Typed Dataset not using TypedTableBase in .NET 4

Question

I\'m migrating our DAL class library to .NET 4 (from .NET 3.5). We\'re using typed datasets quite often, and we often iterate over tables:

foreach(var row in         


        

Answer 1

The accepted answer is mostly complete, but will not fully resolve the issue.
Here's a reproduction of my question and answer on this issue.

The Problem:

In short, the problem occurs when the MSDataSetGenerator tool runs, but the System.Data.DataSetExtensions assembly has not yet been loaded into the current Visual Studio process.

The Solution:

One way to load the assembly is just to open any XSD file and THEN re-generate the designer code.

The following steps should generate the appropriate designer file:

1. Open any XSD file to the designer view (this loads DataSetExtensions.dll)
2. Right Click on the XSD and Select Run Custom Tool

Here's a full step by step walkthrough of the issue and solution with pictures

Other Instances:

This problem has also been reported to Microsoft in the following bug tickets:

• #668724 - MSDataSetGenerator generates incorrect output sometimes
• #733077 - MSDataSetGenerator does not generate TypedTableBase derived classes

Answer 2

Just ran into this today and was able to correct it by doing the following:

Select the xsd files in the solution explorer and click "Run Custom Tool". The designer files will be regenerated using TypedTableBase instead of DataTable and IEnumerable.

Answer 3

All this is correct but in my case I had to support source code which needs to run with .Net 2.0 and .Net 4.0. My objective was to change as little code as possible.

My solution was to create a partial extension under .Net 4.0 and bind it to the 4.0 application. This looks like:

namespace NamespaceOfMyDataSet
{
    public partial class MyDataSet : global::System.Data.DataSet 
    {
        public partial class MyTypedTable : global::System.Data.TypedTableBase<MyTypedTableRow> 
        {
            public System.Data.DataRowCollection GetRows()
            {
                return this.Rows;
            }
        }
    }
}

This works like a charme!!!