DynamicObject隐式转换 [英] DynamicObject implicit casting

问题描述

我有一个DynamicObject的子类，我想实现隐式转换原始类型类似于DO的显式转换方法TryConvert;也就是说，没有编写多个隐式运算符[类型]函数。

用法：

  dynamic myDynamicObject = new MyDynamicObject（1）; 
 int sum = 1 + myDynamicObject; //而不是int i = 1 +（int）myDynamicObject;这是可能的，如果是这样，如何？
 
解决方案
这里有几件事情。
 
 
 
首先，执行二进制操作。因此，您需要替换 TryBinaryOperation 方法。它将在转换前首先调用。然后从TryBinaryOperation方法可以执行转换。
 
 
 
其次，无论什么原因，TryBinaryOperation只有当你写这样的语句时才被调用：
  int sum = myDynamicObject + 1; 
  
从现在看，顺序很重要。我会与DLR团队一起检查这是一个错误还是预期的行为。
 
 
 
 更新： 
这不是一个错误。要支持1 + myDynamicObject和myDynamicObject + 1，你不仅需要TryBinaryOperation，而且还需要TryBinaryOperationFromRight，而当前的DynamicObject根本没有。
 
I have a subclass of DynamicObject and I would like to implement implicit casting for primitive types similarly as DO's explicit casting method TryConvert; that is, without writing multiple implicit operator [type] functions.

Usage:
dynamic myDynamicObject = new MyDynamicObject("1");
int sum = 1 + myDynamicObject; // instead of int i = 1 + (int)myDynamicObject;
Is that possible and if so, how?
解决方案
There are several things going on here.

First, you are performing a binary operation. So, you need to override TryBinaryOperation method as well. It will be called first, before conversion. Then from the TryBinaryOperation method you can perform a conversion.

Second, for whatever reason the TryBinaryOperation is called only if you write a statement like this:
int sum = myDynamicObject + 1;
From what I see now, the order is important. I'll check with the DLR team whether it is a bug or intended behavior.

Update:
It's not a bug. To support both "1 + myDynamicObject" and "myDynamicObject + 1" you need not only TryBinaryOperation, but also something like TryBinaryOperationFromRight, which the current DynamicObject simply does not have.

                        
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