Question

我正在尝试创建一个Sharepoint表单，该表单将行添加到Visual C＃中的GridView。但是，我只能写第一行-当我单击AddRow时，它只会覆盖我输入的最后一行。我曾尝试使用会话和Page.IsPostBack，但在尝试运行Sharepoint时，它们就会死掉。谢谢！

命名空间VisualWebPartProject3.VisualWebPart1 { 公共局部类VisualWebPart1UserControl：UserControl { 数据表dt;

    private void Page_Load(object sender, EventArgs e)
    {

        // if (!Page.IsPostBack)
        //{
        dt = new DataTable();
        CreateDataTableColumns(dt);
        //  }
    }

    private void CreateDataTableColumns(System.Data.DataTable dt)
    {
        dt.Columns.Add("Title");
        dt.Columns.Add("Type");
    }



    protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
    {
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
    }

    protected void AddRow_Click(object sender, EventArgs e)
    {
        string title = txtTitle.Text;
        string selection = selectionList.Text;


        DataRow dr = dt.NewRow();
        //addrows
        dr["Title"] = title;
        dr["Type"] = selection;
        dt.Rows.Add(dr);
        int count = dt.Rows.Count;
        GridView1.DataSource = dt;
        GridView1.DataBind();
        countTxt.Text = count.ToString();
    }
}

}

Answer 1

您必须跟踪Session或Viewstate中的总行。然后从Viewstate加载项目并添加下一行。请查看下面的代码段，以便实际操作。

protected void AddRow_Click(object sender, EventArgs e)
{
    DataTable dt = new DataTable();

    //check if the viewstate exists
    if (ViewState["myTable"] != null)
    {
        //cast the viewstate back to a datatable
        dt = ViewState["myTable"] as DataTable;
    }
    else
    {
        //add columns to tne new datatable
        dt.Columns.Add("Title");
        dt.Columns.Add("Type");

        //add the table to the viewstate
        ViewState["myTable"] = dt;
    }

    string title = "title " + dt.Rows.Count;
    string selection = "selection " + dt.Rows.Count;

    DataRow dr = dt.NewRow();
    dr["Title"] = title;
    dr["Type"] = selection;
    dt.Rows.Add(dr);

    GridView1.DataSource = dt;
    GridView1.DataBind();
}

数据表行被覆盖

1 个答案: