I can't get my SharePoint ListItem Fields

I want to show all fields of a certain ListItem. This includes LookUpFields and ChoiceFields. But I only seem to be able to show Textfields, like Title. How can I show all fields of my ListItem? The problem is that I get an error when I try to show other fields of a listitem the way I got 'Title' to show, as if the strings I type in don't exist as fields in that listitem. But they do exist and are populated with values! What is good way to show custom fields of a listitem without getting ObjectReference errors? Also I get this error: The given key was not present in the dictionary.

    private void foo()
    {
        using (ClientContext context = new ClientContext(ApplicationContext.Current.Url))
        {
            _list = context.Web.Lists.GetByTitle("MyList").Title);
            _items = _list.GetItems(CamlQuery.CreateAllItemsQuery());
            context.Load(_items);
            context.ExecuteQueryAsync(
                new ClientRequestSucceededEventHandler(OnListItemsRequestSucceeded),
                new ClientRequestFailedEventHandler(OnListItemsRequestFailed));
        }
    }
private void OnListItemsRequestSucceeded(Object sender, Cli开发者_开发百科entRequestSucceededEventArgs args)
    {
        // this is not called on the UI thread
        Dispatcher.BeginInvoke(ShowListItemDetails);
    }
public void ShowListItemDetails()
    {
foreach (ListItem i in _items)
        {
TextBox_Details.Text += i["Title"].ToString() + Environment.NewLine;
// Now the rest of the fields of this item.
        }
}

Edit: What also is a big problem is I cant get the debugger working. This code is running as a Silverlight webpart on a local Sharepoint site. I attach the debugger to the iexplorer.exe but it won't break. If I could get the debugger to work it would be a great help indeed.

you have tell the query what all fields you need to pull from lists

CamlQuery camlQuery = new CamlQuery();
            camlQuery.ListItemCollectionPosition = itemPosition;
            camlQuery.ViewXml =
                @"<View>
                    <ViewFields>
                      <FieldRef Name='Title'/>
                      <FieldRef Name='Category'/>
                      <FieldRef Name='Estimate'/>
                    </ViewFields>
                    <RowLimit>10</RowLimit>
                  </View>";
            ListItemCollection listItems = list.GetItems(camlQuery);
            clientContext.Load(listItems);
            clientContext.ExecuteQuery();

for more details

http://msdn.microsoft.com/en-us/library/ee857094.aspx#SP2010ClientOM_Accessing_Large_Lists

To get item properties you will need to specify all the item properties you need in the second parameter of the ClientContext.Load method

e.g

        string server = "http://localhost";
        ClientContext context = new ClientContext(server);
       Web web = context.Web;
        var spList = web.Lists.GetByTitle("MyTitle");
        CamlQuery query = new CamlQuery();
        var items = spList.GetItems(query);
        context.Load(items, 
            itema => itema.Include(
                item => item,
                item => item["ComplexProperty"]));
        context.ExecuteQuery();`