WPF：如何获取 Binding.Converter

发布于 2024-08-26 23:08:15 字数 621 浏览 5 评论 0原文

我使用 Binding 创建 DataGrid 列（其中 i 是 Int 值）：

dataGrid.Columns.Add(new DataGridTextColumn
{
   Header = i.ToString(),
   Binding = CreateBinding(i),
});

private Binding CreateBinding(int num)
{
   Binding bind = new Binding(string.Format("[{0}]", num));         
   bind.Converter = new CellValueConverter();
   return bind;
}

在 CreateBinding 方法中，我可以访问 bind.Converter 属性。
我需要在某些处理程序中调用 Converter.Convert() 方法，但当我尝试访问它时没有 Converter 属性：

(dataGrid.Columns[clm] as DataGridTextColumn).Binding."no Converter property!"

如何获取为特定列创建的 CellValueConverter？

原文

I create DataGrid Columns with Binding (where i is a Int value):

dataGrid.Columns.Add(new DataGridTextColumn
{
   Header = i.ToString(),
   Binding = CreateBinding(i),
});

private Binding CreateBinding(int num)
{
   Binding bind = new Binding(string.Format("[{0}]", num));         
   bind.Converter = new CellValueConverter();
   return bind;
}

In the CreateBinding method I have an access to bind.Converter property.
I need to call Converter.Convert() method in some handler, but there is no Converter property when I try to access it:

(dataGrid.Columns[clm] as DataGridTextColumn).Binding."no Converter property!"

How can I get my CellValueConverter which was created for particular Column?

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ペ泪落弦音 2024-09-02 23:08:15

这是因为绑定DataGridBoundColumn（和 DataGridTextColumn）上的属性实际上返回一个 BindingBase 实例，而不是 Binding。 BindingBase 不支持转换器。

您应该能够尝试投射：

var binding = (dataGrid.Columns[clm] as DataGridBoundColumn).Binding as Binding;
if(binding != null)
{
    IValueConverter converter = binding.Converter; // Will work here
 }

This is because the Binding property on DataGridBoundColumn (and DataGridTextColumn) actually returns a BindingBase instance, not a Binding. BindingBase doesn't support converters.

You should be able to try to cast:

var binding = (dataGrid.Columns[clm] as DataGridBoundColumn).Binding as Binding;
if(binding != null)
{
    IValueConverter converter = binding.Converter; // Will work here
 }

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