public static bool TryBind(SyntaxTreeNode node, BindingContext bindingContext, TypeDescription expectedType, out Expression boundExpression, out Exception bindingError) { if (node == null) { throw new ArgumentNullException("node"); } if (bindingContext == null) { throw new ArgumentNullException("bindingContext"); } if (expectedType == null) { throw new ArgumentNullException("expectedType"); } boundExpression = null; bindingError = null; var target = default(Expression); var targetNode = node.GetExpression(throwOnError: false); var propertyOrFieldName = node.GetPropertyOrFieldName(throwOnError: true); var useNullPropagation = node.GetUseNullPropagation(throwOnError: false); var targetType = default(Type); var isStatic = false; if (bindingContext.TryResolveType(targetNode, out targetType)) { target = null; isStatic = true; } else if (targetNode == null) { target = bindingContext.Global; targetType = target != null ? target.Type : null; isStatic = false; switch (propertyOrFieldName) { case Constants.VALUE_NULL_STRING: boundExpression = ExpressionUtils.NullConstant; return(true); case Constants.VALUE_TRUE_STRING: boundExpression = ExpressionUtils.TrueConstant; return(true); case Constants.VALUE_FALSE_STRING: boundExpression = ExpressionUtils.TrueConstant; return(false); default: if (bindingContext.TryGetParameter(propertyOrFieldName, out boundExpression)) { return(true); } break; } } else if (AnyBinder.TryBind(targetNode, bindingContext, TypeDescription.ObjectType, out target, out bindingError)) { Debug.Assert(target != null, "target != null"); targetType = target.Type; isStatic = false; } else { target = null; targetType = null; } if (target == null && targetType == null) { if (bindingError == null) { bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETORESOLVENAME, propertyOrFieldName), node); } return(false); } Debug.Assert(targetType != null, "type != null"); var targetTypeDescription = TypeDescription.GetTypeDescription(targetType); if (isStatic && targetTypeDescription.IsEnum) { var fieldMemberDescription = targetTypeDescription.GetMembers(propertyOrFieldName).FirstOrDefault(m => m.IsStatic); if (fieldMemberDescription == null) { bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETORESOLVEMEMBERONTYPE, propertyOrFieldName, targetType), node); return(false); } boundExpression = fieldMemberDescription.ConstantValueExpression; } else { foreach (var member in targetTypeDescription.GetMembers(propertyOrFieldName)) { if (member.IsStatic != isStatic || member.IsPropertyOrField == false) { continue; } if (member.TryMakeAccessor(target, out boundExpression)) { break; } } } if (boundExpression == null) { bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETORESOLVEMEMBERONTYPE, propertyOrFieldName, targetType), node); return(false); } if (useNullPropagation && isStatic) { bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETOAPPLYNULLCONDITIONALOPERATORONTYPEREF, targetType)); return(false); } if (useNullPropagation && targetTypeDescription.CanBeNull) { bindingContext.RegisterNullPropagationTarget(target); } return(true); }