.NET 4.0中WPF Datagrid的怪异行为

Question

Problem description: I have a small WPF window using Datagrid bound to an observable collection. When this window is launched in Windows OS having .net 4.5 then it works fine, but when I run in an OS where I have installed only .Net 4.0 (Example: Windows Server 2008R2) then this window crashes with the following exception.

Or here: http://i.imgur.com/AxG9t5p.png

The same window works fine if I install .net 4.5 even though my application is based on .net 4.0 and I am not using any feature specific to .net 4.5.

It would be great if someone could explain why different behaviour ?

Project can be found here: http://1drv.ms/1k9Yolx Thanks

Answer 1

I've tried to run your project at .Net4.5 and .Net 4.0 and I've not met any errors.

You've caught ArgumentOutOfRangeException and this Exception is not related with platform .Net4.0 and .Net 4.5. Moreover, there is ArgumentOutOfRangeException in both .Net4.0 and .Net 4.5.

The code var t = Projects.ColumnFromDisplayIndex(2) gets the DataGridColumn at the specified index. As you have 9 Columns(_name, ..., _path), you do nit catch any exception. However, if you set to 10 like this Projects.ColumnFromDisplayIndex(10) , you will catch an ArgumentOutOfRangeException as you are out of range(you have 9 columns, but you try to get no existed column ).