Question

嗨，我有这个错误“对象引用未设置为对象的实例。”在我的字符串构造中。这是什么意思？谢谢你回答=）

   private void BindGrid()
    {

        string constr = ConfigurationManager 
                    .ConnectionStrings["conString"].ConnectionString; //Error here

        sql = "select * from LogDetails";

        SqlConnection con = new SqlConnection(constr);

        SqlDataAdapter sda = new SqlDataAdapter(sql, con);

        DataTable t = new DataTable();

        sda.Fill(t);

        GridView1.DataSource = t;

        GridView1.DataBind();

    }

Answer 1

您需要在web.config文件中添加连接字符串。

<connectionStrings>
  <add name="conString" connectionString="Data Source=serverName;Initial Catalog=Northwind;Persist Security Info=True;UserID=userName;Password=password" providerName="System.Data.SqlClient" />
</connectionStrings>

你调用的对象是空的。在我的字符串上

1 个答案: