为什么 DataAnnotations使用带有 AutoGenerateColumns=“True” 的 DataGrid 时被忽略

发布于 2024-10-20 23:00:17 字数 399 浏览 4 评论 0原文

我正在使用 WPF DataGrid 绑定到自定义类的集合。在网格 XAML 中使用 AutoGenerateColumns="True"，可以很好地创建和填充网格，但正如人们所期望的那样，标题是属性名称。

我尝试

<Display(Name:="My Name")>

从 System.ComponentModel.DataAnnotations 命名空间指定，但这没有效果。我还尝试

<DisplayName("My Name")>

从 System.ComponentModel 命名空间，但标题仍然不受影响。

是否无法使用 AutoGenerateColumns 选项指定列标题？

原文

I'm using the WPF DataGrid to bind to a collection of a custom class. Using AutoGenerateColumns="True" in the grid XAML, the grid is created and populated just fine, but the headings are the property names, as one would expect.

I tried specifying

<Display(Name:="My Name")>

from the System.ComponentModel.DataAnnotations namespace and that has no effect. I also tried

<DisplayName("My Name")>

from the System.ComponentModel name space but still the headings are not affected.

Is there no way to specify column headings with the AutoGenerateColumns option?

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不甘平庸 2024-10-27 23:00:17

使用@Marc的建议是解决方案的开始，但就其本身而言，自动生成的列仍然将属性名称作为标题。

要获取 DisplayName，您需要添加一个例程（在后面的代码中）来处理 GridAutoGenerateColumn 事件：

Private Sub OnGeneratingColumn(sender As Object, e As System.Windows.Controls.DataGridAutoGeneratingColumnEventArgs) Handles Grid.AutoGeneratingColumn
    Dim pd As System.ComponentModel.PropertyDescriptor = e.PropertyDescriptor
    e.Column.Header = pd.DisplayName
End Sub

另一个更好的解决方案是使用 ComponentModel.DataAnnotations 命名空间并指定 ShortName：

Public Class modelQ016
    <Display(shortname:="DB Name")>
    Public Property DBNAME As String
    ...

OnGenerateColumn 变为：

        Dim pd As System.ComponentModel.PropertyDescriptor = e.PropertyDescriptor
        Dim DisplayAttrib As System.ComponentModel.DataAnnotations.DisplayAttribute =
            pd.Attributes(GetType(ComponentModel.DataAnnotations.DisplayAttribute))
        If Not DisplayAttrib Is Nothing Then
            e.Column.Header = DisplayAttrib.ShortName
        End If

请注意，属性中的顺序属性数组发生变化，因此您必须使用 GetType(...) 而不是数字参数...真有趣！

Using @Marc's suggestion was the beginning of the solution, but taken on it's own, the AutoGenerated columns still have the property names as headings.

To get the DisplayName, you need to add a routine (in the code behind) to handle the GridAutoGeneratingColumn event:

Private Sub OnGeneratingColumn(sender As Object, e As System.Windows.Controls.DataGridAutoGeneratingColumnEventArgs) Handles Grid.AutoGeneratingColumn
    Dim pd As System.ComponentModel.PropertyDescriptor = e.PropertyDescriptor
    e.Column.Header = pd.DisplayName
End Sub

An additional and better solution is to use the ComponentModel.DataAnnotations namespace and specify ShortName:

Public Class modelQ016
    <Display(shortname:="DB Name")>
    Public Property DBNAME As String
    ...

OnGeneratingColumn becomes:

        Dim pd As System.ComponentModel.PropertyDescriptor = e.PropertyDescriptor
        Dim DisplayAttrib As System.ComponentModel.DataAnnotations.DisplayAttribute =
            pd.Attributes(GetType(ComponentModel.DataAnnotations.DisplayAttribute))
        If Not DisplayAttrib Is Nothing Then
            e.Column.Header = DisplayAttrib.ShortName
        End If

Note that the order of attributes in the attribute array changes, so you must use the GetType(...) instead of a numeric parameter... Such fun!

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红ご颜醉 2024-10-27 23:00:17

您可以尝试旧的 System.ComponentModel.DisplayNameAttribute。用 C# 语言来说，[DisplayName("My Name")]。特别是，这适用于 PropertyDescriptor，它支持大量数据绑定。

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无人问我粥可暖 2024-10-27 23:00:17

通过使用 @GilShalit 帖子，如果您此时在 C# 中使用资源（您可能应该支持多文化语言支持），则需要添加以下内容

带有注释的属性声明

[Display(ResourceType = typeof (YourStronglyTypedMessagesResource), Name = "YourGridColumnName")]
public string Column1 { get; set; }

<事件处理程序

private void DataGrid_OnAutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    var pd = (PropertyDescriptor)e.PropertyDescriptor;
    var atb = (DisplayAttribute)pd.Attributes[typeof(DisplayAttribute)];
    if (atb != null)
    {
        e.Column.Header = atb.GetName();
    }
}

By using @GilShalit post upon, this is what is needed to add in case that you are using Resources (as you probably should for multi culture language support) in C# in this time

Your property Declaration with Annotation

[Display(ResourceType = typeof (YourStronglyTypedMessagesResource), Name = "YourGridColumnName")]
public string Column1 { get; set; }

Event handler

private void DataGrid_OnAutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    var pd = (PropertyDescriptor)e.PropertyDescriptor;
    var atb = (DisplayAttribute)pd.Attributes[typeof(DisplayAttribute)];
    if (atb != null)
    {
        e.Column.Header = atb.GetName();
    }
}

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