WPF Datagrid 在行中有数据但不显示文本

Question

也许是晚了，我一直在看我的屏幕太久了，但这真的让我难住了。我有显示数据的数据网格，但在我加入 2 个表并尝试显示数据之后。数据在那里，因为我仍然能够让鼠标双击事件起作用，但没有文本显示在任何列或行中。

这是XAML。

<DataGrid Grid.Column="1" Grid.Row="1" Name="ProjectsSubGrid" ItemsSource="{Binding}" 
          AutoGenerateColumns="False" IsReadOnly="True"  
          MouseDoubleClick="ProjectsSubGrid_MouseDoubleClick" 
          Initialized="ProjectsSubGrid_Initialized">
   <DataGrid.Columns>
      <DataGridTextColumn Binding="{Binding Path=ProjectName}" Header="Project Name"/>
      <DataGridTextColumn Binding="{Binding Path=AllottedHours}" Header="Allotted Hours"/> 
      <DataGridTextColumn Binding="{Binding Path=InvoicedHours}" Header="Invoiced Hours"/>
      <DataGridTextColumn Binding="{Binding Path=UninvoicedHours}" Header="Uninvoiced Hours"/>
      <DataGridTextColumn Binding="{Binding Path=RemainingHours}" Header="Remaining Hours"/>
  </DataGrid.Columns>
</DataGrid>

这是我设置 DataContext 的 C# 代码。

private void ProjectsSubGrid_Initialized(object sender, EventArgs e)
{
    var list = from p in ProjectManagement.Context.Project
               join a in ProjectManagement.Context.Account
               on p.AccountId equals a.AccountId
               select new ProjectView(){
                   AccountId = a.AccountId,
                   ProjectId = p.ProjectId,
                   ProjectName = p.ProjectName,
                   InvoicedHours = p.InvoicedHours,
                   AccountName = a.CompanyName,
                   AllottedHours = p.AllottedHours,
                   RemainingHours = p.RemainingHours,
                   UninvoicedHours = p.UninvoicedHours
               };
     ProjectsSubGrid.DataContext = list;
}

当我使用下面的代码时它可以工作，但是一旦我切换到连接表它就会中断。

ProjectsSubGrid.DataContext = ProjectManagement.Context.Project.Where(p=>true);

如有任何帮助，我们将不胜感激。

Answer 1

1) 你应该只在LoadGrid方法中设置DataGrid的DataContext。

this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() =>
{ 
    ProjectsSubGrid.DataContext = list;
}));

2) 设置DataGridTextColumn的Name属性没有意义。 3) 将您的 linq 查询更新为

var list = (from p in ProjectManagement.Context.Project
               join a in ProjectManagement.Context.Account
               on p.AccountId equals a.AccountId
               select new ProjectView(){
                   AccountId = a.AccountId,
                   ProjectId = p.ProjectId,
                   ProjectName = p.ProjectName,
                   InvoicedHours = p.InvoicedHours,
                   AccountName = a.CompanyName,
                   AllottedHours = p.AllottedHours,
                   RemainingHours = p.RemainingHours,
                   UninvoicedHours = p.UninvoicedHours
               }).ToList();

Answer 2

尝试将路径添加到您的绑定 DataGridTextColumn 语句。这是我之前项目的一个例子。

    <DataGrid Grid.Column="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                                            ItemsSource="{Binding Addresses}"
                                            AutoGenerateColumns="False"
                                            CanUserAddRows="False"
                                            IsReadOnly="True"
                                            SelectionMode="Single"
                                            IsEnabled="{Binding IsSelectionEnabled}"
                                            SelectedItem="{Binding SelectedAddress}"
                                            SelectedIndex="{Binding SelectedIndex}"
                                            >
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Path=Street}" Header="Street"/>
            <DataGridTextColumn Binding="{Binding Path=Number}" Header="Number"/>
            <DataGridTextColumn Binding="{Binding Path=PostalCode}" Header="PostalCode"/>
            <DataGridTextColumn Binding="{Binding Path=City}" Header="City"/>
            <DataGridTextColumn Binding="{Binding Path=Provence}" Header="Provence"/>
            <DataGridTextColumn Binding="{Binding Path=Country}" Header="Country"/>
        </DataGrid.Columns>
    </DataGrid>

Answer 3

在此感谢大家的帮助。估计是我昨晚看屏幕时间太长了。我没有发布 ProjectView class 的代码，这就是问题所在。

我写了

public class ProjectView
{
    public int ProjectId;   
    public string ProjectName;
    public int AccountId;
    public string AccountName;
    public int AllottedHours;
    public int InvoicedHours;
    public int UninvoicedHours;
    public int RemainingHours;
}

我通过将其更改为

来修复它

public class ProjectView
{
    public int ProjectId { get; set; }    
    public string ProjectName { get; set; }
    public int AccountId { get; set; }
    public string AccountName { get; set; }
    public int AllottedHours{ get; set; }
    public int InvoicedHours { get; set; }
    public int UninvoicedHours { get; set; }
    public int RemainingHours { get; set; }
}

WPF Datagrid 在行中有数据但不显示文本

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