Datalist ASP.NET中的Gridview

Question

我想在asp数据列表中放置一个asp gridview。对于数据列表中的每个项目，我希望返回来自另一个数据库表的某些值。

我已经写了下面的代码，但gridview返回不是数据（我可以确认数据库中有记录，存储过程是正确的）。 asp datalist工作正常。

我在做什么错误，不填充gridview？

<asp:DataList runat="server" id="listResponses" DataKeyField="QuestionID" CssClass="confirm" OnItemDataBound="listResponses_ItemDataBound"> 
    <ItemTemplate> 
    <h3 class="confirm new">Question <asp:Label ID="lblaOrder" runat="server" Text='<%# Container.ItemIndex + 1 %>'></asp:Label></h3> 
    <div class="confirm_question"> 
     <asp:Label ID="lblOrder" runat="server" Text='<%# Container.ItemIndex + 1 %>'></asp:Label> 
     <p class="confirm"><%# DataBinder.Eval(Container.DataItem, "QuestionText") %></p> 
    </div> <!-- end confirm_question --> 
    <asp:GridView runat="server" ID="gridResponses" DataKeyNames="QuestionID""> 
     <Columns> 
      <asp:BoundField DataField="AnswerTitle" HeaderText="ID" HeaderStyle-Width="80px" ItemStyle-CssClass="bo"></asp:BoundField> 
      <asp:BoundField DataField="Responses" HeaderText="Response Count" HeaderStyle-Width="150px" /> 
     </Columns> 
     </asp:GridView> 
    </ItemTemplate> 
</asp:DataList> 

这里是后面的代码。

public partial class questionnaire_responses : System.Web.UI.Page 
{ 
    OsqarSQL GetData; 
    DataTable DT; 
    private string _productConnectionString; 
    private SqlConnection _productConn;  

    protected void Page_Load(object sender, EventArgs e) 
    { 
     string questionnaireId = Session["qID"].ToString(); 
     int qid = Convert.ToInt32(questionnaireId); 
     GetData = new OsqarSQL(); 
     string name = GetData.GetQuestionnaireName(qid); 
     lblQuestionnaireName.Text = name; 
     if (!IsPostBack) 
     { 
      DT = GetData.GetQuestionNameDataList(qid); 
      listResponses.DataSource = DT; 
      listResponses.DataBind(); 
     } 
    } 

    private void BindGrid(GridView GridView, int questionId) 
    { 
     DataTable dt = new DataTable(); 
     GetData.GetAnswerTitle(questionId); 
     GridView.DataSource = dt; 
     GridView.DataBind(); 
    } 

    protected void listResponses_ItemDataBound(object sender, DataListItemEventArgs e) 
    { 
     GridView gridResponses=(GridView)e.Item.FindControl("gridResponses"); 
     BindGrid(gridResponses, (int)listResponses.DataKeys[e.Item.ItemIndex]); 
    } 

} 

//Method from the data access class 
public DataTable GetAnswerTitle(int QuestionId) 
{ 
    string returnValue = string.Empty; 
    SqlCommand myCommand = new SqlCommand("GetAnswer", _productConn); 
    myCommand.CommandType = CommandType.StoredProcedure; 
    ,yCommand.Parameters.Add(new SqlParameter("@QUESTION_ID", SqlDbType.Int)); 
    myCommand.Parameters[0].Value = QuestionId; 
    return createDataTable(getData(myCommand)); 
} 

Answer 1

您已经为您的GridView创建了一个空的DataTable作为DataSource。

更换

DataTable dt = new DataTable(); 
GetData.GetAnswerTitle(questionId); 
GridView.DataSource = dt; 

与此

DataTable dt = GetData.GetAnswerTitle(questionId); 
GridView.DataSource = dt;