Ejemplo n.º 1
0
        /// <summary>
        /// Provides implementation for type conversion operations. Classes derived from the <see cref="T:System.Dynamic.DynamicObject"/> class can override this method to specify dynamic behavior for operations that convert an object from one type to another.
        /// </summary>
        /// <param name="binder">Provides information about the conversion operation. The binder.Type property provides the type to which the object must be converted. For example, for the statement (String)sampleObject in C# (CType(sampleObject, Type) in Visual Basic), where sampleObject is an instance of the class derived from the <see cref="T:System.Dynamic.DynamicObject"/> class, binder.Type returns the <see cref="T:System.String"/> type. The binder.Explicit property provides information about the kind of conversion that occurs. It returns true for explicit conversion and false for implicit conversion.</param>
        /// <param name="result">The result of the type conversion operation.</param>
        /// <returns>
        /// true if the operation is successful; otherwise, false. If this method returns false, the run-time binder of the language determines the behavior. (In most cases, a language-specific run-time exception is thrown.)
        /// </returns>
        public override bool TryConvert(ConvertBinder binder, out object result)
        {
            result = Dynamic.CoerceToDelegate(this, binder.Type);

            return(result != null);
        }
Ejemplo n.º 2
0
        /// <summary>
        /// Goes the extra mile to convert target to type.
        /// </summary>
        /// <param name="target">The target.</param>
        /// <param name="type">The type.</param>
        /// <returns></returns>
        public static dynamic CoerceConvert(object target, Type type)
        {
            if (target != null && !type.IsInstanceOfType(target) && !IsDBNull(target))
            {
                var delegateConversion = CoerceToDelegate(target, type);

                if (delegateConversion != null)
                {
                    return(delegateConversion);
                }


                if (type.IsInterface && Impromptu.IsAvailable)
                {
                    if (target is IDictionary <string, object> && !(target is DynamicObjects.BaseObject))
                    {
                        target = new DynamicObjects.Dictionary((IDictionary <string, object>)target);
                    }
                    else if (!(target is DynamicObjects.BaseObject))
                    {
                        target = new DynamicObjects.Get(target);
                    }


                    target = Impromptu.DynamicActLike(target, type);
                }
                else
                {
                    try
                    {
                        object tResult;

                        tResult = Dynamic.InvokeConvert(target, type, @explicit: true);

                        target = tResult;
                    }
                    catch (RuntimeBinderException)
                    {
                        Type tReducedType = type;
                        if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable <>))
                        {
                            tReducedType = type.GetGenericArguments().First();
                        }

                        if (typeof(Enum).IsAssignableFrom(tReducedType) && target is string)
                        {
                            target = Enum.Parse(tReducedType, target as String, true);
                        }
                        else if (target is IConvertible && typeof(IConvertible).IsAssignableFrom(tReducedType))
                        {
                            target = Convert.ChangeType(target, tReducedType, Thread.CurrentThread.CurrentCulture);
                        }
                        else
                        {
                            try
                            {
                                dynamic converter = null;
                                if (TypeDescriptor.IsAvailable)
                                {
                                    converter = TypeDescriptor.GetConverter(tReducedType);
                                }
                                else if (TypeConverterAttributeSL != null)
                                {
                                    var tAttributes =
                                        tReducedType.GetCustomAttributes(TypeConverterAttributeSL, false);
                                    dynamic attribute = tAttributes.FirstOrDefault();
                                    if (attribute != null)
                                    {
                                        converter =
                                            Impromptu.InvokeConstructor(Type.GetType(attribute.ConverterTypeName));
                                    }
                                }


                                if (converter != null && converter.CanConvertFrom(target.GetType()))
                                {
                                    target = converter.ConvertFrom(target);
                                }
                            }
                            catch (RuntimeBinderException)
                            {
                            }
                        }
                    }
                }
            }
            else if (((target == null) || IsDBNull(target)) && type.IsValueType)
            {
                target = Dynamic.InvokeConstructor(type);
            }
            else if (!type.IsInstanceOfType(target) && IsDBNull(target))
            {
                return(null);
            }
            return(target);
        }
Ejemplo n.º 3
0
        /// <summary>
        /// Invokes the invocation on specified target with specific args.
        /// </summary>
        /// <param name="target">The target.</param>
        /// <param name="args">The args.</param>
        /// <returns></returns>
        /// <exception cref="System.ArgumentException">CacheableInvocation can't change conversion type on invoke.;args</exception>
        /// <exception cref="System.InvalidOperationException">Unknown Invocation Kind: </exception>
        public override object Invoke(object target, params object[] args)
        {
            var tIContext = target as InvokeContext;

