将项目添加到Razor视图中的字符串数组 [英] Add Item To String Array In Razor View

问题描述

我在一个剃须刀视图中声明一个字符串数组

  @ {var siteList = new List< string>();var stockTypeList = new List< string>();} 

在multiselect上有一个事件会遍历所选值，我想将每个所选项目的值添加到此数组中

  $('#stockTypeArea select:selected').each(function(i，selected){@ stockTypeList.Add(selected.val());}); 

当前，它抱怨无法解析选定"值.所以我的问题是如何将这些字符串值添加到我的字符串数组中?

我需要字符串数组的原因是，我将其作为@ Html.Action的一部分发回了<​​/p>

  @ HTML.Action("CustomReport_Data"，"Reports"，新的{stockCodesList = stockTypeList})))) 

也许有更好的方法来捕获此字符串列表并将其传递回控制器.

即使我尝试使用以下方法测试对字符串数组的添加方法:

  @ stockTypeList.Add("Test"); 

我收到一条错误消息:

  Expression必须返回一个值以呈现 

解决方案

剃刀代码正在服务器端运行.

jQuery运行在客户端，事件处理程序也在运行.

此:

  $('#stockTypeArea select:selected').each(function(i，selected){@ stockTypeList.Add(selected.val());}); 

是两者的结合，但这是行不通的. selected.val()是客户端， @ stockTypeList.Add(...)是服务器端.

所有这些都解释了您的第一条错误消息.

---

@ stockTypeList.Add("Test"); 也是Razor(服务器端)语句.它将字符串添加到列表中，但是该方法未返回值( public void Add(T item)). @ Razor运算符采用以下表达式，并将其作为URL编码的字符串写入客户端文档，但您未向其提供合法值( void )./p>

这说明了您的第二个错误.

---

@ HTML.Action(...)生成一个带有URL的链接，该URL可以包含查询字符串参数.这些通常来自调用中的第三个参数:

  @ HTML.Action("CustomReport_Data"，"Reports"，新的{stockCodesList = stockTypeList})))) 

但是在执行此代码时(服务器端)，列表当然是空的.

您需要在客户端代码(例如JavaScript数组)中收集字符串，并使用这些字符串构建用于导航的URL.

I have a razor view where I am declaring a string array

@{
  var siteList = new List<string>();
  var stockTypeList = new List<string>();
}

There is an event on a multiselect that iterates over the selected values and I want to add the value of each of the selected items to this array

$('#stockTypeArea select :selected').each(function (i, selected) {
  @stockTypeList.Add(selected.val());
});

Currently this complains that it cannot resolve the 'selected' value. So my question is how can I add these string values to my string array?

The reason I need the string array is that I post this back as part of a @Html.Action

@HTML.Action("CustomReport_Data", "Reports", new { stockCodesList = stockTypeList })))

Perhaps there is a better way to capture this list of strings and pass back to the controller.

Even when I try and test the add method to my string array with:

@stockTypeList.Add("Test");

I get an error that:

Expression must return a value to render

解决方案

Razor code is running server-side.

jQuery is running client-side, and so is your event handler.

This:

$('#stockTypeArea select :selected').each(function (i, selected) {
  @stockTypeList.Add(selected.val());
});

Is a mix of both, but that can't ever work. selected.val() is client-side, @stockTypeList.Add(...) is server-side.

All of this explains your first error message.

---

@stockTypeList.Add("Test"); is also a Razor (server-side) statement. It adds a string to your list, but the method doesn't return a value (public void Add(T item)). the @ Razor operator takes the following expression and writes it as a URL encoded string to the client document, but you're not providing it a legal value (void).

This explains your second error.

---

@HTML.Action(...) generates a link with a url that can include query string parameters. These are normally coming from the 3rd argument in your call:

@HTML.Action("CustomReport_Data", "Reports", new { stockCodesList = stockTypeList })))

But at the time you execute this code (server-side) the list is of course empty.

You need to collect your string in client-side code (JavaScript array for example) and construct a URL for navigation using these strings.

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