在aspx页面上添加此代码

Question

我正在开发一个ASP.NET应用程序，我有一个DropDownList，它没有使用SqlDataReader显示来自数据库的数据。下面是我的asp.net网络表单代码......

<p>
 <span class="label">
 <asp:Label ID="Label1" runat="server" Text="Document Number" Font-Size="Small" Font-Bold="True"></asp:Label>
 </span>
 <asp:TextBox ID="numb" runat="server" Width="176px" ReadOnly="true"></asp:TextBox>
 <br />
 <br />
 <span class="label">
 <asp:Label ID="Label2" runat="server" Text="Title" Font-Size="Small" Font-Bold="True"></asp:Label>
 </span>
 <asp:TextBox ID="TextBox1" runat="server" Width="176px"></asp:TextBox><br/>
 <br />
 <span class="label">
 <asp:Label ID="Label3" runat="server" Text="Author" Font-Size="Small" Font-Bold="True"></asp:Label>
 </span>
 <asp:TextBox ID="TextBox2" runat="server" Width="176px"></asp:TextBox><br/>
 <br />
 <span class="label">
 <asp:Label ID="Label4" runat="server" Text="Account Name" Font-Size="Small" Font-Bold="true"></asp:Label>
 </span>
 <asp:DropDownList ID="name" runat="server" AutoPostBack="true" OnSelectedIndexChanged="OnSelectedIndexChanged" AppendDataBoundItems="true">
 <asp:ListItem Text="-SELECT-" Value="" />
 </asp:DropDownList><br />
 <br />
 <span class="label">
 <asp:Label ID="Label5" runat="server" Text="Account Code" Font-Size="Small" Font-Bold="true"></asp:Label>
 </span>
 <asp:DropDownList ID="code" runat="server" AutoPostBack="true"></asp:DropDownList><br />
 <br />

 <span class="label">
 <asp:Label ID="Label6" runat="server" Text="Date" Font-Size="Small" Font-Bold="true"></asp:Label>
 </span>
 <asp:TextBox ID="date" runat="server" Width="176px" ReadOnly="true"></asp:TextBox><br />
 <br />
 <asp:Label ID="results" runat="server"></asp:Label>
 </p>

以下是我的C＃代码

if (!IsPostBack)
            {
                string CS = ConfigurationManager.ConnectionStrings["conn"].ConnectionString;
                using (SqlConnection conn = new SqlConnection(CS))
                {
                    SqlCommand comm = new SqlCommand("SELECT Account_Name FROM Accounts", conn);
                    conn.Open();

                    name.DataSource = comm.ExecuteReader();
                    name.DataTextField = "Account_Name";
                    name.DataValueField = "Account_Name";
                    name.DataBind();
                    OnSelectedIndexChanged(sender, e);
                }

                date.Text = DateTime.Now.ToString("MM/dd/yyyy");
                LoadDetails();
            }
        }

        protected void OnSelectedIndexChanged(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
            string account = "SELECT Account_Code FROM Accounts WHERE Account_Name = '" + name.Text + "'";
            SqlCommand camd = new SqlCommand(account, con);
            con.Open();

            code.DataSource = camd.ExecuteReader();
            code.DataTextField = "Account_Code";
            code.DataValueField = "Account_Code";
            code.DataBind();
            con.Close();
        }

        private void LoadDetails()
        {
            using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString))
            {
                string docNo = Session["doc"].ToString();
                string query = "SELECT * FROM [pubs].[dbo].[ReportDocumentNo] WHERE DocumentNo = @docNo;";
                SqlCommand cmd = new SqlCommand(query, con);
                cmd.Parameters.AddWithValue("@docNo", docNo);
                con.Open();
                using (SqlDataReader rdr = cmd.ExecuteReader())
                {
                    while (rdr.Read())
                    {
                        numb.Text = rdr["DocumentNo"].ToString();
                        TextBox1.Text = rdr["Title"].ToString();
                        TextBox2.Text = rdr["Author"].ToString();
                        name.Text = rdr["AccName"].ToString();
                        code.Text = rdr["AccCode"].ToString();
                    }
                }

            }

        }

无论我运行哪个页面，我的所有文本框都由来自数据库的数据填充，但代码TextBox 除外。我错过了使代码文本框显示数据。谢谢

Answer 1

在aspx页面上添加此代码

<asp:DropDownList ID="ddlMealLocationQT" runat="server" OnSelectedIndexChanged="ddlMealLocationQT_SelectedIndexChanged"></asp:DropDownList>

在Aspx.cs页面

上

protected void ddlMealLocationQT_SelectedIndexChanged(object sender, EventArgs e){
    List<int> months = new List<int>(){1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
    foreach (string month in months)
    {
         DropDownListMonth.Items.Add(month);
    }
}

OR

您可以使用DataTextField和DataValueField属性。

ListControl.DataTextField Property

    DropDownList1.DataSource = drpdt; 
    DropDownList1.DataTextField="StringValue";
    DropDownList1.DataValueField="CurrencyValue";
    DropDownList1.DataBind();

或者一次添加一个ListItem。

https://www.google.com/search?ie=UTF-8&ufsmps=1&oe=UTF-8&sourceid=navclient&gfns=1&q=ASP%20Tutorials

DropDownList，OnSelectedIndexChanged不使用SqlDataReader

1 个答案:

在aspx页面上添加此代码

在Aspx.cs页面