Question

我试图从datagrid（wpf）中的web服务列出数据，但我不知道我做错了什么，或者给我错误或者没有列出任何内容。这就是我现在的样子。

WINDOWS.XAML

<Window x:Class="IssueAddinOutlook.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:dg="http://schemas.microsoft.com/wpf/2008/toolkit"
    Title="Issue List" Height="424" Width="696">

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="102*" />
        <ColumnDefinition Width="590*" />
    </Grid.ColumnDefinitions>
    <Label Height="41" Margin="172,0,265,0" Name="label1" VerticalAlignment="Top" FontSize="22" Grid.Column="1">Issue List</Label>

    <dg:DataGrid x:Name="dataGrid" AutoGenerateColumns="True"
         AlternationCount="2"

         HeadersVisibility="All"
         HorizontalGridLinesBrush="#DDDDDD"
         VerticalGridLinesBrush="#DDDDDD" Grid.ColumnSpan="2" Margin="0,0,28,26">

        <dg:DataGrid.Columns>
            <dg:DataGridTextColumn Header="ID Issue" Binding="{Binding Path=Id}" />
            <dg:DataGridTextColumn Header="Order Id" Binding="{Binding Path=OrderId}" />
            <dg:DataGridTextColumn Header="Is Done" Binding="{Binding Path=IsDone}" />
            <dg:DataGridTextColumn Header="Final Comment" Binding="{Binding Path=FinalComment}" />
            <dg:DataGridTextColumn Header="Actual Hours" Binding="{Binding Path=ActualHours}" />
            <dg:DataGridTextColumn Header="Group Id" Binding="{Binding Path=GroupId}" />
        </dg:DataGrid.Columns>
    </dg:DataGrid>
</Grid>
<Window.Resources>
    <Style x:Key="columnHeaderStyle" TargetType="{x:Type dg:DataGridColumnHeader}">
        <Setter Property="Background">
            <Setter.Value>
                <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
                    <LinearGradientBrush.GradientStops>
                        <GradientStop Color="Navy" Offset="0" />
                        <GradientStop Color="LightBlue" Offset="1" />
                    </LinearGradientBrush.GradientStops>
                </LinearGradientBrush>
            </Setter.Value>
        </Setter>
        <Setter Property="Foreground" Value="White" />
    </Style>
    <Style x:Key="rowStyle" TargetType="dg:DataGridRow">
        <Setter Property="FontFamily" Value="Verdana" />
        <Setter Property="FontSize" Value="10" />
        <Style.Triggers>
            <Trigger Property="AlternationIndex" Value="0">
                <Setter Property="Background" Value="White" />
            </Trigger>
            <Trigger Property="AlternationIndex" Value="1">
                <Setter Property="Background" Value="#DDDDDD" />
            </Trigger>
            <Trigger Property="IsMouseOver" Value="True">
                <Setter Property="Background" Value="#BBBBBB" />
            </Trigger>
        </Style.Triggers>
    </Style>
</Window.Resources>

和WINDOWS.XAML.CS

 Issuereference.Tasks issueRef = new Issuereference.Tasks();
 Issuereference.TASK[] tasksList = issueRef.GetTasks(39);
 dataGrid.ItemsSource = tasksList.ToList();

使用此代码提供错误在使用ItemsSource之前，Items集合必须为空。 任何人都可以帮助我吗？

Answer 1

您的代码似乎运行正常。无论如何，分配ItemsSource，网格中是否有任何内容？或者是否有应用程序的任何部分手动将项目添加到DataGrid？该错误消息通常意味着应用程序的一部分已更新ItemsControl的集合，同时它具有已分配的ItemsSource。希望这是有道理的。

列出来自datagrid WPF中的Web服务的数据

1 个答案: