System.InvalidOperationException: ‚Artikel Sammlung muss vor der Verwendung Itemssource leer sein.‘

stimmen
0

Ich hoffe, dass jemand auf diese mit einem frischen Paar Augen sehen kann, wie ich es nicht sehen kann.

Der Fehler, den ich bekommen ist: System.InvalidOperationException: ‚Items-Auflistung muss vor der Verwendung Itemssource leer sein‘

Weitere Beiträge hier auf Stackoverflow vorschlagen, ein Auge auf Gridviewcolumn und GridViewColumn.CellTemplate sowie die Datatemplate zu halten. Es scheint korrekt zu sein, suchen und gehofft, dass Sie etwas sehen, kann ich nicht.

Unten ist die C #. Die Fehlermeldung über tatsächlich bereitgestellt verweist auf die .ItemsSource unten - aber ich brauche diese:

private void RefreshList()
    {
        lstoList.ItemsSource = oList;
        oList.Clear();
        foreach (var offVar in db.O)
        {
            oList.Add(offVar);
        }
        lstoList.Items.Refresh();
    }

Unten ist die XAML:

<Page x:Class=LApplication.p
  xmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentation
  xmlns:x=http://schemas.microsoft.com/winfx/2006/xaml
  xmlns:mc=http://schemas.openxmlformats.org/markup-compatibility/2006 
  xmlns:d=http://schemas.microsoft.com/expression/blend/2008 
  xmlns:local=clr-namespace:LApplication
  mc:Ignorable=d 
  Loaded=Page_Loaded
  d:DesignHeight=500 d:DesignWidth=900
  Title=p>

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height=200 />
        <RowDefinition Height=* />
        <RowDefinition Height=* />
    </Grid.RowDefinitions>

    <!--<StackPanel>-->
        <TabControl Height=200>
            <TabItem Header=L Applicants>
                <Grid>
                    <Grid.ColumnDefinitions>

                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height=50*/>
                        <RowDefinition Height=*/>
                        <RowDefinition Height=*/>
                        <RowDefinition Height=*/>
                    </Grid.RowDefinitions>

                    <ListView Name=lstoList Grid.Row=0 Grid.ColumnSpan=1 SelectionChanged=lstoList_SelectionChanged>
                        <ListView.View>
                                        <GridView>
                                            <GridViewColumn Header=UserId Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding UserId} ></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>

                                            <GridViewColumn Header=QuoteId Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding QuoteId}></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>
                                            <GridViewColumn Header=oAmount Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding oAmount}></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>

                                            <GridViewColumn Header=Term Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding Term} ></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>

                                            <GridViewColumn Header=IRate Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding IRate}></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>

                                            <GridViewColumn Header=FirstName Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding FirstName}></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>

                                            <GridViewColumn Header=LastName Width=120 >
                                                    <GridViewColumn.CellTemplate>
                                                        <DataTemplate>
                                                            <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding LastName}></TextBlock>
                                                        </DataTemplate>
                                                    </GridViewColumn.CellTemplate>
                                            </GridViewColumn>

                                            <GridViewColumn Header=datetime Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding datetime}></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>

                                            <GridViewColumn Header=oStatusId Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding oStatusId}></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>

                                            <GridViewColumn Header=pName Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding pName}></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>

                                            <GridViewColumn Header=CompanyReg Width=120 >
                                                <GridViewColumn.CellTemplate>
                                                    <DataTemplate>
                                                        <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding CompanyReg}></TextBlock>
                                                    </DataTemplate>
                                                </GridViewColumn.CellTemplate>
                                            </GridViewColumn>
                                        </GridView> 
                        </ListView.View>

                        <!--Enables right click-->
                        <ListView.ContextMenu>
                            <ContextMenu Name=UserListOverview IsEnabled=True>
                                <ContextMenu.Items>
                                    <MenuItem Header=Add New o Name=submenuAddo IsEnabled=True Click=submenuAdd_Click>
                                        <MenuItem.Icon>
                                            <Image Source=Images/add.png Stretch=Uniform></Image>
                                        </MenuItem.Icon>
                                    </MenuItem>
                                    <MenuItem Header=Update Selected o Name=submenuModifyo IsEnabled=True >
                                        <MenuItem.Icon>
                                            <Image Source=Images/update.png Stretch=Uniform></Image>
                                        </MenuItem.Icon>

                                    </MenuItem>

                                    <MenuItem Header=Remove Selected o Name=submenuDeleteo IsEnabled=True>
                                        <MenuItem.Icon>
                                            <Image Source=Images/remove.png Stretch=Uniform></Image>
                                        </MenuItem.Icon>
                                    </MenuItem>
                                </ContextMenu.Items>

