了解 FormCollection.AllKeys.Contains

Question

我正在查看一个代码块，无法理解该行发生了什么 - formValues.AllKeys.Contains("Email_" + i); 看起来应该进行分配，但是。 ..

public ActionResult EditAdditionalLocations(int ID, int? count, FormCollection formValues)
{
    ...

    for (int i = 0; i < _count; i++)
    {
        formValues.AllKeys.Contains("Email_" + i);
        if (locations.Emails.Count > i)
        {
            locations.Emails[i] = formValues["Email_" + i];
        }
        else
        {
            locations.Emails.Add(formValues["Email_" + i]);
        }
    }
}

Answer 1

我的猜测是这样的事情是有意的：

if (formValues.AllKeys.Contains("Email_" + i)) {
    if (locations.Emails.Count > i)
    {
        locations.Emails[i] = formValues["Email_" + i];
    }
    else
    {
        locations.Emails.Add(formValues["Email_" + i]);
    }
}

Answer 2

此行检查 AllKeys 集合是否包含 "Email_" + i，但不对结果执行任何操作。