使用字符串的反射对象访问 [英] Reflected object access using a string

问题描述

我想仅使用字符串访问通用对象.我知道通过反射可以访问通用对象，所以我需要正确解析字符串表达式，提取对象访问令牌，并使用反射执行它们.

I'd like to access to a generic object using only a string. I know that with reflection it is possible to access to generic object, so I need to parse correctly the string expression, extract object accesses tokens, and execute them using reflection.

看起来很简单，但我发现表达式解析有困难，因为正则表达式.

It seems quite easy, but I found difficoulties in the expression parsing because regular expression.

我的最终目标应该是基于对象属性的字符串渲染.一个例子是 DebuggerDisplayAttribute，它允许生成一个字符串通过访问一个对象.我没有发现任何对执行字符串处理有用的东西；所以我开始使用正则表达式手动解析表达式字符串.

My final target should be a string rendering, based on object properties. An example is the DebuggerDisplayAttribute, which allow to produce a string by accessing to an object. I didn't find anything useful for performing the string processing; so I've started to manually parse the expression string using regular expression.

例如下面的表达式就很简单:

For example, the following expression it quite easy:

"MyFixedString = {PropertyName}"

因此，包含在{ ... }"中的标记代表一个对象属性.提取属性名称，使用反射获取值，调用ToString()方法并替换到表达式字符串上以获取结果.

So, the tokens enclosed to "{ ... }" represents an object property. Extract the property name, get the value using reflection, calls the ToString() method and replace it on the expression string to get the result.

但我想执行更复杂的对象访问:

But Id like to perform more complex object access:

"MyFixedString = {Property.Method(\"MyMethodArg.1\", \"MyMethodArg.2\").Field}"

当然，我知道对象访问是用点分隔的(但这并不简单，因为点可能存在于其他元素(即方法参数)中.此外，我需要识别方法、字段/属性、索引属性.

Of course, I understand that object accesses are separated by dots (but this is not simple since the dots could be present in another elements (i.e. method arguments). Additionally, I need to recognize methods, field/properties, indexed properties.

遗憾的是，我缺少正则表达式基础知识(我发誓我会研究它们！).

Sadly, I'm missing regular expression basics (i swear i'll study them!).

所以，我的问题是:是否有一些内置类可以满足我的需求?如果没有，我需要一个正则表达式，将输入字符串拆分为单个字符(在我的情况下是点和逗号)，但不要拆分字符用双引号括起来的情况.

So, my question is: is there some built-in class which do what I need? If not, I need a regular expression which split the input string by a single character (in my cases are dots and commas), but don't split in the case the character is enclosed in double quotes.

最后一个例子将被拆分为

The last example would be splitted in

• 财产
• 方法(\"MyMethodArg.1\", \"MyMethodArg.2\")
  • 方法
  • "MyMethodArg.1\"
  • \"MyMethodArg.2\"

  推荐答案

  也许你应该看看 FormatWith.

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