您可以在第一次做检查，然后使用开关，只要你喜欢

例如：

 字符串str =参数; // test1..test2..test3 .... 

如果回报（message.Contains（STR）！）; 
 

然后

 开关（STR）
 {
案测试1：{}打破; 
案测试2：{}打破; 
默认：{}打破; 
} 
 

I'm doing an C# app where I use

if ((message.Contains("test")))
{
   Console.WriteLine("yes");
} else if ((message.Contains("test2"))) {
   Console.WriteLine("yes for test2");
}

There would be any way to change to switch() the if() statements?

You can do the check at first and then use the switch as you like.

For example:

string str = "parameter"; // test1..test2..test3....

if (!message.Contains(str)) return ;

Then

switch(str)
{
  case "test1" : {} break;
  case "test2" : {} break;
  default : {} break;
}