Question

很抱歉，如果这已被覆盖致死（我注意到这个措辞有近5,000次点击）但我没有找到类似于我的例子。

我在2个地方的同一代码体中得到错误：

mygrid.SelectedItem = row.DataContext; （右键单击第一行，如果它不是％100可见）

以下是上述实际代码：

    void addMenu(DataGridRow row)
    {
        if (ctxMenu == null)
        {
            ctxMenu = new ContextMenu();
            ContextMenuTools.addMenuItem(ctxMenu, "Reschedule", true, mnu_Click);
            ContextMenuService.SetContextMenu(row, ctxMenu);
        }

        reschedItem = (Job)row.DataContext;

        try
        {
            dgrMemo.SelectedItem = reschedItem;

            ctxMenu.Tag = row;
            ctxMenu.IsOpen = true;
        }
        catch 
        {
            ctxMenu = null;
        }
    }

替换上述网格的集合中的元素

e.g。

int rpos = datasource.IndexOf(reschedItem);
reschedItem = createAnewObj();
datasource[rpos] = reschedItem; // error occurs here.....sometimes (not sure how to reproduce other than scroll the grid up and down selecting different rows and hitting the above code)

我怀疑在两种情况下都与我的数据源集合对象有关，但是由于以下情况发生了异常（对于上面的第1点），我很难理解为什么：

{System.ArgumentException: Value does not fall within the expected range.
   at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.SetValue(IManagedPeerBase obj, DependencyProperty property, Double d)
   at MS.Internal.XcpImports.SetValue(IManagedPeerBase doh, DependencyProperty property, Object obj)
   at System.Windows.DependencyObject.SetObjectValueToCore(DependencyProperty dp, Object value)
   at System.Windows.DependencyObject.SetEffectiveValue(DependencyProperty property, EffectiveValueEntry& newEntry, Object newValue)
   at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
...

价值不在预期范围内

0 个答案: