Question

我有一个带有买家列表的下拉菜单，我正在尝试根据下拉列表中的用户选择将sql查询结果绑定到listview。下面是代码，但列表视图根本没有显示。

 protected void DropDownListSearchByBuyer_SelectedIndexChanged(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Web_FussConnectionString"].ConnectionString);

        SqlCommand cmd = new SqlCommand("SELECT Team_Name FROM Team WHERE Team_ID = @Team_ID", con);
        cmd.Parameters.AddWithValue("@Team_ID", DropDownListSearchByBuyer.Text);
        con.Open();



        var reader = cmd.ExecuteReader();

        ListView1.DataSource = reader;
        ListView1.DataBind();

    }

Listview代码

<asp:ListView ID="ListView1" runat="server">
    </asp:ListView>

Answer 1

在Listview中添加ItemTemplate以显示如下所示的列。

<asp:ListView ID="ListView1" runat="server">
    <ItemTemplate>
            <span><%# Eval("Team_Name") %><span>
    </ItemTemplate>
</asp:ListView>

有关详细信息，请参阅文章：https://msdn.microsoft.com/en-us/library/bb398790.aspx

Answer 2

    void SetListView()
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Web_FussConnectionString"].ConnectionString);

        SqlCommand cmd = new SqlCommand("SELECT Team_Name FROM Team WHERE Team_ID = @Team_ID", con);
        cmd.Parameters.AddWithValue("@Team_ID", DropDownListSearchByBuyer.Text);
        con.Open();
        var reader = cmd.ExecuteReader();
        var readerdata = GetReaderData(reader);
        reader.Close();
        reader = null;
        con.Close();
        con = null;

        ListView1.DataSource = readerdata;
        ListView1.DataBind();
    }

    DataTable GetReaderData(IDataReader reader)
    {
        DataTable dtSchema = reader.GetSchemaTable();
        DataTable readerData = new DataTable();

        if (dtSchema == null)
        {
            return readerData;
        }

        for (int i = 0; i < dtSchema.Rows.Count; i++)
        {
            DataColumn dc = new DataColumn();
            dc.ColumnName = dtSchema.Rows[i]["ColumnName"].ToString();
            readerData.Columns.Add(dc);
        }


        while (reader.Read())
        {
            DataRow dr = readerData.NewRow();

            for (int i = 0; i < readerData.Columns.Count; i++)
            {
                dr[readerData.Columns[i].ColumnName] = reader[readerData.Columns[i].ColumnName];
            }
            readerData.Rows.Add(dr);
        }

        return readerData;
    }

阅读数据后始终Close读者

根据下拉列表选项在listview中显示sql结果

2 个答案: