HTML5 Report Viewer - Using Models - Part two

[steve]

Trying to follow this original thread:http://www.telerik.com/forums/asp-net-mvc4-using-pass-model-to-objectdatasource#n3Sejx7cSEKjJ3clQNeH7w which is closed.

 

I modified the mvc project to display the ListBoundReport directly, using a custom resolver.

 

public class CustomReportResolver : IReportResolver
    {
        ReportSource IReportResolver.Resolve(string report)
        {
          
            var nreport = new ListBoundReport();

            var ds = new Cars().GetRange(1, 2);

            nreport.DataSource = ds;
            var irs = new InstanceReportSource { ReportDocument = nreport };
 
            return irs;
        
        }
    }

 

This displays the same 7 original cars

            nreport.DataSource = null; did not clear the items

If I remove the datasource from the report (objectDataSource1.DataSource) It will display two records, but both will be blank (not tied to the values).

Please explain both behaviors:

1. Why setting the Datasource has no effect

2. Why after removing Datasource from report only works half way (not bound to fields)

And what we need to do to get this to work correctly

Thanks, 

Steve

 

[steve]

update to this.

 

When doing as in this sample code you actually get seven items on two pages instead of one.

[Katia]

Hi Steve,

When a report has inner data items their DataSource properties need also to be set. Data items will not reuse the report's data source by default.

In ListBoundReport report, the data fields are placed in a List item. If you want to change its DataSource property in a custom report resolver it can be achieved as following:

ReportSource IReportResolver.Resolve(string report)
        {

            var nreport = new ListBoundReport();

            var ds = new Cars().GetRange(1, 2);

            //nreport.DataSource = ds;
            List listItem = (List)nreport.Items.Find("list1", true)[0];
            listItem.DataSource = ds;

            var irs = new InstanceReportSource { ReportDocument = nreport };

            return irs;

        }

You can also check Changing the connection string dynamically according to runtime data KB article that provides an example of how to iterate over DataSource properties of inner data items in order to change them at runtime.

When you set a DataSource property of both report and data item, the data will be repeated (Data Binding Problems) as the list item will be repeated for each data row from the report's data source.
To avoid this, set only the inner data item's DataSource property or reuse the parent's (report's) data source as described in Binding a Data item to Data help article.


I hope this information will help.

Regards,
Katia
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