在C＃字符串解析 [英] String Parsing in C#

问题描述

什么是最解析在

"(params (abc 1.3)(sdc 2.0)(www 3.05)....)"

进入在形式结构

struct Params
{
  double abc,sdc,www....;
}

感谢

Thanks

编辑
的结构始终具有相同的参数（名称相同，仅增加一倍，在编译时知道）..但为了不批..同时..

EDIT The structure always have the same parameters (same names,only doubles, known at compile time).. but the order is not granted.. only one struct at a time..

推荐答案

根据您的完整的语法，你有几个选择：
如果这是一个非常简单的语法，你不必来检验它的错误你可以简单地用下面去（这将是快）

Depending on your complete grammar you have a few options: if it's a very simple grammar and you don't have to test for errors in it you could simply go with the below (which will be fast)

var input = "(params (abc 1.3)(sdc 2.0)(www 3.05)....)";
var tokens = input.Split('(');
var typeName = tokens[0];
//you'll need more than the type name (assembly/namespace) so I'll leave that to you
Type t = getStructFromType(typeName);
var obj = TypeDescriptor.CreateInstance(null, t, null, null);
for(var i = 1;i<tokens.Length;i++)
{
    var innerTokens = tokens[i].Trim(' ', ')').Split(' ');
    var fieldName = innerTokens[0];
    var value = Convert.ToDouble(innerTokens[1]);
    var field = t.GetField(fieldName);
    field.SetValue(obj, value);
}

这简单的方法却需要一个很好符合的字符串，否则会出现异常。

that simple approach however requires a well conforming string or it will misbehave.

如果语法是有点复杂的如嵌套（），那么简单的办法是行不通的。

If the grammar is a bit more complicated e.g. nested ( ) then that simple approach won't work.

您可以尝试使用正则表达式，但仍需要一个相当简单的语法，所以如果你最终具有复杂语法您最好的选择是一个真正的解析器。 反讽是易于使用的，因为你可以在简单的C＃它写（有些BNF的知识虽然加号）。

you could try to use a regEx but that still requires a rather simple grammar so if you end up having a complex grammar your best choice is a real parser. Irony is easy to use since you can write it all in simple c# (some knowledge of BNF is a plus though).

这篇关于在C＃字符串解析的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！