Question

Label1的文本不变，这可能是此问题的原因吗？

try
{
    string connectionString = @"Data Source = (localdb)\MSSQLLocalDB; Initial Catalog = db1; Integrated Security = True";
    SqlConnection cnn = new SqlConnection(connectionString);

    string query = "SELECT RNO FROM TABLE1 WHERE RNO='" + PRrno.Text + "'";

    SqlCommand cd = new SqlCommand(query, cnn);
    cnn.Open();

    SqlDataReader reader = cd.ExecuteReader();

    while (reader.Read())
    {
        Label1.Text = reader["RNO"].ToString();
    }

    reader.Close();
    cnn.Close();
}

Answer 1

Gaurav Thapa，就像我在评论中说的那样，请确保在aspx文件中，您的元素具有runat =“ server”并将所有想要刷新的元素都放在Ajax更新面板中

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>UpdatePanel</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <asp:UpdatePanel runat="server" id="UpdatePanel" updatemode="Always">        
            <ContentTemplate>
                <asp:Label runat="server" id="PRrno" />
            </ContentTemplate>
        </asp:UpdatePanel>       
    </form>
</body>
</html>

Answer 2

您必须在数据表中获取查询输出，然后从那里将DataTable值转换为字符串。检查您是否有权访问标签。

Label.Text = //从DataTable转换而来的字符串

从数据库将数据检索到文本框中

2 个答案: