Solved

ASP.Net  datatable to xml

Posted on 2009-05-07
7
346 Views
Last Modified: 2013-12-17
I keep getting an error

System.NullReferenceException: Object reference not set to an instance of an object.
   at WebService.PropertyList() in c:\Users\Amac\Amac WebIT\WebProjects\AmacCMS\App_Code\WebService.cs:line 52

wich is the return line.

Can any one help as to what i'm doing wrong.

i am looking to get the results from a table adaptor return as an xml string;

[WebMethod]
    public string PropertyList()
    {
        HotelsDataSetTableAdapters.hotelsTableAdapter hotelAdaptor = new HotelsDataSetTableAdapters.hotelsTableAdapter();
        HotelsDataSet.hotelsDataTable hotels = new HotelsDataSet.hotelsDataTable();
        hotelAdaptor.FillAllHotels(hotels);
 
        return hotels.DataSet.GetXml();
 
    }

Open in new window

0
Comment
Question by:amacleod1983
  • 4
  • 3
7 Comments
 
LVL 20

Expert Comment

by:informaniac
ID: 24325272
That's true coz Hotels.DataSet will give u null. It is not inside a dataset.

U'll have to declare a dataset and set the Table[0] of the dataset.

Then u can render the dataset to xml
0
 
LVL 3

Author Comment

by:amacleod1983
ID: 24325329
could you possible supply some sample code?
0
 
LVL 20

Expert Comment

by:informaniac
ID: 24325424
The problem is I don't know what is inside

HotelsDataSetTableAdapters

and HotelsDataSet

But this is my guess...

HotelsDataSet dsHotels = new HotelsDataSet();

hotelAdaptor.Fill(dsHotels,"hotels");

return dsHotels.GetXml();
0
MIM Survival Guide for Service Desk Managers

Major incidents can send mastered service desk processes into disorder. Systems and tools produce the data needed to resolve these incidents, but your challenge is getting that information to the right people fast. Check out the Survival Guide and begin bringing order to chaos.

 
LVL 3

Author Comment

by:amacleod1983
ID: 24325529
What would you like to know?
Capture.JPG
0
 
LVL 3

Accepted Solution

by:
amacleod1983 earned 0 total points
ID: 24326883
got it working with this

but there must be a better way
HotelsDataSetTableAdapters.hotelsTableAdapter hotelAdaptor = new HotelsDataSetTableAdapters.hotelsTableAdapter();
        HotelsDataSet.hotelsDataTable hotels = hotelAdaptor.GetAllHotels();
        StringWriter sw = new StringWriter();
        hotels.WriteXml(sw);
        return sw.ToString();

Open in new window

0
 
LVL 20

Expert Comment

by:informaniac
ID: 24327481
That would be very much fine...

HotelsDataSet what is this?
0
 
LVL 20

Expert Comment

by:informaniac
ID: 24327517
Oh sorry.. That's the dataset.....
0

Featured Post

MIM Survival Guide for Service Desk Managers

Major incidents can send mastered service desk processes into disorder. Systems and tools produce the data needed to resolve these incidents, but your challenge is getting that information to the right people fast. Check out the Survival Guide and begin bringing order to chaos.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Problem Hi all,    While many today have fast Internet connection, there are many still who do not, or are connecting through devices with a slower connect, so light web pages and fast load times are still popular.    If your ASP.NET page …
Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …

825 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question