Datagrid：背景颜色+根据单元格值选择禁用 - 使用触发器 [英] Datagrid: background colour + disable of selection depending on the cell value - using trigger

问题描述

在SO上有很多关于WPF datagrids的问题，但是我仍然要问我的原因，我根本无法从那些人那里得到我想要的东西，所以不要和我生气，并且试图帮助我通过回答，请：]。

There is a lot of questions about WPF datagrids on SO, but I still have to ask mine cause I just can't get what I want from those... so don't be mad with me and try to help me by answering pretty please :].

提示：主要问题是：为什么我的触发器不起作用？：|

hint: the main question is: Why my trigger won't work? :|

1. 是否有一个datagrid属性禁用选择单元格的值？我想我知道有这样的东西，但我现在找不到。如果没有这样的事情你会怎么解决这个事情？我正在考虑selectCellsChanged或类似的事件。但是我不知道如何处理它。

1. Is there a datagrid property which disables selecting cell without value? I think I knew there was something like that, but I can't find it now. If there isn't such a thing how would u solve this thing? I was thinking about the event on selectedCellsChanged or something like that. But I'm not sure how to work it out.

如何设置单元格的背景属性？ >正在寻找DatagridCell的一些text / content / value属性（ http://msdn.microsoft.com/en-us/library/system.windows.controls.datagridcell.aspx ）但没有为我工作...
我知道有一些值转换器但是我正在考虑使用触发器来解决这个问题。

How can I set background property of cell depending on the value inside? Was looking for some text/content/value property for DatagridCell(http://msdn.microsoft.com/en-us/library/system.windows.controls.datagridcell.aspx) but nothing worked for me... I know there is some value convertor but I was thinking of solving this using triggers.

有些信息：我已经设置了 SelectionMode =扩展 + SelectionUnit =Cell。

Some info: I have set SelectionMode="Extended" + SelectionUnit="Cell".

背景使用触发器，但它没有工作：

I have tried setting the background using trigger, but it didnt work:

<DataGrid.CellStyle>
    <Style TargetType="DataGridCell">
        <Style.Triggers>
            <Trigger Property="HasContent"  Value="False">
                <Setter Property="Background" Value="DarkGray"/>
            </Trigger>
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="Background" Value="Red"/>
            </Trigger>
        </Style.Triggers>
    </Style>
</DataGrid.CellStyle>

属性 IsSelected 可以正常工作，但是没有内容的东西没有。是只是我想（错）或 null 是没有内容？
还尝试了< Trigger Property =ContentValue => 和< Trigger Property =ContentValue = null> ，但这些东西只是不想为我工作。我有什么问题？

The property IsSelected works ok, but the thing with no content doesn't. Is it just me thinking (wrong) that "" or null is no content? Also tried <Trigger Property="Content" Value=""> and <Trigger Property="Content" Value="null">, but these things just don't want to work for me. What's wrong with me???

编辑：我发现这个问题 - 如何使用WPF Toolkit Datagrid更改单元格的背景颜色a>所以我想我将工作第二个Q，但是我仍然看不到我的触发器有什么问题...
另外如果我的触发器工作，我可以以某种方式设置单元格 HasContent =False如果有这样的话，不可选择。但是我只需要触发工作：D

I found this Q/A - How do I change the background color of a cell using WPF Toolkit Datagrid so I guess I will work the second Q with that, but still I don't see what's wrong with my trigger... Also if my trigger worked I could somehow set the cell with HasContent="False" as not selectable if there is something like that. But I just need to get my trigger work :D

Edit2：当我设置< Trigger Property = HasContentValue =True> 它适用于所有的单元格..所以我猜这是以空/为值。这让我有疑问：

When I set the <Trigger Property="HasContent" Value="True"> it works for all of my cells.. So I guess it takes null/"" as a value. That leaves me to question:

如果我想要特殊的空白背景并禁用他们的选择，应该如何解决？

编辑3：禁用选择应该这样工作：< Setter Property =FocusableValue =false/> / code>感谢 WPF ListView关闭选择 ..哪个不工作：D：'（

Disabling the selection should work like this: <Setter Property="Focusable" Value="false"/> thanks to WPF ListView turn off selection .. which ain't working :D :'(

现在我只需要找出关于 null 单元格...任何提示？

Now I just need to work out the trigger about null content of cell... any hints?

推荐答案

这是我如何设法最终解决我的问题，选择空单元
我知道这不是最好的解决方案，但它适用于我：D
感谢这个问题：如何在DataGrid中确定所选单元格的值？（WPF）它帮助：）。

This is how I managed to finally solve my problem with selecting empty cells. I know it ain't the best solution, but it works for me :D Thanks to this Q/A: How Can Determine Selected Cell's Value In DataGrid? (WPF) it helped :).

private void mydatagrid_SelectedCellsChanged(object sender, SelectedCellsChangedEventArgs e)
        {
            foreach (var item in e.AddedCells)
            {
                var col = item.Column as DataGridColumn;
                var fc = col.GetCellContent(item.Item);

                if (fc is TextBlock)
                {
                    if (((fc as TextBlock).Text == (""))||((fc as TextBlock).Text == null))
                    {
                        mydatagrid.SelectedCells.Remove(item);
                        fc.Focusable = false; // not sure if neccesarry/working after the previous line
                    }
                }
            }
        }

有关背景颜色的部分在此解决：如何在自动生成列事件期间设置datagrid单元格的背景？

The part about background colour is solved here: How to set background of a datagrid cell during autogeneratingcolumn event depending on it's value?

如果你有任何投诉/改进我的解决方案只是添加评论：）。

If u have any complaints/improvements to my solution just add comments :).

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