            if (tIContext != null)
            {
                target = tIContext.Target;
            }

            if (args == null)
            {
                args = new object[] { null };
            }


            if (args.Length != _argCount)
            {
                switch (Kind)
                {
                case InvocationKind.Convert:
                    if (args.Length > 0)
                    {
                        if (!Equals(args[0], _convertType))
                        {
                            throw new ArgumentException("CacheableInvocation can't change conversion type on invoke.", "args");
                        }
                    }
                    if (args.Length > 1)
                    {
                        if (!Equals(args[1], _convertExplicit))
                        {
                            throw new ArgumentException("CacheableInvocation can't change explict/implict conversion on invoke.", "args");
                        }
                    }

                    if (args.Length > 2)
                    {
                        goto default;
                    }
                    break;

                default:
                    throw new ArgumentException("args", string.Format("Incorrect number of Arguments for CachedInvocation, Expected:{0}", _argCount));
                }
            }

            switch (Kind)
            {
            case InvocationKind.Constructor:
                var tTarget = (Type)target;
                return(InvokeHelper.InvokeConstructorCallSite(tTarget, tTarget.IsValueType, args, _argNames,
                                                              ref _callSite));

            case InvocationKind.Convert:
                return(InvokeHelper.InvokeConvertCallSite(target, _convertExplicit, _convertType, _context,
                                                          ref _callSite));

            case InvocationKind.Get:
                return(InvokeHelper.InvokeGetCallSite(target, Name.Name, _context, _staticContext, ref _callSite));

            case InvocationKind.Set:
                InvokeHelper.InvokeSetCallSite(target, Name.Name, args[0], _context, _staticContext, ref _callSite);
                return(null);

            case InvocationKind.GetIndex:
                return(InvokeHelper.InvokeGetIndexCallSite(target, args, _argNames, _context, _staticContext, ref _callSite));

            case InvocationKind.SetIndex:
                Dynamic.InvokeSetIndex(target, args);
                return(null);

            case InvocationKind.InvokeMember:
                return(InvokeHelper.InvokeMemberCallSite(target, (InvokeMemberName)Name, args, _argNames, _context, _staticContext, ref _callSite));

            case InvocationKind.InvokeMemberAction:
                InvokeHelper.InvokeMemberActionCallSite(target, (InvokeMemberName)Name, args, _argNames, _context, _staticContext, ref _callSite);
                return(null);

            case InvocationKind.InvokeMemberUnknown:
            {
                try
                {
                    var tObj = InvokeHelper.InvokeMemberCallSite(target, (InvokeMemberName)Name, args, _argNames, _context, _staticContext, ref _callSite);
                    return(tObj);
                }
                catch (RuntimeBinderException)
                {
                    InvokeHelper.InvokeMemberActionCallSite(target, (InvokeMemberName)Name, args, _argNames, _context, _staticContext, ref _callSite2);
                    return(null);
                }
            }

            case InvocationKind.Invoke:
                return(InvokeHelper.InvokeDirectCallSite(target, args, _argNames, _context, _staticContext, ref _callSite));

            case InvocationKind.InvokeAction:
                InvokeHelper.InvokeDirectActionCallSite(target, args, _argNames, _context, _staticContext, ref _callSite);
                return(null);

            case InvocationKind.InvokeUnknown:
            {
                try
                {
                    var tObj = InvokeHelper.InvokeDirectCallSite(target, args, _argNames, _context, _staticContext, ref _callSite);
                    return(tObj);
                }
                catch (RuntimeBinderException)
                {
                    InvokeHelper.InvokeDirectActionCallSite(target, args, _argNames, _context, _staticContext, ref _callSite2);
                    return(null);
                }
            }

            case InvocationKind.AddAssign:
                InvokeHelper.InvokeAddAssignCallSite(target, Name.Name, args, _argNames, _context, _staticContext, ref _callSite, ref _callSite2, ref _callSite3, ref _callSite4);
                return(null);

            case InvocationKind.SubtractAssign:
                InvokeHelper.InvokeSubtractAssignCallSite(target, Name.Name, args, _argNames, _context, _staticContext, ref _callSite, ref _callSite2, ref _callSite3, ref _callSite4);
                return(null);

            case InvocationKind.IsEvent:
                return(InvokeHelper.InvokeIsEventCallSite(target, Name.Name, _context, ref _callSite));

            default:
                throw new InvalidOperationException("Unknown Invocation Kind: " + Kind);
            }
        }