将数据源动态绑定到gridview

Question

我收到此c＃代码的错误

if (radioAll.Checked)
{
       SqlDataSource DataSource2 = new SqlDataSource();
       DataSource2.ID = "SqlDataSource2";
       this.Page.Controls.Add(DataSource2);
       DataSource2.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["SEP_Project_NewConnectionString2"].ConnectionString;
       DataSource2.SelectCommand = "SELECT courseNo,title from Course";
       gridview_modules.DataSource = DataSource2;
       gridview_modules.DataBind();
}

错误如下

连接字符串正常。如何解决此错误？

Answer 1

您必须从SqlDataSource

中选择一些内容

gridview_modules.DataSource = DataSource2.Select(DataSourceSelectArguments.Empty);
gridview_modules.DataBind();

Answer 2

更改了gridview的列字段

之前就是这样，

<Columns>
  <asp:DynamicField HeaderText="Course No" />
  <asp:DynamicField HeaderText="Title" />
</Columns>

然后我改变了这个，

<Columns>
 <asp:BoundField DataField="courseNo" HeaderText="Course No" />
 <asp:BoundField DataField="title" HeaderText="Title" />
</Columns>