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24 lines
848 B
24 lines
848 B
2 years ago
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using EC.Helper.RabbitFunc.Expressions;
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using EC.Helper.RabbitFunc.Runtime;
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namespace EC.Helper.RabbitFunc.Extern;
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[ExternLambda]
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internal class RoundLambdaExpression : SystemLambdaExpression
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{
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public RoundLambdaExpression()
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: base(typeof(Math).GetMethod(nameof(Math.Round), new Type[] { typeof(double), typeof(int) }), "round", new BodyExpression(),
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Expression.Parameter(typeof(double), "value"),
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Expression.Parameter(typeof(double), "digits"))
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{ }
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private class BodyExpression : Expression
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{
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public override object Eval(RuntimeContext context)
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{
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var value = ParameterExpression.Access<double>(context, "value");
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var digits = (int)ParameterExpression.Access<double>(context, "digits");
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return Math.Round(value, digits);
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}
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}
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}
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