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问题描述
我想在NCalc中执行这个公式：
I'm trying to run this formula in NCalc:
"( Abs([a] - [b]) / ( ([a] + [b]) / 2.0 ) ) * 100"
错误：
Operator '/' can't be applied to operands of types 'decimal' and 'double'
[a]和[b]参数以小数形式传递。我试着把'm'放在2和100上像这样：
The [a] and [b] parameters are passed as Decimals. I tried putting 'm' on the 2 and 100 like so:
"( Abs([a] - [b]) / ( ([a] + [b]) / 2m ) ) * 100m"
例外：
Additional information: extraneous input 'm' expecting ')' at line 1:36
我随后上，但没有回答。任何想法？
I followed this question, but it didn't help me. The same question posted on codeplex with no answer. Any ideas?
推荐答案
可能的解决方法是将 2m 使其正确识别为十进制值，例如：
Possible workaround is to pass 2m as parameter to make it recognized properly as a decimal value, for example :
string strExp = "( Abs([a] - [b]) / ( ([a] + [b]) / [c] ) ) * 100";
Expression e = new Expression(strExp);
e.Parameters["a"] = 3.5m;
e.Parameters["b"] = 1m;
e.Parameters["c"] = 2m; //<- pass 2m as expression parameter
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