首页 \ 问答 \ 从类型lambda表达式中获取所有属性表达式(Get all property expressions from a type lambda expressions)

从类型lambda表达式中获取所有属性表达式(Get all property expressions from a type lambda expressions)

我想创建一个HtmlHelper,它可以为类的所有属性生成隐藏字段。

在我的剃刀页面中,我将调用以下内容:

@Html.HiddenForObject(x=>x.SomeClass)

其中x是使用@model SomeOtherClass定义的模型

我的助手被定义为=>

public static MvcHtmlString HiddenForObject<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper,
            Expression<Func<TModel, TProperty>> expression)

现在有些类有一些公共属性,我想为其创建隐藏字段。 但在这里,我被困住了,我需要找到正确的代码来迭代我的表达式中的所有属性,获取这些属性的表达式,以便我可以调用

//Pseudo code
foreach(var propertyExpression in expression) {
@Html.HiddenFor(expression);
}

我尝试了一些东西,但基本上我没有想法。 任何帮助深表感谢。


I want to make a HtmlHelper that can produce hidden fields for all properties of a class.

In my razor page I will call the following:

@Html.HiddenForObject(x=>x.SomeClass)

where x would be the model defined with @model SomeOtherClass

My helper is defined as such =>

public static MvcHtmlString HiddenForObject<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper,
            Expression<Func<TModel, TProperty>> expression)

Now some class has a few public properties that I want to make hidden field for. But here I am stuck I need to find the right code to iterate over all the properties in my expression, get the expressions for those properties so I can call

//Pseudo code
foreach(var propertyExpression in expression) {
@Html.HiddenFor(expression);
}

I tried a few things but basically I ran out of ideas. Any help is much appreciated.


原文:https://stackoverflow.com/questions/29850924
更新时间:2023-01-07 19:01

最满意答案

您只需要开始迭代之前应用逻辑来组织帖子的组织方式。

这是一个例子(这不是功能,只是一个快速说明):

<?php
$col1 = array();
$col2 = array();
$posts = array('one', 'two', 'three', 'four', 'five', 'six');
foreach ($posts as $post) {
    $count++;
    $count % 2 === 1 ? array_push($col1, $post) : array_push($col2, $post);
}
?>
<div class="col-1">
    <?php
    foreach ($col1 as $post) {
        echo '<div class="post">'.$post.'</div>';
    }
    ?>
</div>
<div class="col-2">
    <?php
    foreach ($col2 as $post) {
        echo '<div class="post">'.$post.'</div>';
    }
    ?>
</div>

这会产生输出:

<div class="col-1">
    <div class="post">one</div>
    <div class="post">three</div>
    <div class="post">five</div>
</div>

<div class="col-2">
    <div class="post">two</div>
    <div class="post">four</div>
    <div class="post">six</div>
</div>

如您所见,现在$ posts数组的元素以交替的方式组织在两列中。


You just need to apply logic for how you want the posts organized before you start iterating them.

Here's an example (this isn't functional, just a quick illustration):

<?php
$col1 = array();
$col2 = array();
$posts = array('one', 'two', 'three', 'four', 'five', 'six');
foreach ($posts as $post) {
    $count++;
    $count % 2 === 1 ? array_push($col1, $post) : array_push($col2, $post);
}
?>
<div class="col-1">
    <?php
    foreach ($col1 as $post) {
        echo '<div class="post">'.$post.'</div>';
    }
    ?>
</div>
<div class="col-2">
    <?php
    foreach ($col2 as $post) {
        echo '<div class="post">'.$post.'</div>';
    }
    ?>
</div>

This produces the output:

<div class="col-1">
    <div class="post">one</div>
    <div class="post">three</div>
    <div class="post">five</div>
</div>

<div class="col-2">
    <div class="post">two</div>
    <div class="post">four</div>
    <div class="post">six</div>
</div>

As you can see, now the elements of the $posts array are organized in both columns in an alternating fashion.

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