.NET中有字符串数学评估器吗？(Is there a string math evaluator in .NET?)

.NET中有字符串数学评估器吗？(Is there a string math evaluator in .NET?)

如果我有一个具有有效数学表达式的字符串，例如：

String s = "1 + 2 * 7";

在.NET中有内置的库/函数，将解析和评估该表达式并返回结果？ 在这种情况下15。

If I have a string with a valid math expression such as:

String s = "1 + 2 * 7";

Is there a built in library/function in .NET that will parse and evaluate that expression for me and return the result? In this case 15.

最满意答案

您可以添加对Microsoft脚本控制库（COM）的引用，并使用此代码来评估表达式。 （也适用于JScript。）

Dim sc As New MSScriptControl.ScriptControl() sc.Language = "VBScript" Dim expression As String = "1 + 2 * 7" Dim result As Double = sc.Eval(expression)

编辑 - C＃版本。

MSScriptControl.ScriptControl sc = new MSScriptControl.ScriptControl(); sc.Language = "VBScript"; string expression = "1 + 2 * 7"; object result = sc.Eval(expression); MessageBox.Show(result.ToString());

编辑 - ScriptControl是一个COM对象。 在项目的“添加引用”对话框中，选择“COM”选项卡，向下滚动到“Microsoft Script Control 1.0”，然后选择“确定”。

You could add a reference to Microsoft Script Control Library (COM) and use code like this to evaluate an expression. (Also works for JScript.)

Dim sc As New MSScriptControl.ScriptControl() sc.Language = "VBScript" Dim expression As String = "1 + 2 * 7" Dim result As Double = sc.Eval(expression)

Edit - C# version.

MSScriptControl.ScriptControl sc = new MSScriptControl.ScriptControl(); sc.Language = "VBScript"; string expression = "1 + 2 * 7"; object result = sc.Eval(expression); MessageBox.Show(result.ToString());

Edit - The ScriptControl is a COM object. In the "Add reference" dialog of the project select the "COM" tab and scroll down to "Microsoft Script Control 1.0" and select ok.