Microsoft.VisualStudio.Project.SingleFileGenerator.CanEditFile C# (CSharp) Method

        protected virtual bool CanEditFile(string documentMoniker)
        {
            Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "\t**** CanEditFile called ****"));

            // Check the status of the recursion guard
            if(this.gettingCheckoutStatus)
            {
                return false;
            }

            try
            {
                // Set the recursion guard
                this.gettingCheckoutStatus = true;

                // Get the QueryEditQuerySave service
                IVsQueryEditQuerySave2 queryEditQuerySave = (IVsQueryEditQuerySave2)this.projectMgr.GetService(typeof(SVsQueryEditQuerySave));

                // Now call the QueryEdit method to find the edit status of this file
                string[] documents = { documentMoniker };
                uint result;
                uint outFlags;

                // Note that this function can popup a dialog to ask the user to checkout the file.
                // When this dialog is visible, it is possible to receive other request to change
                // the file and this is the reason for the recursion guard.
                int hr = queryEditQuerySave.QueryEditFiles(
                    0,              // Flags
                    1,              // Number of elements in the array
                    documents,      // Files to edit
                    null,           // Input flags
                    null,           // Input array of VSQEQS_FILE_ATTRIBUTE_DATA
                    out result,     // result of the checkout
                    out outFlags    // Additional flags
                );

                if(ErrorHandler.Succeeded(hr) && (result == (uint)tagVSQueryEditResult.QER_EditOK))
                {
                    // In this case (and only in this case) we can return true from this function.
                    return true;
                }
            }
            finally
            {
                this.gettingCheckoutStatus = false;
            }

            return false;
        }