                            </ContextMenu>

                        </ListView.ContextMenu>
                        <ScrollBar x:Name=scrollBar Height=100 Width=500/>
                    </ListView>

                </Grid>
            </TabItem>

            <TabItem Header=p Logs>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width=1200*/>
                        <ColumnDefinition Width=*/>
                        <ColumnDefinition Width=*/>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height=400/>
                        <RowDefinition Height=50*/>
                    </Grid.RowDefinitions>

                    <ListView Name=lstpList Grid.Row=0 Grid.ColumnSpan=2>
                        <ListView.View>
                            <GridView>
                                <GridViewColumn Header=UserId Width=120 >
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding UserId} ></TextBlock>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                </GridViewColumn>

                                <GridViewColumn Header=datetime Width=120 >
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding datetime} ></TextBlock>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                </GridViewColumn>

                                <GridViewColumn Header=oAmount Width=120 >
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding oAmount}></TextBlock>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                </GridViewColumn>

                                <GridViewColumn Header=Term Width=120 >
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding Term}></TextBlock>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                </GridViewColumn>

                                <GridViewColumn Header=Action Width=120 >
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding Action}></TextBlock>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                </GridViewColumn>

                                <GridViewColumn Header=AffIntRate Width=120 >
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding AffIntRate}></TextBlock>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                </GridViewColumn>

                                <GridViewColumn Header=RpmtIntRate Width=120 >
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding RpmtIntRate}></TextBlock>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                </GridViewColumn>

                                <GridViewColumn Header=oStatusId Width=120 >
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock HorizontalAlignment=Stretch TextWrapping=Wrap Text={Binding oStatusId}></TextBlock>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                </GridViewColumn>

                            </GridView>
                        </ListView.View>
                    </ListView>
                </Grid>
            </TabItem>
            <ScrollBar x:Name=scrollBar1 Height=13 Width=358/>
        </TabControl>
    <!--</StackPanel>-->


    <!--users and Logs tabs-->
     <StackPanel Name=stkpDetails Grid.RowSpan=4 Height=400 VerticalAlignment=Top Grid.Row=1 Grid.Column=1 Width=400 Visibility=Visible HorizontalAlignment=Center>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width=40*/>
                    <ColumnDefinition Width=60*/>

                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height=10*/>
                    <RowDefinition Height=*/>
                    <RowDefinition Height=*/>
                    <RowDefinition Height=*/>
                    <RowDefinition Height=*/>
                    <RowDefinition Height=*/>
                    <RowDefinition Height=*/>
                    <RowDefinition Height=*/>
                    <RowDefinition Height=*/>
                    <RowDefinition Height=*/>
                    <RowDefinition Height=*/>
                </Grid.RowDefinitions>
                <!---No need to add names as they will not have any interaction-->
                <Label Grid.Row=0 Grid.Column=0 Content=UserId />
                <Label Grid.Row=1 Grid.Column=0 Content=QuoteId />
                <Label Grid.Row=2 Grid.Column=0 Content=oAmount />
                <Label Grid.Row=3 Grid.Column=0 Content=oTerm />
                <Label Grid.Row=4 Grid.Column=0 Content=oIntRate />
                <Label Grid.Row=5 Grid.Column=0 Content=p Name />
                <Label Grid.Row=8 Grid.Column=0 Content=o Status />

                <TextBox Grid.Row=0 Grid.Column=1 Name=tbxUserId />
                <TextBox Grid.Row=1 Grid.Column=1 Name=tbxQuoteId />
                <TextBox Grid.Row=2 Grid.Column=1 Name=tbxoAmount />
                <TextBox Grid.Row=3 Grid.Column=1 Name=tbxoTerm />
                <TextBox Grid.Row=4 Grid.Column=1 Name=tbxoIntRate />
                <TextBox Grid.Row=5 Grid.Column=1 Name=tbxpName />

                <ComboBox Name=cbooStatus Grid.Column=1 Grid.Row=8>
                        <ComboBoxItem Content=Please select/>
                        <ComboBoxItem Content=Approved/>
                        <ComboBoxItem Content=Rejected />
                        <ComboBoxItem Content=Pending />
                        <ComboBoxItem Content=Revised o />
                </ComboBox>

                    <Button Name=btnUpdate Grid.Row=9 Grid.Column=2 Content=Update Width=60 Height=30 HorizontalAlignment=Center Click=btnUpdate_Click></Button>
            </Grid>
        </StackPanel>
</Grid>

Veröffentlicht am 18/12/2018 um 11:09
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