很好的答案

Question

我有一个简单的数据结构类：

public class Client {
    public String name {set; get;}
    public String claim_number {set; get;}
}

我正在加入DataGrid：

this.data_grid_clients.ItemSource = this.clients;

我想更改列标题。即：声明号码为“索赔号”。我知道这可以通过执行以下操作手动创建列来完成：

this.data_grid_clients.Columns[0].Header = "Claim Number"

但是，自动生成列时Columns属性为空。有没有办法重命名列，还是我必须手动生成列？

Answer 1

您可以使用DisplayNameAttribute并更新代码的某些部分，以达到您想要的效果。

您要做的第一件事是，在Client类的属性中添加[DisplayName("")]。

public class Client {
    [DisplayName("Column Name 1")]
    public String name {set; get;}

    [DisplayName("Clain Number")]
    public String claim_number {set; get;}
}

更新xaml代码，为AutoGenerationColumn事件添加事件处理程序。

<dg:DataGrid AutoGenerateColumns="True" AutoGeneratingColumn="OnAutoGeneratingColumn">
</dg:DataGrid>

最后，在代码隐藏中添加一个方法。

private void OnAutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    var displayName = GetPropertyDisplayName(e.PropertyDescriptor);

    if (!string.IsNullOrEmpty(displayName))
    {
        e.Column.Header = displayName;
    }

}

public static string GetPropertyDisplayName(object descriptor)
{
    var pd = descriptor as PropertyDescriptor;

    if (pd != null)
    {
        // Check for DisplayName attribute and set the column header accordingly
        var displayName = pd.Attributes[typeof(DisplayNameAttribute)] as DisplayNameAttribute;

        if (displayName != null && displayName != DisplayNameAttribute.Default)
        {
            return displayName.DisplayName;
        }

    }
    else
    {
        var pi = descriptor as PropertyInfo;

        if (pi != null)
        {
            // Check for DisplayName attribute and set the column header accordingly
            Object[] attributes = pi.GetCustomAttributes(typeof(DisplayNameAttribute), true);
            for (int i = 0; i < attributes.Length; ++i)
            {
                var displayName = attributes[i] as DisplayNameAttribute;
                if (displayName != null && displayName != DisplayNameAttribute.Default)
                {
                    return displayName.DisplayName;
                }
            }
        }
    }

    return null;
}

Answer 2

很好的答案

您可以在Header事件中修改自动生成的DataGridColumn标题的AutoGeneratingColumn，您可以在其中访问DisplayNameAttribute

<强> Client.cs

public class Client
{
    [DisplayName("Name")]
    public String name { set; get; }

    [DisplayName("Claim Number")]
    public String claim_number { set; get; }
}

<强>的.xaml

<DataGrid ItemSource="{Binding Clients}"
          AutoGenerateColumns="True"
          AutoGeneratingColumn="DataGrid_AutoGeneratingColumn" />

<强> .xaml.cs

V1

// This snippet can be used if you can be sure that every
// member will be decorated with a [DisplayNameAttribute]
private void DataGrid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
    => e.Column.Header = ((PropertyDescriptor)e.PropertyDescriptor).DisplayName;

V2

// This snippet is much safer in terms of preventing unwanted
// Exceptions because of missing [DisplayNameAttribute].
private void DataGrid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    if (e.PropertyDescriptor is PropertyDescriptor descriptor)
    {
        e.Column.Header = descriptor.DisplayName ?? descriptor.Name;
    }
}

Answer 3

您可以使用AutoGeneratingColumns事件。

private void dataGridAutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
  if (e.PropertyName.StartsWith("MyColumn")
    e.Column.Header = "Anything I Want";
}

Answer 4

MVVM答案

为了使其与MVVM模式保持一致并避免使用背后的可怕代码，您可以使用Sytem.Windows.Interactivity（位于nuget上的Expression Blend SDK的一部分）中的自定义行为。在创建行为的项目中，您还需要Windows.Base.dll。

