Question

当我尝试向前一个粉碎的数据集中添加记录时，我有一个表单，每次点击button1后我都会将数据添加到数据集中，并且每次只找到我的上一个记录这是我的代码

    public partial class _Default : System.Web.UI.Page 
    {

        private DataTable dt=new DataTable("manager");
        private DataSet data_set=new DataSet("Test");
        private static int _stagiaireid = 0;
        public static int StagiaireID { get { return _stagiaireid++; } }

        protected void Page_Load(object sender, EventArgs e)
        {

            //dt = new DataTable("manager");

            dt.Columns.Add("id ", typeof(int));
            dt.Columns.Add("electro ", typeof(string));
            dt.Columns.Add("sn", typeof(string));
            dt.Columns.Add("date ", typeof(string));
            dt.Columns.Add("email", typeof(string));
            dt.Columns.Add("marque ", typeof(string));
            DropDownList1.Items.Add(new ListItem("Siera", "Siera"));
            DropDownList1.Items.Add(new ListItem("AB","AB"));
            DropDownList1.Items.Add(new ListItem("CD","CD"));
            data_set.Tables.Add(dt);
           GridView1.DataSource = data_set.Tables["manager"];


        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            String electro = TextBox1.Text;
            String sn = TextBox2.Text;
            String date = TextBox3.Text;
            String email = TextBox4.Text;
            String marque = DropDownList1.SelectedValue.ToString() ;
            if (aide.nom_pre(email)==true)
            {
                Label1.Text = "Email Juste";
            }
            else
            {
                Label1.Text = "Email Faux";
                return;
            }
            data_set.Tables["manager"].Rows.Add(StagiaireID, electro, sn, date, email, marque);
           // dt.Rows.Add(StagiaireID,electro, sn, date, email, marque);
            GridView1.DataBind();
     }

Answer 1

当然，您只会获得最后一条记录，因为您在每个回发中创建并填充DataSet和DataTable并且您没有将DataSet存储在会话状态中你也没绑定GridView 将您的代码更改为：

    private DataTable dt = new DataTable("manager");
    private DataSet data_set = new DataSet("Test");
    private static int _stagiaireid = 0;
    public static int StagiaireID { get { return _stagiaireid++; } }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            dt.Columns.Add("id ", typeof(int));
            dt.Columns.Add("electro ", typeof(string));
            dt.Columns.Add("sn", typeof(string));
            dt.Columns.Add("date ", typeof(string));
            dt.Columns.Add("email", typeof(string));
            dt.Columns.Add("marque ", typeof(string));
            data_set.Tables.Add(dt);
            GridView1.DataSource = data_set.Tables["manager"];

            this.ViewState["ds"] = data_set;
            GridView1.DataBind();
        }
        else
        {
            data_set = (DataSet)ViewState["ds"];
        }

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        String electro = TextBox1.Text;
        String sn = TextBox2.Text;
        String date = TextBox3.Text;
        String email = TextBox4.Text;
        String marque = DropDownList1.SelectedValue.ToString();
        if (aide.nom_pre(email) == true)
        {
            Label1.Text = "Email Juste";
        }
        else
        {
            Label1.Text = "Email Faux";
            return;
        }

        data_set.Tables["manager"].Rows.Add(StagiaireID, electro, sn, date, email, marque);       
        GridView1.DataSource = data_set.Tables["manager"];
        GridView1.DataBind();
        this.ViewState["ds"] = data_set;
    }

最好理解ASP.NET Page Life Cycle和此tutorial

Answer 2

问题是你没有在帖子后面保留数据集。所以保持你的数据集在会话中。请参阅ASP.NET中的状态管理机制

Answer 3

在将数据表绑定到网格视图之前，请在已添加行的数据表上调用AcceptChanges()方法，然后再次使用此表将DataSource分配给网格视图。

data_set.Tables["manager"].Rows.Add(StagiaireID, electro, sn, date, email, marque);
data_set.Tables["manager"].AcceptChanges();
GridView1.DataSource = data_set.Tables["manager"];
GridView1.DataBind();

将记录添加到数据集asp.net？

3 个答案: