Translate Code: Convert of type

Translate Code: Convert of type

• Valdimar

  Thanks, David, is good the code!.
  
  , Well, Code in VB and C#, all traslate a MSIL, for this I wanted to make in one line. I see the MSIL code, is different:
  (it is of my initial code, my first post)
  VB -> MSIL
   IL_0012:  brfalse    IL_00a4
    IL_0017:  ldarg.1
    IL_0018:  castclass  [System.Windows.Forms]System.Windows.Forms.TreeView
    IL_001d:  ldloca.s   _Vb_t_record_0
    IL_001f:  ldarg.2
    IL_0020:  callvirt   instance int32 [System.Windows.Forms]System.Windows.Forms.DragEventArgs::get_X()
    IL_0025:  ldarg.2
    IL_0026:  callvirt   instance int32 [System.Windows.Forms]System.Windows.Forms.DragEventArgs::get_Y()
    IL_002b:  call       instance void [System.Drawing]System.Drawing.Point::.ctor(int32,
                                                                                   int32)
    IL_0030:  nop
    IL_0031:  ldloc.s    _Vb_t_record_0
    IL_0033:  callvirt   instance valuetype [System.Drawing]System.Drawing.Point [System.Windows.Forms]System.Windows.Forms.Control::PointToClient(valuetype [System.Drawing]System.Drawing.Point)
    IL_0038:  stloc.2
    IL_0039:  ldarg.1
  
  C# -> MSIL
  IL_0098
    IL_0016:  ldarg.1
    IL_0017:  ldtoken    [System.Windows.Forms]System.Windows.Forms.TreeView
    IL_001c:  call       class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle)
    IL_0021:  call       object [mscorlib]System.Convert::ChangeType(object,
                                                                     class [mscorlib]System.Type)
    IL_0026:  castclass  [System.Windows.Forms]System.Windows.Forms.TreeView
    IL_002b:  stloc.3
    IL_002c:  ldloc.3
    IL_002d:  ldarg.2
    IL_002e:  callvirt   instance int32 [System.Windows.Forms]System.Windows.Forms.DragEventArgs::get_X()
    IL_0033:  ldarg.2
    IL_0034:  callvirt   instance int32 [System.Windows.Forms]System.Windows.Forms.DragEventArgs::get_Y()
    IL_0039:  newobj     instance void [System.Drawing]System.Drawing.Point::.ctor(int32,
                                                                                   int32)
    IL_003e:  callvirt   instance valuetype [System.Drawing]System.Drawing.Point [System.Windows.Forms]System.Windows.Forms.Control::PointToClient(valuetype [System.Drawing]System.Drawing.Point)
  
  
  

• Lada Sobr

  David with your code, don't appear the follow lines:
  
    IL_0017:  ldtoken    [System.Windows.Forms]System.Windows.Forms.TreeView
    IL_001c:  call       class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle)
    IL_0021:  call       object [mscorlib]System.Convert::ChangeType(object,
                                                                     class [mscorlib]System.Type)
  
  it's was deleted.
  
  

• MiniSong

  Why don't you just do this:
  
  

  pt = ((TreeView)sender).PointToClient(new Point(e.X, e.Y));

  
  
  You don't need the Convert.ChangeType.
  
  
  
  

• Jeff Beranek

  serghio wrote:

  tv = (TreeView)Convert.ChangeType(sender,typeof(TreeView)); pt = tv.PointToClient(new Point(e.X,e.Y));   I can make it, just in a one line

  
  
  Yes, just wrap the whole of the first line in parentheses before adding the meat of the second line.
  
  

  pt = ((TreeView)Convert.ChangeType (sender, typeof(TreeView))).PointToClient (new Point (e.X, e.Y));

  
  
  But why try to crush everything into one line   I think your two lines of code are much more readable.
  
• Translate Code: Convert of type