MathExpression.net 1.0.1.2447

MathExpression.net

A simple .NET 5 Math Expression Parser / Interpreter.

This library interprets mathematical expressions from text input.

Important Note on Localization

Currently the Lib expects German localized input Strings (e.g. for Numbers: Use 2,5 instead 2.5 and Dates in Format dd.mm.yyy ) Will be corrected/extended in one of the next versions

Basic functions

• Math Operations [+] [-] [\] [*] [^]
• String, Date, Number Comparsion [<] [<=] [>] [>=] [=]
• Date calculations (Range)
• Extract Date parts (month, day, year)
• Conditional statement IF THEN ELSE

Installation

MathExpression.net on nuget.org

Examples

Simple Math

var result = ExpressionEvaluator.EvaluateExpression("1+1");
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// result.number -> 2;
// result.ToString() -> "2"
            

More Math

var result = ExpressionEvaluator.EvaluateExpression("((1 + 1) * 10 / (7 / 3.5)) ^ 2 / 10000");
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// result.number -> 1;
// result.ToString() -> "1"
            

If Then Else

 var result = ExpressionEvaluator.EvaluateExpression($"IF 1 > 0 THEN 'Yes, it´s true!' ELSE 'No! Your wrong ..'");
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// result.ToString() -> "Yes, it´s true!");

If Then Else (AND/OR)

 var result = ExpressionEvaluator.EvaluateExpression($"IF (1 > 0 AND 'Yes' != 'No') OR 100/10=10 THEN 'Yes, it´s true!' ELSE 'No! Your wrong ..'");
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// result.ToString() -> "Yes, it´s true!");

String Comparsion

var result = ExpressionEvaluator.EvaluateExpression("'MyString' = 'MyString'");
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// result.boolean ==  True;

Date Calculation

var d1 = new DateTime(2020, 01, 01);
var d2 = new DateTime(2019, 01, 01);
var result = ExpressionEvaluator.EvaluateExpression($"{d1} - {d2}");
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// result.dateRange.TotalDays -> 365

var d1 = new DateTime(2020, 01, 01);
var d2 = new DateTime(2019, 01, 01);
var result = ExpressionEvaluator.EvaluateExpression($"days({d1} - {d2})");
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// result.number -> 365;

Date with strings Calculation

var d1 = "01.01.2020";
var d2 = "01.01.2019";
var result = ExpressionEvaluator.EvaluateExpression($"{d1} - {d2}");
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// result.dateRange.TotalDays -> 365

Date Parts

var d1 = new DateTime(2021, 01, 01);
var result = ExpressionEvaluator.EvaluateExpression($"Year({d1})");
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// result.ToString() -> "2021";
            

Between Date

var d1 = "01.01.2020";
var d2 = "31.12.2020";
var d3 = "15.06.2020";
var result = ExpressionEvaluator.EvaluateExpression($"{d3} BETWEEN {d1} AND {d2}");
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// result.boolean -> True;

Between Numbers

var d1 = 1;
var d2 = 10;
var d3 = 5;
var result = ExpressionEvaluator.EvaluateExpression($"{d3} BETWEEN {d1} AND {d2}");
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// result.boolean -> True;

Using Variables

var values = new Dictionary<string, object>
            {
                { "FirstVar", 1.75 },
                { "SecondVar", 2 },
                { "ResultText", "Your Right!" }
            };

var result = ExpressionEvaluator.EvaluateExpression($"IF FirstVar < SecondVar THEN ResultText", values);
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// result.ToString() -> "Your Right!"

Special Remarks

Special Shout-Out to Christian Parpart as initial Author - a long Time ago!