为什么以前选择的GridView项目不显示为选中状态？

Question

I have a Windows 8 App that uses a GridView to display a collection of Items. I've created the app using C# and XAML. The GridView is multi-selectable.

When the user leaves the GridView page I save which items in the grid were selected, to application state, using: navigationHelper_SaveState().

When the user returns to the GridView page I want to re-select the previously selected items.

I've confirmed that both saving and loading state work.

However, the previously selected items don't get selected when the user returns to the page. From within navigationHelper_LoadState(). I do this to select all of the previously selected items:

for (int i = 0; i < numPrevSelectedItems; i++) {    
  ItemsGridView.SelectedItems.Add(items[i]);
}

Elsewhere on StackOverflow I've read that using SelectedItems.Add() should work. However, it does not work for me. No previously selected items are visibly selected when the user returns to the page.

Interestingly enough, ItemsGridView.SelectAll(); does work.

What's the best way to get this to work properly?

Answer 1

You can do something like this:

// Get the selected rows
DataGridViewSelectedRowCollection SelectedRowsCollection = ItemsGridView.SelectedRows;

// Clear your ItemsGridView selected rows (Just for testing the following code)
ItemsGridView.ClearSelection();

// Get your previous selected rows again.
foreach (DataGridViewRow item in SelectedRowsCollection)
{
    int idx = ItemsGridView.Rows.IndexOf(item);
    ItemsGridView.Rows[idx].Selected = true;
}

Hope it helps.