Question

无论如何都要更改＆＃34; Where＆＃34;，它会自动检查包含字符串的所有属性，而不是手动添加每个属性名称？

 items.Where(m => m.Property1.IndexOf(word, StringComparison.CurrentCultureIgnoreCase) >= 0
                                || m.Property2.IndexOf(word, StringComparison.CurrentCultureIgnoreCase) >= 0
                                || m.Property3.IndexOf(word, StringComparison.CurrentCultureIgnoreCase) >= 0
                                || m.Property4?.IndexOf(word, StringComparison.CurrentCultureIgnoreCase) >= 0
                                || m.Property5?.IndexOf(word, StringComparison.CurrentCultureIgnoreCase) >= 0
                                || m.Property6.IndexOf(word, StringComparison.CurrentCultureIgnoreCase) >= 0
                                || m.Property7?.IndexOf(word, StringComparison.CurrentCultureIgnoreCase) >= 0
                                ));

感谢。

Answer 1

我会用反射编写代码......

public bool MyContains(object instance, string word)
{
        return instance.GetType()
                .GetProperties()
                .Where(x => x.PropertyType == typeof(string))
                .Select(x => (string)x.GetValue(instance, null))
                .Where(x => x != null)
                .Any(x => x.IndexOf(word, StringComparison.CurrentCultureIgnoreCase) >= 0);
}

然后你的代码将是

items.Where(m=>MyContains(m,word));

Answer 2

基于L.B回答：我接受了他的回答

我将它分解为两个函数，因为没有必要得到它 where。
中每个实例的字符串属性

public static class ObjectUtils
{
    public static IEnumerable<PropertyInfo> GetPropertiesByType<TEntity>(TEntity entity, Type type)
        {
            return entity.GetType().GetProperties().Where(p => p.PropertyType == type); 
        }

    public static bool CheckAllStringProperties<TEntity>(TEntity instance, IEnumerable<PropertyInfo> stringProperties, string word)
        {
            return stringProperties.Select(x => (string)x.GetValue(instance, null))
                .Where(x => x != null)
                .Any(x => x.IndexOf(word, StringComparison.CurrentCultureIgnoreCase) >= 0);
        }
}

然后

var stringProperties = ObjectUtils.GetPropertiesByType(new Item(), typeof(string)); 

 items.Where(x => ObjectUtils.CheckAllStringProperties(x, stringProperties, word)));

搜索所有字符串属性

2 个答案: