CODEWITHSUNDEEP
asp.net
andleer
andleer

Reputation: 22568

Simplified Object Data Source Control

Is there any simplified Data Source Control that would allow binding to a local (code behind) page method? Any way to accomplish this with an ODS?

The ODS requires the TypeName parameter which I can't figure out to to point to the local page (code behind) in a Web Site Project.

<asp:DropDownList ID="DropDownListMain" runat="server" DataTextField="Text" DataValueField="Value"
    DataSourceID="DataSourceMain" />
<asp:ObjectDataSource ID="DataSourceMain" runat="server" SelectMethod="GetMyRecords" />

   protected IEnumerable<MyRecord> GetMyRecords()
    {
        yield return new MyRecord("Red", "1");
        yield return new MyRecord("Blue", "2");
        yield return new MyRecord("Green", "3");
        yield return new MyRecord("Black", "4");
    }

    protected class MyRecord
    {
        public MyRecord(string text, string value)
        {
            this.Text = text;
            this.Value = value;
        }

        public string Text { get; set; }
        public string Value { get; set; }
    }

Upvotes: 2

Views: 294

Answers (2)

andleer
andleer

Reputation: 22568

Not fully tested but this does work. I need to test with UserControls and MasterPages. So, yes, it can be done:

public class LocalDataSource : LinqDataSource
{
    public LocalDataSource()
    {
        this.Selecting += (sender, e) =>
        {
            var instance = GetHost(this.Parent);

            e.Result = instance.GetType().InvokeMember(SelectMethod, BindingFlags.Default | BindingFlags.InvokeMethod, null, instance, null);
        };
    }

    public string SelectMethod
    {
        get { return (string)ViewState["SelectMethod"] ?? string.Empty; }
        set { ViewState["SelectMethod"] = value; }
    }

    private object GetHost(Control control)
    {
        if (control.Parent is System.Web.UI.Page)
            return control.Parent;

        if (control.Parent is System.Web.UI.UserControl)
            return control.Parent;

        if (control.Parent != null)
            return GetHost(control.Parent);

        return null;
    }
}

Markup on the page:

<asp:DropDownList ID="DropDownList1" runat="server" DataTextField="Name" DataValueField="ID"
    DataSourceID="DataSource1" />
<ph:LocalDataSource id="DataSource1" runat="server" SelectMethod="GetNames" />

Code on the page:

public IEnumerable<NameRecord> GetNames()
{
    yield return new NameRecord("Andy", "1");
    yield return new NameRecord("Chad", "2");
    yield return new NameRecord("Jayson", "3");
}

public class NameRecord
{
    public NameRecord(string name, string id)
    {
        this.Name = name;
        this.ID = id;
    }

    public string Name { get; set; }
    public string ID { get; set; }
}

Upvotes: 1

Franci Penov
Franci Penov

Reputation: 75982

You can't do this with an ObjectDataSource control. You can do it in the code behind though, by setting the DataSource property of the DropDownList to your object and calling DataBind().

Upvotes: 1

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