[英]C# evaluate a string expression and return the result
試圖找出在.net / C#中使用哪種方法來評估運行時中的簡單表達式。 代碼必須符合.net標准,我不想要奇怪的依賴。
我已經研究過使用Microsoft.CodeAnalysis.CSharp.Scripting: 如何動態評估C#代碼? 但對我的用例來說似乎有些過分。
public class Evaluate
{
private Dictionary<string, object> _exampleVariables = new Dictionary<string, object>
{
{"x", 45},
{"y", 0},
{"z", true}
};
private string _exampleExpression = "x>y || z";
private string _exampleExpression2 = @"if(x>y || z) return 10;else return 20;
";
public object Calculate(Dictionary<string, object> variables, string expression)
{
var result = //Magical code
return result;
}
}
在C#中你可以這樣做:
class Program
{
private static Func<Dictionary<string, object>, object> function1 = x =>
{
return ((int)x["x"] > (int)x["y"]) || (bool)x["z"];
};
private static Func<Dictionary<string, object>, object> function2 = x =>
{
if (((int)x["x"] > (int)x["y"]) || (bool)x["z"])
{
return 10;
}
else
{
return 20;
}
};
static void Main(string[] args)
{
Dictionary<string, object> exampleVariables = new Dictionary<string, object>
{
{"x", 45},
{"y", 0},
{"z", true}
};
Console.WriteLine(Calculate(exampleVariables, function2));
}
public static object Calculate(Dictionary<string, object> variables, Func<Dictionary<string, object>, object> function)
{
return function(variables);
}
}
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