Sorting by multiple fields using DisplayColumnAttribute in Asp.Net Dynamic Data App?

I've got a dynamic data app, and I want to sort based on multiple fields like so..

开发者_JS百科<DisplayColumn("FieldName", "Field1, Field2")> _

DisplayColumn doesn't seem to support more than one field?

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The DisplayColumn attribute's SortColumn param specifies the column that will be used to sort this entity when it is used as a foreign key (ex: in a DropDownList), not when it is being sorted in the GridView (or being sorted in the DB).

see SO here as well: ASP.NET Dynamic Data DisplayColumn Attribute Causing Sorting Issue

msdn: http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.displaycolumnattribute.aspx

If this is still what you are looking for (sorting in DropDownLists only, not the DB) you can sort on multiple columns by creating a custom property in the entity that combines those two columns.

example:

[DisplayColumn("FieldName", "SortColumn")]
public partial class Employee
{
    public string SortColumn
    {
        get { return Field1 + Field2; }
    }
}

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If you want to sort gridview on multiple columns then this is how you can do -

In Page Template\List.aspx.cs & in Page_Laod event check for table name

if (!Page.IsPostBack) {
if (table.Name == "Project")
{

GridView1.Sort("ClientDetail.CompanyName asc,ProjectName asc", SortDirection.Ascending);

}

}

and you can also provide order either ascending or descending for each column.

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Yes it does support multiple field. You can try this:

[DisplayColumn("FieldName", "Field1 ASC, Field2 DESC, Field3")]

Then in Page_Load of List.aspx:

var displayColumn = table.GetAttribute<DisplayColumnAttribute>();
if (displayColumn != null && displayColumn.SortColumn != null)
{
    GridView1.Sort(displayColumn.SortColumn,
    displayColumn.SortDescending ? SortDirection.Descending : SortDirection.Ascending);
}