GridView表未在asp.net Web表单中显示

Question

我只想显示一些特定查询的gridview。 我在下面尝试过。 当在查询中传递了错误的参数时，此代码显示“没有数据匹配”，但是即使参数正确也不显示任何内容。 我是asp.net的新手。请告诉我，什么重要的行，我不见了

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ViewState["Filter"] = "ALL";
            BindGrid();
        }
    }



private void BindGrid()
    {
        DataTable dt = new DataTable();
        String strConnString = System.Configuration.ConfigurationManager.ConnectionStrings["NorthwindConnectionString1"].ConnectionString;
        SqlConnection con = new SqlConnection(strConnString);
        SqlDataAdapter sda = new SqlDataAdapter();
        string query = "SELECT ContactName, City, Country, PostalCode FROM Customers";
        SqlCommand cmd = new SqlCommand("SELECT ContactName, City, Country, PostalCode FROM Customers WHERE Country='UK'" );
        cmd.Connection = con;
        sda.SelectCommand = cmd;
        sda.Fill(dt);
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }

Answer 1

代码正在工作，并将Northwind数据库的7行返回到gridview。

您的连接字符串应在web.config文件中如下所示：

<connectionStrings>
      <add name="NorthwindConnectionString1" connectionString="server=.; database=northwnd; integrated security=true" providerName="System.Data.SqlClient"/>
</connectionStrings>