数据填充 Datagrid，但未出现在 WPF 中

Question

我正在创建一个字符串 List<>，然后调用它来根据文本文档之间的差异填充数据网格。数据似乎正在填充数据网格，但实际上并没有显示出来。我知道这听起来令人困惑，但我玩过 background/foreground 颜色，看起来它们似乎根本不影响它。我能够让它与文本块一起使用，但后来我无法滚动。

编辑：我编辑了这个以试图提高我的声誉。短时间内跌了不少。我不确定这是我的代码格式还是问题的性质，但如果有人有建议我愿意听。

        string sSelectedFile;
        string sSelectedFolder;

        public static List<String> txt1 = new List<string>();
        public static List<String> txt2 = new List<string>();
        public static List<String> Diff = new List<string>();

        public static List<int> DifferenceCounter = new List<int>();

        public static List<int> IntDifferenceOccurance = new List<int>();


        //public static List<string> Diff;
        public ObservableCollection<CustomerInformation> CustomerInformationList { get; } = new ObservableCollection<CustomerInformation>();

        public MainWindow()
        {
            InitializeComponent();
        }



        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            Environment.Exit(0);
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            FolderBrowserDialog fbd = new FolderBrowserDialog();
            //fbd.Description = "Custom Description"; //not mandatory

            if (fbd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                sSelectedFolder = fbd.SelectedPath;
            else
                sSelectedFolder = string.Empty;

            Textbox2.Text = sSelectedFolder;
        }

        private void Button_Click_2(object sender, RoutedEventArgs e)
        {
            OpenFileDialog choofdlog = new OpenFileDialog();
            choofdlog.Filter = "txt files (*.txt)|*.txt";
            choofdlog.FilterIndex = 1;
            choofdlog.Multiselect = true;

            if (choofdlog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                sSelectedFile = choofdlog.FileName;
            else
                sSelectedFile = string.Empty;


            Textbox2.Text = sSelectedFile;
        }



        private void Button_Click_3(object sender, RoutedEventArgs e)
        {
            OpenFileDialog choofdlog = new OpenFileDialog();
            choofdlog.Filter = "txt files (*.txt)|*.txt";
            choofdlog.FilterIndex = 1;
            choofdlog.Multiselect = true;

            if (choofdlog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                sSelectedFile = choofdlog.FileName;
            else
                sSelectedFile = string.Empty;


            Textbox3.Text = sSelectedFile;
        }




        private void Button_Click(object sender, RoutedEventArgs e)
        {


            FillListTxt1();

            FillListTxt2();


            compareStringList();

        }


        public void FillListTxt1()
        {

            txt1.Clear();


            try
            {

                var fileStream = new FileStream(Textbox2.Text, FileMode.Open, FileAccess.Read);
                using (var streamReader = new StreamReader(fileStream, Encoding.UTF8))
                {
                    string line;
                    while ((line = streamReader.ReadLine()) != null)
                    {

                        txt1.Add(line);



                    }
                }

            }
            catch  (Exception ex)
            {

                throw ex;

            }




        }


        public void FillListTxt2()
        {


            txt2.Clear();

            try
            {

                var fileStream = new FileStream(Textbox3.Text, FileMode.Open, FileAccess.Read);
                using (var streamReader = new StreamReader(fileStream, Encoding.UTF8))
                {
                    string line;
                    while ((line = streamReader.ReadLine()) != null)
                    {



                        txt2.Add(line);





                    }
                }

            }
            catch (Exception ex)
            {

                throw ex;

            }



        }
    public class CustomerInformation
    {

        public string GetDiff { get; set; }     

    }


         public void compareStringList()
        {



            Diff.Clear();


            string Text1;
            string Text2;
            string StillCounting = "Yes";

            int IndexTxt1 = 0;
            int IndexTxt2 = 0;

            int Counter = 0;


            Int32 length = txt1.Count;
            Int32 length1 = txt2.Count;

            while (StillCounting == "Yes")
            {

                if (length > IndexTxt1 & length1 > IndexTxt2)
                {

                    Text1 = txt1[IndexTxt1];
                    Text2 = txt2[IndexTxt2];

                    if (Text1 != Text2)
                    {

                        //System.Windows.Forms.MessageBox.Show("There is a difference on line " +  IndexTxt1.ToString());


                        string DifferencesInList = "There is a difference on line " + IndexTxt1.ToString();

                        Diff.Add(DifferencesInList);




                        IndexTxt1 = IndexTxt1 + 1;
                        IndexTxt2 = IndexTxt2 + 1;

                        Counter = Counter + 1;
                    }
                    else
                    {

                        IndexTxt1 = IndexTxt1 + 1;
                        IndexTxt2 = IndexTxt2 + 1;

                    }



                }
                else
                {



                    StillCounting = "No";

                }






            }


            if (Counter == 0)
            {

                System.Windows.Forms.MessageBox.Show("These are exactly the same");

