asp.net 中使用不同的数据源绑定gridview

第一种，使用SqlDataReader绑定gridview。代码如下：

        public SqlDataReader bind() 
        {
            SqlConnection con = new SqlConnection(sqlcon);
            string sql = "SELECT * FROM test";
            SqlCommand cmd = new SqlCommand(sql, con);
            con.Open();
            SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return dr;
        }

       protected void Page_Load(object sender, EventArgs e)
        {
            GridView1.DataSource = bind();
            GridView1.DataBind();
        }

第二种，使用dataset来绑定gridview。代码如下：

       public DataSet binddata1() 
        {
            DataSet ds = new DataSet();
            SqlConnection con = new SqlConnection(sqlcon);
            string sql = "SELECT * FROM test";
            SqlDataAdapter adt = new SqlDataAdapter(sql, con);
            adt.Fill(ds);
            return ds;

        }

       protected void Page_Load(object sender, EventArgs e)
        {
            GridView1.DataSource = binddata1();
            GridView1.DataBind();
        }

第三种，使用datatable绑定gridview。代码如下：

       public DataTable binddata() 
        {
            DataTable tt = new DataTable();
            SqlConnection con = new SqlConnection(sqlcon);
            string sql = "SELECT * FROM test";
            SqlDataAdapter adt = new SqlDataAdapter(sql, con);
            adt.Fill(tt);
            return tt;
        }

      protected void Page_Load(object sender, EventArgs e)
        {
            GridView1.DataSource = binddata();
            GridView1.DataBind();
        }

下面来说一下怎么读取SqlDataReader中的数据。代码如下：

     protected void Page_Load(object sender, EventArgs e)
        {
            SqlDataReader test3 = bind();
            while (test3.Read()) 
            {
                Response.Write(test3[0]);
                Response.Write(test3[1]);
            }
        }

读取datatable中的数据,代码如下：

       protected void Page_Load(object sender, EventArgs e)
        {
           
            DataTable test2 = binddata();
           for (int i = 0; i < test2.Rows.Count; i++)
            {
                Response.Write(test2.Rows[i][0]);
            }
            
        }

读取dataset中的数据，代码如下：

      protected void Page_Load(object sender, EventArgs e)
        {
            DataSet test1 = binddata1();
           for (int i=0; i <test1.Tables[0].Rows.Count; i++) 
            {
                Response.Write(test1.Tables[0].Rows[i][0]);
                Response.Write(test1.Tables[0].Rows[i][1]);
                
            }
        }

仅以此来怀恋一下。