Multiple Connections between two web parts in sharepoint

Question

I am new to sharepoint. I don't know if this is possible or not. I have two web parts, one has two values which I need to pass to the second web part. Is there any way doing that or I can only have one connection/ Thanks

I have two visual web parts. In Provider I have two dropdownlists which I need to pass the values to Consumer. Here is the code:

public interface IMyConnection { int AreaId { get; } int TopicId { get; } }

public class Provider : WebPart, IMyConnection
{
    private Control control;

    protected override void CreateChildControls()
    {
        control = Page.LoadControl(_ascxPath);
        Controls.Add(control);
        base.CreateChildControls();
    }

    public int AreaId
    {
        get { return 1; }
    }

    public int TopicId
    {
        get { return 2; }
    }

    [ConnectionProvider("TopicId", "TopicId", AllowsMultipleConnections = true)]
    public IMyConnection SetTopicConnection()
    {
        return this;
    }

    [ConnectionProvider("AreaId", "AreaId", AllowsMultipleConnections = true)]
    public IMyConnection SetAreaConnection()
    {
        return this;
    }
}

public class Consumer : WebPart
{
    private IMyConnection connection;
    private Control control;

    protected override void CreateChildControls()
    {
        control = Page.LoadControl(_ascxPath);
        Controls.Add(control);
    }

    [ConnectionConsumer("TopicId", "TopicId", AllowsMultipleConnections = true)]
    public void GetTopicConnection(IMyConnection theConnection)
    {
        connection = theConnection;
    }

    [ConnectionConsumer("AreaId", "AreaId", AllowsMultipleConnections = true)]
    public void GetAreaConnection(IMyConnection theConnection)
    {
        connection = theConnection;
    }

    protected override void RenderContents(HtmlTextWriter writer)
    {
        if (connection != null)
        {
            //do work
        }
        base.RenderContents(writer);
    }
}

When I try to set the connections, it doesn show both but only set the Topic connection.

Eric Eric · Accepted Answer · 2011-03-04T20:58:02

One solution might be to split up your interface into IAreaProvider and ITopicProvider. I think the two connections aren't showing up because you can't provide two connections for the same interface.

Multiple Connections between two web parts in sharepoint

2 Answers