How to return a DataSet to a View

Question

I am sending a standard Sql select statement to my Sql box via the SqlDataAdapter, then populating a DataSet object.

I can access the rows in the resulting DataSet,

Answer 1

If you're stuck with using DAO, I would suggest not using a DataSet and instead use a strongly typed class with the speed of SqlDataReader.GetValues() method. It's more work, but it has to be done somewhere if you want strongly typed classes which I would highly recommend.

public class Person
{
  public Person(Object[] values]
  {
    this.FirstName = (string)values[0];
    this.LastName = (string)values[1];
    this.Birthday = (DateTime)values[2];
    this.HasFavoriteColor = (bool)values[3];
  }

  public string FirstName { get; private set; }
  public string LastName { get; private set; }
  public DateTime Birthday { get; private set; }
  public bool HasFavoriteColor { get; private set; }
}

public static void DbRegressionExec()
{
    List<Person> viewModel = new List<Person>();

    // SELECT TABLE CONTENTS FROM SQL !!
    RegressDB_TableList regresDB = new RegressDB_TableList();
    string sqlStr = "select
        FirstName
        ,LastName
        ,Birthday
        ,HasFavoriteColor
      from [RegressionResults].[dbo].[Diff_MasterList] 
      order by TableName";

    // POPULATE VIEWMODEL OBJECT
    sqlConn.Open();

    try
    {
      using (SqlCommand com = new SqlCommand(sqlStr, sqlConn))
      {
        using (SqlDbReader reader = com.ExecuteReader())
        {
          while(reader.Read())
          {
            viewModel.Add(new Person(com.GetValues()));
          }
        }
      }
    }
    catch (Exception e)
    {
        throw;
    }
    finally
    {
        sqlConn.Close();
    }

    return this.View(viewModel);
}

Answer 2

In your controller put the code like this

[HttpGet]
public ActionResult View(Modelclass viewmodel)
{
    List<Modelclass> employees = new List<Modelclass>();
    DataSet ds = viewmodel.GetAllAuthors();
    var empList = ds.Tables[0].AsEnumerable().Select(dataRow => new Modelclass{
       AuthorId = dataRow.Field<int>("AuthorId"),
        Fname = dataRow.Field<string>("FName"),
       Lname = dataRow.Field<string>("Lname")
    });
    var list = empList.ToList();



    return View(list);
}

And in view

@{
var gd = new WebGrid(Model, canPage: true, rowsPerPage: 5, selectionFieldName: "selectedRow",ajaxUpdateContainerId: "gridContent");
    gd.Pager(WebGridPagerModes.NextPrevious);}
@gd.GetHtml(tableStyle: "table",

        columns: gd.Columns(
                 gd.Column("AuthorId", "AuthorId"),
                 gd.Column("Fname", " Fname"),
                 gd.Column("Lname", "Lname", style: "description")

 )) 

Answer 3

Short answer

Directly answering your question:

var tableList = new List<RegresDB_TableName>();
int numRows = ds.Tables["RegresDB"].Rows.Count;
for (int i = 0; i < numRows; i++)
{
    string tblName = ds.Tables["RegresDB"].Rows[i].Field<string>("TableName");
    tableList.Add(new RegresDB_TableName() { TableName = tblName };
}

return View(tableList);

Long answer (that's actually shorter)

Try out dapper-dot-net.

Your code could change to something like:

string sqlStr = "SELECT * FROM [RegressionResults].[dbo].[Diff_MasterList] ORDER BY TableName";
return sqlConn.Query<RegresDB_TableName>(sqlStr);

Answer 4

Controller code

 //pQ is your query you have created 
 //P4DAL is the key name for connection string 

  DataSet ds = pQ.Execute(System.Configuration.ConfigurationManager.ConnectionStrings["Platform4"].ConnectionString);


  //ds will be used below
  //create your own view model according to what you want in your view 
 //VMData is my view model

 var _buildList = new List<VMData>();
            {
                foreach (DataRow _row in ds.Tables[0].Rows)
                {
                    _buildList.Add(new VMData
                    {  
     //chose what you want from the dataset results and assign it your view model fields 

                        clientID = Convert.ToInt16(_row[1]),
                        ClientName = _row[3].ToString(),
                        clientPhone = _row[4].ToString(),
                        bcName = _row[8].ToString(),
                        cityName = _row[5].ToString(),
                        provName = _row[6].ToString(),
                    });



                }

            }

  //you will use this in your view
  ViewData["MyData"] = _buildList;

View

@if (ViewData["MyData"] != null)
{

    var data = (List<VMData>)ViewData["MyData"];
    <div class="table-responsive">
        <table class="display table"  id="Results">

            <thead>
                <tr>
                    <td>Name</td>
                    <td>Telephone</td>
                    <td>Category </td>
                    <td>City </td>
                    <td>Province </td>

                </tr>
            </thead>

            <tbody>
                @foreach (var item in data)
                {
            <tr>
                <td>@Html.ActionLink(item.ClientName, "_Display", new { id = item.clientID }, new { target = "_blank" })</td>
                <td>@item.clientPhone</td>
                <td>@item.bcName</td>
                <td>@item.cityName</td>
                <td>@item.provName</td>

            </tr>

            }
            </tbody>


        </table>
        </div>
        }