RenderAction 的奇怪行为
在视图上，我在循环内调用渲染操作，该操作将创建一个对象数组并返回到带有网格的 PartialView 以显示结果。
视图：
foreach (var item in Model)
<%Html.RenderAction("GridData", "Customer", new {passidx = (new Random().Next(50))});%>
控制器：
public ActionResult GridData(int passidx)
{
List<Customer> cList = new List<Customer>{new Customer() { name = "c" + (1 + passidx).ToString(), address = "a" + (1 + passidx).ToString() },
new Customer() { name = "c" + (2 + passidx).ToString(), address = "a" + (2 + passidx).ToString() }};
return View(cList);
}
大约每 3 次刷新页面就有 2 次，网格中每个元素的值都是相同的，即使我将随机数传递给附加到显示文本的每个操作。
On a View I am calling Render action with from within a loop, the action will create an array of objects and return to a PartialView with a Grid to display the results.
View:
foreach (var item in Model)
<%Html.RenderAction("GridData", "Customer", new {passidx = (new Random().Next(50))});%>
Controller:
public ActionResult GridData(int passidx)
{
List<Customer> cList = new List<Customer>{new Customer() { name = "c" + (1 + passidx).ToString(), address = "a" + (1 + passidx).ToString() },
new Customer() { name = "c" + (2 + passidx).ToString(), address = "a" + (2 + passidx).ToString() }};
return View(cList);
}
Roughly 2 out of every 3 times I refresh the page the values for each element in the grids are the same even though I am passing a random number to each Action which is appended to the displayed text.
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评论（2）
不要在
foreach中调用new Random()，而是在foreach之前声明一个实例。你会得到重复的，因为它使用相同的种子。请参阅这个很好的答案。
示例：
instead of calling
new Random()inforeach, declare one instance beforeforeach. you are getting duplicate because it is using same seed.See this great answer.
Example:
看来是变量的范围导致了问题。如果我在循环内声明 Random 或 int 或其他任何内容都不起作用，则将其移到外部即可。
It looks like it's the scope of the variable that's causing the problem. If I declare Random or int or whatever inside the loop it doesn't work, moving it outside does.