Winform开发中如何将数据库字段绑定到ComboBox控件

public static SqlDataReader GetReader(string sql) 2 { 3 SqlConnection conn = new SqlConnection(connString); 4 SqlCommand cmd = new SqlCommand(sql, conn); 5 try 6 { 7 conn.Open(); 8 return cmd.ExecuteReader(CommandBehavior.CloseConnection); 9 } 10 catch (Exception ex) 11 { 12 conn.Close(); 13 //将错误信息写入日志... 14 15 throw ex; 16 } 17 }

 

封装到集合中：

 1 public List<StudentClass> GetAllClasses()
 2     {
 3         string sql = "select ClassName,ClassId from StudentClass";
 4         SqlDataReader objReader = SQLHelper.GetReader(sql);
 5         List<StudentClass> list = new List<StudentClass>();
 6         while (objReader.Read())
 7         {
 8             list.Add(new StudentClass()
 9             {
10                 ClassId = Convert.ToInt32(objReader["ClassId"]),
11                 ClassName = objReader["ClassName"].ToString()
12             });
13         }
14         objReader.Close();
15         return list;
16     }

 

然后在窗体初始化方法里面调用并绑定数据：

 1  private StudentClassService objClassService = new StudentClassService();
 2 
 3     public FrmAddStudent()
 4     {
 5         InitializeComponent();
 6         //初始化班级下拉框
 7         this.cboClassName.DataSource = objClassService.GetAllClasses();
 8         this.cboClassName.DisplayMember = "ClassName";
 9         this.cboClassName.ValueMember = "ClassId";
10 
11     }

 

第二种情况：

SQLHelper类中的代码：

1  public static DataSet GetDataSet(string sql)
2     {
3         SqlConnection conn = new SqlConnection(connString);
4         //SqlCommand cmd = new SqlCommand(sql, conn);
5         SqlDataAdapter da = new SqlDataAdapter(sql, conn);
6         DataSet ds = new DataSet();
7         da.Fill(ds);
8         return ds;
9     }

 

然后在窗体初始化方法里面调用并绑定数据：

 1 public partial class FrmVoucherQuery : Form
 2 {
 3     public FrmVoucherQuery()
 4     {
 5         InitializeComponent();
 6         string sql = string.Format("Select FName From t_VoucherGroup Order by FGroupID");
 7         //控件名.DataSource=数据集.数据表
 8         cbVoucherName.DataSource = SQLHelper.GetDataSet(sql).Tables[0];
 9         cbVoucherName.DisplayMember = "FName";
10         cbVoucherName.ValueMember = "FName";
11     }
12 }

 

Winform开发中如何将数据库字段绑定到ComboBox控件

标签：对象   cep   ...   stat   inf   form   方法   splay   rom