CODEWITHSUNDEEP
c#asp.netlinq
user1741874
user1741874

Reputation:

LINQ to XML binding to asp.Net DropDownList

I'm trying to use LINQ and so I can bind it to an ASP.NET dropdown.

So far; this is what I have in terms of my LINQ expression; I'm new to LINQ, I started learning it this morning. 

 county.DataSource = (from taxUnit in TaxUnits.Descendants("CodeData")
    join taxType in TaxTypes.Descendants("CodeData")
      on
      taxUnit.Attribute("taxuntype").Value
      equals
      taxType.Attribute("codeid").Value
    where taxType.Attribute("taxuntypky").Value == "CO"
    select new
    {
      County = taxUnit.Attribute("desc"),
      CodeID = taxUnit.Attribute("codeid")
    });

  county.DataTextField = "desc";
  county.DataValueField = "codeid";

  county.DataBind();

Originally I was trying to convert it into a datatable; I've been informed you can actually do direct LINQ to DropDownList binding.

          <asp:Label AssociatedControlID="county" runat="server">County</asp:Label>
          <asp:DropDownList
            ID="county"
            runat="server" />

So far the result is... when I look at the dropdown box. Based on what I'm getting from LINQPad I expect

County CodeID 
Willow County 1 
CP2 TU 2

The only problem with the current answer is I have no idea how it works, thus I do not understand how to convert it to what I want.

I was previously able to use an ObjectDataSource that pointed to this method, and made a mock for List just to play with databinding.

Upvotes: 3

Views: 496

Answers (1)

abatishchev
abatishchev

Reputation: 100288

If the actual question is - how to bind LINQ to XML result onto a DropDownList then here's a code from my old ASP.NET project. I bind LINQ to Entities result onto GridView. For DropDownList should work same way:

public IEnumerable<IDraft> Get(int accountId, DateTime startDate, DateTime endDate)
{
    using (var db = new ModelContainer())
    {
        var account = db.Accounts.SingleOrDefault(a => a.ID == accountId);
        return (from d in account.Drafts
                let date = d.Date.Date
                where startDate.Date <= date && date <= endDate.Date
                orderby d.Date ascending
                select d).ToArray();
    }
}

protected void gridView_OnDataBinding(object sender, EventArgs e)
{
    ((IDataBoundControl)sender).DataSource = IoC.Resolve<IOperationRepository>().GetShared(this.ObjectId.Value, ucChooseDate.StartDate, ucChooseDate.EndDate);
}

Upvotes: 1

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