Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / ComponentModel / COM2Interop / COM2IManagedPerPropertyBrowsingHandler.cs / 1305376 / COM2IManagedPerPropertyBrowsingHandler.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms.ComponentModel.Com2Interop { using System.Runtime.InteropServices; using System.ComponentModel; using System.Diagnostics; using System; using System.Reflection; using Microsoft.Win32; using System.Collections; using System.Globalization; [System.Security.SuppressUnmanagedCodeSecurityAttribute()] internal class Com2IManagedPerPropertyBrowsingHandler : Com2ExtendedBrowsingHandler { public override Type Interface { get { return typeof(NativeMethods.IManagedPerPropertyBrowsing); } } public override void SetupPropertyHandlers(Com2PropertyDescriptor[] propDesc) { if (propDesc == null) { return; } for (int i = 0; i < propDesc.Length; i++) { propDesc[i].QueryGetDynamicAttributes += new GetAttributesEventHandler(this.OnGetAttributes); } } ////// /// Here is where we handle IVsPerPropertyBrowsing.GetLocalizedPropertyInfo and IVsPerPropertyBrowsing. HideProperty /// such as IPerPropertyBrowsing, IProvidePropertyBuilder, etc. /// private void OnGetAttributes(Com2PropertyDescriptor sender, GetAttributesEvent attrEvent) { Object target = sender.TargetObject; if (target is NativeMethods.IManagedPerPropertyBrowsing) { Attribute[] attrs = GetComponentAttributes((NativeMethods.IManagedPerPropertyBrowsing)target,sender.DISPID); if (attrs != null) { for (int i = 0; i < attrs.Length; i++) { attrEvent.Add(attrs[i]); } } } } internal static Attribute[] GetComponentAttributes(NativeMethods.IManagedPerPropertyBrowsing target, int dispid) { int cItems = 0; IntPtr pbstrs = IntPtr.Zero; IntPtr pvars = IntPtr.Zero; int hr = target.GetPropertyAttributes(dispid, ref cItems, ref pbstrs, ref pvars); if (hr != NativeMethods.S_OK || cItems == 0) { return new Attribute[0]; } ArrayList attrs = new ArrayList(); string[] attrTypeNames = GetStringsFromPtr(pbstrs, cItems); Object[] varParams = GetVariantsFromPtr(pvars, cItems); Debug.Assert(attrTypeNames.Length == varParams.Length, "Mismatched parameter and attribute name length"); if (attrTypeNames.Length != varParams.Length) { return new Attribute[0]; } // get the types Type[] types = new Type[attrTypeNames.Length]; for (int i = 0; i < attrTypeNames.Length; i++) { string attrName = attrTypeNames[i]; // try the name first Type t = Type.GetType(attrName); Assembly a = null; if (t != null) { a = t.Assembly; } if (t == null) { // check for an assembly name. // string assemblyName = ""; int comma = attrName.LastIndexOf(','); if (comma != -1) { assemblyName = attrName.Substring(comma); attrName = attrName.Substring(0, comma); } string fieldName; int lastDot = attrName.LastIndexOf('.'); if (lastDot != -1) { fieldName = attrName.Substring(lastDot + 1); } else { // somethings odd Debug.Fail("No dot in class name?"); continue; } // try to get the field value if (a == null) { t = Type.GetType(attrName.Substring(0,lastDot) + assemblyName); } else { t = a.GetType(attrName.Substring(0,lastDot) + assemblyName); } if (t == null){ Debug.Fail("Failed load attribute '" + attrName + assemblyName + "'. It's Type could not be found."); continue; } Debug.Assert(typeof(Attribute).IsAssignableFrom(t), "Attribute type " + t.FullName + " does not derive from Attribute"); if (!typeof(Attribute).IsAssignableFrom(t)) { continue; } if (t != null) { FieldInfo fi = t.GetField(fieldName); // only if it's static if (fi != null && fi.IsStatic) { Object fieldValue = fi.GetValue(null); if (fieldValue is Attribute) { // add it to the list attrs.Add(fieldValue); continue; } } else { Debug.Fail("Couldn't load field '" + fieldName + "' from type '" + attrName.Substring(0,lastDot) + "'. It does not exist or is not static"); } } } Debug.Assert(typeof(Attribute).IsAssignableFrom(t), "Attribute type " + t.FullName + " does not derive from Attribute"); if (!typeof(Attribute).IsAssignableFrom(t)) { continue; } Attribute attr = null; // okay, if we got here, we need to build the attribute... // get the initalizer value if we've got a one item ctor if (!Convert.IsDBNull(varParams[i]) && varParams[i] != null) { ConstructorInfo[] ctors = t.GetConstructors(); for (int c=0; c < ctors.Length; c++) { ParameterInfo[] pis = ctors[c].GetParameters(); if (pis.Length == 1 && pis[0].ParameterType.IsAssignableFrom(varParams[i].GetType())) { // found a one-parameter ctor, use it // try to construct a default one try { attr = (Attribute)Activator.CreateInstance(t, new Object[]{varParams[i]}); attrs.Add(attr); } catch { // bummer, nevermind Debug.Fail("Attribute " + t.FullName + " did not have a initalizer specified and has no default constructor"); continue; } } } } else { // try to construct a default one try { attr = (Attribute)Activator.CreateInstance(t); attrs.Add(attr); } catch { // bummer, nevermind Debug.Fail("Attribute " + t.FullName + " did not have a initalizer specified and has no default constructor"); continue; } } } Attribute[] temp = new Attribute[attrs.Count]; attrs.CopyTo(temp, 0); return temp; } private static string[] GetStringsFromPtr(IntPtr ptr, int cStrings) { if (ptr != IntPtr.Zero) { string[] strs = new string[cStrings]; IntPtr bstr; for (int i = 0; i < cStrings; i++) { try{ bstr = Marshal.ReadIntPtr(ptr, i*4); if (bstr != IntPtr.Zero) { strs[i] = Marshal.PtrToStringUni(bstr); SafeNativeMethods.SysFreeString(new HandleRef(null, bstr)); } else { strs[i] = ""; } } catch (Exception ex) { Debug.Fail("Failed to marshal component attribute BSTR " + i.ToString(CultureInfo.InvariantCulture), ex.ToString()); } } try{ Marshal.FreeCoTaskMem(ptr); } catch (Exception ex) { Debug.Fail("Failed to free BSTR array memory", ex.ToString()); } return strs; } else { return new string[0]; } } private static Object[] GetVariantsFromPtr(IntPtr ptr, int cVariants) { if (ptr != IntPtr.Zero) { Object[] objects = new Object[cVariants]; IntPtr curVariant; for (int i = 0; i < cVariants; i++) { try{ curVariant = (IntPtr)((long)ptr + (i* 16 /*sizeof(VARIANT)*/)); if (curVariant != IntPtr.Zero) { objects[i] = Marshal.GetObjectForNativeVariant(curVariant); SafeNativeMethods.VariantClear(new HandleRef(null, curVariant)); } else { objects[i] = Convert.DBNull; } } catch (Exception ex) { Debug.Fail("Failed to marshal component attribute VARIANT " + i.ToString(CultureInfo.InvariantCulture), ex.ToString()); } } try{ Marshal.FreeCoTaskMem(ptr); } catch (Exception ex) { Debug.Fail("Failed to free VARIANT array memory", ex.ToString()); } return objects; } else { return new Object[cVariants]; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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