            }


            FillDataGrid();


        }


    public void FillDataGrid()
    {




         Int32 length1 = Diff.Count;
         int countLength = 0;

         string Text2; 

         //Text2 = Diff[countLength];

         while (length1 > countLength)
         {


              CustomerInformation TempCust = new CustomerInformation();

              TempCust.GetDiff =  Diff[countLength];

              Differences.Items.Add(TempCust.GetDiff);

              Differences.MinRowHeight = 30;

              countLength = countLength + 1;

         }


         //Differences.DataContext = Diff;

    }

这是数据网格的 XAML 代码：

        <DataGrid ItemsSource="{Binding CustomerInformationList,  RelativeSource={RelativeSource AncestorType=Window}}" Grid.RowSpan="4" HorizontalAlignment="Center" HorizontalContentAlignment="Center" AutoGenerateColumns="True" HorizontalScrollBarVisibility="Visible" Width="400" x:Name="Differences" Grid.Row="5" Grid.ColumnSpan="3" FontSize="16" Height="600" Grid.Column="1" VerticalAlignment="Top">
            <DataGrid.Resources>

                <Style TargetType="{x:Type DataGrid}">

                    <Setter Property="HorizontalContentAlignment" Value="Center"/>

                </Style>

                <Style TargetType="{x:Type DataGridColumnHeader}">

                    <Setter Property="Background" Value="LightYellow"/>
                    <Setter Property="FontWeight" Value="Bold"/>
                    <Setter Property="BorderThickness" Value="0,0,1,2"/>
                    <Setter Property="BorderBrush" Value="Black"/>
                    <Setter Property="HorizontalContentAlignment" Value="Center"/>
                    <Setter Property="Width" Value="400"/>

                </Style>

            </DataGrid.Resources>
            <DataGrid.Columns>
                <!-- Each row is one item from CustomerInformationList. That means each row is an instance of
        CustomerInformation. CustomerInformation has a property named GetDiff, and here is how we bind to that property. -->


            </DataGrid.Columns>
        </DataGrid>

输出填充数据网格，但未显示。对于格式错误，我深表歉意。我很难纠正它们。这不应该是代码。

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Answer 1

首先，让我们创建一个可观察的集合，我们将使用它来填充 DataGrid。由于您的网格列绑定到一个名为 GetDiff 的属性，并且 CustomerInformation 有一个同名的属性，我猜您想用class。

MainWindow.xaml.cs

//  I don't know how you're populating this list. I'm guessing that happens in 
//  compareStringList() and then you call FillDataGrid(). 
private List<string> Diff;
public ObservableCollection<CustomerInformation> CustomerInformationList { get; } 
    = new ObservableCollection<CustomerInformation>();

public void FillDataGrid()
{
    CustomerInformationList.Clear();

    foreach (var diff in Diff)
    {
        CustomerInformation TempCust = new CustomerInformation();

        TempCust.GetDiff = diff;

        CustomerInformationList.Add(TempCust);
    }
}

现在，让我们使用绑定告诉您的 DataGrid 使用我们创建的集合属性。因为您在 DataGrid 上设置了 AutoGenerateColumns="True"，所以您不需要自己创建列，但是您有绑定，所以我设置 AutoGenerateColumns="False" 并包括列定义。

<DataGrid 
    ItemsSource="{Binding CustomerInformationList, RelativeSource={RelativeSource AncestorType=Window}}"
    AutoGenerateColumns="True" 
    HorizontalScrollBarVisibility="Visible" 
    Width="400" 
    x:Name="Differences" 
    Grid.Row="4" 
    Grid.ColumnSpan="3" 
    FontSize="16" Grid.Column="1"
    >
    <DataGrid.Resources>
        <!-- Stuff omitted -->
    </DataGrid.Resources>
    <DataGrid.Columns>
        <!-- 
        Each row is one item from CustomerInformationList. That means each row is an instance of
        CustomerInformation. CustomerInformation has a property named GetDiff, and here is how we 
        bind to that property. 
        -->
        <DataGridTextColumn 
            Header="Difference On Lines" 
            Binding="{Binding GetDiff}" 
            FontSize="16" 
            Width="200"
            />
    </DataGrid.Columns>
</DataGrid>

Answer 2

您正在将 string 添加到您的 DataGrid 但绑定到 GetDiff。

方法“填充数据网格”

CustomerInformation TempCust = new CustomerInformation();
TempCust.GetDiff =  Diff[countLength];
Differences.Items.Add(TempCust.GetDiff); // <-- here you are adding string
// change it to "Differences.Items.Add(TempCust);" and it should work

XAML

<!-- here you are binding to "GetDiff" -->
<DataGridTextColumn Header="Difference On Lines" Binding="{Binding GetDiff}" FontSize="16" Width="200"/>

数据填充 Datagrid，但未出现在 WPF 中

Data fills Datagrid, but doesn't appear in WPF

c#

wpf

visual-studio-2019