C# 在MVC中使用Foreach循环

如何在MVC中处理

foreach

循环。在下面的控制器中，我调用了一个名为

SendSimpleMessage（）

的方法，该方法向其参数输入发送电子邮件，但在我的控制器上，我无法正确使用

foreach

---

您的代码是错误的，

foreach

循环应该如下所示

foreach (var currentEmail in Emails) { //where var can be your Class maybe Email
    SendSimpleMessage(currentEmail);
}

通常，foreach看起来像：

foreach(T objectName in YourCollection){
       //T is your class
       //objectName is the way you access the object within your loop
       //in references the list
       //YourCollection is IEnumerable<T>
}

foreach（集合中的T objectName）{
//这是你的班级
//objectName是在循环中访问对象的方式
//列表中的参考文献
//你的收藏是数不清的
}

ForEach语句的定义

for-each语句用于遍历集合。您可以修改集合中的元素，但不能添加或删除元素。这些语句将针对数组或集合中的每个元素执行。集合中所有元素的迭代完成后，控制权将转移到每个块的

语法：

   for each (type identifier in expression) 
  {  
       statements  
    }  

string[] countries = { "india", "US", "UK" };


        foreach (string value in countries )
        {
            Console.WriteLine(value);
        }

 [HttpPost]
            public ActionResult EmailCampaignProcess(FormCollection collection)
            {
                //var userType = Request["userType"];
                //var emailContent = Request["emailContent"];
                //SendSimpleMessage();
                //ViewBag.Message = "Hello " + Request["userType"];


                var Emails = db.Users.Where(d => d.Subscriptions.Any(x => x.Status == true)).Select(u => u.Email).ToArray();

 foreach (string SingleEmail in Emails) {

                    SendSimpleMessage(SingleEmail);

                }
         // Or if you are not sure about the outcome type you can use the var keyword like below

                foreach (var SingleEmail in Emails) {

                    SendSimpleMessage(SingleEmail);

                }

            }

参数类型

标识符的类型

标识符

表示集合元素的迭代变量。当标识符是跟踪引用运算符时，可以修改元素

表达

数组表达式或集合。集合元素必须是编译器可以将其转换为标识符类型的元素

声明

要执行的一个或多个语句

简单示例：

   for each (type identifier in expression) 
  {  
       statements  
    }  

string[] countries = { "india", "US", "UK" };


        foreach (string value in countries )
        {
            Console.WriteLine(value);
        }

 [HttpPost]
            public ActionResult EmailCampaignProcess(FormCollection collection)
            {
                //var userType = Request["userType"];
                //var emailContent = Request["emailContent"];
                //SendSimpleMessage();
                //ViewBag.Message = "Hello " + Request["userType"];


                var Emails = db.Users.Where(d => d.Subscriptions.Any(x => x.Status == true)).Select(u => u.Email).ToArray();

 foreach (string SingleEmail in Emails) {

                    SendSimpleMessage(SingleEmail);

                }
         // Or if you are not sure about the outcome type you can use the var keyword like below

                foreach (var SingleEmail in Emails) {

                    SendSimpleMessage(SingleEmail);

                }

            }

以同样的方式更改代码，如下所示：

   for each (type identifier in expression) 
  {  
       statements  
    }  

string[] countries = { "india", "US", "UK" };


        foreach (string value in countries )
        {
            Console.WriteLine(value);
        }

 [HttpPost]
            public ActionResult EmailCampaignProcess(FormCollection collection)
            {
                //var userType = Request["userType"];
                //var emailContent = Request["emailContent"];
                //SendSimpleMessage();
                //ViewBag.Message = "Hello " + Request["userType"];


                var Emails = db.Users.Where(d => d.Subscriptions.Any(x => x.Status == true)).Select(u => u.Email).ToArray();

 foreach (string SingleEmail in Emails) {

                    SendSimpleMessage(SingleEmail);

                }
         // Or if you are not sure about the outcome type you can use the var keyword like below

                foreach (var SingleEmail in Emails) {

                    SendSimpleMessage(SingleEmail);

                }

            }

---

希望以上信息对您有所帮助

foreach（电子邮件中的电子邮件）{SendSimpleMessage（电子邮件）；}您可以通过电子邮件而不是电子邮件进行迭代。然后，对于每封“电子邮件”，你都会做一些事情。推荐阅读时，你忘了问一个问题。英语中的问题带有问号，？，可以得到答案。请问一个实际的问题，因为这是您填写的方框。