Binding List to a DataGrid

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I'm using DataGird to show details. My datagrid's data source is a list. Therefore I can't use the sorting option in the grid. I use IComparable<item> in business class and use this method.

public int CompareTo(Item item)
     {
         return ItemCode.CompareTo(item.ItemCode);
     }

From this I can only sort to ItemCode. How can I improve this to sort for a given field.

Posted 5-Apr-11 22:46pm

Sanyon_d

Updated 5-Apr-11 22:49pm

TweakBird

v2

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walterhevedeich 6-Apr-11 4:59am

I cant understand the code. You passed an Item object but you are returning the ItemCode.CompareTo method. ItemCode is not passed as a parameter in the method. Is this public? Which is which?

Wayne Gaylard 6-Apr-11 5:05am

This would work if ItemCode is a Value Type, as he is just returning the CompareTo method of the Base Class.

walterhevedeich 6-Apr-11 5:12am

I see. Thanks for clarifying. :)

Sanyon_d 6-Apr-11 5:30am

public int CompareTo(Item item)
{
return this.ItemCode.CompareTo(item.ItemCode);
}

2 solutions

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Wayne Gaylard · Answer 1 · 2011-04-05T22:59:00

Solution 1

You need to create a class that implements IComparer interface. Here is a good tutorial Custom Sorting With IComparable and IComparer[^]
Hope this helps

Posted 5-Apr-11 22:59pm

Wayne Gaylard

Mahendra.p25 · Answer 2 · 2011-04-05T22:59:00

try this

MIDL

public SortDirection GridViewSortDirection
   {
       get
       {
           if (ViewState["sortDirection"] == null)
           {
               ViewState["sortDirection"] = SortDirection.Ascending;
           }
           return (SortDirection)ViewState["sortDirection"];
       }
       set
       {
           ViewState["sortDirection"] = value;
       }
   }


protected void grd_InterviewCategoryList_Sorting(object sender, GridViewSortEventArgs e)
    {
        IntervewCategory ObjIC = new IntervewCategory();

        DataTable dt = (DataTable)ObjIC.fn_getInterviewCategorylistDetails();
        DataView dv = new DataView(dt);
        if (GridViewSortDirection == SortDirection.Ascending)
        {
            GridViewSortDirection = SortDirection.Descending;
            dv.Sort = e.SortExpression + " DESC";
        }

        else
        {
            GridViewSortDirection = SortDirection.Ascending;
            dv.Sort = e.SortExpression + " ASC";
        }

        grd_InterviewCategoryList.DataSource = dv;
        grd_InterviewCategoryList.DataBind();
    }</pre>