C＃ASP.NET傳遞，如果else語句字符串值到另一個字符串

-1

public partial class Reports : System.Web.UI.Page 
    { 

     private string myquery = null; 
     MySqlConnection conn = new MySqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString); 


     protected void Page_Load(object sender, EventArgs e) 
     { 

      usertype = Session["usertype"].ToString(); 
      { 


       if (usertype == "admin") 
       { 
        string myquery = @"SELECT jobId, odometerReading, jobDescription, status FROM joborder Where truck_id = '" + truck_id + "'"; 
       } 
       else 
       { 
        string myquery = @"SELECT jobId, odometerReading, jobDescription, status FROM joborder Where truck_id = '" + truck_id + "' and status = '1'"; 
       } 

      } 
      connectDB(); 
     } 
}

有這樣的代碼我如何我myquery字符串值設置爲我的if else語句在我的頁面加載類？我現在的代碼總是設置爲myquery至null。

來源

2015-11-08 John Paul Cirilos

您在if條件申報「更改爲MyQuery」再次讀取數據，去除串關鍵字如果CAND else條件，然後再試一次。 –

public partial class Reports : System.Web.UI.Page 
{ 

    private string myquery = string.Emplty; //Try use this 
    MySqlConnection conn = new MySqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString); 


    protected void Page_Load(object sender, EventArgs e) 
    { 

     usertype = Session["usertype"].ToString(); 

      if (usertype == "admin") 
      { 
       myquery = @"SELECT jobId, odometerReading, jobDescription, status FROM joborder Where truck_id = '" + truck_id + "'"; 
      } 
      else 
      { 
       myquery = @"SELECT jobId, odometerReading, jobDescription, status FROM joborder Where truck_id = '" + truck_id + "' and status = '1'"; 
      } 

     connectDB(); 
    } 
}

來源

2015-11-08 10:39:49

在您的if/else語句中，您將再次聲明myquery。如果你刪除了字符串關鍵字，你應該是金色的;

if (usertype == "admin") 
     { 
      myquery = @"SELECT jobId, odometerReading, jobDescription, status FROM joborder Where truck_id = '" + truck_id + "'"; 
     } 
     else 
     { 
      myquery = @"SELECT jobId, odometerReading, jobDescription, status FROM joborder Where truck_id = '" + truck_id + "' and status = '1'"; 
     }

目前，你正在創建你的if/else語句的新變量，導致失去對他們鬧翻範圍創建後步驟，所以你也不能訪問它們。

來源

2015-11-08 10:33:56 Saraphite

使用SQL數據讀取器從SQL Server

SqlCommand command ; 
if (usertype == "admin") 
    { 
      command = new SqlCommand("SELECT jobId, odometerReading, jobDescription, status FROM joborder Where truck_id = '" + truck_id + "'",connection); 
connection.Open(); 

     } 
     else 
     { 
    command = new SqlCommand("SELECT jobId, odometerReading, jobDescription, status FROM joborder Where truck_id = '" + truck_id + "' and status = '1'",connection); 
    connection.Open(); 
     } 
     SqlDataReader reader = command.ExecuteReader();

來源

2015-11-08 10:45:51

C＃ASP.NET傳遞，如果else語句字符串值到另一個字符串

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