
	*no equivalent*				Cursors.PanWest
	IDC_SIZEALL				Cursors.SizeAll
	IDC_SIZENESW				Cursors.SizeNESW
	IDC_SIZENS				Cursors.SizeNS
	IDC_SIZESWNE				Cursors.SizeSWNE
	IDC_SIZEWE				Cursors.SizeWE
	IDC_UPARROW				Cursors.UpArrow
	*no equivalent*				Cursors.VSplit
	IDC_WAIT				Cursors.WaitCursor
.SetMapMode (CDC)				.PageScale (Graphics)
	MM_TEXT				GraphicsUnit.Pixel
	MM_LOENGLISH MM_HIENGLISH				GraphicsUnit.Inch
	MM_LOMETRIC MM_HIMETRIC				GraphicsUnit.Millimeter
	MM_TWIPS (¹/₁₄₄₀ inch)				GraphicsUnit.Document (¹/₃₀₀ inch)
	no equivalent				GraphicsUnit.Display (¹/₇₂ inch)
	MM_ISOTROPIC MM_ANISOTROPIC				GraphicsUnit.World (closest approximation)
	no equivalent				GraphicsUnit.Display (¹/₇₅ inch)
.SetMiterLimit (CDC)				Pen.MiterLimit = ...;
.SetPos (CSpinCtrl)				NumericUpDown.Value = ... Note that the values of .Minimum, .Maximum, and .Value are of type decimal. This means that to assign a value which is a fractional value, you have to use a decimal constant. To use the values, you may have to cast them from decimal to int or float.
.SetRange (CSpinCtrl)				NumericUpDown.Maximum = ... NumericUpDown.Minimum = ...; Note that the values of .Minimum, .Maximum, and .Value are of type decimal. This means that to assign a value which is a fractional value, you have to use a decimal constant. To use the values, you may have to cast them from decimal to int or float.
SetTimer				place a timer object on the form and give it a name timer.Interval = ...; // can be set // at design time timer.Start();
.SetViewPortExt/ .SetWindowExt (CDC)				.PageScale (Graphics)
SetWindowPos				.Location (changes only the top-left origin) .Size (changes width and height but not origin) .Width (changes only width) .Height (changes only height)
	// Move window to X, Y retaining size ctl.SetWindowPos(NULL, X, Y, 0, 0, SWP_NOSIZE \| SWP_NOZORDER);				ctl.Location = new Point(X, Y); Note that accessing the .Location* member returns a copy of the Point value, so changing the values in this will not change the size in the control itself, e.g.,* ctl.Location.x = X; // does not work changes only the value in the copy. You must assign a complete Point* object to the .Location member.*
	// Change size to W, H and don't move ctl.SetWindowPos(NULL, 0, 0, W, H, SWP_NOMOVE \| SWP_NOZORDER);				ctl.Size = new Size(W, H); or the values can be set independently ctl.Width = W; ctl.Height = H; Note that accessing the .Size* member returns a copy of the Size value, so changing the values in this will not change the size in the control itself, e.g.,* ctl.Size.Width = W; // does not work changes only the value in the copy. You must assign a complete Size* object to the .Size member, or assign independently to the .Width or .Height members*
ShBrowseForFolder				No good equivalent. KB article 306285 shows how to call the underlying ShBrowseForFolder call in .NET 1.0; in .NET 1.1 there is a FolderBrowserDialog class, but it is not supported in the Common Framework, meaning you can't use it if you expect to run on a Pocket PC. Probably your best bet is to look at the Web site http://www.wintoolzone.com/dotnetcom.aspx where there is an implementation that does not involve the shell API and does not require Common Framework (CF) support.
ShellExecute				System.Diagnostics.Process.Start
SHRT_MAX				Int16.MaxValue
SHRT_MIN				Int16.MinValue
short				short
.ShowWindow(SW_SHOW);				.Visible = true;
.ShowWindow(SW_HIDE);				.Visible = false;
sprintf				ToString
%d	3				int v; String s; s = i.ToString();
%3d	··3 (leading spaces)				No equivalent in C#
%03d	003				int v = 3; String s; s = i.ToString("D3");
%03d	003				int v = 3; String s; s = i.ToString("000");
strcat				+ (applied to String objects)
strcmp				.Equals	String s1; String s2; if(s1.Equals(s))
					note that the comparison operators work also; so you can write if(s1 <> or if(s1 == s2) or if(s1 > s2) as well as !=, <= and >=.
strrchr				LastIndexOf
strstr				.Contains	String s; s = "Permissions"; if(s.Contains("miss")) ... contains the substring
strtol(LPCTSTR, NULL, 16)				int.Parse(String, "x") // throws exception

strtol(LPCTSTR, NULL, 10)				int.Parse(String, "d") // throws exception
strtol(LPCTSTR, NULL, 2)				No equivalent
strtol(LPCTSTR, NULL, 8)				No equivalent

T
_T(...)				Not needed as all strings and characters are implicitly Unicode strings and characters.
U

UINT				uint
ULONG				uint
ULONGLONG				ulong
unsigned				uint
unsigned int				uint
unsigned __int64				ulong
W
WM_CLOSE				Close
	PostMessage(WM_CLOSE)				Close()
WM_DESTROY				Closed event
	void CMyWnd::OnDestroy() { ... }				select the Closing event for the form and type a name of the function you want, such as OnClosed private void OnClosed(Object sender, System.ComponentModel.EventArgs e) { ... }
WM_INITDIALOG				Load event
WM_MOVE				LocationChanged event
WM_SIZE				SizeChanged event
WORD				ushort

Acknowledgements

I didn't discover all of this myself. I asked a lot of questions. Thanks to many contributors, especially those in the microsoft.public.dotnet.languages.csharp and the microsoft.public.dotnet.framework.windowsforms newsgroups. Particular contributors whose information I have used in this table, in alphabetical order, include

Mike Burton

Yan-Hong Huang

Daniel Jebaraj

Gaurav Khanna

Mattias Sjögren

Geert Verkade

Wednesday, June 24, 2009