替换C＃中的字符串值？

Question

我是C＃的新手，需要一点帮助，我知道在PHP中我能做到这样的事情

$SelectedEvent="event selected";

if (i > 0)
{
  $SelectedEvent = "event";
}

它很容易替换一个字符串，但是在c＃中工作不正常，这里是我没有的示例代码

  string SelectedEvent = "event selected"; 

  if (i > 0)
    {
         SelectedEvent = "event"; 
    }

这在PHP中不起作用，我无法覆盖变量？

这是我的示例代码

EDITED

for (int i = 0; i < Model.Items.Count; i++)
{

    string SelectedEvent = "event selected";    


    if (i > 1)
    {
         string SelectedEvent = "event"; 
    }

}

Answer 1

您不应该重新声明变量两次，而只是修改其值：

for (int i = 0; i < Model.Items.Count; i++)
{
    string SelectedEvent = "event selected";    
    if (i > 1)
    {
         SelectedEvent = "event"; 
    }

    // here you can use the SelectedEventVariable
    // its value will be "event selected" on the first and second
    // iterations and "event" on subsequent 
}