無效查詢C＃

Question

今天我寫了我的第二個代碼在C＃ 爲什麼不工作？代碼ist（看起來）是正確的！

錯誤代碼：InvalidQuery

代碼：

static void Main(string[] args) 
     { 
      GetComponent("Win32_Processor", "Name"); 
     Console.Read(); 
     Console.ReadKey(); 
     } 

    private static void GetComponent(string hwclass, string syntax) 
    { 
    ManagementObjectSearcher mos = new ManagementObjectSearcher ("root\\CIMV2","SELECT * FROM" + hwclass); 
    foreach(ManagementObject mj in mos.Get()) 
     { 
      Console.WriteLine(Convert.ToString(mj[syntax])); 
     } 


    } 

Answer 1

你之後 「FROM」 缺少空間：

("root\\CIMV2","SELECT * FROM" + hwclass); 

更改爲：

("root\\CIMV2","SELECT * FROM " + hwclass); 

Answer 2

請，使用格式化或串插（C＃6.0+），以避免語法錯誤：

private static void GetComponent(string hwclass, string syntax) { 
    //DONE: keep query readable 
    string query = 
    $@"select * 
     from {hwclass}"; // <- you've missed space here 

    //DONE: wrap IDisposable into using 
    using (ManagementObjectSearcher mos = new ManagementObjectSearcher("root\\CIMV2", query)) { 
    foreach(ManagementObject mj in mos.Get()) 
     Console.WriteLine(Convert.ToString(mj[syntax])); 
    } 
}