C＃ASP.NET传递，如果else语句字符串值到另一个字符串

-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(); 
     } 
}

有这样的代码我如何我myquery字符串值设置为我的if else语句在我的页面加载类？我现在的代码总是设置为myquery至null。

来源

2015-11-08 John Paul Cirilos

您在if条件申报 “更改为MyQuery” 再次读取数据，去除串关键字如果CAND else条件，然后再试一次。 –

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(); 
    } 
}

来源

2015-11-08 10:39:49

在您的if/else语句中，您将再次声明myquery。如果你删除了字符串关键字，你应该是金色的;

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，你正在创建你的if/else语句的新变量，导致失去对他们闹翻范围创建后步骤，所以你也不能访问它们。

来源

2015-11-08 10:33:56 Saraphite

使用SQL数据读取器从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();

来源

2015-11-08 10:45:51

C＃ASP.NET传递，如果else语句字符串值到另一个字符串

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