如何解决GridView数据源中缺少字段?
| 我正在加载带有对象列表的gridview,但无法调用aspx页面上的某些嵌套属性。我知道列表包含它们,并且可以返回它们,因为我已经使用了print方法来调用有问题的几个属性。具体细节:提交对象包含嵌套对象Cust,Bro和SubCoverage,它们每个都有自己的属性,我将它们存储在列表中并尝试调用gridview。 Submission对象本身的属性显示得很好,但是当我调用Cust对象的CustName1属性时,它的\“在所选数据源上找不到字段\”。由于我知道数据存在,并且可以被后面的代码中的其他方法调用,因此我假设它是一种简单的语法,但是我已经尝试了足够的迭代以使我怀疑是否存在某些东西不见了。它是什么?代码如下: //提交类/对象:public class Submission
{
private int SubmissionId;
public int SubmissionId1
{
get { return SubmissionId; }
set { SubmissionId = value; }
}
private string Status;
public string Status1
{
get { return Status; }
set { Status = value; }
}
private string StatusComment;
public string StatusComment1
{
get { return StatusComment; }
set { StatusComment = value; }
}
private List<Product> Products = new List<Product>();
public List<Product> Products1
{
get { return Products; }
set { Products = value; }
}
private Customer Cust;
public Customer _Cust
{
get { return Cust; }
set { Cust = value; }
}
private Broker Bro;
public Broker _Bro
{
get { return Bro; }
set { Bro = value; }
}
private SubmissionCoverage Subcov;
public SubmissionCoverage _SubCov
{
get { return Subcov; }
set { Subcov = value; }
}
public Submission()
{
Cust = new Customer();
Bro = new Broker();
Subcov = new SubmissionCoverage();
}
}
//客户之一的嵌套对象类:
public class Customer
{
private int CustId;
public int CustId1
{
get { return CustId; }
set { CustId = value; }
}
private string CustName;
public string CustName1
{
get { return CustName; }
set { CustName = value; }
}
private string CustAddress;
public string CustAddress1
{
get { return CustAddress; }
set { CustAddress = value; }
}
private string CustState;
public string CustState1
{
get { return CustState; }
set { CustState = value; }
}
private string CustCity;
public string CustCity1
{
get { return CustCity; }
set { CustCity = value; }
}
private int CustZip;
public int CustZip1
{
get { return CustZip; }
set { CustZip = value; }
}
private int SicNaic;
public int SicNaic1
{
get { return SicNaic; }
set { SicNaic = value; }
}
}
//查询/列表数据层:
Submission tempSubmission = new Submission();
while (dr.Read())
{
tempSubmission = new Submission();
tempSubmission.SubmissionId1 = dr.GetInt32(0);
tempSubmission._Cust.CustName1 = dr.GetString(1);
tempSubmission._Cust.CustCity1 = dr.GetString(2);
tempSubmission._Cust.CustState1 = dr.GetString(3);
tempSubmission._Bro.BroName1 = dr.GetString(4);
tempSubmission._Bro.BroState1 = dr.GetString(5);
tempSubmission._Bro.Entity1 = dr.GetString(6);
tempSubmission._SubCov.Coverage1 = dr.GetInt32(7);
tempSubmission.Status1 = dr.GetString(8);
lstSubmission.Add(tempSubmission);
}
return lstSubmission;
}
}
// gridview代码:
<asp:GridView ID=\"GridView2\" runat=\"server\" AutoGenerateColumns=\"false\" EmptyDataText=\"There are no data records to display.\" AllowPaging=\"True\"
BackColor=\"White\" BorderColor=\"#999999\" BorderStyle=\"None\" BorderWidth=\"1px\"
CellPadding=\"3\" GridLines=\"Vertical\" HorizontalAlign=\"Center\"
AllowSorting=\"True\" >
<AlternatingRowStyle BackColor=\"#DCDCDC\" />
<Columns>
<asp:BoundField DataField=\"SubmissionId1\" HeaderText=\"Submission Id\"
SortExpression=\"SubmissionId1\" >
</asp:BoundField>
<asp:BoundField DataField=\"_Cust.CustName1\" HeaderText=\"Customer\"
SortExpression=\"tempsub._Cust.CustName1\" />
<asp:BoundField DataField=\"CustCity1\" HeaderText=\"Customer City\"
SortExpression=\"CustCity1\" />
<asp:BoundField DataField=\"CustState1\" HeaderText=\"Customer State\"
SortExpression=\"CustState1\" />
<asp:BoundField DataField=\"BroName1\" HeaderText=\"Broker\"
SortExpression=\"BroName1\" />
<asp:BoundField DataField=\"BroState1\" HeaderText=\"Broker State\"
SortExpression=\"BroState1\" />
<asp:BoundField DataField=\"Entity1\" HeaderText=\"Entity Type\"
SortExpression=\"Entity1\" />
<asp:BoundField DataField=\"Coverage\"
HeaderText=\"Coverage\" SortExpression=\"Coverage\"
DataFormatString=\" {0:c}\" />
<asp:BoundField DataField=\"Status1\" HeaderText=\"Status\"
SortExpression=\"Status1\" />
<asp:HyperLinkField DataNavigateUrlFields=\"SubmissionId\"
DataNavigateUrlFormatString=\"View.aspx?SubmissionId={0}\" Text=\"View\"
HeaderText=\"View\" />
<asp:HyperLinkField DataNavigateUrlFields=\"SubmissionId\"
DataNavigateUrlFormatString=\"ViewEdit.aspx?SubmissionId={0}\" HeaderText=\"Edit\"
Text=\"Edit\" />
</Columns>
</asp:GridView>
//最后,表示层中的print方法证明我并不疯狂:
SubmissionService ss = new SubmissionService();
List<Submission> SubmissionsList = ss.getAllSubmission();
GridView2.DataSource = SubmissionsList;
GridView2.DataBind();
Submission tempsub = SubmissionsList.First();
Response.Write(\"Printing temp:\" + tempsub._Cust.CustName1 + \" total count is:\" + SubmissionsList.Count() ); // *This returns the correct data for whichever field I specify.*
解决方法
试试看这里:
http://www.dailycode.info/Blog/post/2009/01/11/ASPNet-GridView-databinding-a-subobject.aspx
这篇文章中的关键是使用带有标签的TemplateField:
<asp:TemplateField HeaderText=\"Stock location description\">
<ItemTemplate>
<asp:Label ID=\"lblCRCID\" runat=\"server\"
Text=\'<%# ((Namespace.TestStock)(Container.DataItem)).StockLocation.Description %>\'>
</asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField=\"Description\" HeaderText=\"Stock descrioption\" />
高温超导
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