XAML

<DataGrid AutoGenerateColumns="True">
    <i:Interaction.Behaviors>
        <behaviours:ColumnHeaderBehaviour/>
    </i:Interaction.Behaviors>
</DataGrid>

行为类别

public class ColumnHeaderBehaviour : Behavior<DataGrid>
{
    protected override void OnAttached()
    {
        AssociatedObject.AutoGeneratingColumn += OnGeneratingColumn;
    }

    protected override void OnDetaching()
    {
        AssociatedObject.AutoGeneratingColumn -= OnGeneratingColumn;
    }

    private static void OnGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs eventArgs)
    {
        if (eventArgs.PropertyDescriptor is PropertyDescriptor descriptor)
        {
            eventArgs.Column.Header = descriptor.DisplayName ?? descriptor.Name;
        }
        else
        {
            eventArgs.Cancel = true;
        }
    }
}

行为确实很有用，不必在与视图相同的项目中进行定义，这意味着您可以创建行为库并在许多应用程序中使用它们。

Answer 5

我将Ekk的答案重构为更短且与Resharper兼容的解决方案：

  CREATE PROCEDURE mark
    @variable VARCHAR(max)
  AS
  BEGIN
    DECLARE @sql NVARCHAR(Max)
    SET @sql='update tab_A set Analyzed=1 where id IN ('''+Convert(NVARCHAR(max),@variable)+''') '
    EXEC (@sql)
  END

Answer 6

简答

您可以修改Header事件中自动生成的DataGridColumn标头的AutoGeneratingColumn。

<强>的.xaml

<DataGrid ItemSource="{Binding Clients}"
          AutoGenerateColumns="True"
          AutoGeneratingColumn="DataGrid_AutoGeneratingColumn" />

<强> .xaml.cs

private void DataGrid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    switch (e.Name)
    {
        case nameof(Client.name):
            e.Column.Header = "Name";
            break;

        case nameof(Client.claim_number):
            e.Column.Header = "Claim Number";
            break;
    }
}

Answer 7

另一种生成列标题的方法

在附加到OnAutoGeneratingColumn方法的上下文中添加其他人所说的内容；我发现以下方法很有用。

它将确保它与其他视图模型一样使用视图模型属性中的DisplayName属性，但是如果未设置该名称，它将使用正则表达式采用Pascal大小写的名称并将其转换为漂亮的列标题。 / p>

 //Note that I cleaned this up after I pasted it into the Stackoverflow Window, I don't
 //think I caused any compilation errors but you have been warned.
 private void InvoiceDetails_OnAutoGeneratingColumn(object sender,
                                                    DataGridAutoGeneratingColumnEventArgs e)
 {
     if (!(e.PropertyDescriptor is PropertyDescriptor descriptor)) return;

     //You cannot just use descriptor.DisplayName because it provides you a value regardless to it 
     // being manually set.  This approach only uses a DisplayName that was manually set on a view
     // model property.  
     if (descriptor.Attributes[typeof(DisplayNameAttribute)] 
                    is DisplayNameAttribute displayNameAttr
                    && !string.IsNullOrEmpty(displayNameAttr.DisplayName))
     {
         e.Column.Header = displayNameAttr.DisplayName;
         return;
     }

     //If you only wanted to display columns that had DisplayName set you could collapse the ones
     // that didn't with this line.
     //e.Column.Visibility = Visibility.Collapsed;
     //return;

     //This alternative approach uses regular expressions and does not require 
     //DisplayName be manually set.  It will Breakup Pascal named variables 
     //"NamedLikeThis" into nice column headers that are "Named Like This".
     e.Column.Header = Regex.Replace(descriptor.Name,
             @"((?<=[A-Z])([A-Z])(?=[a-z]))|((?<=[a-z]+)([A-Z]))",
             @" $0",
             RegexOptions.Compiled)
            .Trim();

 }

当AutoGenerateColumns = True时，如何重命名DataGrid列？

7 个答案:

很好的答案

MVVM答案

简答

另一种生成列标题的方法