集列表

Question

我有这样的方法：返回类别对象的名单，我要将此列表输出在C＃中下拉列表中的数据源，我怎么能做到这一点

public List<Category> GetAllCategories() 
     { 
      SqlConnection con = new SqlConnection(connectonstring); 
      SqlCommand cmd = new SqlCommand("GetAllCategories", con); 
      cmd.CommandType = CommandType.StoredProcedure; 

      List<Category> Categories = new List<Category>(); 
      try 
      { 
       con.Open(); 
       SqlDataReader reader = cmd.ExecuteReader(); 
       while (reader.Read()) 
       {     
        Category cat = new Category(); 
        cat.JobCategoryid = Convert.ToInt32(reader["JobCategoryid"]); 
        cat.CategoryName = reader["categoryName"].ToString(); 
        Categories.Add(cat); 
       } 
       reader.Close(); 
       return Categories; 

      } 
      catch (SqlException err) 
      { 
       return null; 
      } 
      finally 
      { 
       con.Close(); 
      } 

     } 

Answer 1

像这样：

dropdownList.DataSource = GetAllCategories(); 
dropdownList.DateTextField= "CategoryName"; 
dropdownList.DataValueField = "JobCategoryid"; 
dropdownList.DataBind();