如何将 DataGridViewComboBoxColumn 绑定到对象? [英] How to bound a DataGridViewComboBoxColumn to a object?

问题描述

我正在尝试将 DataGridViewComboBoxColumn 绑定到 Foo 的实例，但是当我在网格上设置一个值时，我收到一个 ArgumentException 告诉我我不能从字符串转换为 Foo.

I'm trying to bound a DataGridViewComboBoxColumn to an instance of Foo, but when i set a value on the grid i got a ArgumentException telling me that i can not convert from String to Foo.

var data = (from item in someTable
            select new { Foo = item.foo, Bar = item.Bar }).ToList();
grid.DataSource = data;
column.DataPropertyName = "Foo";
column.DataSource = (from foo in Foo select foo).ToList (); //foo is an instance of Foo
column.DisplayMember = "SomeNameField"; //Foo.SomeNameField contains a description of the instance

我错过了什么吗?是否可以将数据绑定到复杂对象?

Am i missing something? is it possible to databind to a complex object?

更新:

我实现了一个 TypeConverter 并覆盖了 CanConvertFrom、CanConvertTo、ConvertTo、ConvertFrom.现在我得到了

I implemented a TypeConverter and overrided CanConvertFrom, CanConvertTo, ConvertTo, ConvertFrom. Now i'm getting

FormatException: DataGridViewComboBoxCell 值无效

FormatException: The DataGridViewComboBoxCell value is not valid

有什么想法吗?

推荐答案

您遗漏了一个可能的部分.

You are missing a possible piece.

column.DataPropertyName = "Foo";
column.DisplayMember = "SomeNameField"; 
column.ValueMember = "Bar"; // must do this, empty string causes it to be 
                            // of type string, basically the display value
                            // probably a bug in .NET
column.DataSource = from foo in Foo select foo;
grid.DataSource = data;

更新:

实际上，在再次阅读您的问题后，我认为您正面临着该错误.不幸的是，如果不使用自定义 TypeDescriptor/TypeConverter/BindingSource，则无法使其返回绑定对象.

Actually, after reading your question again, I think you are facing that noted bug. There is unfortunately no way to make it return the bound object without using a custom TypeDescriptor/TypeConverter/BindingSource.

绑定到复杂对象的答案.默认没有.我为我当前的项目写了一篇很好的文章.这涉及制作一个返回所有嵌套属性的自定义 TypeDescriptor/TypeConverter/BindingSource.另一个错误"，您不能使用."对于成员分隔符，我不得不求助于:".

Answer for binding to a complex object. No by default. I wrote quite a nice one for my current project. This involves making a custom TypeDescriptor/TypeConverter/BindingSource that returns all the nested properties. Another 'bug', you cant use '.' for a member separator, I had to resort to ':' instead.

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