如何获取谓词主体？

发布于 2024-08-07 00:49:58 字数 508 浏览 5 评论 0原文

我有一个非常简单的问题，但我无法弄清楚。

方法代码很简单：

protected void Require<TValidator, TParam>(TValidator validator, Expression<Func<TValidator, TParam>> property, Predicate<TParam> predicate)
{
    var propertyValue = property.Compile().Invoke(validator);
    if(!predicate.Invoke(propertyValue))
        throw new ValidatorInitializationException("Error while initializing validator", GetType());
}

问题是我想将更多信息打包到错误消息中。从表达式中获取信息很容易。但是如何获得谓词的“用户友好”字符串表示形式呢？

原文

I Have a quite simple question that I just cant figure out.

The method code is simple:

protected void Require<TValidator, TParam>(TValidator validator, Expression<Func<TValidator, TParam>> property, Predicate<TParam> predicate)
{
    var propertyValue = property.Compile().Invoke(validator);
    if(!predicate.Invoke(propertyValue))
        throw new ValidatorInitializationException("Error while initializing validator", GetType());
}

The problem is that I would like to pack more info into the error message. Getting information out of the expression is easy. But how can I get to a "user friendly" string representation of the predicate?

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笑叹一世浮沉 2024-08-14 00:49:58

您也必须接受它作为表达式树：

protected void Require<TValidator, TParam>(
    TValidator validator, 
    Expression<Func<TValidator, TParam>> property, 
    Expression<Predicate<TParam>> predicateExpression)
{
    var propertyValue = property.Compile().Invoke(validator);
    Predicat<TParam> predicate = predicateExpression.Compile();        
    if(!predicate.Invoke(propertyValue))
    {    
        throw new ValidatorInitializationException(
            "Error while initializing validator: " + predicateExpression,
            GetType());
    }
}

You'd have to accept that as an expression tree too:

protected void Require<TValidator, TParam>(
    TValidator validator, 
    Expression<Func<TValidator, TParam>> property, 
    Expression<Predicate<TParam>> predicateExpression)
{
    var propertyValue = property.Compile().Invoke(validator);
    Predicat<TParam> predicate = predicateExpression.Compile();        
    if(!predicate.Invoke(propertyValue))
    {    
        throw new ValidatorInitializationException(
            "Error while initializing validator: " + predicateExpression,
            GetType());
    }
}

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