Question

History: I have a small site in PHP which I wanted to make a better front end for. Having looked around, spending an hour or so on each of FlashBuilder etc., I found Silverlight 4 the quickest to get moving with, but I have hit an issue.

I have a class for simplicity

 public partial class data
        {
            public String Software;
            public int OK;
            public int warn;
            public int falsepos;
            public int failed;
            public int total;
        }

I then load the class using a call to my service going something like:

    [OperationContract]
    public List<data> GetSum(){
     String sql="SELECT Software, OK, warn, falsepos, failed from sum";
        List<data> res = new List<data>();
            if (!DBConnect()) { throw new Exception("Unable to contact Database"); }

            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = new SqlCommand(sql, _sqlConnection);
            DataSet ds = new DataSet();
            da.Fill(ds);
            _sqlConnection.Close();
            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                data d = new data();
                d.Software = dr["software"].ToString();
                d.OK  = Int16.Parse(dr["OK"].ToString());
                d.warn  = Int16.Parse(dr["Warning"].ToString());
                d.falsepos = Int16.Parse(dr["False Positive"].ToString());
                d.failed = Int16.Parse(dr["Failed"].ToString());
                d.total = d.OK+d.warn+d.falsepos+d.failed;
                res.Add(d);
            }
            return res;}

Now, that compiles fine, except, the moment I add the foreach, it starts falling apart,

private void Summary(object Sender, ServiceProxy.GetSumCompletedEventArgs e)
{
    foreach (data d in e.Result)
    {

    }
}

The moment I go to parse through the list as a result, it says

Error    2    foreach statement cannot operate on variables of type 'SilverlightApplication1.ServiceProxy.GetSumResponse' because 'SilverlightApplication1.ServiceProxy.GetSumResponse' does not contain a public definition for 'GetEnumerator'    C:\Users\me\Documents\Visual Studio 2010\Projects\SilverlightApplication1\SilverlightApplication1\Page1.xaml.cs    52    13    SilverlightApplication1

Now, I’ve looked around and read and seen a number of things, now, a very very similar function which just returns a list of servernames, works. Because I guess it’s of type String, however, I understand it’s not generated the how to read the single item within the list, but this is bugging me. I just want to return a simple list of stuff. Can someone please point me in the right direction?

I’m sure it’s something simple. Like an attribute, or something, but this seems silly that I can’t find the answer, be kind, I’ve only been looking at Silverlight for a couple of hours.

Answer 1

Following the lines of this answer

You can try

[DataContract]
public class DataResult
{
    [DataMember]
    public List<data> DataList{ get; set; }

    DataResult(List<data> dataList)
    { 
        DataList = dataList;
    }

}

[OperationContract]
public List<data> GetSum(){
    ...
    ...

    return DataResult(res);
}



private void Summary(object Sender, ServiceProxy.GetSumCompletedEventArgs e)
{
    foreach (data d in e.Result.DataList)
    {

    }          
}

and to display the list to a grid, you can do

DataGrid1.ItemsSource = e.Result.DataList;

and that should do it if your columns are configured properly or set to auto generate.