wpf datagrid没有数据时怎样显示“暂无数据”四个大字

Question

wpf datagrid没有数据时怎样显示“暂无数据”四个大字

有绑定数据源，但是数据源的记录是0.

Answer 1

使用转换器

用转换器做不到吧。

Answer 2

就是类似上图的效果。上图是PHOTOSHOP的效果图。

Answer 3

判断数据源是否为空，如果空，插入暂无数据

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please verify my account

Answer 4

判断数据源是否为空，如果空，插入暂无数据

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please verify my account

你是说，没有数据时，隐藏DATAGRID，然后显示一个TEXTBLOCK控件？

Answer 5

方法有很多种，转换器可以实现

class NoDataStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return ((int)value) == 0 ? "暂无数据":"";
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

<ListView.Background>
                            <VisualBrush>
                                <VisualBrush.Visual>
                                    <TextBlock Text="{Binding Items.Count,Converter={StaticResource NoDataStringConverter}, ElementName=listView}" Opacity=".5"/>
                                </VisualBrush.Visual>
                                <VisualBrush.RelativeTransform>
                                    <TransformGroup>
                                        <ScaleTransform ScaleX=".1" ScaleY=".1" CenterX=".5" CenterY=".5"/>
                                    </TransformGroup>
                                </VisualBrush.RelativeTransform>
                            </VisualBrush>
                        </ListView.Background>

Answer 6

<Window x:Class="ListView无数据时显示文字.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:ListView无数据时显示文字"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:NoDataStringConverter x:Key="NoDataStringConverter"/>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Button Content="加载、清空" Margin="5" Click="Button_Click"/>
        <ListView Name="lv1" Grid.Row="1">
            <ListView.Background>
                <VisualBrush>
                    <VisualBrush.Visual>
                        <TextBlock Text="{Binding Items.Count,Converter={StaticResource NoDataStringConverter}, ElementName=lv1}" Opacity=".5"/>
                    </VisualBrush.Visual>
                    <VisualBrush.RelativeTransform>
                        <TransformGroup>
                            <ScaleTransform ScaleX=".1" ScaleY=".1" CenterX=".5" CenterY=".5"/>
                        </TransformGroup>
                    </VisualBrush.RelativeTransform>
                </VisualBrush>
            </ListView.Background>
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="id" DisplayMemberBinding="{Binding id}"/>
                    <GridViewColumn Header="value" DisplayMemberBinding="{Binding value}"/>
                    <GridViewColumn Header="value2" DisplayMemberBinding="{Binding value2}"/>
                </GridView>
            </ListView.View>
        </ListView>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace ListView无数据时显示文字
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        DataTable dt = new DataTable();
       
        public MainWindow()
        {
            InitializeComponent();
            dt.Columns.Add("id");
            dt.Columns.Add("value");
            dt.Columns.Add("value2");
            Random rd = new Random();
            for (int i = 0; i < 5; i++)
            {
                DataRow dr = dt.NewRow();
                dr[0] = i;
                dr[1] = rd.Next();
                dr[2] = rd.Next();
                dt.Rows.Add(dr);
            }
            lv1.ItemsSource = dt.DefaultView;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (lv1.ItemsSource!=null)
            {
                lv1.ItemsSource = null;
            }
            else
            {
                lv1.ItemsSource = dt.DefaultView;
            }
        }
    }

}

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;

namespace ListView无数据时显示文字
{
    class NoDataStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return ((int)value) == 0 ? "暂无数据" : "";
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

Answer 7

Hi 彭123，

>>wpf datagrid没有数据时怎样显示“暂无数据”四个大字

你也可以参考下面一种实现方式，使用Triggers 来改变背景显示。下面有代码示例。

<Window.Resources>
        <Style x:Key="{x:Type ItemsControl}" TargetType="{x:Type ItemsControl}">
            <Setter Property="Background" Value="Transparent"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Items.Count, RelativeSource={RelativeSource Self}}" Value="0">
                    <Setter Property="Background">
                        <Setter.Value>
                            <VisualBrush Stretch="None">
                                <VisualBrush.Visual>
                                    <TextBlock Text="No record found | 暂无数据 " 
                                       />
                                </VisualBrush.Visual>
                            </VisualBrush>
                        </Setter.Value>
                    </Setter>
                </DataTrigger>
                <DataTrigger Binding="{Binding Items, RelativeSource={RelativeSource Self}}" Value="{x:Null}">
                    <Setter Property="Background">
                        <Setter.Value>
                            <VisualBrush Stretch="None">
                                <VisualBrush.Visual>
                                    <TextBlock Text="No record found | 暂无数据 " 
                                       />
                                </VisualBrush.Visual>
                            </VisualBrush>
                        </Setter.Value>
                    </Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
        <Style x:Key="{x:Type DataGrid}" TargetType="{x:Type DataGrid}" BasedOn="{StaticResource {x:Type ItemsControl}}">
        </Style>
    </Window.Resources>

      <DataGrid x:Name="dgvRate" Grid.Row="1" AutoGenerateColumns="True">
            <DataGrid.Columns>
            </DataGrid.Columns>
        </DataGrid>

Best Regards,

Yohann Lu

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