Question

Question on Web Service which returns the DataTable

Asked by: chuang4630

I am creating a web method which returns a DataTable. Here is the code:

private DataTable Order;
private DataColumn OrderCol;
private DataRow DataRow;

private DataTable AssignOrder(string OrderNum)
{
   this.Order = new DataTable("OrderStatus");
   this.OrderCol = Order.Columns.Add("OrderNum", typeof(string));
   OrderCol.AllowDBNull = false;
   OrderCol.Unique = true;
   Order.Columns.Add("OrderStatus", typeof(string));
   this.OrderRow = Order.NewRow();
   OrderRow["OrderNum"] = OrderNum;
   OrderRow["OrderStatus"] = "SHIPPED";
   Order.Rows.Ass(OrderRow);

   return Order;
}

[WebMethod()]
public DataTable GetOrderStatus(string OrderNum)
{
   DataTable OrderStatus = AssignOrder(OrderNum);
   return OrderStatus;
}

The compilation is successful. However, when I test the web service, it shows the error when I tried to bring up the web service list (access //localhost/WebService1/Service1.asmx):

Cannot serialize member System.ComponentModel.marshalByValueComponent.Site of type System.ComponentModel.ISite because it is an interface.

Actually, sorting through the stack, I found the there is an error "method Service1.GetOrderStatus can not be reflected.".

Is there anyoine can figure what's wrong with it?
Thanks in advance.

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Asked On
2005-03-14 at 17:24:26ID21350747
Tags

datatable

,

web

,

service

,

return

Topic

.NET

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: testnPosted on 2005-03-14 at 19:20:39ID: 13541455

datatable cannot be serialized into xml. Please consider to use DataSet instead.

 

by: chuang4630Posted on 2005-03-14 at 21:23:12ID: 13541861

Is Collection serialized?

 

by: onlyamir007Posted on 2005-03-14 at 22:13:09ID: 13542012

The DataTable, DataRow, DataView, and DataViewManager objects cannot be serialized and cannot be returned from an XML Web service. To return less than a complete DataSet, you must copy the data that you want to return to a new DataSet.

Please read the following URL from microsoft site

http://support.microsoft.com/default.aspx?scid=kb;EN-US;q306134

I think so it will be helpful for you.

Cheers
Amir

20120131-EE-VQP-002

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