查询返回行数并分配给Int变量

Question

Im选择查询中有多少行的计数。我需要将它分配给一个int变量。我怎么做到这一点？

Display.aspx.cs

  **int TotalYesVotes;** 
      Ratings GetYesVotes = new Ratings(); 
      DataTable DATotalYesVotes = GetYesVotes.GetTotalYesVotes(); 
      **//How do i assign that count to TotalYesVotes** 

业务层

 public DataTable GetTotalYesVotes() 
    { 

     DLRatings DlTotalyesVotes = new DLRatings(); 
     return DlTotalyesVotes.GetTotalYesVotes(); 

    } 

我的数据层

public DataTable GetTotalNoVotes() 
    { 
     //get database connection string from config file 
     string strConectionString o= ConfigurationManager.AppSettings["DataBaseConnection"]; 

     //set up sql 
     string StrSql = "SELECT COUNT(*) AS Expr1 FROM Ratings WHERE (PicRating = 2) AND (PicID = 2)"; 

     DataTable dt = new DataTable(); 
     using (SqlDataAdapter daObj = new SqlDataAdapter(StrSql, strConectionString)) 
     { 

      //fill data table 
      daObj.Fill(dt); 
     } 
     return dt; 
     } 

Answer 1

你应该改变周围有很多数据检索：

public int GetTotalNoVotes() 
    { 
     //get database connection string from config file 
     string strConectionString o= ConfigurationManager.AppSettings["DataBaseConnection"]; 

     SqlConnection conn = new SqlConnection(strConnectionString); 
     conn.Open(); 

     SqlCommand oCommand = new SqlCommand("SELECT COUNT(1) AS Expr1 FROM Ratings WHERE (PicRating = 2) AND (PicID = 2)", conn); 

     object oValue = oCommand.ExecuteScalar(); 

     conn.Close(); 

     if (oValue == DBNull.Value) { 
      return 0; 
     } else { 
      return Convert.ToInt32(oValue); 
     } 
    }